WO2013186909A1 - Limiteur de surtension à éclateur - Google Patents

Limiteur de surtension à éclateur Download PDF

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Publication number
WO2013186909A1
WO2013186909A1 PCT/JP2012/065314 JP2012065314W WO2013186909A1 WO 2013186909 A1 WO2013186909 A1 WO 2013186909A1 JP 2012065314 W JP2012065314 W JP 2012065314W WO 2013186909 A1 WO2013186909 A1 WO 2013186909A1
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WO
WIPO (PCT)
Prior art keywords
resin
arc
spark gap
discharge
gap arrester
Prior art date
Application number
PCT/JP2012/065314
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English (en)
Japanese (ja)
Inventor
幸二郎 加藤
滋 西澤
野澤　俊博
内野　雅俊
Original Assignee
合資会社シーエスディ
株式会社白山製作所
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Application filed by 合資会社シーエスディ, 株式会社白山製作所 filed Critical 合資会社シーエスディ
Priority to PCT/JP2012/065314 priority Critical patent/WO2013186909A1/fr
Priority to PCT/JP2012/080349 priority patent/WO2013186951A1/fr
Priority to JP2014521194A priority patent/JP6002766B2/ja
Publication of WO2013186909A1 publication Critical patent/WO2013186909A1/fr

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01T—SPARK GAPS; OVERVOLTAGE ARRESTERS USING SPARK GAPS; SPARKING PLUGS; CORONA DEVICES; GENERATING IONS TO BE INTRODUCED INTO NON-ENCLOSED GASES
    • H01T1/00—Details of spark gaps
    • H01T1/02—Means for extinguishing arc
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01T—SPARK GAPS; OVERVOLTAGE ARRESTERS USING SPARK GAPS; SPARKING PLUGS; CORONA DEVICES; GENERATING IONS TO BE INTRODUCED INTO NON-ENCLOSED GASES
    • H01T4/00—Overvoltage arresters using spark gaps
    • H01T4/10—Overvoltage arresters using spark gaps having a single gap or a plurality of gaps in parallel
    • H01T4/12—Overvoltage arresters using spark gaps having a single gap or a plurality of gaps in parallel hermetically sealed

Definitions

  • the present invention relates to a spark gap arrester that is installed in a low-voltage power supply circuit and that bypasses lightning current to the ground and discharges it in order to protect electronic devices that are sensitive to overvoltage during lightning strikes.
  • Patent Document 1 As a spark gap arrester that can safely discharge lightning current by bypassing it to the ground, the one shown in Patent Document 1 is known.
  • FIG. 7 shows the configuration of the spark gap arrester disclosed in Patent Document 1.
  • reference numeral 10 denotes a spark gap arrester, and all parts are arranged in a rotationally symmetric structure with respect to the central axis.
  • the pair of discharge electrodes 11 a and 11 b of the arrester 10 are opposed to each other while maintaining a certain discharge gap G by the cylindrical insulator 12.
  • the size of the discharge gap G determines the discharge voltage.
  • Lead conductors 17a and 17b are drawn out from the discharge electrodes 11a and 11b, and the arrester 10 is connected to an electric circuit to be protected through these lead conductors.
  • the arrester 10 When a high-voltage lightning impulse voltage induced in the electric circuit is applied to the arrester 10, the arrester 10 generates a discharge that starts from a spark discharge at the discharge gap G between the discharge electrodes 11a and 11b and shifts to an arc discharge. Absorbs lightning impulse voltage.
  • the large-current arc discharge causes rapid ionization and expansion in the air in the internal space S of the arrester 10, but the cylindrical insulator 13, the insulating plates 14a and 14b, and the insulating caps 15a and 15b surrounding the discharge electrodes 11a and 11b.
  • the outer side of the insulating case is covered with a metal pipe 16 and its upper and lower ends are firmly closed by curling, so that it does not explode or break even if the internal pressure exceeds several tens of atmospheres.
  • the lightning impulse current has a short duration of 1 ms or less and the heat capacity of the metal parts is sufficiently large, so that an excessive temperature rise does not occur due to the discharge of this current.
  • FIG. 8 is a longitudinal sectional view showing the configuration of the spark gap arrester 20 disclosed in Patent Document 2. As shown in FIG. All the components are constructed and arranged in rotational symmetry.
  • the conventional spark gap arrester 20 in FIG. 8 has a pair of discharge electrodes 21a and 21b arranged in a cylindrical metal case 28 so as to face each other while maintaining a predetermined discharge gap G.
  • Each discharge electrode is configured by joining tip portions 23a and 23b made of a copper tungsten alloy having excellent heat resistance and arc resistance to the tips of base portions 22a and 22b made of a copper material.
  • the pair of discharge electrodes is fixedly supported in the metal case 28 via the insulator 24, the insulating plates 26a and 26b, and the insulating caps 27a and 27b.
  • the size of the discharge gap G can be easily set by adjusting the thickness of the insulator 24 sandwiched between the discharge electrodes 21a and 21b.
  • a plurality of arc-extinguishing plates 29 (ai) made of magnetic metal rings are arranged so as to be insulated from each other at a predetermined interval.
  • the discharge generated between the discharge electrodes 21a and 21b is initially generated in the arc discharge path A extending between the tip portions 23a and 23b of both electrodes.
  • arc-extinguishing gas is released from the insulating ring 25 made of an organic arc-extinguishing insulating material disposed between both electrodes due to the heat of the arc. Due to the pressure of this gas and the electromagnetic force between the magnetic arc extinguishing plate 29 and the arc current, the arc of the arc discharge path A is moved in the direction of the arc extinguishing plate 29 and the arc discharge path B spreads over the entire arc extinguishing plate 29. Move. Arc discharge and anode voltage drop occur on both sides of each arc extinguishing plate 29 in the arc discharge path B.
  • the anode and cathode voltage drop in the arc discharge path B is (n + 1) ⁇ (U A + U K )
  • the continuity of the current flowing from the AC power supply circuit immediately before the lightning impulse current disappears forms an arc through the same path as the discharge path of the lightning impulse current, but the instantaneous value of the voltage of the AC power supply circuit is When the voltage is lower than the counter electromotive voltage, the continuity is interrupted and the arc discharge disappears.
  • this conventional spark gap arrester 20 also has the following two drawbacks. (1) Since the insulating ring 25 that generates the arc-extinguishing gas when the arc is generated is disposed inside the discharge electrode, the amount of arc-extinguishing gas generated is small. Accordingly, the force for moving the arc to the arc extinguishing plate becomes insufficient, and the arc extinguishing performance is deteriorated due to insufficient arc moving distance. (2) When a magnetic material such as pure iron is used for the arc extinguishing plates 29a to 29i, the lightning impulse current is an extremely large current of 20 kA or more, and the rising speed is as extremely high as 2 kA / ⁇ s or more. The arc extinguishing plate is melted and evaporated by the arc current, so that the function of the arc extinguishing plate is lowered and the life of the arrester is shortened.
  • an object of the present invention is to provide a spark gap arrester having an enclosed structure by sufficiently generating an arc extinguishing gas at the time of occurrence of a discharge so that an arc caused by a lightning impulse current is reliably moved into the arc extinguishing plate.
  • An object of the present invention is to provide a spark gap arrester having a long lifetime by increasing the melting and evaporation of the arc extinguishing plate due to lightning impulse current.
  • the invention according to claim 1 is a spark gap arrester comprising a pair of discharge electrodes having a truncated cone or a columnar shape opposed to each other with a space inside a cylindrical metal case.
  • a plurality of metal arc extinguishing plates formed of a conductive sintered alloy formed by mixing and sintering one or more high melting point metals and one or more low melting point metals between a pair of discharge electrodes are predetermined. It is characterized by being spaced apart.
  • the invention of claim 2 is characterized in that, in the invention of claim 1, the sintered alloy forming the metal arc extinguishing plate is characterized in that the low melting point metal is copper and the high melting point metal is tungsten.
  • the invention of claim 3 is the same as the resin insulator of the invention of claim 1 or 2, similarly to the resin insulator formed of an insulating resin that generates an arc extinguishing gas by heating between the pair of discharge electrodes.
  • a resin interval body composed of a composite with a resin conductor formed of a conductive resin that generates an arc extinguishing gas by heating is disposed, and one of the discharge electrodes and the resin conductor portion of the resin interval body It is characterized in that a layer of the resin insulator part of the resin spacer forming an insulating discharge gap is interposed therebetween.
  • the end face of the pair of discharge electrodes facing each other is connected to one end made of a resin insulator and the other end made of a resin conductor.
  • the depth of the recessed portion of the discharge electrode on one end, which is configured by the resin insulator of the resin interval body, and the resin insulator of the resin interval body inserted into the recess The dimension of the discharge gap is defined by the difference with the thickness of the configured insulator on one end side.
  • the space around the pair of discharge electrodes is partitioned by a partition wall made of an insulating material to form a plurality of spaces.
  • a partition wall made of an insulating material to form a plurality of spaces.
  • One of them is an arc chamber and the other is an expansion chamber, and these chambers are connected to each other by a gas passage.
  • a resin conductor portion constituting the resin interval body in the arc chamber provided in the space between the pair of discharge electrodes, a resin conductor portion constituting the resin interval body is provided.
  • the metal arc extinguishing plate is disposed so as to be accommodated and opposed to the conductor portion.
  • the invention of claim 7 is the invention according to any one of claims 1 to 6, wherein the plurality of metal arc-extinguishing plates are kept spaced from each other by an insulating ring inserted inside the metal case, and The metal case is electrically insulated and fixed.
  • An invention according to claim 8 is the ring according to any one of claims 1 to 7, wherein a tip is bent into a hook shape on the inner periphery of a part of the insulating ring inserted inside the metal case.
  • An annular protrusion having a groove is provided.
  • the invention according to claim 9 is the invention according to any one of claims 1 to 8, wherein the insulating resin that generates arc-extinguishing gas by heating is a composite resin containing an inorganic reinforcing material. .
  • the insulating resin that generates an arc extinguishing gas by heating is a polyoxymethylene (POM) resin, and the arc extinguishing by the heating.
  • the conductive resin that generates the reactive gas is a resin in which carbon powder is mixed with the polyoxymethylene (POM) resin.
  • a metal arc extinguishing plate arranged in a space between a conical frustum or a pair of cylindrical discharge electrodes arranged between a low melting metal powder and a high melting metal
  • the metal arc extinguishing plate can be reduced in wear even if it is exposed to arc discharge caused by lightning impal current, and the life of the arrester is extended. can do.
  • FIG. Sectional drawing which shows typically the structure of the sintered alloy board which comprises the metal arc-extinguishing board used for this invention.
  • the diagram which shows the voltage-current characteristic of the arc discharge used for operation
  • the cross-sectional view which follows the VV line of Fig.4 (a). It is a block diagram which shows the 2nd Example of this invention, (a) is a longitudinal cross-sectional view, (b) is the elements on larger scale which expand and show the A section in (a).
  • reference numeral 30 denotes a spark gap arrester, which includes a pair of discharge electrodes 31a and 31b accommodated in a cylindrical insulating case 33 at a predetermined interval.
  • the spacing between the electrodes 31a and 31b is maintained by a circular resin spacing member 32 inserted therebetween.
  • the resin spacer 32 includes, for example, an arc extinguishing resin insulator 32a formed of a resin that generates an arc extinguishing gas at a high temperature, such as a polyoxymethylene resin called POM, and the polyoxymethylene. It is composed of a composite resin in which an arc extinguishing resin conductor 32b formed of a resin which is made conductive by adding conductive carbon powder to the resin is integrally formed. For this reason, as for the resin space
  • the arc-extinguishing resin conductor 32b is an arc-extinguishing resin. It has an arc extinguishing gas generation function exactly the same as that of the insulator 32a.
  • the resin spacing member 32 is formed in a columnar shape by joining the arc extinguishing resin insulator 32a and the arc extinguishing resin conductor 32b formed in a substantially semi-cylindrical shape to each other in a plane portion (FIG. 1). (See (a)).
  • a thin semi-disc-shaped protrusion 32c protruding in the radial direction of the resin spacer 32 is formed in the middle of the arc-extinguishing resin insulator 32a, and the outer peripheral surface of the protrusion 32c is the arc-extinguishing resin conductor. It extends to the outer peripheral surface of 32b and is exposed in the arc chamber 36a (see FIG. 1B).
  • the upper and lower surfaces of the protruding portion 32c are divided bodies 3 that are divided above and below the arc-extinguishing resin conductor 32b disposed on each surface. Conductive coupling with the discharge electrodes 31a and 31b through 2b-1 and 32b-2, respectively.
  • the thickness of the protrusion 32c forms a discharge gap G between the discharge electrodes 31a and 31b. For example, if the size of the discharge gap G is selected to be 0.3 mm, a lightning impulse of about 2 kV between the discharge electrodes 31a and 31b. When a voltage is applied, the insulation of the discharge gap G is broken and a flash (spark discharge) is generated.
  • the internal space of the cylindrical insulating case 33 enclosing the discharge electrodes 31a and 31b and the resin spacer 32 is a boundary portion between the insulator 32a and the conductor 32b of the resin spacer 32 and is similar to the resin spacer 32.
  • Two spaces are formed which are partitioned by insulating partition walls 35a and 35b in the radial direction made of arc-extinguishing insulating resin.
  • One of the two spaces is an arc chamber 36a and the other is an expansion chamber 36b.
  • the insulating partition walls 35a and 35b are provided with vent holes 35h and 35h, respectively, so that both chambers communicate with each other. Therefore, the expansion chamber 36b absorbs an excessive increase in internal pressure due to the arc in the arc chamber 36b. It works to suppress the pressure rise.
  • the arc-extinguishing resin conductor 32b of the resin interval body 32 is accommodated, and the arc-extinguishing resin insulator 32a is accommodated in the expansion chamber 36b.
  • the arc chamber 36a includes a plurality of conductive materials having a shape in which an annular flat plate is partially cut away from the outer peripheral surface of the arc extinguishing resin conductor 32b and the protrusion 32c of the arc extinguishing resin insulator 32a.
  • Metal arc extinguishing plates 37a to 37e are arranged to face each other.
  • the metal arc extinguishing plates 37a to 37e are composed of conductive sintered alloy plates formed by sintering one or more types of low melting point metal powders and one or more types of high melting point metal powders, and are spaced apart from each other by a certain distance. And is held by the insulating case 33.
  • the sintered alloy forming the arc extinguishing plate 37 for example, a sintered alloy containing 20% by weight of copper as a low melting point metal and 80% by weight of tungsten as a high melting point metal can be used.
  • the normal working voltage of the electrical circuit of the protected facility to which the arrester is connected is a low voltage of about 100 to 400V.
  • the withstand voltage between the pair of discharge electrodes 31a and 31b is several kV due to the discharge gap G between the edge portions of the arc extinguishing resin conductor 32b facing each other across the protruding portion 32c of the insulator 32a of the resin spacer 32. Therefore, when a normal operating voltage is applied between the pair of discharge electrodes 31a and 31b, the insulation of the discharge gap G is maintained and no discharge occurs.
  • a high-voltage lightning impulse voltage is induced in the electric circuit of the electric circuit by a lightning strike or the like, and the divided conductors 32b-1 facing each other with the protrusion 32c of the insulator 32a of the resin interval body 32 between the discharge electrodes 31a and 31b interposed therebetween.
  • a lightning impulse voltage of several kV or more which is equal to or higher than the withstand voltage of the discharge gap G, is applied between the upper and lower edges of 32b-2, the insulation of the discharge gap G is broken and a flash (spark discharge) is generated.
  • a large amount of arc extinguishing gas is generated from the surface of the arc extinguishing resin conductor 32b heated to a high temperature by the arc of the discharge path B, and the discharge path between the pair of discharge electrodes is generated by the pressure of the gas.
  • the arc of B is pushed and moved to the central part of the metal arc extinguishing plates 37a to 37e, and a discharge path C indicated by a dotted line is formed.
  • the arc is divided by the plurality of metal arc extinguishing plates 37a to 37e, and the arc voltage rises due to a negative and anode voltage drop of about 30V generated between the arc extinguishing plates.
  • the arc voltage U A is provided with five arc extinguishing plates 37, so that the cathode and anode voltage drops of the discharge electrodes 31a and 31b are added thereto.
  • the arc voltage between the pair of discharge electrodes 31a and 31b rises, and after the lightning impulse current disappears, the internal air in the arc chamber 36b is ionized, so that the continuity flows from the power supply circuit.
  • the instantaneous value of the power supply circuit voltage applied between the pair of discharge electrodes 31a and 31b is reduced to 180 V or less, and this is ensured. Can be blocked.
  • the metal arc extinguishing plate 37 is formed by sintering a low melting point metal that melts at a relatively low temperature, such as copper powder, and a high melting point metal that does not melt up to a high temperature, such as tungsten powder. Since it is made of a sintered alloy, the amount of melting and evaporation due to lightning impulse current is extremely small, and wear of the arc extinguishing plate is reduced.
  • FIG. 2 is a metal structure diagram schematically showing a longitudinal section of an arc extinguishing plate made of a sintered alloy of a low melting point metal and a high melting point metal.
  • the metal structure of the arc extinguishing plate has a structure in which a large number of tungsten particles W of high melting point metal are bonded to each other by high-temperature firing, and the void portion is filled with copper particles Cu of low melting point metal. It has become.
  • the arc extinguishing plate of the present invention composed of a sintered alloy composed of a metal having a relatively high melting point and a metal having a relatively low melting point reduces wear even when contacting the arc, and keeps the life of the arrester long. be able to.
  • spark gap arrester according to the present invention are shown in FIGS. 4 to 6 and will be described below.
  • FIG. 4 is a longitudinal sectional view showing the structure of the spark gap arrester 40 of this embodiment.
  • FIG. It is a cross-sectional view along line V.
  • the constituent elements are configured and arranged in rotational symmetry with respect to the axis.
  • the arc extinguishing plate 47 has a shape obtained by cutting a part of an annular flat plate at a predetermined arc angle as shown in a plan view in FIG. 5, and does not have a rotationally symmetric configuration.
  • the pair of discharge electrodes 41a and 41b includes base portions 41a-2 and 41b-2 made of a copper material which is a normal conductor, and copper having excellent heat resistance and arc resistance coupled to the tips of the base portions. It comprises tip portions 41a-1 and 41b-1 made of tungsten alloy chips.
  • the base portions 41a-2 and 41b-2 and the tip portions 41a-1 and 41b-1 are integrated without performing troublesome processing such as brazing by press-fitting the base portion into a recess provided in the tip portion. ing.
  • the tip portions 41a-1 and 41b-1 of the discharge electrodes 41a and 41b are formed in a truncated cone shape in the first embodiment, but may be formed in a columnar shape instead.
  • the pair of discharge electrodes 41a and 41b have a constant facing distance by a resin interval body 42 formed by integrally joining an arc extinguishing resin insulator 42a and an arc extinguishing resin conductor 42b sandwiched therebetween. Retained.
  • the discharge electrodes 41a and 41b are formed of insulating caps 43a and 43b and an insulating plate having elasticity in an insulating case formed by connecting and connecting insulating rings 44a to 44f divided into a plurality of parts. 44j and 44k.
  • the insulating case constituted by the insulating cylinder 44 and the like is fitted by a metal case 45 made of a metal pipe from the outside.
  • the metal case 45 is strong by bending the upper and lower ends inward by curling and applying clamping pressure in the axial direction to the flange portions 41a-3 and 41b-3 of the discharge electrode base portions 41a-2 and 41b-2.
  • a pressure-resistant structure is configured.
  • arc extinguishing plates 47a to 47c are arranged at intervals. These arc extinguishing plates 47a to 47c are fixedly supported by being fitted into annular grooves 44g to 44i formed by connecting and connecting the insulating rings 44b to 44d forming the insulating cylinder 44. These arc extinguishing plates 47 (a to c) are formed of a sintered alloy containing at least one kind of low melting point metal such as copper and one or more high melting point metals such as tungsten, as described above.
  • the resin interval body 42 is formed by an arc extinguishing resin insulator 42a and is exposed at the upper end portion and almost half of the outer periphery. And the lower end part and the remaining half part of the outer periphery are formed by the arc extinguishing resin conductor 42b and exposed.
  • the upper end portion of the resin spacer 42 is fitted and coupled to the tip portion 41a-1 of the upper discharge electrode 41a, and the lower end portion is fitted and coupled to the tip portion 41b-1 of the lower discharge electrode 41b.
  • the upper end portion of the resin insulator 42a of the resin interval member 42 joined to the tip end portion 41a-1 of the upper discharge electrode 41a is exposed at the entire periphery, and is exposed to the outer peripheral surface side where the resin conductor 42b of the resin interval member 42 is exposed.
  • the thickness g of the portion to be determined determines the insulating discharge gap G between the tip portion 41a-1 of the upper discharge electrode 41a and the resin conductor 42b of the resin spacer 42.
  • FIG. 4B shows an enlarged view of the portion A in FIG. 4A including the discharge gap G.
  • the thickness g of the portion exposed to the resin conductor is determined by the difference between the thickness t and the depth d of the recess 41a-6. Since the thickness g automatically determines the size of the insulating discharge gap G between the electrodes, it is only necessary to determine the size of the resin spacer 42 and the discharge electrode tip 41a-1 and assemble the other parts. There is no need to adjust the position.
  • the lead conductor When pulling out the lead conductor from the discharge electrode bases 41a-2 and 41b-2 to the outside, the lead conductor (not shown) is coupled and screwed to the screw holes 41a-4 and 41b-4 for coupling the lead conductor provided in the external lead portion. Can be pulled out.
  • the space around the resin interval body 42 in the insulating cylinder 44 is a pair of radii that protrudes inwardly facing the inner periphery of the divided insulating rings 44a to 44f constituting the insulating cylinder 44. Divided into two spaces by direction partition walls 44p, 44q.
  • the space that accommodates the arc extinguishing resin conductor 42b and the arc extinguishing plates 47 (47a to 47c) of the resin interval member 42 is an arc chamber 46a, and the space that accommodates the other resin insulator 42a is the expansion chamber 46b.
  • the arc chamber 46a and the expansion chamber 46b are formed in spaces 46c and 46d and partition walls 44p and 44q formed between the discharge electrode tip portions 41a-1 and 41b-1 and the base portions 41a-2 and 41b-2.
  • the air holes 44t and 44u communicate with each other.
  • exhaust passages 41a-5 and 41b- leading to the outside are connected to the base portions 41a-2 and 41b-2 of the discharge electrodes. 5 is provided.
  • a pair of discharge electrodes 41a and 41b of the arrester 40 are electrically connected between the electric circuit of the electric circuit to be protected from lightning voltage and the ground.
  • the withstand voltage of the insulation discharge gap G (see FIG. 4B) is set to several kV, which is sufficiently higher than the normal operating voltage of a low voltage of about 100 to 400V, for example. In this case, the insulation of the discharge gap G is maintained and no discharge occurs.
  • the internal air of the arc chamber 46a is ionized by the arc discharge, so that the arc extends between points a and c of the pair of discharge electrodes 41a and 41b, and the arc-extinguishing resin conductor of the resin spacer 42 is obtained. Run on the exposed surface of 42b.
  • the surface of the arc extinguishing resin conductor 42b of the resin interval 42 is heated to a high temperature, and a large amount of arc extinguishing gas is generated from the surface of the resin conductor 42b.
  • the arc that is pushed by the pressure of the arc extinguishing gas and runs on the surface of the resin conductor 42b is moved to the center of the arc extinguishing plates 47a to 47c.
  • the total shadow and anode voltage drop U A generated between the pair of discharge electrodes 41a and 41b are the shadow of the three arc extinguishing plates and the anode voltage drop because the shadow of the pair of discharge electrodes and the anode voltage drop are added.
  • the arc voltage of the arc path without the arc extinguishing plate changes depending on the arc current as shown by the characteristic line B in FIG. 3, but the arc voltage of the arc path including the arc extinguishing plate is applied to the arc extinguishing plate. Due to the shadow and anode voltage drop that occurs, as shown by the characteristic line A in FIG. For this reason, even if the lightning impulse current exceeds the peak value and enters the decay process, the arc voltage is kept substantially constant, so the lightning impulse current becomes substantially zero, and the instantaneous value of the power supply voltage becomes smaller than the arc voltage. When this occurs, the continuity from the power circuit is interrupted, the arc disappears, and the arrester insulation is restored.
  • the metal of the discharge electrode and the arc extinguishing plate is evaporated and scattered by the heat of the arc, and the metal oxide adheres to the inner surface of the insulating cylinder 44, whereby a pair of discharge electrodes An electrical bypass circuit is formed between them, and the insulation resistance between the discharge electrodes decreases.
  • annular shape in which tip portions are bent inwardly on the inner periphery of the insulating rings 44a and 44f at both ends forming the insulating cylinder 44.
  • the annular grooves 44m and 44n are formed in which the metal oxide evaporated and scattered from the electrode or the like does not enter.
  • the metal oxide melted and evaporated from the discharge electrode and the metal arc extinguishing plate by the arc is reduced, so that the metal oxide layer adhering to the inner surface of the insulating cylinder 44 is here.
  • the decrease in insulation resistance between the pair of discharge electrodes can be prevented for a long period of time.
  • the insulating rings 44a to 44f constituting the outer walls of the arc chamber 46a and the expansion chamber 46b are formed of an insulating resin, there is a possibility that they are damaged by a large internal pressure applied when the arc is generated. In order to prevent this, it is preferable to increase the mechanical strength by adding an inorganic reinforcing material such as glass fiber to the insulating resin.
  • the metal arc extinguishing plate 47 of Example 1 is also obtained by sintering a low melting point metal that melts at a relatively low temperature, for example, copper powder and a high melting point metal that does not melt to a high temperature, for example, tungsten powder. Since it is composed of the formed sintered alloy, the synergistic function of the low melting point metal and the high melting point metal, as in the embodiment of FIG. Since the wear of the plate can be reduced, the life of the arrester can be extended.
  • the structure of the upper end portion of the resin insulator 42a and the upper electrode tip portion 41a-1 of the resin interval body 42 that maintains the interval between the pair of discharge electrodes 41a and 41b is improved. is there.
  • Example 1 the thickness g of the exposed portion of the spacer and the resin insulator forming the discharge gap G is fitted to the depth d of the fitting recess 41a-6 provided in the upper electrode tip 41a-1.
  • the structure is determined based on the difference from the thickness t of the fitting portion at the upper end portion of the resin insulator 42a.
  • Example 2 the thickness of the exposed portion of the resin insulator 42a between the upper electrode tip 41a-1 and the upper end of the exposed portion of the resin conductor 42b of the resin interval 42 is shown.
  • the size of the insulating discharge gap G is uniquely determined by g.
  • the protrusion 42a-1 of the resin insulator 42a of the resin spacer 42 is fitted into the fitting hole 41a of the upper electrode tip portion 41a-1.
  • the resin spacer 42 is coupled to the upper electrode tip 41a-1, but the recess 41a-6 of the upper electrode tip 41a-1 for determining the size of the insulation gap G, and the resin insulator 42a
  • the fitting convex part to a recessed part is not provided.
  • the thickness of the exposed portion of the outer peripheral surface between the upper electrode tip portion 41a-1 of the resin insulator 42a of the resin spacer 42 and the upper end of the resin conductor 42b of the resin spacer 42 can be easily defined.
  • 40 Spark gap arrester, 41a, 41b: Discharge electrode, 42: Resin spacer, 42a: Resin insulator, 42b: Resin conductor, 43a, 43b: Insulation cap, 44 (44a to 44f): Insulating cylinder (split insulation) Ring), 46a: arc chamber, 46b: expansion chamber, 47 (47a to 47c): metal arc extinguishing plate.

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Abstract

La présente invention vise à fournir un limiteur de surtension à éclateur comportant une structure fermée dans laquelle : une efficacité de gaz d'extinction d'arc est améliorée par la génération de gaz d'extinction suffisant lors de la génération de décharge électrique et entraînant le déplacement de l'arc provoqué par le courant de surtension de coup de foudre d'une manière fiable à l'intérieur d'une plaque d'extinction d'arc ; et dans laquelle la fusion et l'évaporation de la plaque d'extinction d'arc provoquées par le courant de surtension de coup de foudre sont réduites en vue d'accroître la durée de vie utile du limiteur de surtension à éclateur. À cet effet, la présente invention concerne un limiteur de surtension à éclateur dans lequel une pluralité de plaques métalliques d'extinction d'arc sont disposées avec un intervalle prédéterminé entre elles, lesdites plaques métalliques d'extinction d'arc étant formées à partir d'un alliage fritté conducteur obtenu par le mélange et le frittage d'un métal ou de plusieurs métaux ayant une haute température de fusion avec un métal ou des métaux ayant une basse température de fusion entre une paire d'électrodes de décharge. Les électrodes de décharge sont disposées de manière à être en face l'une de l'autre avec un intervalle entre elles à l'intérieur d'un boîtier métallique de forme cylindrique, et forment un cône tronqué circulaire ou une conformation de pilier rond.
PCT/JP2012/065314 2012-06-15 2012-06-15 Limiteur de surtension à éclateur WO2013186909A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
PCT/JP2012/065314 WO2013186909A1 (fr) 2012-06-15 2012-06-15 Limiteur de surtension à éclateur
PCT/JP2012/080349 WO2013186951A1 (fr) 2012-06-15 2012-11-22 Dispositif d'arrêt d'espace d'étincelage
JP2014521194A JP6002766B2 (ja) 2012-06-15 2012-11-22 火花ギャップアレスタ

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CN110223810B (zh) * 2019-06-12 2020-08-25 西南交通大学 一种自熄弧装置
CN110336131B (zh) * 2019-06-18 2021-01-19 中国舰船研究设计中心 船载短波通信系统直击雷防护装置及其防护评估方法
CN210201155U (zh) * 2019-06-20 2020-03-27 王嬿蕾 一种多管反冲熄灭电弧等离子体的结构

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JPS5562617A (en) * 1978-11-06 1980-05-12 Tokyo Shibaura Electric Co Arc extinguishing device
JPS63241893A (ja) * 1987-03-30 1988-10-07 株式会社東芝 スパ−クギヤツプスイツチ
JP2003272465A (ja) * 2002-03-18 2003-09-26 Sumitomo Electric Ind Ltd 直流リレー
WO2005074084A1 (fr) * 2004-02-02 2005-08-11 Csd Co., Ltd. Dechargeur-eclateur

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JPS6070702A (ja) * 1983-09-26 1985-04-22 株式会社日立製作所 防爆形酸化亜鉛避雷器

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Publication number Priority date Publication date Assignee Title
JPS5562617A (en) * 1978-11-06 1980-05-12 Tokyo Shibaura Electric Co Arc extinguishing device
JPS63241893A (ja) * 1987-03-30 1988-10-07 株式会社東芝 スパ−クギヤツプスイツチ
JP2003272465A (ja) * 2002-03-18 2003-09-26 Sumitomo Electric Ind Ltd 直流リレー
WO2005074084A1 (fr) * 2004-02-02 2005-08-11 Csd Co., Ltd. Dechargeur-eclateur

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