KR100658967B1 - Arc extinguishing device and switch including arc extinguishing device - Google Patents

Abstract

It improves the arc extinguishing performance and provides an arc extinguishing device which can extinguish arcs not only in the high current region but also in the low current region.

The magnetic plates 110 having the magnetic plate passages 111a and 111b and the extinguishing members 120 having the arc extinguishing member passages 121a and 121b are alternately arranged at predetermined intervals in the moving direction of the movable electrode. When the circuit is opened, the movable electrodes pass through the magnetic plate passages 111a and 111b and the arc extinguishing member passages 121a and 121b sequentially. Then, fine grooves 112a and 112b are formed in the bare corners of the magnetic plate passages 111a and 111b. At the opening of the circuit, the arc is sucked into the narrow grooves 112a and 112b (fixed). In particular, by confining the arc of the low current region in the arc extinguishing device 100, the contact time between the arc and the arc extinguishing gas generated from the arc extinguishing member 120 is ensured. As a result, the arc of the small current region can also be extinguished quickly.

Extinguishing device, switchgear, arc

Description

SOHO device and switchgear with same {ARC EXTINGUISHING DEVICE AND SWITCH INCLUDING ARC EXTINGUISHING DEVICE}

1 is a sectional front view of a switch in the first embodiment.

2 is a plan view of the arc extinguishing device in the first embodiment;

3 is a front view of the arc extinguishing device in the first embodiment;

4 is an exploded perspective view of the arc extinguishing device in the first embodiment;

5 is an exploded perspective view of the arc extinguishing device in the first embodiment;

FIG. 6 is a view of the arc extinguishing apparatus in the first embodiment, taken along the arrow of line 1-1. FIG.

7 is a plan view of a magnetic plate according to the first embodiment;

8A is a bottom view of the arc extinguishing member in the first embodiment;

FIG. 8B is a cross-sectional view taken along the line 2-2 in FIG. 8A

9 is a plan view of a magnetic plate according to the first embodiment;

10 is a perspective view of the arc extinguishing device in the second embodiment;

11 is a perspective view of the arc extinguishing device in the second embodiment;

12 is an exploded perspective view of the arc extinguishing device in the second embodiment;

13 is a plan view of the arc extinguishing device in the second embodiment;

14 is a perspective view of an arc extruding apparatus in another embodiment;

15 is a front view of the arc extinguishing device in another embodiment;

16 is a plan view of the arc extinguishing device in another embodiment;

17 is a front view of the arc extinguishing device in another embodiment;

18 is a plan view of the arc extinguishing device in another embodiment;

19 is a plan view of the arc extinguishing device in another embodiment;

20A is a plan view of the arc extinguishing device in another embodiment.

20B is a cross-sectional view taken along the line 3-3 in FIG. 20A.

21 is a plan view of the arc extinguishing device in another embodiment;

22 is a plan view of principal parts of a magnetic plate in another embodiment;

23 is a bottom view of the arc extinguishing member in another embodiment;

24A is a plan view of an arc extinguishing member in another embodiment;

24B is a cross-sectional view taken along line 4-4 in FIG. 24A.

25 is a sectional front view of a switch in accordance with the third embodiment.

Fig. 26 is a plan view of the arc extinguishing device in the third embodiment.

27 is a front view of the arc extinguishing device in the third embodiment;

28 is a view of the arc extinguishing device in the direction of the arrow A in the third embodiment;

29 is an exploded perspective view of the arc extinguishing device in the third embodiment;

30 is an exploded perspective view of the arc extinguishing device in the third embodiment;

31 is a view from the arrow B direction of the arc extruding apparatus in the third embodiment;

32 is a plan view of a magnetic plate in a third embodiment;

33 is a bottom view of the arc extinguishing member in the third embodiment;

34A is a cross-sectional view taken along the line 1-1 of FIG. 33.

FIG. 34B is a cross-sectional view taken along the line 2-2 of FIG. 33

35 is an enlarged view of a portion C in FIG. 27.

36 is a cross-sectional view taken along line 3-3 in FIG. 33.

37 is a front view of a drive link in a third embodiment

38 is a side view of a drive link in a third embodiment;

FIG. 39 is a bottom view of a main body of the arc extinguishing member in the third embodiment; FIG.

40 is a sectional view of the main portion of the extinguishing device according to another embodiment;

<Description of the symbols for the main parts of the drawings>

11: switchgear 12: body case

12a, 12b: side wall 13: power side bushing

14: load side bushing 15: fixed electrode

18, 21, 73, 74, 75, 78: movable electrode

18a, 18b, 21a, 21b: contact blade

24: drive link 30, 100, 100A: extinguishing device

33: blower member 40, 110: magnetic plate (grid)

41a, 41b, 111a, 111b: magnetic plate path

42a, 42b, 112a, 112b: electron restraint and incision

50, 120: extinguishing member

51a, 51b, 76b, 121a, 121b: SOHO passage

52a, 52b: communication groove 53a, 53b: horizontal groove constituting the pressure chamber

70a, 123: wall member (arc contact wall)

122a, 122b: corner groove (incision corner groove)

123b: opening 122e, 128b: inclined surface

124: gap retaining member

125: main portion constituting the creepage distance increase structure

126: diffusion protrusion 127: protrusion

140: engaging projection 130: support member

131: donation 132: support

134: support hole for extinguishing member 135: insulating wall

141: side departure preventing projections constituting the separation prevention means

142: upper departure preventing protrusions constituting the separation prevention means

150: arc fixing part

151: a slit wall constituting the slit extinguishing means

324a: arc stop wall d1: magnetic plate thickness

d2: thickness of extinguishing member d3: arrangement interval of extinguishing member

D1: Width of magnetic plate path D2: Width of fine groove

I: arc

W: Narrow part which constitutes movement restraint structure

W1: Width of sub-member passageway W2: Width of fine groove

α: movable electrode passing portion β: arc inducing portion

γ: arc restraint

The present invention relates to an arc extinguishing device for extinguishing an arc generated between a fixed electrode and a movable electrode when opening a circuit, and a switch having the same.

As this kind of extinguishing apparatus, for example, the structure described in Japanese Patent Application Laid-Open No. 6-77417 (hereinafter referred to as "Patent Document 1") and Japanese Patent Application Laid-Open No. 63-84822 (hereinafter referred to as "Patent Document 2"). This is known.

In the extinguishing device described in Patent Document 1, a plurality of grids (magnetic materials) having recesses for arc suction are attached to a plurality of cut portions formed on the back side of a U-shaped block insulator (anti-fogging material), respectively. Part of the grid is exposed in a thin groove formed in the center of the inner surface of the insulator. When the circuit is opened, magnetic flux distribution inclined to one side occurs due to the presence of the grid around the arc pillar, and the arc is driven toward the corner of the cutout of the grid. For this reason, the arc is stretched and divided by each magnetic material, so that the cathode drop voltage is increased. In addition, the arc cooling is promoted by the pyrolysis gas generated in the insulator by the arc heat. As a result, the arc voltage is rapidly increased to complete the extinguishing.

On the other hand, the extinguishing device described in Patent Document 2 has a plurality of grid plates (magnetic plates) having arc cutting parts and stacked at predetermined intervals, and insulating plates (armor materials) sandwiched at predetermined intervals between the magnetic plates as holding parts. It is a supporting structure. Upon opening the circuit, the arc is driven toward the corner of the cut portion of the magnetic plate. The arc is divided by each magnetic plate, thereby increasing the cathodic drop voltage of the arc. In addition, the arc is cooled by conducting the arc heat to the grid plate. Cooling of this arc is further promoted by the pyrolysis gas generated in the insulation plate by the arc heat. As a result, the arc voltage is increased to complete the extinguishing.

However, in the conventional grid dust extinguishing device, for example, in the high-voltage AC load switch of 3.6 / 7.2 kV or more, blocking a small current of several tens of amperes (amps) or less such as an excitation current and a charging current, that is, magnetic arc protection (with arc heat). It was difficult to extinguish by). This is because the electromagnetic force generated in each grid due to the energy shortage of the arc current is weak, and the arc cannot be actively brought into contact with the arc extinguishing material (the insulator and the insulating plate). In addition, a small amount of heat generated at the time of opening the circuit due to energy shortage and a small amount of the extinguishing cracked gas are also caused.

Further, in the arc extinguishing device, it is desired to secure the breaking performance in a wide range from the large current range to the small current range, and in particular, the electromagnetic force generated in the magnetic plate is greatly involved in the breaking performance. For this reason, it is desirable to secure an efficient and stable electromagnetic force, and to further shorten the interruption time in an arc, particularly in a small current range of 5 amps or less, in a low current range of 30 amps or less, such as an excitation current and a charging current.                         

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object thereof is to provide an arc extinguishing device capable of extinguishing arcing in a large current region as well as a small current region by improving the arc extruding performance.

Furthermore, an object of the present invention is to significantly reduce the interruption time for arcs in the microcurrent range, to secure the generation of stable electromagnetic force over a wide range from the large current range to the small current range, and to stably improve the breaking performance. It is to provide a fire extinguishing device and a switch having the same.

The invention according to claim 1 is formed of a magnetic plate formed of a magnetic material and having a magnetic plate passage so as to pass through the movable electrode, and a synthetic resin material which is insulative and generates arc extinguishing gas by contact with an arc. Arranging the extinguishing member having the extinguishing member passage in the direction of movement of the movable electrode so as to pass through, and allowing the movable electrode away from the fixed electrode to sequentially pass through the magnetic plate passage and the extinguishing member passage during circuit opening. An arc extinguishing device comprising: a movable electrode passage portion configured to allow a movable electrode to pass from each of the magnetic plate passages and each of the extinguishing member passages, and a cutout groove having a width smaller than that of the magnetic plate passage in the bare corner of the grid passage. An arc induction part for inducing an arc generated between the fixed electrode and the movable electrode at the time of opening the circuit from each of the cutout grooves. An arc constraining portion is provided on an extension line of the arc inducing portion, and an incidence corner groove having a width smaller than that of the arcing member passage is formed in the bare corner of the arcing member passage. In each of the incision corner grooves, an arc guide portion and an arc restraint portion of each magnetic plate are to be exposed.

According to the invention of claim 2, in the invention of claim 1, a creepage distance increasing structure for securing a creepage distance on the side of the arcing member facing each other is provided. .

In the invention according to claim 3, in the arc extinguishing device according to claim 1 or 2, the gutter opening of the arc extruding member is opened to the corner of the arc extinguishing member.

According to a fourth aspect of the present invention, in the arc extinguishing device according to claim 3, the arc extinguishing member is provided with a gap retaining member for maintaining a constant spacing between the magnetic plates, and the creepage distance increasing structure faces each other in the path of the arc extinguishing member. It is a recess formed at the edge of the wall member and the arcing member formed along the path of the arcing member at the edge of the beam, and the gap holding member is formed so that the surface and the backside of the wall member and the arcing member are not in contact with the grid, respectively. The main point is to set the projecting height from the front and rear surfaces of the extinguishing member.

According to a fifth aspect of the present invention, in the arc extinguishing device according to claim 1, the projecting portion projecting from the edge of the magnetic plate is provided at the edge of the arc extinguishing member.

The invention according to Claim 6, in the arc extinguishing device according to claim 1, is characterized in that the magnetic plates are arranged at opposite inner edges of the magnetic plate passages so that at least the portions corresponding to the movable electrodes are parallel to each other when passing through the magnetic plate passages. The point is to form a plate passage.

In the invention according to claim 7, the main purpose of the arc extinguishing device according to claim 1 is to set the width of the cutting groove within a range of 0.5 to 2 mm.

In the invention according to claim 8, in the arc extinguishing device according to claim 1, the width of the cutting groove is set to 1.5 mm or less.

The invention according to claim 9 is, in the arc extinguishing device according to claim 1, the pressure chamber for retaining the extinguishing decomposition gas is formed in the far corner of the extinguishing member passage.

In the invention according to claim 10, in the arc extinguishing device according to claim 9, a plurality of pressure chambers are provided.

The invention according to claim 11 is to provide a movement inhibiting structure for suppressing the movement of the extinguishing cracked gas toward the opening of the extinguishing member in the arc extinguishing apparatus according to claim 1 in the middle of the extinguishing member passage.

In the arc extinguishing device of claim 1, in the arc extinguishing device according to claim 1, when the thickness of the magnetic plate is d1, the thickness of the extinguishing member is d2, and the arrangement interval of the extinguishing member is d3, the extinguishing member is formed such that d1 <d3 <d2. It is a summary to form and arrange a magnetic plate.

13. In the invention according to claim 13, the switch is rotatable in a pair of bushings which are supported so as to correspond to the inner wall of the main body case for each phase, a fixed electrode provided at the inner end of one bushing, and an inner end of the other bushing. The present invention is provided with a movable electrode which is installed in such a manner as to be capable of contacting and detaching with respect to the fixed electrode, and an arc extinguishing device according to claim 1 provided at an inner end of the one bushing.

The invention according to claim 14 is formed of a magnetic plate having a magnetic plate and formed of a magnetic material so as to pass through the movable electrode, and a synthetic resin material which is insulative and generates arc extinguishing gas by contacting the arc and can pass through the movable electrode. An arc extinguishing member having an arc extinguishing member passage is alternately arranged in a moving direction of the movable electrode, and the movable electrode away from the fixed electrode passes through the magnetic plate passage and the arc extinguishing member passage sequentially when the circuit is opened. An arc induction part is formed in the bare corner of the magnetic plate passage by forming a cutout smaller than the magnetic plate passage, and an arc restraint portion is installed in the bare corner of the arc induction portion to fix the arc guided by the arc induction portion. And an arc stop wall orthogonal to the extinguishing member passage is formed in the far corner of the extinguishing member passageway. A cutout groove is formed in the center of the wall and toward the corner and parallel to the cutout groove, and a portion of the magnetic plate is formed in the cutout groove and the arcing member at the bare corner of the cutout groove and around the arc stop wall. The main idea is to expose the passageway and to open the extinguishing member passageway or incision corner groove laterally.

According to a fifteenth aspect of the present invention, in the arc extruding apparatus according to claim 1 or 14, the magnetic body is formed of a ferritic stainless steel containing 9.0 to 16.0 wt% of chromium and 0.006 to 0.020 wt% of carbon. Shall be.

The invention according to claim 16 is the arc extinguishing device according to claim 1 or 14, wherein the magnetic plate and the extinguishing member are supported between a pair of support members, and the two support members are provided on the opening side of the movable electrode passageway. Let's make a point.

According to a seventeenth aspect of the present invention, there is provided an arc extinguishing device according to claim 16, wherein the support member includes a base fixed to a fixed electrode and a support part for supporting the magnetic plate and the arc extinguishing member, and a lower extremity arcing member on an upper surface of the base. The point is to make close.

According to a seventeenth aspect of the present invention, in the arc extinguishing device according to claim 16, a single or plural insulating walls are formed on an inner surface of the base, and the insulating wall and the lowermost arcing member are overlapped.

The invention according to claim 19 is the arc extinguishing device according to claim 16, wherein the side of the arcing member is provided with an attachment engaging projection, and the arc is inserted into the support hole for the arcing member formed in the support member from the inside. The member is to be supported between the two supporting members, and the disengagement preventing means is provided at the distal end of the engaging projection.

According to an aspect of the present invention, there is provided a microscopic arc extinguishing means provided in the peripheral edge of the extinguishing member passage in the lower extremity extinguishing member in the extinguishing apparatus according to claim 1 or 14.

In the arc extinguishing device according to claim 1 or 14, in the arc extinguishing device according to claim 1 or 14, a space keeping means for holding a magnetic plate and a space between upper and lower positions of the arc extinguishing member is provided on the side of the arc extinguishing member, It is a main point to cover the inner surface of the base of said support member by a spacing means in the extinguishing member.

22. The invention according to the present invention is provided with a power side bushing and a load side bushing which are penetrated to face each side wall of the main body case, a fixed electrode provided at an inner end of the power side bushing, and a rotatable inner end of the load side bushing. In the switchgear having a movable electrode corresponding to detachable contact with the fixed electrode, an arc extinguishing device according to claim 14 is installed at an inner end of the power side bushing, and a driving link is operatively connected to the movable electrode. A movable electrode passing portion configured to allow the movable electrode to come out of contact with the fixed electrode by driving of the movable electrode, and to allow the movable electrode to pass through the magnetic plate passage and each of the extinguishing member passages, and the movable electrode of the drive link. The passage part or the movable electrode itself is provided with an arc generated between the movable electrode and the fixed electrode when the circuit is opened. And the one to install the air blowing member for inserting into the electrode passage in a base portion.

The invention of claim 23 is directed to a switch according to claim 22, wherein the blower member and the drive link are integrally formed.

24. The invention described in claim 24, wherein a plurality of magnetic plates made of magnetic material are arranged at regular intervals, and at the same time, a magnetic plate comprising a magnetic plate constituting a movable electrode passage portion through which movable electrodes pass in the direction perpendicular to the same magnetic plates. In this regard, the magnetic body is made of a ferritic stainless steel containing 9.0 to 16.0% by weight of chromium (Cr) and 0.006 to 0.020% by weight of carbon (C).

25. An invention according to claim 25, wherein a plurality of magnetic plates made of magnetic material are arranged at regular intervals, and at the same time, a magnetic plate comprising a magnetic plate constituting a movable electrode passage portion through which movable electrodes pass in a direction orthogonal to them. In the above, the magnetic substance is intended to select a low carbon content (0.006 to 0.020% by weight) representative composition.

According to the invention of claim 1, the arc accompanying a small current of tens of amperes or less generated between the fixed electrode and the movable electrode at the time of opening the circuit is led to the corner of each grid by the arc induction part, It is fixed. The generation of the extinguishing cracked gas is actively promoted, and the extinguishing cracking gas is extinguished.

According to the invention of claim 2, furthermore, the creepage distance is secured from the side of the extinguishing member.

According to the invention of claim 3, furthermore, the extinguishing cracking gas generated by the contact of the arc extinguishing member and the arc is led backward through the extinguishing element passage and the cutout groove.

According to the invention of claim 4, furthermore, the arrangement intervals of the magnetic plates are held constant by the space keeping member of the arc extinguishing member. In addition, creepage distances are secured from the sides of the extinguishing member by the recesses formed by the wall member and the surface of the extinguishing member and the rear surface and the spacing retaining member formed along the path of the extinguishing member at opposite edges of the arcing member passage. Since the front and back surfaces of the wall member and the arc extinguishing member do not contact the magnetic plate, respectively, it is easy to secure the creepage distance.

According to the invention of claim 5, the generation of arc is further suppressed between the edges of the magnetic plates.

According to the invention of claim 6, the arc is driven toward the corner of the magnetic plate without contacting the arc extinguishing member. The magnetic force generated between these regions becomes equal because at least two portions corresponding to the movable electrodes are parallel to each other at least at the opposite inner edges of the magnetic plate passages. Because of this, the arc is stable and driven towards the corner of the magnetic plate passage. The arc extinguishing is accelerated by the arc extinguishing gas generated in the arc extinguishing element.

According to invention of Claim 7, the width | variety of a cutout groove is set in the range of 0.5-2 mm. For this reason, the electromagnetic attraction force is secured from the cut groove toward the corner of the magnetic plate, and the movement of the arc toward the opening of the magnetic plate is suppressed.

According to the invention of claim 8, furthermore, since the width of the cutout groove of the magnetic plate is 1.5 mm or less, the electromagnetic force toward the corner of the magnetic plate is secured.

According to the invention of claim 9, the extinguishing cracked gas generated by arc heat stays in the pressure chamber, whereby the extinguishing cracked gas pressure in the pressure chamber is increased.

According to the invention of claim 11, the movement of the extinguishing cracked gas from the extinguishing member toward the opening is suppressed. As a result, the extinguishing cracked gas stays in the corner of the extinguishing member passage rather than the movement suppressing structure, and the extinguishing cracking gas pressure is increased in the corner.

According to the invention described in claim 12, the thickness of the arc extinguishing member is secured for a certain level or more. By arranging the plurality of arc-extinguishing members at predetermined intervals, the microscopic effect is obtained when the movable electrode passes through the passages of the arc-extinguishing members sequentially, thereby facilitating arc extinguishing.

According to the invention of claim 14, a portion of the magnetic plate is exposed into the arc member passage around the arc stop wall. As a result, a small current reverse arc (microcurrent arc) of 5 amps or less generated between the fixed electrode and the movable electrode at the time of opening the circuit is induced to the corner of each magnetic plate passage by the centrifugal force and the arc induction part which follows the opening operation of the movable electrode. And it is fixed in the state short-circuited between the exposed parts of each magnetic plate provided around each arc stop wall. This ensures sufficient contact time between the arc and the extinguishing member. And generation | occurrence | production of an arc extinguishing gas in an arc stop wall is accelerated | stimulated, and it is stabilized. The cutout groove of the extinguishing member is opened to the side of the extinguishing member. Thus, the arc extinguishing crack gas is smoothly discharged laterally around the arc stop wall and fresh arc extinguishing crack gas is always supplied around the arc stop wall.

According to the invention of claim 15, the magnetic plate is made of a ferritic stainless steel containing 9.0 to 16.0 wt% chromium and 0.006 to 0.020 wt% carbon. As a result, an antirust effect is obtained. Moreover, even if it becomes high temperature by annealing etc., the stable ferrite single phase structure is obtained and the magnetic property of a magnetic plate improves.

According to the invention of claim 22, the arc issued between the fixed electrode and the movable electrode according to the opening operation of the movable electrode by driving the drive link is generated by the wind pressure generated by the movement of the blower member installed in the drive link or the movable electrode itself. As a result, in the arc extruding apparatus according to claim 14, the induction is promoted toward the corner of the movable electrode passage portion.

(First embodiment)

EMBODIMENT OF THE INVENTION Hereinafter, 1st Embodiment which actualized this invention by the arc extinguishing device of a switchgear is demonstrated according to FIG.

As shown in Fig. 1, on both side walls of the main body case 12 of the switch 11, the power side bushing 13 and the load side bushing 14 are for each phase of each of three phases (only one phase in Fig. 1). It is penetrated and supported to face each other. A rod-shaped fixed electrode 15 protrudes from an inner end side of the power source side bushing 13, and an inner arc metal 15a is fixed to an upper end of the fixed electrode 15. A conductive rod 16 protrudes from an inner end of the load side bushing 14, and the base end of the movable electrode 18 is rotatably supported by the conductive rod 16 via the shaft 17. As shown by the dashed-dotted line in Fig. 2, the movable electrode 18 is provided with a pair of contact blades 18a and 18b in the form of a parallel plate. In this embodiment, the thickness of the contact blades 18a and 18b is 4 mm, respectively.

On the other hand, as shown in Figure 1, the lower part in the main body case 12, through the link mechanism (not shown) consisting of a plurality of links, etc., the rotating shaft is operatively connected to the operation handle (not shown) outside the main body case 12 19 is provided, and the lever 20 is fixed to the rotation shaft 19 so as to be integrally rotatable. One end of the drive link 24 is rotatably connected to the tip of the lever 20, and the other end of the drive link 24 is rotatably connected near the center of the movable electrode 18. Thus, when the operation handle is operated, the movable electrode 18 is put in the solid line in FIG. 1 about the shaft 17 via the link mechanism, the pivot shaft 19, the lever 20, and the drive link 24. Move between the position and the open position shown by the dashed-dotted line.

(Social device)

As shown in FIG. 1, the extinguishing device 100 is fixed to the inner end of the power source side bushing 13 via a fixing metal body 318. 3 to 5, the arc extinguishing device 100 has a plurality of arcs formed in a plate shape by a plurality of grids (magnetic plates) 110 formed in a plate shape by a magnetic material and a synthetic resin material having insulation and extinction. The members 120 are alternately arranged with a predetermined gap in the moving direction of the movable electrode 18. As shown in FIGS. 4 to 6, the magnetic plates 110 and the arc extinguishing members 120 are disposed between the pair of supporting members 130 and are collectively supported.

(Support member)

As shown in FIGS. 3 to 6, the support member 130 is integrally formed by an insulating synthetic resin material or an inorganic material, and the base 131 and the base 131 are fixed to the fixed electrode 15. The support part 132 formed inclined with respect to () is provided. In the support portion 132, a plurality of sets of magnetic plate support holes 133 (two sets in this embodiment) are formed at predetermined intervals in the longitudinal direction of the support portion 132. In the support portion 132, support holes 134 for arc extinguishing members are formed between the pairs of the magnetic plate support holes 133, respectively.

(Magnetic Edition)

As shown in FIG. 7, the magnetic plate 110 is formed in a W-shaped plate by a magnetic material (magnetic mild steel in this embodiment). A pair of magnetic plate passages 111a and 111b are formed at predetermined intervals on the front edge (the edge on the load side bushing 14 side) of the magnetic plate 110 so as to be able to pass through the contact blades 18a and 18b, respectively. At the inner edges of the magnetic plate passages 111a and 111b facing each other, the magnetic portions are arranged so that the portions corresponding to the contact blades 18a and 18b are parallel to each other when passing through the magnetic plate passages 111a and 111b, respectively. Plate passages 111a and 111b are formed. It is preferable to make the width D1 of the magnetic plate passages 111a and 111b as narrow as possible from the viewpoint of increasing the electromagnetic force suction generated in the magnetic plate 110. In the present embodiment, the thicknesses of the contact blades 18a and 18b ( It is 8mm slightly wider than 4mm).

Thin grooves 112a and 112b as cutouts are formed in the bare corners of the magnetic plate passages 111a and 111b, respectively. The width D2 of the thin grooves 112a and 112b is smaller than the width D1 of the magnetic plate passages 111a and 111b, and is 0.5 mm in this embodiment. The thin grooves 112a and 112b are formed in the same direction as the magnetic plate passages 111a and 111b so as to have a predetermined length L (L = 10 mm in this embodiment) (ie, the rear end of the magnetic plate 110). Edge). The width D2 of these thin grooves 112a and 112b will be described in detail below. In addition, a pair of protrusions 113 and 113 are formed at the front ends of both edges of the magnetic plate 110, and both of the protrusions 113 and 113 are formed in the magnetic plate support holes 133 of both support members 130. Each is engaged inward.

(Soho member)

As shown in Figs. 2 and 4, the extinguishing member 120 has an insulating property, and generates a extinguishing decomposition gas by arc heat (for example, tetrafluoroethylene perfluoro vinyl ether copolymer (PFA) Fluorine resins) are formed in a W-shaped plate shape. Therefore, the extinguishing member 120 generates the extinguishing decomposition gas by contact with the arc.

A pair of extinguishing member passages 121a and 121b are formed at the front end edges of the extinguishing member 120 (edges on the side of the load side bushing 14) so as to allow the contact blades 18a and 18b to pass through, respectively. . The shape of the extinguishing member passages 121a and 121b substantially coincides with the magnetic plate passages 111a and 111b (see Fig. 2).

Corner grooves 122a and 122b as incision corner grooves are formed in the bare corners of both the arc-like member passages 121a and 121b, respectively. The corner grooves 122a and 122b extend inwardly (that is, the trailing edge side of the extinguishing member 120) in the same direction as the extinguishing member passages 121a and 121b.

The width of the corner grooves 122a and 122b is smaller than the width of the arc extinguishing member passages 121a and 121b.

The extinguishing device 100 is stacked between the extinguishing member 120 and the magnetic plate 110 in a state in which the extinguishing member 120 and the magnetic plate 110 are alternately disposed between the supporting members 130 and 130. In the plan view viewed from the direction (see FIG. 3), the positional relationship between the corner grooves 122a and 122b and the thin grooves 122a and 122b is as follows. That is, as shown in FIG. 2, the entirety of the thin grooves 122a and 122b is located in the corner grooves 122a and 122b.

As shown in FIGS. 4 and 6, the wall members 123 protrude toward the rear surface of the extinguishing member 120 at inner edges of the extinguishing member passages 121a and 121b and the corner grooves 122a and 122b that face each other. It is formed so that it may not be shown in FIG. The inner surface of the wall member 123 protruding to the rear surface of the extinguishing member 120 forms a continuous flat surface 123a. The wall member 123 (strictly, the flat surface 123a of the wall member 123) functions as an arc contact member which comes into contact with this large current arc and generates an arc extinguishing gas at the time of large current opening or the like.

In addition, between the two wall members 123 positioned on the outermost side of each wall member 123 and the outer edge of the extinguishing member 120, the gap retaining member 124 is a surface of the extinguishing member 120 and It is formed to protrude to the back side. The gap retaining member 124 is in contact with the magnetic plates 110 when the arcing member 120 and the magnetic plate 110 are alternately stacked between the supporting members 130 and 130. The arrangement interval of each magnetic plate 110 is kept constant.

Further, the protruding length from the back surface of the arc extinguishing member 120 of the spacer member 124 is larger than the protruding length from the back surface of the arc extinguishing member 120 of the wall member 123. Accordingly, when the spacer member 124 alternately stacks the extinguishing member 120 and the magnetic plate 110 between the supporting members 130 and 134, the wall member 123 and the extinguishing member 120. The front surface and the back surface of) do not contact the magnetic plate 110, respectively. Then, a predetermined gap is formed between the wall member 123, the surface and the rear surface of the arc extinguishing member 120, and the magnetic plate 110. In other words, the protruding height from the surface and the back surface of the arc-holder member 120 of the spacer member 124 so that the front and rear surfaces of the wall member 123 and the arc-out member 120 do not contact the magnetic plate 110, respectively. Is set.

As shown in FIGS. 3 and 6, the gap retaining member 124 may be disposed on both sides of the arc extinguishing member 120 when the arc extinguishing member 120 and the magnetic plate 110 are alternately disposed. In the left and right), an insulating barrier for insulating between the magnetic plates 110 is also used. In addition, the gap retaining member 124 is a gap that is opened in the front and rear respectively by closing both sides between the arc extinguishing member 120, when the extinguishing member 120 and the magnetic plate 110 are alternately arranged. S) (see FIG. 6) is formed.

Recesses 125 are formed on the front and rear surfaces of the arc extinguishing member 120 by the wall member 123, the gap retaining member 124, and the front or back surfaces of the arc extinguishing member 120. As a result, the creepage distance is increased in the side of the arc extinguishing member 120 (direction perpendicular to the longitudinal direction of the arc extinguishing member passages 121a and 121b).

As illustrated in FIG. 2, protrusions 127 are formed at rear ends of both edges of the extinguishing member 120. The extinguishing member 120 is supported between the supporting portions 132 of the supporting member 130 such that the protrusions 127 protrude from both edges of the magnetic plate 110, respectively. By this protrusion 127, the creepage distance of the side part in the extinguishing device 100 is secured.

Coupling protrusions 140 are formed at the front end sides at both edges of the extinguishing member 120. The protrusion 127 and the engaging protrusion 140 are each formed such that the outer edge thereof is located on the same plane. Both coupling protrusions 140 and 140 are respectively coupled to the support hole 134 for the extinguishing member of both the supporting members 130 and 130 from the inside.

In addition, the arc extinguishing member 120 will be described. The corner grooves 122a and 122b are opened behind the arc extinguishing device 100 via the voids 122c and 122d. Protrusions 122g and 122h are formed at the rear end side of the wall member 123. As shown in FIG. 8B, a protrusion 122f is formed on the rear end side of the wall member 123 on the upper and lower barrier surfaces 122j. The protrusion 122f is formed to have a smaller thickness as it goes to the rear end side of the extinguishing member 120. The surface of the protrusion 122f and the upper and lower barrier surfaces 122j are connected by a tapered surface 122e. Such a configuration makes it possible to cope with wear caused by the arc and to smoothly discharge the extinguishing decomposition gas.

In addition, as shown in Figure 2, by installing so that the upper and lower barrier surface 122j protrudes a lot from the rear edge of the magnetic plate 110, it is possible to smoothly extinguish the extinguishing decomposition gas at the rear of the arc extinguishing device 100. In addition, the atmosphere between the magnetic plates 110 can be prevented from being shorted by the return of the extinguishing decomposition gas. In the case where the portion (the range indicated by ε in FIG. 2) protruding to the rear of the upper and lower barrier surfaces 122j is close to the rear of the arc extinguishing device 100 and there is no member which prevents the release of the extinguishing decomposition gas, the magnetic It may be omitted to the extent that the trailing edge of the plate 110 is covered. In other words, the rear end edge of the magnetic plate 110 and the rear end edge of the upper and lower barrier surfaces 122j may be disposed in the same plane.

(Length of fine groove)

Next, the width D2 of the thin grooves 112a and 112b in the magnetic plate 110 will be described.

In order to determine the width D2 of the fine grooves 112a and 112b, the magnetic plate 110 is formed of magnetic stainless steel and magnetic mild steel, and the width D2 of the fine grooves 112a and 112b is defined for each. Alternately, a breaking test of small currents (excitation current and charging current described below; conforming to Japanese Industrial Standard 4605) was performed. The results are shown in Table 1 and Table 2.

Grid material Current value (A) Magnetic Stainless Steel 5 10 15 20 30 Width D2 of Grinding Groove 0.3 O O O O O 0.5 X O O O O 0.8 X X O O O 1.2 X X X O O 1.5 X X X X O 1.8 X X X X X

Table showing the relationship between the width of the thin grooves and the restriction of small currents (according to JIS 4605).

(O: Good Redemption, X: Non Redemption)

Grid material Current value (A) Magnetic wrought iron 5 10 15 20 30 Width D2 of Grinding Groove 0.3 O O O O O 0.5 O O O O O 0.8 X O O O O 1.2 X X O O O 1.5 X X X O O 1.8 X X X X O 2 X X X X X

Table showing the relationship between the width of the thin grooves and the restriction of small currents (according to JIS 4605).

(O: Good Redemption, X: Non Redemption)

The test conditions are as follows. In other words, the test electrode structure was a rod-shaped electrode (fixed electrode 15). The movable electrode was a narrow contact type by two copper straight blades (contact blades 18a and 18b), and the thickness of the contact blades 18a and 18b was 4 mm. As for the extinguishing device 100, seven magnetic plates 110 and eight extinguishing members 120 were alternately stacked. The thickness of the magnetic plate 110 was 1 mm, and the height of the extinguishing member 120 was 6.5 mm.

In addition, the load switch (3.6 / 7.2 V) for high-voltage alternating current requires the rating and performance shown in Table 3 (according to Japanese Industrial Standard JIS 4605). For example, in the case of rated current 600A (amps), it is required to be able to cut off the load current 600A 200 times, the exciting current 30A, and the charging current 10A 10 times, respectively. In the present embodiment, the load current is referred to as a small current, which is a large current (current value exceeding 30 A in the present embodiment), an excitation current, and a charging current of more than 5 A and 30 A or less. In addition, the current value of less than 5A among an exciting current and a charging current is called a microcurrent.

Rated Load Switching Capacity (A) Rated Current (A) Load current Excitation current Charging current 600 600 30 10 400 400 20 10 300 300 15 10 200 200 10 10 100 100 2 10 Operation 200 times 10th 10th

Rated and performance required for high pressure load switch (3.6 / 7.2kV)

From the test results shown in Table 1, when the material of the magnetic plate 110 is made of magnetic stainless steel, the range that can be adopted as the width D2 of the fine grooves 112a and 112b is more than 0 and 1.5 mm or less. do. Further, if the width D2 of the thin grooves 112a and 112b is 0.3 mm or less, the arc can be cut off for the entire test current range (see Table 3) of the Japanese Industrial Standard (JIS). In other words, the arc may be confined to the thin grooves 112a and 112b of the magnetic plate 110. This is because the smaller the width D2 of the thin grooves 112a and 112b, the stronger the electron attraction force into the thin grooves 112a and 112b.

From the test results shown in Table 2, when the material of the magnetic plate 110 is made of magnetic soft iron, the width D2 of the fine grooves 112a and 112b is preferably more than 0 and 1.5 mm or less. If this range is exceeded, the electron attraction force inside the fine grooves 112a and 112b generated in the fine grooves 112a and 112b is not sufficiently obtained, and the arc is stabilized and sucked inside the fine grooves 112a and 112b. It becomes difficult to fix. In other words, it becomes difficult to constrain the arc to the fine grooves 112a and 112b of the magnetic plate 110 in the entire test current range of the Japanese Industrial Standard (JIS). The smaller the width D2 of the thin grooves 112a and 112b is, the stronger the magnetic attraction force into the thin grooves 112a and 112b is. However, when the width D2 of the thin grooves 112a and 112b is 0.3 mm or less, It is difficult to form the thin grooves 112a and 112b with respect to the magnetic plate 110 having a thickness of 1 mm. Therefore, there is a fear that the grooves 112a and 112b are closed due to the repetition of the current interruption.

In this embodiment, the magnetic plate 110 is formed of a magnetic stainless steel. This is because magnetic stainless steels are weaker in electron attraction than magnetic soft iron, but are excellent in corrosion resistance. In addition, the width | variety D2 of the thin grooves 112a and 112b was 0.5 mm.

In addition, in this embodiment, the fine groove | channel 112a, 112b comprises the arc guide part mentioned later. The thin grooves 112a and 112b constitute an incision groove. The recessed part 125 constitutes a creepage distance increasing structure.

In addition, the magnetic plate passages 111a and 111b and the arc extinguishing member passages 121a and 121b constitute a movable electrode passage portion α. The inner grooves 122a and 122b of the arc extinguishing member 120 and the thin grooves 112a and 112b of the magnetic plate 110 having a narrower width than the movable electrode passage part α are the arc induction part β having a predetermined length. Configure The exposed portion of the flat plate portions 112c and 112d in the bare corners of the thin grooves 112a and 112b of the magnetic plate 110 in the inner grooves 122a and 122b of the extinguishing member 120 and the inner grooves 122a and 122b. ) Constitutes an arc restraint γ. The pair of gap retaining members 124 and 124 and the surface (upper barrier surface) and the back (lower barrier surface) of the extinguishing member 120 are formed with the inner grooves 122a and 122b of the extinguishing member 120 and the voids 122c and 122d. And the air gap δ opening to the rear of the extinguishing device 100 is configured. Therefore, as shown in FIG. 2, in the arc extinguishing device 100, the movable electrode passage portion α, the arc inducing portion β, the arc constraining portion γ and the void portion δ are the movable electrodes 18, respectively. ) Are arranged in series in this order.

Both sides of the thin grooves 112a and 112b of the magnetic plate 110 constituting the arc inducing portion β have a predetermined width and are disposed to be exposed in the corner grooves 122a and 122b of the extinguishing member 120. This is effective for arcs in the low current region, especially when the electromagnetic force is weak. That is, when the arc is attracted to the bare corners of the fine grooves 112a and 112b by the magnetic flux generated in the fine grooves 112a and 112b of the magnetic plate 110, the arc becomes difficult to contact the arc extinguishing member 120. In addition, generation | occurrence | production of anti-extinguishing decomposition gas in this part is suppressed. For this reason, the increase in internal pressure in the fine grooves 112a and 112b is avoided. For example, an increase in the internal pressure, which becomes the repulsive force, is suppressed even for a driving force in which the electromagnetic force in the small current region is weak. For this reason, operation | movement by the electromagnetic force of an arc is not disturbed, and this arc moves to the arc restraint part (gamma) smoothly.

(Operation of Embodiments)

Next, the action of the extinguishing device of the switch configured as described above will be described.

In the closing state shown by the solid line in FIG. 1, if the operation handle is operated to open the circuit, the lever 20 rotates left via the rotation shaft 19. In conjunction with this, the drive link 24 is moved upwards and the movable electrode 18 is pivoted about the axis 17. If the movable electrode 18 is spaced apart from the fixed electrode 15, an arc I is generated between the positive electrodes 15 and 18, that is, between the fixed electrode 15 and the positive contact blades 18a and 18b, respectively. .

As shown in FIG. 9, magnetic flux distribution biased to one side occurs due to the presence of the magnetic plate 110 around the arc pillar. By the electromagnetic force generated in the magnetic plate 110 based on the right-handed law and the Fleming's left-handed law, the arc I is usually driven inside the magnetic plate 110 (in the direction of the arrow in Fig. 9), It concentrates and fixes to the inside of the groove | channel 112a, 112b which passes through the bare corner of the magnetic plate channel | path 111a, 111b (refer FIG. 2).

As shown in FIG. 2, since the entire magnetic plate passages 111a and 111b are exposed in the arcing member passages 121a and 121b, the arc I does not interfere with the arcing member 120, and the magnetic plate is not exposed. It is smoothly driven to the inside of the 110 (strictly, the fine grooves 112a and 112b).

At the inner edges of the magnetic plate passages 111a and 111b facing each other, at least to the movable electrode 18 (strictly the contact blades 18a and 18b) when passing through the magnetic plate passages 111a and 111b. Since the corresponding portions are parallel to each other, the strength of the electromagnetic force generated between these portions becomes uniform. For this reason, the arc I is stabilized and is driven inward of the magnetic plate passages 111a and 111b.

Since the width D1 of the magnetic plate passages 111a and 111b is very narrow within the range in which the contact blades 18a and 18b do not interfere during opening and closing, for example, at the front edge of the magnetic plate 110. As compared with the case where the contact blades 18a and 18b are made to pass through the formed one cutout portion, the electron attraction force inside the magnetic plate 110 is increased. This is because the electron attraction force becomes stronger as the width D1 of the magnetic plate passages 111a and 111b becomes smaller. That is, the width of the cutout is such that two contact blades 18a and 18b can pass in a batch, and the width D1 of the magnetic plate passages 111a and 111b is one contact blade 18a, respectively. 18b) is enough to pass. For this reason, the magnetic attraction force can be increased. In particular, it is effective at the time of opening a small current of about 5A.

In addition, since the width D2 of the thin grooves 112a and 112b is smaller than the width D1 of the magnetic plate passages 111a and 111b, the magnetic grooves 112a and 112b have the magnetic plate passages 111a and 112b. Stronger electron attraction than 111b) is generated. For this reason, for example, at the time of opening a small current such as an excitation current or a charging current, the fine grooves 112a and 112b constituting the magnetic plate passages 111a and 111b and the arc inducing portion β even if the arc time is long. The excitation current arc and the charging current arc are attracted to the inside of the thin grooves 112a and 112b by the strong electromagnetic force generated in the respectively. Therefore, the thinning grooves 112a and 112b are fixed (restrained) in the arc restraining portion γ located inside, and an arc spot is formed.

When the thin grooves 112a and 112b are not formed, fixed control of small current arcs, such as an excitation current arc and a charging current arc, becomes impossible. That is, due to the lack of energy, the electron attraction force for driving the arc I to the inside of the magnetic plate passages 111a and 111b is weakened, and the arc extinguishing gas pressure in the magnetic plate passages 111a and 111b is increased, thereby increasing the arc I. Is forcibly returned to the front ends of the magnetic plate passages 111a and 111b. For this reason, the stable interruption | blocking operation | movement of an arc cannot be obtained.

In this manner, the arc I is concentrated in the bare corners of the thin grooves 112a and 112b and extended in a fixed state, and is divided by the magnetic plates 110, and the anode, the cathode drop, the cooling, and the like are effectively applied. In operation, the arc voltage is rapidly increased. The arc is stabilized near the center of the arc restraint γ in the magnetic plate 110.

On the other hand, since the magnetic plate 110 and the arc extinguishing member 120 are alternately arranged in the moving direction of the movable electrode 18, the arc I is the upper surface of the upper and lower barrier surfaces 122j of the arc extinguishing member 120. The inner surface of the magnetic plate 110 is further driven while being in contact with the (surface) and the lower surface (lower surface). In this case, an arc extinguishing gas is generated from the upper surface, the lower surface, and the wall member 123 of the upper and lower barrier surfaces 122j of the extinguishing member 120 by arc heat, and the extinguishing is promoted by the extinguishing decomposition gas. This is particularly effective at large current openings above 30A.

That is, the large current arc has a large energy and also has a large magnetic attraction force generated in each magnetic plate 110. For this reason, the arc I is driven inwardly of the grooves 112a and 112b, and further to the rear side of the extinguishing member 120, and actively contacts the upper and lower surfaces of the extinguishing member 120. FIG. In addition, since the amount of heat generated as compared with the microcurrent arc and the small current arc is also large, the amount of anti-corrosive decomposition sag from the upper and lower surfaces of the arc extinguishing member 120 is also sufficiently secured. In addition, the wall member 123 that forms the inner grooves 122a and 122b located in the arc inducing portion β also contributes to the generation of the arc extinguishing gas.

Since the extinguishing member 120 is formed of a synthetic resin (PFA in this embodiment) containing fluorine, which is a kind of negative atom, the extinguishing member 120 has a negative quality of easy to adsorb electrons in the arc to the extinguishing decomposition gas generated by the arc heat. Contains a fluorine atom, a kind of atom. The adsorption performance (current blocking performance) can be increased by the adsorption of electrons in the arc by the fluorine atom.

In addition, when the contact blades 18a and 18b pass through the extinguishing member passages 121a and 121b, the inner surfaces of the extinguishing member passages 121a and 121b are exposed to the arc. Due to the arc heat, the extinguishing cracked gas is generated from the inner surfaces of the extinguishing member passages 121a and 121b, and the extinguishing is promoted by the extinguishing cracked gas. This is particularly effective at the opening of the microcurrent.

That is, compared to the high current arc, the micro current arc has a very small energy, and the magnetic force generated in each magnetic plate 110 is also weak. For this reason, the arc may not be driven to the inside of the fine grooves 112a and 112b. In this case, the amount of extinguishing cracked gas generated from the upper and lower surfaces of the extinguishing member 120 is lower than that of the large current opening. However, the lowering of the amount of heat generated by the arc extinguishing sag at the time of opening the micro current can be compensated by the arc extinguishing decomposition gas generated from the inner surface of the extinguishing member passages 121a and 121b located near the microcurrent arc point. .

In addition, the extinguishing decomposition gas generated from the inner surfaces of the extinguishing member passages 121a and 121b remains in the inner grooves 122a and 122b of the extinguishing member 120. For this reason, the pressure of the extinguishing decomposition gas in the inner grooves 122a and 122b increases. The arc extinguishing is promoted by the contact of the arc (I) of the extinguishing cracked gas having a high pressure. This works effectively when the arc time becomes long when a small current such as an excitation current or a charging current is opened. This is because the exciting current arc and the charging current arc are induced into the inner feet of the thin grooves 112a and 112b by the strong electromagnetic force of the thin grooves 112a and 112b.

That is, in the normal load current, since the current waveform and the voltage waveform are approximately the same period, respectively, the voltage also becomes 0V in the case of the current 0A. For this reason, blocking is easy. However, since the phase of the excitation current is delayed by 90 degrees from the phase of the current, and the charge current is 90 degrees ahead of the phase of the current, the voltage becomes the maximum when the current becomes 0A. Difficult to block By contacting the arc-extinguishing decomposition gas having a high pressure in the inner grooves 122a and 122b of the arc extinguishing member 120 with the exciting current arc or the charging current arc, it is possible to extinguish even at the zero point of the current having the maximum voltage.

Moreover, the widths of the arcing member passages 121a and 121b are very narrow, and the inner surfaces (ie, the flat surface 123a) of the arcing member passages 121a and 121b are both side surfaces of the contact blades 18a and 18b. Are close to each other. For this reason, since both contact blades 18a and 18b pass through each extinguishing member channel | path 121a, 121b sequentially, arc extinguishing is promoted by a slit effect. This is effective when extinguishing the microcurrent arc.

In addition, the magnetic plates 110 and the arc extinguishing member 120 are alternately arranged with a predetermined gap in the moving direction of the movable electrode 18, whereby carbides are continuously formed between the inner surfaces of the arc extinguishing members 120. Attachment is prevented. For this reason, a continuous carbon screen is not formed in the inner surface of the extinguishing member 120, and deterioration of extinguishing performance is suppressed. Moreover, recessed part 125 is formed in the surface and the back surface of the arc extinguishing member 120, respectively, and the creepage distance to the side of this arc extinguishing member 120 is ensured. In addition, the protrusion 127 is formed at the side of the arc extinguishing member 120. For this reason, it is suppressed that the arc I turns to the side of each magnetic plate 110, and generation | occurrence | production of the arc I between both sides of each magnetic plate 110 is prevented.

The extinguishing decomposition gas generated in the extinguishing member passages 121a and 121b is led to the flat surface 123a and is led to the rear of the extinguishing member 120. Particularly in the case of large current opening, the arc extinguishing gas flows mainly behind the magnetic plate 110 and the arc extinguishing member 120 with the generation of the arc I. The arc I is blown to the rear of the magnetic plate 110 and the extinguishing member 120 by this arc extinguishing decomposition gas, and the arc I becomes longer. That is, arcing is promoted by the effect that the arc is blown by the extinguishing decomposition gas flowing to the rear of the magnetic plate 110 and the extinguishing member 120. Moreover, the outer surface (surface opposite to the flat surface 123) of the wall member 123 becomes negative of an arc generation site | part, and metal vapor etc. contained in extinguishing decomposition gas become difficult to adhere | attach. . For this reason, no continuous fouling surface is formed, and the creepage distance between each magnetic plate 110 is ensured.

As indicated by the arrows in FIG. 8A, the extinguishing cracked gas drawn to the rear of the extinguishing member 120 is guided to the rear of the extinguishing device 100 via a largely open gap S (see FIG. 6). In addition, a new atmospheric gas (air) is introduced while the extinguishing cracked gas does not stay and escapes behind the extinguishing member 120. As a result, the insulation resistance of an atmosphere becomes high behind the inner side grooves 122a and 122b of the extinguishing member 120, and contributes to extinguishing. Moreover, the magnetic plate 110 is cooled by the newly introduced atmospheric gas (air), and the extinguishing is accelerated.

First, the extinguishing digestive gas exhibiting the extinguishing performance contains metal vapor or free carbon, which causes re-ignition. However, the extinguishing digesting gas rapidly forms the magnetic plate 110 and the extinguishing member 120. Reinhibition is prevented by being drawn to the rear. If the movable electrode 18 moves to the open position shown by the dashed-dotted line in Fig. 1, the arc is completely extinguished and the circuit opening operation ends. At the time of closing the circuit, the operation is performed in reverse with the above-described opening of the circuit.

(Effect of 1st Embodiment)

(1) In the far corners of the magnetic plate passages 111a and 111b, arcs formed in the far corners of the arc extinguishing device 100 with arcs generated between the fixed electrode 15 and the movable electrodes 18 at the time of opening the circuit. It is assumed that an arc induction part β that leads to negative gamma is provided. Specifically, in the thin grooves 112a and 112b formed to have a predetermined length (10 mm) in the bare corners of the magnetic plate passages 111a and 111b, a strong electromagnetic force is generated even at a small current, and the arc is an arc restraining portion. is induced rapidly into (γ). In particular, by confining the arc I in the small current region in the arc extinguishing device 100, the contact time between the arc I and the arc extinguishing gas generated from the arc extinguishing member 120 is ensured. As a result, the arc I in the small current region can also be rapidly extinguished. Thereby, either arc I of a large current range and a small current range can also be extinguished. In other words, both the high current range and the low current range blocking performance (according to JIS 4605) can be secured.

(2) The creepage distance increasing structure for securing the creepage distance on the side of the extinguishing member 120 is provided at the edge portions of the extinguishing member passages 121a and 121b facing each other. Specifically, the surface and the backside and the space keeping member of the wall member 123 and the arcing member 120 formed along the arcing member passages 121a and 121b at the edge portions of the arcing member passages 121a and 121b facing each other. Creepage distance is secured on the side of the arc extinguishing member 120 by the recessed portion 125 formed by 124. That is, the creepage distance between the magnetic plates 110 is secured.

(3) The inner grooves 122a and 122b having a predetermined length are cut in the bare corners of the extinguishing member passages 121a and 121b, and the inner grooves 122a and 122b are moved into the extinguishing member 120. To open. For this reason, the extinguishing decomposition gas generated by the contact between the extinguishing member 120 and the arc I is rearward of the extinguishing member 120 through the extinguishing member passages 121a and 121b and the inner grooves 122a and 122b. , To the rear of the extinguishing device 100. At this time, since the extinguishing decomposition gas is guided by the flat surface 123a, it is smoothly guided behind the extinguishing member 120.

(4) The arc extinguishing member 120 is provided with a gap retaining member 124 that maintains a constant gap between the magnetic plates 110. In addition, the front and rear surfaces of the wall member 123 and the extinguishing member 120 formed along the extinguishing member passages 121a and 121b at the edge portions of the extinguishing member passages 121a and 121b facing each other are provided. A creepage distance in the side of the arc extinguishing member 120 is secured by the recessed portion 124 formed of 124. Then, the surface of each magnetic plate 11 of the extinguishing member 120 of the gap retaining member 124 to the extent that the front and rear surfaces of the wall member 123 and the extinguishing member 120 do not contact the magnetic plate 110, respectively. And projection heights from the back surface were set respectively. For this reason, it is easy to ensure the creepage distance between the magnetic plates 110.

(5) Protrusions 127 were provided at the edges of the extinguishing member 120. For this reason, generation | occurrence | production of an arc between the edge parts of each magnetic plate 110 can be suppressed.

(6) The width of the fine grooves 112a and 112b is more than 0 and 1.5 mm or less. For this reason, the electron attraction force to the inside of the magnetic plate 110 is secured, and it is possible to secure it to the groove | channel 112a, 112b which is thin even in the arc I of a small electric current area | region.

(2nd embodiment)

Next, 2nd Embodiment of this invention is described according to FIGS. 10-13. As shown in FIG. 10 and FIG. 11, the extinguishing device 30 is provided in the inner end of the power supply side bushing 13. The extinguishing device 30 includes a plurality of magnetic plates 40 formed of a thin plate magnetic material, and a plurality of extinguishing members 50 formed of a thick plate synthetic resin material having insulating and extinguishing properties at predetermined intervals in a moving direction of the movable electrode 18. It is arranged alternately.

(Magnetic Edition)

As shown in Fig. 12, the magnetic plate 40 is shaped like a thin plate by a magnetic material such as steel. In the beam embodiment, the thickness d ₁ of the magnetic plate 40 is 1 mm. A pair of magnetic plate passages 41a and 41b, which allow the contact edges 18a and 18b to pass through the front edges (side edges of the load side bushing 14 side) of the magnetic plate 40, respectively, are predetermined. It is formed at intervals.

As shown in Fig. 13, the inner edges of the magnetic plate passages 41a and 41b face each other to correspond to the contact blades 18a and 18b at least when passing through the magnetic plate passages 41a and 41b. Magnetic plate passages 41a and 41b are formed so that the portions to be parallel to each other are formed. It is preferable to make the width D1 of the magnetic plate passages 41a and 41b very narrow in view of the increase in the magnetic force attraction force generated in the magnetic plate 40, and in this embodiment, the thickness of the contact blades 18a and 18b ( It is 8mm slightly wider than 4mm).

Further, thin grooves 42a and 42b are formed in the bare corners of the magnetic plate passages 41a and 41b, respectively. The width D2 (see FIG. 13) of the thin grooves 42a and 42b is narrower than the width D1 of the magnetic plate passages 41a and 41b, and extends toward the corner in the same direction as the magnetic plate passages 41a and 41b. . The range that the width D2 of the fine grooves 42a and 42b can adopt is 0.5 to 2.0 mm, preferably 0.8 mm to 1.8 mm, and the best range is 0.8 mm to 1.2 mm. The widths D2 of the grooves 42a and 42b are each 1.0 mm.

If this range is exceeded, the electron suction force cannot be sufficiently obtained toward the corners of the thin grooves 42a and 42b generated in the thin grooves 42a and 42b, and stably in the corners of the grooves 42a and 42b where the arc passes. There is a possibility that suction can not be fixed. If it is less than this range, it is necessary to strictly manage the adhesion degree of the magnetic plate 40, and there exists a possibility that the adhesion work efficiency may fall. Insertion holes 44 are formed in four corners of the magnetic plate 40, respectively. In the rear end edge of the magnetic plate 40, cutouts 45 are formed in the two insertion holes 44. In the present embodiment, the thin grooves 42a and 42b constitute a current restricting portion.

(Soho member)

As shown in Fig. 12, the extinguishing member 50 is formed in a thin plate shape by a synthetic resin material (for example, a fluorine resin such as PTFE (tetrafluoroethylene)) having insulation and extinguishing property. This produces an arc extinguishing decomposition gas. In the present embodiment, the thickness d ₂ of the arc extinguishing member 50 is about 6 mm.

A pair of extinguishing member passageways 51a and 51b which allow the contact edges 18a and 18b to pass through the front edges (side edges of the load side bushing 14 side) of the extinguishing member 50 at predetermined intervals, respectively. Formed. The shape of the arc extinguishing member passages 51a and 51b is formed to substantially coincide with the magnetic plate passages 41a and 41b, and the width Ｗ1 is 7 mm slightly narrower than the magnetic plate passages 41a and 41b. .

Horizontal grooves 53a and 53b are formed in the bare corners of the two arc member passages 51a and 51b via communication grooves 52a and 52b, respectively. In other words, a narrow width portion is provided in the middle of the arc member passages 51a and 51b, whereby communication grooves 52a and 52b are formed. The narrow width portion constitutes a movement suppressing structure that suppresses movement toward the opening in the arc extinguishing member 50 of the arc extinguishing decomposition gas.

The width # 2 of the communication grooves 52a and 52b is narrower than the width # 1 of the arc extinguishing member passages 51a and 51b, and is set to about 2.5 mm in this embodiment. The horizontal grooves 53a and 53b have a long hole shape extending in a direction perpendicular to the direction in which the communication grooves 52a and 52b extend, and the communication grooves 52a and 52b are the horizontal grooves 53a. It communicates near the center of 53b. The two lateral grooves 53a and 53b constitute a pressure chamber for holding the extinguishing cracking gas generated by arc heat.

Projections 54 are formed in four corners of the upper and lower surfaces of the arc extinguishing member 50, and through holes 55 are formed in the projections 54, respectively. Each of the protrusions 54 maintains a constant distance between the magnetic plate 40 and the arc extinguishing member 50, and furthermore, a distance between the arc extinguishing members 50 and 50 adjacent to each other with respect to the moving direction of the movable electrode 18. It functions as a holding member. In the state in which the magnetic plates 40 and the arc extinguishing members 50 are alternately stacked, the arrangement interval d ₃ of the arc extinguishing members 50 and 50 adjacent to each other in the moving direction of the movable electrode 18 is a predetermined value (this embodiment). In this case, the protrusion height of each protrusion 54 is set to be 3 mm).

(Fixed structure)

As shown in FIG. 11, the extinguishing device 30 is fixed to the upper surface of the fixed electrode 15 via the supporting member 60. That is, the extinguishing device 30 is disposed between the upper surface of the supporting member 60 and the pair of fixing members 61 and 61 protruding at a predetermined interval on the upper surface of the supporting member 60, The upper end portions of the fixing members 61 and 61 are pushed upward by the pressing members 62 and 62 protruding inward, respectively. Further, fixing bolts 63 having insulation from four corners of the extinguishing device 30 in the state where the insertion grooves 44 of the magnetic plates 40 and the through holes 55 of the extinguishing member 50 coincide with each other. ) (See FIG. 12), and the extinguishing device 30 is fixed to the upper surface of the supporting member 60 by tightening against the supporting member 60.

(Operation of Embodiments)

Next, the operation of the switchgear extinguishing device configured as described above will be described. When the movable electrode 18 is separated from the fixed electrode 15 by the circuit opening operation of the manipulation handle, between the two electrodes 15 and 18, that is, between the fixed electrode 15 and the two contact blades 18a and 18b. In each case an arc occurs. The inclination of the magnetic flux distribution occurs due to the presence of the magnetic plate 40 around the arc pillar. The arc is always driven to the corner of the magnetic plate 40 by the electromagnetic force issued to the magnetic plate 40 in accordance with the right-hand law and the Fleming's left hand law, and the two magnetic plate passages 41a and 41b (see FIG. 12). It concentrates and fixes in the corner of the groove | channel 42a, 42b which passes through a bare corner.

On the inner edges of the magnetic plate passages 41a and 41b facing each other, the movable electrode 18 (strictly the contact blades 18a and 18b) at least when passing through the magnetic plate passages 41a and 41b. Since the corresponding parts are parallel to each other, the electromagnetic force generated between these parts becomes equal. As a result, the arc is stabilized and driven toward the corners of the magnetic plate passages 41a and 41b.

Since the width D1 of the magnetic plate passages 41a and 41b becomes very narrow in a range where the contact blades 18a and 18b do not interfere during opening and closing, for example, in one cutout formed at the front edge of the magnetic plate 40. Compared with the case where the contact blades 18a and 18b are allowed to pass, the electron attraction force toward the corner of the magnetic plate 40 increases. This is because the width D1 of the magnetic plate passages 41a and 41b is narrower than the width of the cutout. In other words, the cutout or two cutting blades 18a and 18b can pass through collectively, and the width D1 of the magnetic plate passages 41a and 41b is one contact blade 18a and 18b, respectively. Is enough to pass. For this reason, the electron attraction force can be increased. In particular, it is effective when opening a small current of less than 5A.

In addition, since the width D2 of the thin grooves 42a and 42b is narrower than the width D1 of the magnetic plate passages 41a and 41b, the thin grooves 42a and 42b are stronger than the magnetic plate passages 41a and 41b. Electron attraction is generated. For this reason, the exciting current arc and the charging current arc are formed in the corners of the thin grooves 42a and 42b by the strong electromagnetic force generated in the grooves 42a and 42b even when the arc time becomes longer when the exciting current or the charging current is opened. Is fixed by suction, and an arc spot is formed in the corner of these thin grooves 42a and 42b. In this connection, in the case where the thin grooves 42a and 42b are not formed, it becomes impossible to fix the arc such as an excitation current arc or a charging current arc.

In this way, the arc is pulled in a fixed state concentrating on the bare corners of the thin grooves 42a and 42b and divided by the magnetic plates 40, and the anode, the cathode drop, the cooling, and the like act effectively. The arc voltage can rise dramatically. The arc is stabilized near the center between the bottom corner of the grooves 42a and 942b of the magnetic plate 40 and the trailing edge.

On the other hand, the magnetic plate 40 and the arc extinguishing member 50 are alternately arranged in the moving direction of the movable electrode 18, so that the arc is driven toward the corner of the magnetic plate 40 while contacting the upper and lower surfaces of the arc extinguishing member 50. do. At this time, arc-extinguishing gas is generated on the upper and lower surfaces of the arc extinguishing member 50 by arc heat, and arc extinguishing is promoted by the arc-extinguishing gas. This works especially well for large current openings in excess of 30A.

That is, the large current arc has a high energy and strong magnetic force attraction force generated in each magnetic plate 40. For this reason, the arc is driven toward the corners of the grooves 42a and 42b, and further to the rear of the extinguishing member 50, and actively contacts the upper and lower surfaces of the extinguishing member 50. In addition, since the amount of heat generated is higher than that of the microcurrent arc and the small current arc, the amount of extinguishing decomposition gas generated on the upper and lower surfaces of the extinguishing member 50 is also sufficiently secured.

Moreover, the inner surface of the extinguishing member passages 51a and 51b is exposed to the arc while the contact blades 18a and 18b pass through the extinguishing member passages 51a and 51b. The extinguishing cracked gas is generated on the inner surface of the extinguishing member passages 51a and 51b by the heat of the arc, and the extinguishing is promoted by the extinguishing cracking gas. This is particularly effective at the opening of the microcurrent.

That is, the microcurrent arc has less energy than the high current arc, and the electromagnetic force generated in each magnetic plate 40 is also weak. For this reason, the arc may not be driven to the corners of the narrow grooves 42a and 42b. In this case, the amount of anti-corrosive decomposition gas generated on the upper and lower surfaces of the extinguishing member 50 is lower than when the large current is opened. However, the decrease in the amount of generation of the arc extinguishing gas at the time of opening the microcurrent is compensated by the arc extinguishing gas generated on the inner surface of the arc extinguishing member passages 51a and 51b located near the arc current arc point.

In addition, when the arc travels in the arc spot of each of the grooves 42a and 42b, which is thin in each magnetic plate 40, the blocked portion of the communication grooves 52a and 52b of each extinguishing member 50, that is, the horizontal groove ( The extinguishing decomposition gas is also generated in the corner walls 53a and 53b corresponding to the communication grooves 52a and 52b (hereinafter referred to as the dead end wall). This arc extinguishing gas also promotes arc extinguishing. This is effective when the arc time is prolonged, for example, when an excitation current or a charging current is opened. This is because the exciting current arc and the charging current arc are sucked and fixed to the corners of the thin grooves 42a and 42b by the strong electromagnetic force of the thin grooves 42a and 42b.

The arc extinguishing gas generated in the dead wall or the like moves from the extinguishing member 50 to the opening side (the opposite side of the corner) in the width Ｗ2 of the communicating grooves 52a and 52b. The width of the extinguishing member passage 51a and 51b. It is narrower than Ｗ1 and is suppressed. That is, the arc extinguishing gas in the horizontal grooves 53a and 53b is hard to exit from the horizontal grooves 53a and 53b. Because of this, the extinguishing cracking gas present in the lateral grooves 53a and 53b stays in the lateral grooves 53a and 53b and is stored, thereby increasing the extinguishing cracking gas pressure in the lateral grooves 53a and 53b. have. The arc extinguishing is accelerated by the contact of the arc-extinguishing cracked gas with high pressure. This is particularly effective at opening excitation currents and charging currents.

That is, in the normal load current, since the current waveform and the voltage waveform are substantially the same period, the voltage becomes OV at the current OA. This makes it easy to block. However, since the phase of the excitation current is delayed by 90 degrees from the phase of the current, and the charging current is 90 degrees above the phase of the current, the voltage peaks and becomes difficult to cut off when the current OA is reached. The arc extinguishing decomposition gas having a high pressure in the lateral grooves 53a and 53b can be contacted with an exciting current arc or a charging current arc to extinguish even at a current O point where the voltage peaks.

In addition, the width X1 of the arc extinguishing member passages 51a and 51b is very narrow, and the inner surfaces of the arc extinguishing member passages 51a and 51b are adjacent to both side surfaces of the contact blades 18a and 18b, respectively. Further it spacing of the magnetic plate 40, the thickness d ₁ (Lo member 50 of d ₃ <secured over a small arc having a thickness d ₂ of the member 50 is predetermined so that the thickness of the extinguishing element d ₂ (Fig. 12 For this reason, a narrow gap effect is obtained by the two contact blades 18a and 18b sequentially passing through each of the arc member passages 51a and 51b, ie, the arc is formed between the arc member passages 51a and 51b. It is confined to a high density state and the so-called narrow spacing effect promotes arc extinguishing.

In addition, since the magnetic plate 40 and the extinguishing member 50 are alternately arranged at predetermined intervals in the moving direction of the movable electrode 18, the inner surface of the extinguishing member 50 (the inner surface of the extinguishing member passage 51a, 51b, the communication groove). 52a and 52b inner surfaces, and carbides continuously adhere to the inner grooves 53a and 53b, respectively, are dust-proof. For this reason, continuous carbon screen is not formed in the inner surface of the arc extinguishing member 50, and deterioration of extinguishing performance is suppressed.

Moreover, the space | interval of the magnetic plate 40 and the arc extinguishing member 50 is open all around them, and it is possible to derive outside the arc extinguishing gas decomposition which generate | occur | produced in the arc extinguishing member path | route 51a, 51b. In particular, the arc extinguishing gas mainly flows to the rear of the magnetic plate 40 and the arc extinguishing member 50 as the arc is generated during the opening of the large current. The arc is blown to the rear of the magnetic plate 40 by the extinguishing decomposition gas, and the arc is further pulled out.

That is, arc extinguishing is accelerated by the arc blowing effect by the extinguishing decomposition gas flowing behind the magnetic plate 40. Once the extinguishing performance exhibits the extinguishing performance, the extinguishing cracking gas contains metal vapor and causes re-burning, but the extinguishing cracking gas is quickly led to the rear of the magnetic plate 40 to prevent re-burning. When the movable electrode 18 moves to the open position indicated by the dashed-dotted line in Fig. 1, the arc is completely extinguished and the circuit opening operation is completed. When the circuit is closed, the operation in the reverse order to the above-described circuit opening is performed.

(Effect of 2nd Embodiment)

Therefore, according to 2nd Embodiment, the following effects can be acquired.

(1) The magnetic plates 40 having the magnetic plate passages 41a and 41b and the extinguishing member 50 having the arcing member passages 51a and 51b are alternated at predetermined intervals in the moving direction of the movable electrode 18. Posted by. At the time of opening the circuit, the movable electrodes 18 spaced apart from the fixed electrode 15 pass through the magnetic plate passages 41a and 41b and the arc extinguishing member passages 51a and 51b sequentially. For this reason, the arc is driven toward the corner of the magnetic plate 40 while contacting the upper and lower surfaces of the arc extinguishing member 50. At this time, the arc extinguishing gas is generated on the upper and lower surfaces of the extinguishing member 50 by arc heat, and the extinguishing is accelerated by the extinguishing decomposition gas. Therefore, extruding performance can be improved.

(2) Similarly, carbides are continuously attached to the inner surface of the magnetic plate 40 and the extinguishing member 50 (that is, the inner surface of the arcing member passages 51a and 51b, the inner surface of the communication grooves 52a and 52b and the inner surface of the horizontal grooves 53a and 53b). Dustproof Accordingly, continuous carbon screens are not formed on the inner surface of the arc extinguishing member 50, and deterioration of the arc extinguishing performance is suppressed. Furthermore, the long-term arc performance can be kept long.

(3) Similarly, the magnetic plate 40 and the arc extinguishing member 50 are alternately arranged at predetermined intervals in the moving direction of the movable electrode 18, so that the gap between the magnetic plate 40 and the arc extinguishing member 50 is in their entire circumferential direction. Open across. Thereby, the extinguishing decomposition gas generated in the extinguishing member passages 51a and 51b can be led to the outside. In particular, when the large current is opened, the arc is blown to the rear of the magnetic plate 40 by the extinguishing decomposition gas, and the arc is further stretched. That is, arc extinguishing effect by the arc extinguishing gas which flows behind the magnetic plate 40 can be accelerated | stimulated.

(4) Horizontal grooves 53a and 53b are formed in the far corners of the arc extinguishing member passages 51a and 51b for retaining the arc extinguishing decomposition gas. For this reason, the extinguishing cracked gas generated by arc heat stays in the horizontal grooves 53a and 53b, thereby increasing the extinguishing cracked gas pressure in the horizontal grooves 53a and 53b. When the pressure-extinguishing extinguishing decomposition gas contacts an arc, extinguishing is promoted, and further, extinguishing performance can be improved.

(5) When the thickness d ₁ of the magnetic plate 40, the thickness d ₂ of the arc extinguishing member 50, and the arrangement interval d ₃ of the arc extinguishing member 50, the magnetic plate is such that "d ₁ <d ₃ <d ₂ ". 40 and the arc extinguishing member 50 were formed and arranged. That is, the thickness d ₂ of the arc extinguishing member 50 is secured to a predetermined level or more, and the arc extinguishing member 50 is arranged at a predetermined interval. For this reason, a narrow space | interval effect is acquired by passing through the extinguishing member path | route 51a, 51b in both contact blades 18a and 18b sequentially, and arc extinguishing is accelerated | stimulated. Therefore, it is possible to extinguish the micro current arc which has a small driving force compared with the large current arc and the small current arc. That is, the arc extruding performance can be improved.

(6) The width D1 of the magnetic plate passages 41a and 41b was made very narrow in the range where the contact blades 18a and 18b did not interfere during opening and closing. For this reason, for example, compared with the case where the contact blades 18a and 18b pass through one cutout formed at the front edge of the magnetic plate 40, the electromagnetic attraction force toward the corner of the magnetic plate 40 generated in the magnetic plate 40 is applied. You can increase it.

(7) Thin grooves 42a and 42b are formed in the bare corners of the magnetic plate passages 41a and 41b, and the width D2 of the thin grooves 42a and 42b is the magnetic plate passages 41a and 41b. It was made narrower than width D1 of. For this reason, the magnetic attraction force stronger than the magnetic plate passage 41a, 41b generate | occur | produces in the thin groove | channel 42a, 42b.

Therefore, for example, in the corners of the grooves 42a and 42b for the excitation current arc or the charging current arc due to the strong electromagnetic force generated in the grooves 42a and 42b that the arc time becomes longer when the excitation current or the charge current is opened. Suction can be fixed.

(8) A cutout 45 was formed at the trailing edge of the magnetic plate 40. In the close contact state of the magnetic plate 40 arc extinguishing member 50, the cutout 45 is located inside the trailing edge of the arc extinguishing member 50. For this reason, it is possible to prevent the arc from traveling between the trailing edges of the magnetic plates 40.

(9) The movable electrode 18 was made into a tumble blade type consisting of two contact blades 18a and 18b. For this reason, unlike the case where a rod-shaped bat electrode is used, the width D1 of the magnetic plate passages 41a and 41b can be further narrowed. Furthermore, the electromagnetic force generated by the arc also increases.

(10) Magnetic plates such that portions corresponding to the movable electrodes 18 are parallel to each other when passing through the magnetic plate passages 41a and 41b at least at inner edges of the magnetic plate passages 41a and 41b facing each other. The passages 41a and 41b were formed.

For this reason, the electromagnetic force generated between these parts is equal, and the arc is stably driven toward the corners of the magnetic plate passages 41a and 41b. Therefore, the extinguishing performance of the extinguishing device 30 can be improved.

(11) In the bare corners of the magnetic plate passages 41a and 941b, thin grooves 42a and 42b having a narrower width than the magnetic plate passages 41a and 41b are formed, and the thin grooves 42a and 42b are formed. Width D2) is set within the range of 0.5 to 2 mm. For this reason, the electron suction force in the corner of this thin groove 42a, 42b which generate | occur | produces in the thin groove | channel 42a, 42b can fully be acquired. Therefore, it is possible to prevent the arc from returning to the opening of the magnetic plate 40 (rebound of the arc).

(12) In the middle of the arc member paths 51a and 51b, the narrow width portion W was provided to form the communication grooves 52a and 52b. Since the width W2 of the communication grooves 52a and 52b is narrower than the width W1 of the extinguishing member passages 51a and 51b, the extinguishing cracked gas remaining in the horizontal grooves 53a and 53b is the opening of the extinguishing member 50. It does not go back. For this reason, the extinguishing cracking gas (that is, the extinguishing cracking gas remaining in the horizontal grooves 53a and 53b) present in the corner of the extinguishing member passageways 51a and 51b rather than the narrow width portion W is formed at the opening side (the extinguishing member 50). Movement to the opposite side of the corner) is suppressed. The extinguishing cracked gas stays in the corner of the extinguishing member passages 51a and 51b rather than the narrow portion, and the extinguishing cracking gas pressure becomes higher in the corner. Therefore, the extinguishing performance of the extinguishing device 30 can be further improved.

(Excluded)

Moreover, you may change and implement the 1st, 2nd embodiment as follows.

In the second embodiment, the incidence portion 45 is formed at the trailing edge of the magnetic plate 40 to prevent running of the arc between the trailing edges of the magnetic plates 40. However, the following may be used. That is, the rear end protrusion (not shown) which protrudes outward from the rear end edge of the magnetic plate 40 is formed in the trailing edge of the extinguishing member 50, without forming the cutout 45 of the magnetic plate 40. FIG. This makes it possible to prevent the arc from running between the trailing edges of the magnetic plates 40.

In the second embodiment, cut portions (not shown) such as cut portions 45 may be formed on both side edges of the magnetic plate 40, respectively. Alternatively, side edge protrusions (not shown) may be formed on both side edges of the arc extinguishing member 50 to protrude outward from both side edges of the magnetic plate 40. In this way, the arc can be prevented from running between the two side edges of the respective magnetic plates 40 without returning to the side of the magnetic plates 40. When it becomes impossible to block, an arc may drive between the both edges of the magnetic plate 40, but this is prevented.

In the second embodiment, as shown in FIG. 14, some of the members may be scraped away from the extinguishing member 50 to delete unnecessary parts. That is, the extinguishing member 50 is formed on the outer surface of the wall member 70a constituting the extinguishing member passages 51a and 51b, the communication grooves 52a and 52b, and the horizontal grooves 53a and 53b. It consists mainly of the formed reinforcement wall 70b. In this way, unlike the case where the thickness of the extinguishing member 50 is made uniform to d2, the material necessary for forming the extinguishing member 50 is reduced. For this reason, it is possible to reduce the material cost of the extinguishing member 50. Furthermore, it is possible to reduce the product cost of the extinguishing device 30. Moreover, the wall member 70a functions as an arc contact member which contacts this high current arc and produces | generates extinguishing decomposition gas at the time of a large current opening, etc., for example. The reinforcing wall 70b functions as a magnetic inter-plate insulating member for securing insulation between the magnetic plates 40 arranged at predetermined intervals in the vertical direction in FIG. 14.

-In the second embodiment, the extinguishing device 30 is used as a double blade type switch, but may be used as a double blade type or single blade type rotary switch. That is, as shown in FIG. 15, a pair of movable electrodes 73 and 74 protrude in opposite directions to the rotating insulator 72 rotating about the shaft 71 by the operation of an externally operable opening / closing link function. It is installed. The movable electrodes 73 and 74 are each composed of two contact blades or a single purchase contact blade. If it does in this way, in a rotary switch, the effect similar to the effect of (1)-(12) in 2nd Embodiment can be acquired.

In addition, in the above second embodiment, as shown in Fig. 16, the extinguishing device 30 may be used as a switch of a single blade type. In this case, since the movable electrodes 75 are constituted by the single purchase contact blades 75a, one magnetic plate passage (not shown), horizontal grooves 76a, and one extinguishing member passage 76b are formed. In addition, the fixed electrode (not shown) is configured such that the contact blades 75a can be sandwiched between the two fixed contacts, for example, with only a predetermined distance between the pair of fixed contacts. If it does in this way, in the single blade type switch, the effect similar to the effect of (1)-(12) in 2nd Embodiment can be acquired.

In addition, in the above second embodiment, as shown in Fig. 17, the extinguishing device 30 may be used in a switch of the type in which the movable electrode is inserted and removed in the in-phase direction. In this case, the arc extinguishing device 30 is arrange | positioned so that the arrangement direction of the magnetic plate 40 and the arc extinguishing member 50 may become an in-phase direction. In addition, a conductor 77 having plasticity is fixed to the inner end of the load side bushing 14, and a base end of the movable electrode 78 is fixed to the distal end of the conductor 77. In addition, the proximal end of the movable electrode 78 is connected to the rotating shaft 80 via the insulating drive link (79). Accordingly, as the rotation shaft 80 rotates, the movable electrode 78 moves in the in-phase direction. In this case, in the switch of the type in which the movable electrode is inserted and removed in the in-phase direction, the same effects as in (1) to (12) in the second embodiment can be obtained.

The arc extinguishing device 100 and the arc extinguishing device 30 according to the first and second embodiments above may be combined with a gas extinguishing medium such as carbon dioxide (CO2).

-In the second embodiment, one horizontal grooves 53a and 53b are provided for the arcing member passages 51a and 51b, respectively, but as shown in FIG. 18, the arcing member passages 51a and 51b. A plurality of horizontal grooves 53a and 53b may be arranged in the extending direction of the arc extinguishing member passages 51a and 51b, respectively.

In the second embodiment above, as shown in FIG. 19, a single or a plurality of gas exhaust passages 81 (two in FIG. 19) may be formed on the inner walls of the horizontal grooves 53a and 53b. . However, the gas exhaust passage 81 is preferably formed by avoiding the upper projecting contact wall in the horizontal grooves 53a and 53b. It is for not reducing the amount of extinguishing cracked gas which arises when an arc protrudes in contact with this protruding contact wall. In this way, the extinguishing decomposition gas flows smoothly to the rear of the extinguishing section 50, and the blowing effect of the arc is improved.

-In the second embodiment above, the horizontal grooves 53a and 53b are formed to penetrate the front and back of the arc extinguishing member 50, but only a part of the horizontal spheres 53a and 53b may be penetrated. For example, as shown in Figs. 20A and 20B, the row trees 53a and 53b are formed in a concave shape, and the communication grooves 52a and 52b are extended in the horizontal grooves 53a and 53b as they are. Even in this case, the same effects as in (3) and (11) can be obtained in the second embodiment.

In the second embodiment, as shown in FIG. 21, the horizontal grooves 53a and 53b may be omitted. That is, the narrow width part W is provided in the middle of the inside of the extinguishing member passages 51a and 51b, and only the communication grooves 52a and 52b are formed. In this case, it is possible to suppress the movement of the extinguishing cracking gas existing inside the narrow width portion W in the extinguishing member passages 51a and 51b to the opening side (the opposite side of the inner side) in the extinguishing member 50. It is possible.

In the above first embodiment, the thin grooves 112a and 112b of the magnetic plate 110 constituting the small current constraining portion are parallel grooves having a constant width D2, respectively, but the width narrows toward the inner side. It may be a tapered groove. For example, as shown in FIG. 22, the width | variety of the entrance part of thin groove | channel 112a, 112b shall be 0.8 mm, and the width | variety of a bare corner shall be 0.5 mm. By changing the width from the inlet portion of the fine grooves 112a and 112b to the bare corners, the closing of the fine grooves 112a and 112b due to the repetition of the current interruption is suppressed.

If the frequency of use increases, the surface and the back surface of the magnetic plate 110 become rough at the inlet of the thin grooves 112a and 112b. Then, since the width | variety D2 of the fine grooves 112a and 112b is set to become very narrow, there exists a possibility that the fine grooves 112a and 112b will be closed. Closing is reduced at the inlet of the narrow grooves 112a and 112b by making the width of the inlet portions of the narrow grooves 112a and 112b prone to this closure widen in a range where small currents can be conveyed. However, the width of the inlet portions of the fine grooves 112a and 112b is also set within the acceptable range of the width D2 of the above-mentioned fine grooves 112a and 112b.

In the first embodiment, as shown in FIG. 23, at the rear ends of the wall members 123 and 123 formed as a pair, respectively provided on the inner edges of the magnetic plate passages 111a and 111b facing each other, The guide walls G may be provided respectively. Both guide walls G and G are formed to extend toward the rear of the arc extinguishing member 120. By doing so, it is possible to more efficiently diffuse the extinguishing decomposition gas including the metal vapor to the rear of the extinguishing member 120.

In addition, in the above first embodiment, as shown in FIG. 23, the diffusion protrusions 126 are formed on the extension lines of the inner grooves 122a and 122b on the rear surface side of the arc extinguishing member 120, respectively. Also good. In FIG. 23, the diffusion protrusion 126 is formed in a large columnar shape, and the diffusion protrusion 126 is disposed to be wider toward the rear of the arc extinguishing member 120. In this case, the extinguishing gas including the metal vapor guided and discharged to the rear of the extinguishing member 120 is diffused by the diffusion protrusion 126, and the fresh air is returned to the rear of the diffusion protrusion 126. By diluting with and diluting, the insulation of the atmosphere is quickly recovered. In addition, the arc extinguishing gas can be smoothly guided to the rear. By spreading the extinguishing digestive gas, the insulation resistance of the atmosphere is increased behind the inner grooves 122a and 122b of the extinguishing member 120, and the path insulation resistance of the arc I is increased, so that Contribute. In addition, the diffusion protrusion 126 may be formed in a square pillar shape or the like.

In the first embodiment, as shown by the dashed-dotted line in FIG. 6, the support portion 132 of the support member 130 may be covered by the insulating member Z from the outside. Strictly, the protrusion 113 of the magnetic plate 110 exposed on the outer surface of the support part 132 is covered by the insulating member x from the outside. By doing so, it is possible to avoid the generation of arcs between both edges of the magnetic plates 110.

In the first embodiment, the extinguishing member 120 is formed by PFA. However, if the synthetic resin material contains fluorine, which is a kind of negative atom, the extinguishing member 120 may be changed to a simple material. For example, the material of the extinguishing member 120 may be made of tetrafluoroethylene (PTFE), tetrafluoroethylene hexafluoropropylene (FEP), tetrafluoroethylene ethylene ethylene copolymer (ETFE), polybrinidene fluoride (PVdF) And trifluoroethylene ethylene chloride (PCTFE). In addition, polychlorotrifluoroethylene, vinyl fluoride, ethylene trifluoride, vinylidene fluoride, and propylene hexafluoride. Examples of the negative atoms include chlorine, bromine and sulfur in addition to fluorine described above. If a material including these negativeners is selected as the material of the extinguishing member 120, negative atoms are emitted from the extinguishing member 120 by arc heat, and electrons in the arc are adsorbed by the negative atoms. As a result, the extruding performance is increased.

In the first embodiment, the magnetic material may be formed of a ferritic stainless steel containing 9.0 to 16.0% by weight of chromium and 0.006 to 0.020% by weight of carbon.

In the first embodiment, the lower extinguishing member 120 may be in intimate contact with the upper surface of the base 131.

In the first embodiment, a single or a plurality of insulating walls may be formed on the inner surface of the base, and the insulating walls and the lowermost extinguishing member 120 may be superposed.

-In 1st Embodiment, the disengagement prevention means may be provided in the front-end | tip part of the engagement protrusion part 140. FIG.

In the first embodiment, in the lowermost arc extinguishing member 120, microscopic arc extinguishing means may be provided at the peripheral edges of the arc extinguishing member passages 121a and 121b.

In the first embodiment, the inner surface of the base 131 of the support member 130 may be covered by the gap holding means 124 in the arc-extinguishing member 120 of the lowermost layer.

-In the above first and second embodiments, the arc extinguishing device 100 and the arc extinguishing device 30 are each used in a high pressure AC load switch, but it is also possible to use the high pressure circuit breaker, for example.

In the first and second embodiments, the extinguishing members 120 and 50 and the magnetic plates 110 and 40 are prepared and assembled, respectively, as shown in FIGS. 24A and 24B. The plate 110 may be integrated into a unit. By doing so, it is also possible to appropriately select and assemble the stacking numbers of the arc extinguishing members 120 and 50 and the magnetic plates 110 and 40.

(Third embodiment)

Hereinafter, the 3rd Embodiment which embodied this invention in the arc extinguishing device 100A of the double-blade-type switchgear is demonstrated according to FIGS. 25-39. In addition, the same member number is attached | subjected to the same member as 1st Embodiment, and the overlapping description is abbreviate | omitted.

As shown in Fig. 25, both side walls 12a and 12b of the main body case 12 of the switch 11 face each other in three phases of the power side bushing 13 and the load side bushing 14 (Fig. 25). In the above, only one phase is shown to be penetrated to face each other. The extinguishing device 100A is fixed to the inner end of the power source side bushing 13 (the front end side of the fixed electrode 15) via the fixing metal member 318. The base end of the movable electrode 21 is rotatably supported by the conductive rod 16 of the load side bushing 14 via the shaft 17. As shown by the dashed-dotted line in FIG. 26, the movable electrode 21 is provided with a pair of contact blades 21a and 21b on a parallel flat plate.

Meanwhile, as shown in FIG. 25, one end of the drive link 24 is rotatably connected to the front end of the lever 20, and the front end of the drive link 24 is located near the center of the movable electrode 21. It is connected rotatably. Accordingly, if the operation handle is operated, the movable electrode 21 is shown by a dashed line in FIG. 25 about the shaft 17 via the link mechanism, the pivot shaft 19, the lever 20 and the drive link 24. It moves between the donny input position and the open position shown by the solid line.

(Drive link)

Next, the driving link 24 will be described in detail. As shown in Fig. 37, the drive link 24 is formed of a synthetic resin material having a large dielectric strength such as polyethylene terephthalate and nylon. On the outer circumferential surface of the drive link 24, a plurality of recesses 31 are formed on the surface on the fixed electrode 15 side and the surface on the rotation shaft 19 side, respectively. As a result, the creepage distance between the connecting portion on the movable electrode 21 side of the drive link 24 and the connecting portion on the lever 20 side is secured.

As shown in Figs. 37 and 38, on the outer circumferential surface of the drive link 24, in-phase barriers 32 are ideal for two surfaces that are orthogonal to the surfaces on which the recesses 31 are formed. It is formed to extend in the direction (left-right direction in FIG. 38) between i). In addition, a blower member 33 is provided on the connection portion between the drive link 24 and the movable electrode 21 in contact with the outer edges of the interphase barrier barriers 32 and 32. The blowing member 33 is formed to be orthogonal to the barrier 32 and 32 between both phases.

As shown by the dashed-dotted line in FIG. 25, the interphase barrier 32 and the blowing member 33 are located below the arc extinguishing device 100A in the closing state (closed state) of the switch 11. In addition, as shown by the solid line in FIG. 25, in the open state (open state) of the switch 11, the in-phase barrier 32 is located between the fixed electrode 15 and the pivot shaft 19. Together, the blowing member 33 corresponds to the central portion of the arc extinguishing device 100A. As the blowing member 33 moves from the feeding position shown by the dashed-dotted line in FIG. 25 to the open position shown by the solid line, wind toward the arc extinguishing device 100A side is generated. Due to this wind pressure, the arc generated between the fixed electrode 15 and the movable electrode 21 at the time of opening the circuit is pressed into the arc extinguishing device 100A. Thus, the length of the drive link 24, the width of the in-phase barrier 32, the position of the blowing member 33, and the like are set.

(Social device)

Next, the arc extinguishing device 100A will be described in detail. As shown in FIGS. 27 to 29, the arc extinguishing device 100A includes a plurality of magnetic plates 110 formed in a plate shape by a magnetic material, and a plurality of extinguishing members 120 formed in a plate shape by a synthetic resin material having insulation and arc extruding properties. Equipped with. The magnetic plates 110 and the arc extinguishing members 120 are alternately arranged at predetermined intervals in the moving direction of the movable electrode 21. Each magnetic plate 110 and each extinguishing member 120 are disposed between the pair of supporting members 130 and 130, respectively, and are collectively supported. Hereinafter, the supporting member 130, the magnetic plate 110 and the arc extinguishing member 120 will be described in order.

(Support member)

First, the supporting member 130 will be described. As shown in FIGS. 27 to 30, the support member 130 includes a base 131 fixed to the fixed electrode 15 via a fixing metal member 318 and a support part formed to be inclined with respect to the base 131. 132 is provided.

As shown in FIG. 27, an inclined surface 131a is formed on the upper surface of the base 131. The lower surface of the edge part (protrusion part 127 mentioned later) of the extinguishing member 120 of the lowest layer is in close contact with this inclined surface 131a. On the rear side of the support part 132, the front edge part (the front edge part of the protrusion part 127 mentioned later) of the lower-most extinguishing member 120 is in close contact. As a result, leakage from the arc extinguishing device 100A of the arc extinguishing gas generated from the arc extinguishing member 120 by exposure to the arc I is suppressed.

In addition, as illustrated in FIG. 30, an insulating wall 135 is formed on an inner side surface of the base 131. The insulating wall 135 is formed to be parallel to the magnetic plate 110 and the arc extinguishing member 120 supported between the support members 130 and 130. As shown in FIG. 39, the insulating wall 135 is formed of an edge portion (protrusion 127 to be described later) of the lowermost extinguishing member 120 among the extinguishing members 120 supported by both supporting members 130 and 130. It is installed to overlap some parts. Thereby, the external leakage of the arc extinguishing gas to both the support members 130 and 130 side of the arc extinguishing device 100A is suppressed. Further, both supporting members 130 and 130 are disposed on the front side of the arc extinguishing device 100A (that is, the opening side of the movable electrode passing portion α to be described later). Both support members 130 and 130 are disposed at a position far from the rear surface of the extinguishing device 100A so that both support members 130 and 130 are returned by the return of the extinguishing cracked gas discharged to the rear of the extinguishing device 100A. ) Fouling is suppressed.

(Magnetic Edition)

Next, the magnetic plate 110 will be described. As shown in FIG. 32, the magnetic plate 110 is formed in a W shape by a magnetic body. In this embodiment, a ferritic stainless steel is used as a magnetic body. Ferritic stainless steels are excellent in generating electromagnetic force as well as having antirust effect on the material itself. The magnetic plate 110 is formed by punching a plate of ferritic stainless steel by pressing, and then annealing. Annealing removes the distortion by the residual stress of the magnetic plate 110 which generate | occur | produced at the time of press work by heating a steel at predetermined temperature, and cooling gradually. The content of chromium (Cr) and carbon (C) contained in the ferritic stainless steel will be described in detail later.

A pair of magnetic plate passages 111a and 111b are formed at the front edges of the magnetic plates 110 (edges on the side of the load side bushings 14) so as to pass through the contact blades 21a and 21b respectively. ?All. Both magnetic plate passages 111a and 111b are each formed in a tapered shape in which the width (length in the horizontal direction in FIG. 32) decreases toward the rear end side (inside).

Cutting grooves 112a and 112b are formed in the bare corners of the magnetic plate passages 111a and 111b, respectively. Both cutouts 112a and 112b extend in the same direction as the magnetic plate passages 111a and 111b, that is, inward (that is, the trailing edge of the magnetic plate 110). The bare corners of the two magnetic plate passages 111a and 111b and the cutting grooves 112a and 112b are smoothly connected. Both cutting grooves 112a and 112b are parallel grooves having a constant width.

A pair of protrusions 113 and 113 are formed at the front ends of both edges of the magnetic plate 110, respectively. 30 and 31, both protrusions 113 and 113 are coupled to the magnetic plate support holes 133 of both support members 130 and 130 from the inside, respectively. In this state, the protrusion 113 from the outer surface of the support member 130 of the protrusion 113 is plastically deformed by hitting it from the outside with a positive or the like so as to detach from the support plate 133 for the magnetic plate of the protrusion 113. This is avoided.

(Soho member)

Next, the arc extinguishing member 120 will be described. As shown in Figs. 26 and 28, a pair of extinguishing member passages 121a are allowed to pass through the contact edges 21a and 21b to the front edge (edge on the side of the load side bushing 14) of the extinguishing member 120, respectively. , 121b) is formed at predetermined intervals. Inner corners 122a and 122b are formed in the far corners of both arc-member member passages 121a and 121b, respectively. The inner grooves 122a and 122b extend in parallel with the cutout grooves 112a and 112b inwardly (that is, the trailing edge of the extinguishing member 120) similarly to the extinguishing member passages 121a and 121b. The widths of the inner holes 122a and 122b are smaller than the widths of the arc member passages 121a and 121b.

As shown in FIG. 33, on the rear surface of the extinguishing member 120, arc contact walls (wall members) 123 protrude from the inner edges of the extinguishing member passages 121a and 121b, respectively. The inner surface of the arc contact wall 123 forms a continuous flat surface 123a. The arc contact wall 123 (strictly, the flat surface 123a of the arc contact wall 123) functions as an arc contact member which contacts this high current arc and generates an arc extinguishing gas at the time of a large current opening etc. .

(Opening)

As shown in Figs. 29, 30 and 33, the openings 123b of the extinguishing cracked gas are formed at the innermost part of each arc contact wall 123, respectively. Each opening 123b is formed to be cut in parallel with each other. The extinguishing decomposition gas generated by the extinguishing member 120 being exposed to the arc flows laterally through each opening 123b.

(Arc stop wall)

33, on the rear surface of the arc extinguishing member 120, thick wall portions 324 in the form of blocks are formed on the inner edges of the inner spheres 122a and 122b facing each other. The front edges of the walls 324 (side surfaces on the side of the arc member members 121a and 121b) face the arc member members 121a and 121b and are orthogonal to the central axes of the arc member members 121a and 121b. It is formed to. For this reason, at the time of opening a small current, the movement to the inside (rear end side of the arc-extinguishing member 120) of the arc I in this small current area is regulated by the front end side side of the wall portion 324. In other words, the front end side surface of the wall portion 324 functions as the arc stop wall 324a which regulates the movement of the arc inward. In other words, arc stop walls 324a are formed in the far corners of both arc-out member passages 121a and 121b, respectively. When the arc I in the small current region stays near the arc stop wall 324a, the arc stop wall 324a is melted by the arc heat to generate the extinguishing decomposition gas.

(Interval holding member)

29 and 30, two arc contact walls 123 located on the outermost side of each arc contact wall 123 on the front and rear surfaces of the arc-out member 12 as in the first embodiment. And the outer edge of the arc member 120 is formed so as to protrude the gap retaining member 124, respectively.

(waist)

29 to 33, the recess 125 is formed by the arc contact wall 123, the space keeping member 124, and the back surface of the arc extinguishing member 120 on the back surface of the arc extinguishing member 120. It is.

(Upper and lower barrier part)

33, the inner grooves 122a and 122b of the extinguishing member 120 pass through the air gaps 127a and 127b to the rear (rear end side) of the extinguishing device 100A. ) Is opened. In the extinguishing member 120, a portion of the rear end side of the thick wall portion 324 is an upper and lower barrier portion 128 to ensure insulation in the vertical direction of each magnetic plate 110. As shown in FIG. 34A, in the upper and lower barrier portions 128, a thick portion 128a is formed on the rear end side of the arc contact wall 123. The thick portion 128a is formed with an inclined surface 128b which becomes smaller toward the rear end side of the extinguishing member 120. This configuration makes it possible to cope with consumption by the arc and to smoothly discharge the extinguishing cracked gas to the rear.

As shown in FIGS. 26 and 27, in the state in which each of the magnetic plates 110 and each of the extinguishing members 120 are supported between the support members 130 and 130, each of the upper and lower barrier portions 128 is magnetic. It protrudes greatly from the trailing edge of the plate 110. This makes it possible to smoothly guide the extinguishing cracked gas at the time of blocking to the rear of the extinguishing device 100A. In addition, the return of the extinguishing cracked gas into the arc extinguishing device 100A can be suppressed, and it can be avoided that the atmosphere between the magnetic layers 110 becomes short-circuited due to the return.

(projection part)

As illustrated in FIG. 26, protruding portions 127 are formed at rear ends of both edges of the extinguishing member 120. In the state where the magnetic plate 110 and the arc extinguishing member 120 are supported between the two supporting members 130 and 130, the protrusions 127 protrude from both edges of the magnetic plate 110, respectively. The protruding length of is set.

(Coupling protrusion)

Coupling protrusions 140 are formed at the front end sides at both edges of the extinguishing member 120. As shown in FIG. 29, the upper surface of the coupling protrusion 140 and the upper surface of the protrusion 127 are formed to be positioned on substantially the same plane, respectively.

(Prevention of separation of the engaging protrusion)

As shown in FIG. 35, in the coupling protrusion 140, side separation preventing protrusions 141 are formed at upper portions of the short side surfaces positioned opposite to each other. In addition, as shown in FIG. 36, in the coupling protrusion 140, an upper anti-separation protrusion is formed on the outer side of the long side surface positioned at the upper side of the long side surfaces positioned on the opposite side (up and down). 142 is formed. When the engaging protrusion 140 is inserted into the support member 134 for the thick member from the inside, the inner surface of the support member 134 for the extinguishing member has a gradient surface 141a of the side detachment preventing protrusion 141 and an upper detachment prevention. Guided to the gradient surface 142a of the protrusion 142. Then, the side departure prevention protrusion 141 and the upper departure prevention protrusion 142 pass through the support hole 134 for the extinguishing member, so that the side departure prevention protrusion 141 and the upper departure prevention protrusion 142 support the member 130. (By coupling to the outer surface of the support part 132, the separation prevention from the support hole 134 for the extinguishing member of the coupling protrusion 140 can be achieved.

(Positional relationship between magnetic plate and extinguishing member)

As shown in FIG. 26, when the arc extinguishing device 100A is viewed in the stacking direction of the arc extinguishing member 120 and the magnetic plate 110, the inner grooves 122a and 122b and the magnetic plate ( The positional relationship between the cutting grooves 112a and 112b of the 110 is as follows. That is, the whole of the cutting grooves 112a and 112b of the magnetic plate 110 is located in the inner grooves 122a and 122b, and a part of the magnetic plate is exposed to the bare corners of the inner grooves 122a and 122b. It is. In addition, the magnetic plate 110 is exposed to the inner side (the front end side of the extinguishing member 120) inside the bare corners in both arc member passages 121a and 121b. For this reason, the arc I generated between the fixed electrode 15 and the movable electrode 21 is constrained to each exposed portion of the magnetic plate 110 in response to the blocking current. That is, the arc I in the high current region and the low current region is constrained in the arc restraint portion γ (described later) of the magnetic plate 110 positioned (exposed) in the far corners in both inner grooves 122a and 122b. do. In addition, the micro current is constrained in the arc fixing part 150 of the magnetic plate 110 positioned (exposed) near the bare corners of both arc member passages 121a and 121b.

(Material of Magnetic Plate)

Next, the material of the magnetic plate 110 will be described in detail.

Conventionally, iron is generally used as a magnetic plate material. The reason for this is that the price is low, the coercive force is low, and it is quite suitable for generating the electromagnetic force at the time of interruption. However, since the steel has low corrosion resistance and rust, it is necessary to plate the surface, and furthermore, it is necessary to consider the problem of tm plating peeling. In particular, ferritic stainless steels represented by SUS430 (Japanese Industrial Standard) are well known as cheap and excellent corrosion resistance materials. However, in this case, the coercive force is so large that it is unsuitable for the switching operation of the switch. Therefore, the present applicant focuses on the contents of chromium (Cr) and carbon (C) forming the material of ferritic stainless steels, and has a roughly equivalent price and magnetic properties (magnetic force) as compared to the characteristics of these materials. Was selected from various ferritic stainless steels. In addition, permalloy (magnetic alloy having a high transmittance mainly composed of nickel and iron) having excellent magnetic properties was excluded from the selection material because of its high price and poor corrosion resistance.

First, in order to determine the contents of chromium (Cr) and carbon (C), the magnetic plates 110 of the same shape are manufactured by samples 1 to 9 having different contents of chromium and carbon, and a small current ( The blocking test of excitation current and charging current (according to Japanese Industrial Standard 4605) described later was performed. In this embodiment, the breaking current was 10 A (amperes). The results are shown in Table 4. In this Table 4, O indicates that blocking is well done, and X indicates that blocking is not performed well.

The test conditions are as follows. In other words, the test electrode structure was a rod-shaped electrode (fixed electrode 15). The movable electrode was made into a narrow contact type by two copper straight blades (contact blades 21a and 21b), and the thickness of the contact blades 21a and 21b was 4 mm. As for the extinguishing device, an airborne magnetic plate type extinguishing device in which four layers of magnetic plates 110 and extinguishing members 120 were alternately stacked was used. The thickness of the magnetic plate 110 was 1 mm, and the height of the extinguishing member 120 was 6.5 mm.

Cr (% by weight) C (% by weight) 10A blocking Sample 1 9.78 0.014 O Sample 2 10.39 0.010 O Sample 3 11.90 0.012 O Sample 4 14.32 0.009 O Sample 5 16.00 0.006 O Sample 6 12.63 0.030 O Sample 7 8.72 0.015 X Sample 8 12.20 0.024 X Sample 9 20.01 0.012 X

From the test results shown in Table 4, when the material of the magnetic plate 110 is set to Samples 1 to 6, it is possible to block the small current arc satisfactorily. When the material of the magnetic plate 110 is made into samples 7 to 9, it is difficult to block the small current arc satisfactorily. Accordingly, the magnetic plate 110 is preferably formed of a ferritic stainless steel containing 9.0 to 16.0% by weight of chromium and 0.006 to 0.030% by weight of carbon. By doing so, it is possible to satisfactorily block the small current arc and the micro current arc, respectively.

As the material of the magnetic plate 110, a particularly small amount of carbon contained in the ferritic stainless steel is preferable. This is because carbon tends to form carbides (for example, chromium carbide) by annealing or the like, and the magnetic properties and the corrosion resistance of the magnetic plate 110 deteriorate as the carbon content increases. Accordingly, in the present embodiment, the magnetic plate 110 is formed of a ferritic stainless steel containing 9.0 to 16.0% by weight of chromium and 0.006 to 0.020% by weight of carbon.

In addition, as shown in Fig. 26, in the present embodiment, the magnetic plate passages 111a and 111b and the extinguishing member passages 121a and 121b constitute a movable electrode passage portion α. The inner grooves 122a and 122b of the arc extinguishing member 120 and the cutout grooves 112a and 112b of the magnetic plate 110 having the width smaller than the movable electrode passing portion α constitute the arc inducing portion β. The portions exposed in the inner grooves 122a and 122b of the extinguishing member 120 among the flat plate portions of the bare corners of the cutouts 112a and 112b of the magnetic plate 110 constitute an arc restraint γ.

(Operation of Embodiments)

Next, the action of the extinguishing device of the switch configured as described above will be described.

In the closing state indicated by the dashed-dotted line in FIG. 25, if the operation handle is operated to open the circuit, the lever 20 rotates clockwise around the rotation shaft 19. At the same time, the drive link 24 is moved upward, and the movable electrode 21 rotates clockwise about the axis 17. When the movable electrode 21 is separated from the fixed electrode 15, between the fixed electrode 15 and the movable electrode 21, that is, between the fixed electrode 15 and both contact blades 21a and 21b, respectively. Arc I (see FIG. 32) occurs.

As shown in FIG. 32, magnetic flux distribution deflected by the presence of the magnetic plate 110 occurs around the arc pillar. Based on the right-handed law and the Fleming's left-handed law, the arc I is always driven to the inside of the magnetic plate 110 (in the direction of the arrow in FIG. 21) by the electromagnetic force generated in the magnetic plate 110, and the two magnetic plates. It is concentrated and fixed inwardly of the incision grooves 112a and 112b via the bare corners of the passages 111a and 111b (see FIG. 26). Arc (I) is attracted in the fixed state concentrated in the bare corners of the incision grooves (112a, 112b) and is segmented by each magnetic plate 110, and the positive, negative cathode drop and cooling effectively The arc voltage rises sharply. If the movable electrode 21 moves to the open position shown by the solid line in Fig. 25, the arc is completely extinguished and the circuit opening operation ends. When the circuit is closed, the operation is performed as opposed to the above-described circuit opening.

(Blocking of large current arc)

Next, the action of the arc extinguishing device 100A in the case of breaking a large current to exceed 30A, for example, will be described.

By arranging the magnetic plates 110 and the arc extinguishing member 120 in the moving direction of the movable electrode 21, the arc I is the upper surface (surface of the upper and lower barrier portions 128 of the arc extinguishing member 120). ) Is further driven to the inside of the magnetic plate 110 while adjoining the bottom surface (back side). In this case, the arc extinguishing gas is generated from the upper and lower surfaces of the upper and lower barrier portions 128 of the extinguishing member 120 and the arc contact wall 123 by the arc heat, and the extinguishing is promoted by the extinguishing decomposition gas.

That is, the large current arc also has strong electron attraction force generated in each magnetic plate 110 having a large energy. For this reason, the arc I of the high current region is not fixed to the arc fixing part 150, but is driven inward of the cutouts 112a and 112b and behind the extinguishing member 120 at a time, Active contact with the upper and lower surfaces. In addition, since the amount of heat generated as compared with a small current arc such as an exciting current and a charging current is also large, the amount of extinguishing decomposition gas generated from the upper and lower surfaces of the extinguishing member 120 is also sufficiently secured. In addition, the arc contact wall 123 and the thick wall portion 324 also contribute to the generation of the arc extinguishing gas.

Since the extinguishing member 120 is formed of a synthetic resin (PFA in this embodiment) containing fluorine, which is a kind of negative atom, negative electrons having a property of easily adsorbing electrons in the arc to the extinguishing decomposition gas generated by the arc heat. Contains a fluorine atom. This fluorine atom adsorbs the electrons in the arc, thereby increasing the extinguishing performance (current blocking performance).

Further, the magnetic plates 110 and the arc extinguishing member 120 are alternately arranged at predetermined intervals in the moving direction of the movable electrode 21, so that carbides are continuously attached between the inner surfaces of the arc extinguishing members 120. Is prevented. For this reason, a continuous carbon screen is not formed in the inner surface of the extinguishing member 120, and deterioration of extinguishing performance is suppressed. Moreover, the recessed part 125 is formed in the back surface of the arc extinguishing member 120, and the creepage distance is fully ensured by the side of the arc extinguishing member 120 by this. Moreover, returning to the side of the arc extinguishing member 120 is suppressed, and generation of the arc I between both sides of each magnetic plate 110 is prevented.

As described above, the extinguishing decomposition gas generated in the extinguishing member passages 121a and 121b (that is, the extinguishing decomposition gas generated from both the upper and lower sides of the upper and lower barrier parts 128 and the arc contact wall 123) is the arc contact wall. Guided to 123 is led to the rear of the extinguishing member 120. Particularly in the case of opening a large current, the arc extinguishing decomposition gas mainly flows behind the magnetic plate 110 and the extinguishing member 120 together with the generation of the arc I. By this arc extinguishing decomposition gas, the arc I is called to the rear of the magnetic plate 110 and the extinguishing member 120, and this arc I is further pulled up and extended. That is, arc extinguishing is promoted by the arc blowing effect by the arc extinguishing decomposition gas flowing to the rear of the magnetic plate 110 and the extinguishing member 120. In addition, since the outer surface of the arc contact wall 123 becomes negative of the arc generating portion, metal vapor or the like contained in the arc extinguishing shard is difficult to adhere to. For this reason, no fouling surface is formed continuously, and the creepage distance between each magnetic plate 110 is ensured.

As shown by the arrows in FIG. 33, the extinguishing cracked gas drawn to the rear of the extinguishing member 120 is guided to the rear of the extinguishing device 100A via a largely open gap S (see FIG. 31). The extinguishing cracked gas is guided laterally from the opening 123b formed not only behind the extinguishing member 120 but also inside the arc contact wall 123, and then discharged backward. For this reason, the discharge of the arc extinguishing gas is performed smoothly, the arc extinguishing gas is smoothly guided to the rear of the arc extinguishing device 100A without remaining, and inside the arc extinguishing device 100A, a new atmospheric gas. (Air) is introduced.

As a result, the insulation resistance of an atmosphere is high behind the inner side grooves 122a and 122b of the arc extinguishing device 100A, and contributes to extinguishing. Moreover, the magnetic plate 110 is cooled by the newly introduced atmospheric gas (air), and the extinguishing is accelerated. Once the extinguishing performance has been demonstrated, the extinguishing cracking gas contains metal vapor or free carbon and causes re-ignition, but the extinguishing cracking gas is rapidly removed from the magnetic plate 110 and the extinguishing member 120. Is derived to the rear. In addition, insulation recovery is attained by replacing the atmosphere inside the arc extinguishing device 100A with a new atmosphere gas (air), and re-ignition is prevented.

(Blocking of small current arc)

Next, the operation of the arc extinguishing device 100A in the case of blocking a small current of 30 A or less, for example, a charging current and an exciting current, will be described.

As shown in FIG. 26, since the entire magnetic plate passages 111a and 111b are exposed in the arcing member passages 121a and 121b, the arc I does not interfere with the arcing member 120. Due to the suction action of the centrifugal force accompanying the rotation of the movable electrode 21 and the electromagnetic force generated in the magnetic plate 110, the magnetic plate 110 (strictly, magnetic plate passages 111a and 111b) is smoothly inward. Is driven. In addition, since the widths of the cutouts 112a and 112b are smaller than the widths of the magnetic plate passages 111a and 111b, the electromagnetic suction force stronger than the magnetic plate passages 111a and 111b in the cutouts 112a and 112b. This occurs, and the exciting current arc and the charging current arc are sucked into the cutouts 112a and 112b.

The energy of the arc I in the small current region is smaller than the large current arc energy, and the amount of extinguishing cracked gas generated at the time of interruption is lower than at the time of large current opening. However, the arc I in this small current region is quickly moved by the arc inducing portion β to the arc restraining portion γ located in the far corner of the arc extinguishing device 100A. It is fixed. That is, the arc restraint γ becomes an arc spot. Arc resistance from the thick wall portion 324 (see FIG. 33) and the thick portion 128a of the arc extinguishing member 120 in which the arc I in the small current region is positioned around the arc restraint portion γ. Emission of cracked gas is performed smoothly. The extinguishing cracking gas pressure in the inner grooves 122a and 122b of the extinguishing member 120 is increased by adding the extinguishing cracking gas generated in the arc restraint γ to the extinguishing cracking gas generated in the arc inducing part β. Increases. The arc I is extinguished by the contact of the arc I in the low current region with the pressure-extinguishing extinguishing decomposition gas.

(Blocking micro current arc)

Next, the operation of the arc extinguishing device 100A in the case of interrupting the microcurrent of 5 A or less in the small current region, for example, will be described.

The microcurrent arc has a very small energy and a small electromagnetic force generated in each magnetic plate 110. For this reason, as the blocking element, the microcurrent arc is formed inside the magnetic plate 110 (strictly the cutting grooves 112a and 112b) due to the centrifugal force accompanying the rotation of the movable electrode and the magnetic flux generated in the magnetic plate 110. Is driven smoothly. In this case, there is also the assistance of the wind pressure generated by the movement of the blower member 33 in the open direction in the drive link 24, and the arc I in the microcurrent range is the arc extinguishing device 100A (movable electrode passing section). (α)) inward. The arc I in this small current region is fixed in the arc fixing part 150 while the movement inward of the arc stopping wall 324a is restricted. For this reason, the arc fixation time is secured in the bare corners of the arc extinguishing member passages 121a and 121b (periphery of the arc fixing part 150). As a result, the contact time between the arc I in the small current region and the arc stop wall 324a is secured, and the extinguishing decomposition gas is stably generated from the arc stop wall 324 even in the small current arc with low energy. . Furthermore, the breaking characteristic of 100 A of arc extinguishing apparatuses is stabilized.

Such extinguishing cracked gas does not stay in the inner grooves 122a and 122b of the extinguishing member 120, and is quickly guided laterally from the opening 123b formed inside the arc contact wall 123, and the extinguishing device ( 123 is discharged to the outside from the rear (see FIG. 33). For this reason, it is suppressed that old anti-corrosive decomposition gas containing metal vapor etc. stays inside the extinguishing member passages 121a and 121b and the inner grooves 122a and 122b, and the new extinguishing performance is always high. Gas is supplied. For this reason, replacement of an arc extinguishing gas is made smoothly, and reignition is suppressed.

Thus, according to the arc extinguishing device 100A of this embodiment, the shortening of the interruption time with respect to the arc I of a microcurrent range is aimed at. In addition, the generation of stable electromagnetic force is secured over a wide range from the large current range to the small current range, and the breaking performance is improved.

(Effect of 3rd Embodiment)

(1) In the corners of the magnetic plate passages 111a and 111b, the cutout grooves 112a and 112b having a width smaller than those of the magnetic plate passages 111a and 111b are formed so that the fixed electrode 15 and An arc inducing portion β is formed to guide the arc I generated between the movable electrodes 21 inward. Moreover, on the inner extension line of the arc induction part (beta), the arc restraint part (gamma) which fixes the arc I guide | induced by this arc induction part (beta) was provided. For this reason, it is possible to effectively generate | occur | produce an arc extinguishing gas with respect to the arc I of a low current area especially at the time of small current interruption. Furthermore, it is possible to complete the interruption of the small current quickly.

Further, an arc barrier wall 324a orthogonal to the arcing member passages 121a and 121b is formed in the far corners of the arcing member passages 121a and 121b, and further inward from the center of the arc stopping wall 324a. Arc grooves 122a and 122b are formed to face each other. In the vicinity of the arc stop wall 324a of the arc extinguishing member 120, the magnetic plate 110 is exposed inward, that is, within the arc extinguishing member passages 121a and 121b. For this reason, in the microcurrent interruption, due to the lack of arc energy, the arc I in the microcurrent region is regulated by the arc stop wall 324a, and the arc fixing part 150 is controlled inward. Is bound to. For this reason, the arc I of the microcurrent region stays around the arc stop wall 324a of the arc extinguishing member 120, and the contact time of this arc I and the arc extinguishing member 120 is ensured. Generation of the arc extinguishing gas is actively promoted, and arc (I) in the microcurrent region is extinguished by the arc extinguishing gas.

Further, in the arc contact wall 123, an opening 123b was formed on the inner side, and the extinguishing member passages 121a and 121b were opened laterally. For this reason, the extinguishing decomposition gas in the periphery of the arc stop wall 324a is smoothly discharged to the side of the extinguishing member 120 (armor apparatus 100A) via the opening 123b. The retention of the arc extinguishing gas around the arc contact wall 123 is suppressed, and fresh arc extinguishing gas is supplied around the arc contact wall 123. Thereby, it is possible to quickly extinguish the arc I in the small current region where the driving force to the inside of the arc extruding apparatus 100A is small.

(2) The magnetic plate 110 was formed of a ferritic stainless steel containing 9.0 to 16.0% by weight of chromium and 0.006 to 0.020% by weight of carbon. For this reason, a stable ferrite single phase structure is obtained, and the magnetic properties of the magnetic plate are improved. Thereby, it is possible to improve the breaking performance of the arc I in the small current region and the small current region, respectively. In addition, by containing chromium, the magnetic plate 110 is excellent in the corrosion protection effect.

Generally, iron is used as a magnetic material. However, in this case, plating processing against rust is necessary. In addition, it is necessary to consider the peeling problem of the plating by the arc heat. In the present embodiment, as a magnetic material, a ferritic stainless steel material having an antirust effect on the material itself and excellent in the generation of electromagnetic force is used. For this reason, the plating process to the magnetic plate 110 is not necessary and the peeling powder of plating by arc heat does not need to be considered.

(3) The drive link 24 is operatively connected to the movable electrode 21, and the movable electrode 21 is configured to approach or move away from the fixed electrode 15 by driving the drive link 24. In addition, the movable electrode passage portion α configured to allow the movable electrode 21 to pass through the magnetic plate passages 111a and 111b and the arc extinguishing member passages 121a and 121b. Then, in the movable electrode passing portion α of the drive link 24, the arc I generated between the movable electrode 21 and the fixed electrode 15 at the time of opening the circuit is pressed into the movable electrode passing member. Blowing member 33 was to be installed. For this reason, the blowing member 33 according to the circuit opening operation | movement of the drive link 24 moves upwards. As a result, the wind pressure is generated in the direction in which the arc I is pushed into the movable electrode passing portion α. By this wind pressure, the driving force to the inside of the movable electrode passage part (alpha) of a microcurrent arc is supplemented, for example. Further, stabilization of the microcurrent arc can be achieved, and the breaking performance can be stabilized. It is also possible to improve the blocking performance.

(4) The blower member 33 was formed integrally with the drive link 24. In addition, the in-phase barrier 32 is integrally formed in the drive link 24. For this reason, it is possible to reduce the parts score. In addition, the space is efficiently used in the main body case 12.

(5) An inclined surface 131a is formed on the upper surface of the base 131. The lower surface of the edge part (protrusion part 127 mentioned later) of the arc-extinguishing member 120 of the lowest layer is in close contact with this inclined surface 131a. The front edge of the lower extremity arc extinguishing member 120 is close to the rear side of the base 131. As a result, leakage from inside the arc extinguishing device 100A of the arc extinguishing gas is suppressed. For this reason, the surface of the support member 130 is fouled by the extinguishing decomposition gas leaked to the outside of the extinguishing device 100A so that the projection 113 of the magnetic plate 110 does not have the same potential, and the support member ( On the surface of 130, the arc I conducts between the protrusions 113, and there is no impossibility of blocking.

(6) Moreover, the insulating wall 135 was formed in the inner surface of the base 131. This insulating wall 135 was provided so as to overlap (that is, overlap) the protrusion 127 of the arc extinguishing member 120 of the lowermost layer. Thereby, it is possible to further suppress leakage from the inside of the arc extinguishing device 100A of an arc extinguishing gas.

(7) Both supporting members 130 and 130 were arranged on the front side of the extinguishing device 100A (opening side of the movable electrode passing part α), respectively. For this reason, arc extinguishing of the arc I is performed smoothly.

(8) On the side of the extinguishing member, an installation coupling protrusion 140 is installed, and a disengagement preventing means of the coupling protrusion 140 is installed at the tip of the coupling protrusion 140. Specifically, in the front-rear direction of the engaging projection 140, the upper part of the short side surface located on the opposite side to each other

Side separation preventing protrusions 141 were formed, respectively. In addition, in the up and down direction of the coupling protrusion 140, the upper departure preventing protrusion 142 is formed near the outer side of the long side surface located at the top of the two long side surfaces located opposite to each other. For this reason, the side detachment preventing protrusion 141 and the upper detachment preventing protrusion 142 are formed on the surface of the supporting member 130 only by inserting the engaging protrusion 140 into the support hole 134 for the extinguishing member of the supporting member 130. In the periphery of the support hole 134 for the arc extinguishing member, the separation prevention from the support member 130 of the engaging projection 140 is planned.

(9) After inserting the magnetic plate 110 and the projection 113 into the magnetic plate support hole 133 of the support member 130, the projection of the magnetic plate 110 is positive from the outside of the support member 130. The plastic deformation of the magnetic plate 110 can be prevented from coming off the support member 130 of the magnetic plate 110. For this reason, it is not necessary to provide the separation prevention structure of the protrusion 113 of the magnetic plate 110 separately. Thus, the configuration is not complicated.

(Example)

In addition, the third embodiment may be modified by the following other examples.

As shown in Fig. 40, the slit wall 151 may be formed by extending the arc contact wall 123 of the lowermost arc-out member 120 downward. In this way, when the circuit is opened, the contact blades 21a and 21b are sandwiched between the slit walls 151, respectively, so that the slit effect can be obtained, and the breaking performance can be further improved.

Each slit wall 151 constitutes a slit-thinning means provided at the peripheral edge of the extinguishing member passages 121a and 121b in the extinguishing member 120 of the lowermost layer of the extinguishing member 120.

In addition, as shown in FIG. 40, in the lowermost arc extinguishing member 120, the covering wall 152 is formed by extending downward the gap holding member 124 on the lower surface side, and this covering wall 152 ) May cover the inner surface of the base 131 of the support member 130. By doing in this way, the contamination of the inner surface of the base 131 is suppressed.

In the third embodiment, one insulation wall 135 is provided on one side, but as shown by the dashed-dotted line in FIG. 30, two, three or more insulation walls 135 are provided in each group. Also good. In this case, the creepage distance to the side in the extinguishing member 120 can be ensured.

In the third embodiment, the arc contact walls 123b are opened laterally by forming the openings 123b in the arc contact walls 123, but the arc contact walls 123 may be omitted. good. In the arc extinguishing member 120, a portion between the arc extinguishing member passages 121a and 121b may be arranged. In other words, there is only one arcuate member passage. Even in this way, the old extinguishing cracked gas containing metal vapor or the like is guided to the side of the extinguishing member passage. And since new arc extinguishing decomposition gas is always supplied, it is possible to improve the breaking performance.

In the third embodiment, one opening 123b is provided in one arc contact wall 123, but two, three or more openings 123b are provided in one arc contact wall 13. May be formed. Even in this way, the extinguishing cracked gas can be moved laterally.

-In the third embodiment, the blower member is formed integrally with the drive link, but may be a separate member that allows the blower member and the drive link to be assembled together.

In the third embodiment, the blower member 33 is provided in the drive link 24, but the movable electrode 21 itself may be provided. Even in this case, the induction of the arc into the inner leg of the movable electrode passing portion α is promoted by the wind pressure generated by the movement of the blowing member provided in the movable electrode itself.

In the third embodiment, the magnetic plate 110 and the arc extinguishing member 120 are alternately arranged in the moving direction of the movable electrode 21, but may be as follows. That is, the magnetic plate type extinguishing device may be configured by omitting each arcing member 120 and arranging the plurality of magnetic plates 110 at regular intervals in the moving direction of the movable electrode 21. In this case, the magnetic plate passages 111a and 111b of each magnetic plate 110 constitute the movable electrode passing portion α. The movable electrode 21 passes through the movable electrode passing portion α in the direction orthogonal to the magnetic plates 110. In addition, as the material of the magnetic plate 110, a magnetic material having a low carbon content as a representative composition is selected. Specifically, the magnetic plate 110 is formed of a ferritic stainless steel containing 9.0 to 16.0% by weight of chromium (Cr) and 0.006 to 0.020% by weight of carbon (C). Even in this way, for example, magnetic properties of the magnetic plate 110 are ensured as compared with the magnetic plate type extinguishing device constituted by the magnetic plate formed of the iron material. In addition, by containing chromium, it is possible to secure the corrosion resistance of the magnetic plate 110. For this reason, it is possible to improve the interruption | blocking performance of the arc I in a small current range and a small current range.

-In the third embodiment, the blower member 33 is formed integrally with the drive link 24, but may be as follows. In other words, the blower member 33 is a member separate from the drive link 24. Then, the blower member 33 is formed of flexible synthetic resin material (including rubber material), and the blower member 33 is movable at its proximal end (driving link 24 fixed side) in accordance with driving of the movable electrode. The electrode 21 may be bent in a direction opposite to the moving direction of the electrode 21. In this case, the blowing member 33 bent in accordance with the drive of the drive link 24 is elastically returned to its original position (original state) with a time difference. For this reason, compared with the case where only the blowing member 33 is moved upward according to the drive of the drive link 24, the wind pressure produced by this blowing member 33 becomes high. Further, the arc I in the small current region and the small current region is pushed into the one-layer arc extinguishing device 100A.

-In the third embodiment, the arc extinguishing device 100A is used for the double blade type single point switchgear 11, but it may be used for the single blade type single point switchgear. In this case, the arc extinguishing device 100A is disposed at the inner ends of the power supply side bushing 13 and the load side bushing 14, respectively, and the movable electrodes made of two or one Z-shaped contact blades are rotated with respect to the both extinguishing devices. The structure which opens and closes with respect to the fixed electrode of two positions was employ | adopted. Even in this case, the effect similar to (1)-(9) in this embodiment can be acquired.

In the third embodiment, the fixed electrode 15 and the arc extinguishing device 100A are provided at the inner end of the power source side bushing 13 and the movable electrode 21 is rotatably supported at the inner end of the load side bushing 14. However, you may do as follows. That is, the fixed electrode 15 and the arc extinguishing device 100A may be provided at the inner end of the power source side bushing 14. Even in this case, the effect similar to (1)-(9) in this embodiment can be acquired.

According to the present invention, the arc extinguishing performance can be improved to arc extinguish not only a large current region but also a small current region.

According to the present invention, a significant shortening of the interruption time with respect to the arc in the small current range is realized, and stable generation of electromagnetic force is ensured in a wide area from the large current range to the small current range, thereby improving the breaking performance. It is possible to let.

Claims (25)

A magnetic plate formed of a magnetic material and having a magnetic plate passage through which a movable electrode can pass, and a synthetic resin material which is insulative and generates arc extinguishing gas by contact with an arc, and is capable of passing through the movable electrode. An arc extinguishing device having passages arranged in an alternating direction of a movable electrode, the movable electrode being separated from the fixed electrode at the time of opening the circuit, and allowing the magnetic plate passage and the arc extinguishing member passage to pass sequentially. A movable electrode passage portion configured to allow the movable electrode to pass through the magnetic plate passages and the arc extinguishing member passages; In the bare corners of the magnetic plate passage, an incision groove having a width smaller than that of the magnetic plate passage is formed, and an arc induction portion for inducing an arc generated between the fixed electrode and the movable electrode at the time of opening the circuit from each of the incision grooves is provided. On the extension line of the arc induction part is provided an arc constraining part for fixing the arc guided by this arc induction part, And a cutout corner groove having a width smaller than that of the extinguishing member passage in the bare corner of the extinguishing member passage, and each arc cutting groove exposes the arc guide portion and the arc constraining portion of each magnetic plate, respectively. The method according to claim 1, And a creepage distance increasing structure that secures creepage distances from the sides of the extinguishing member on opposite edges of the extinguishing member passage. The method according to claim 1 or 2, A fire extinguishing device for opening the incision corner groove of the extinguishing member toward the corner of the extinguishing member. The method according to claim 3, The arc holding member is provided with a gap retaining member for maintaining a constant interval between the magnetic plate, The creepage distance increasing structure is a main portion formed of the wall member and the surface of the extinguishing member formed along the passage of the arcing member at the edges facing each other of the arcing member passage, and the rear surface and the spacing retaining member, And a space keeping member to set the height of protruding height from the surface and the back surface of the extinguishing member such that the surface and the back surface of the wall member and the extinguishing member do not contact the magnetic plate, respectively. The method according to claim 1, An arc extinguishing device having a protrusion protruding from an edge of the magnetic plate at the edge of the extinguishing member. The method according to claim 1, And a magnetic plate passage formed at the inner edges of the magnetic plate passages facing each other such that portions corresponding to the movable electrodes are parallel to each other at least when passing through the magnetic plate passages. The method according to claim 1, A fire extinguishing device in which a width of the cut groove is set within a range of 0.5 to 2 mm. The method according to claim 1, A fire extinguishing device having a width of the incision groove of 1.5 mm or less. The method according to claim 1, And a pressure chamber for retaining the extinguishing cracking gas in the far corner of the extinguishing member passage. The method according to claim 9, And a plurality of pressure chambers. The method according to claim 1, And a movement inhibiting structure for suppressing the movement of the extinguishing decomposition gas toward the opening of the extinguishing member in the middle of the arcing member passage. The method according to claim 1, And the arcing member and the magnetic plate are formed and arranged such that d1 &lt; d3 &lt; d2 when the magnetic plate thickness is d1, the arcing member thickness is d2, and the arranging interval of the arcing member is d3. A pair of bushings which are penetrated and supported on the inner wall of the main body case for each phase, fixed electrodes provided at the inner end of one bushing, and rotatably provided at the inner end of the other bushing to contact and leave the fixed electrodes. A switch comprising: a movable electrode according to claim 1 and an arc extinguishing device according to claim 1 provided at the inner end of the one bushing. Soho, which is formed of a magnetic material and has a magnetic plate passage through which the movable electrode can pass, and a synthetic resin material which is insulative and generates arc extinguishing gas by contact with the arc, and has a arcing member passage through which the movable electrode can pass. An arc extinguishing device in which members are alternately arranged in a moving direction of a movable electrode, and the movable electrode away from the fixed electrode sequentially passes through the magnetic plate passage and the extinguishing member passage in opening the passage. An arc induction part is formed in the far corner of the magnetic plate passage by forming an incision groove having a width smaller than that of the magnetic plate passage, and an arc restraint portion is installed in the bare corner of the arc induction portion to fix the arc guided by the arc induction portion. and, An arc stop wall is formed in the bare corner of the arc-member passage, orthogonal to the arc-member passage, and a cut corner groove is formed so as to be directed further to the corner from the center of the arc stop wall and parallel to the cut-out groove. And a portion of the magnetic plate exposed to the inside of the incision corner groove and the extinguishing member passage in the corner of the corner groove and the arc stop wall, and to open the extinguishing member passage or the incision corner groove laterally. The method according to claim 1 or 14, An arc extinguishing device in which the magnetic material is formed of a ferritic stainless steel material containing 9.0 to 16.0% by weight of chromium and 0.006 to 0.020% by weight of carbon. The method according to claim 1 or 14, And the magnetic plate and the arc extinguishing member are supported between the pair of support members, and the support members are installed on the opening side of the movable electrode passageway. The method according to claim 16, And the support member includes a base fixed to the fixed electrode, and a support part supporting the magnetic plate and the arc extinguishing member, wherein the extinguishing member of the lowermost layer is brought into close contact with an upper surface of the base. The method according to claim 16, An arc extinguishing device having a single or a plurality of insulating walls formed on an inner surface of the base and overlapping the insulating wall with the lowermost extinguishing member. The method according to claim 16, An attachment engaging projection is provided on the side of the arcing member, and the engaging projection is inserted into the extinguishing member support hole formed in the supporting member from the inside so as to support the arcing member between the two supporting members. A extinguishing device provided with a disengagement prevention means at the distal end. The method according to claim 1 or 14, An arc extinguishing device, wherein a microscopic arc extinguishing means is provided at a circumferential edge of the extinguishing member passage in the extinguishing element of the lowermost layer of each extinguishing member. The method according to claim 1 or 14, A subarray holding means is provided on the side of the extinguishing member for holding the upper and lower spaced intervals of the magnetic plate and the extinguishing member, and the lower inner extinguishing member of each extinguishing member covers the inner surface of the base of the supporting member with the spacing holding means. Device. A power side bushing and a load side bushing, which are penetrated to face each side wall of the main body case, and a fixed electrode provided at an inner end of the power side bushing, and rotatably provided at an inner end of the load side bushing. In the switchgear having a movable electrode corresponding to detachable contact, An extinguishing device according to claim 14 is provided at an inner end of the power side bushing, A driving link is operatively connected to the movable electrode, and the movable electrode is detached from the fixed electrode by driving the driving link. A movable electrode passage portion configured to allow the movable electrode to pass through each of the magnetic plate passages and each of the extinguishing member passages, and between the movable electrode and the fixed electrode at the opening side of the movable electrode of the drive link or the movable electrode itself. A switch for installing a blower for inserting the arc generated in the movable electrode passage portion. The method according to claim 22, Switch for forming the blower member and the drive link integrally. delete delete

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