KR101494790B1 - Arc extinguishing unit for solid insulated switchgear - Google Patents

Abstract

An object of the present invention is to provide an SOHO device of a solid insulated switchgear which can alleviate the electric field concentration between the energizing path and the ground terminal inside the SOHO section in the state of ground cutoff and main circuit energization, The sooting device of the solid insulated switchgear according to the invention comprises: a soffit enclosure formed of a solid insulating material; And a second fixed contact electrically connected to the power-source-side connecting conductor. The first fixed contact is electrically connected to the power-source-side connecting conductor. The second fixed contact is electrically connected to the power- And a movable blade (BLADE) rotatable in a first position in contact with the second fixed contact and in a second position in contact with the second fixed contact; And a second outer portion of the small-diameter portion enclosure in which the first fixed contact is installed in the small-diameter portion enclosure and a second outer portion in which the movable blade in the second position is located in the small- And a semi-conductive covering layer which is covered and grounded to an external portion of the small-diameter portion enclosure, which selectively includes only the first external portion and the second external portion.

Description

{ARC EXTINGUISHING UNIT FOR SOLID INSULATED SWITCHGEAR}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a solid insulated switchgear, and more particularly, to a small-sized insulated switchgear of a solid insulated switchgear which can be safely operated by the grounding of the outside of a small-diameter unit of a pole of a solid insulated switchgear.

Switchgears In particular, multi-circuit switchgears for underground lines are used for the functions of line division, branching and load opening / closing for the underground distribution system (underground distribution system with voltage of 22.9 kV) among the transmission and distribution power systems, Is a switchgear having a function of disconnecting the corresponding power circuit from the power system by detecting occurrence of fault current such as short-circuit current on the side (power source side) and load side.

In such a switchgear, the solid insulated switchgear has a structure in which the main circuit portion capable of opening and closing the line side (power supply side) and the load side power circuit and the ground switch are housed in one small-diameter portion enclosure made of solid insulation material .

This configuration example can be referred to the contents disclosed in Korean Patent Registration No. 10-1100710 (title of the invention: circuit breaker for underground distribution line) registered by the applicant of the present invention.

The configuration of the solid insulated switchgear will be described with reference to FIGS. 1 and 2. FIG.

1, the solid insulated switchgear 100 is broadly divided into a common operating mechanism 10, a soffit device 20, an upper connecting connector 30, a voltage transformer 40, 50). In Fig. 1, reference numeral 60 denotes an elbow connector.

2, reference numeral 21b designates a load-side bushing of a small-diameter portion enclosure made of a solid insulating material included in the SOHO device 20, reference numeral 27 designates a power transmission link mechanism, To connect the load side power line to the load side bushing 21b. Here, the elbow connector 60 is a connector in which a conductor for electrical connection is embedded in an electrical insulating material shell. The conductor in the elbow connector 60 is a load side connecting conductor buried in the load side bushing 21b 25). ≪ / RTI >

The common operation mechanism 10 is a means commonly connected to a main circuit breaker and a ground breaker, which will be described later, to provide an opening / closing driving force for circuit opening / closing to the main circuit breaker and the ground breaker. The common actuator 10 converts an electric drive source such as a motor and / or a hydraulic cylinder or a manual drive source of a user's manual power into an open / close drive force for opening and closing a circuit of the actuator, The detailed structure and operation of the actuator are disclosed in Korean Patent Registration No. 10-0186357 (entitled " automatic contact operation mechanism of 3-position multi-circuit breaker ") registered by the applicant of the present invention The detailed description will be omitted.

The switch 20 is a so-called so-called part, and three switches are provided for each three-phase (three-pole) AC. Three solid-insulated switchgears 100 are provided for each of the four branch circuits. .

The upper interconnect joist 30 is provided with three conductive interconnect members for three phases (three poles) for electrically connecting the same phase (poles) in the soot control unit 20 for each branch circuit, Extends in the longitudinal direction of the switchgear (100), and is installed to be electrically and mechanically connected to the lower portion of the SOHO device (20). The details and the operation of the phase connection connector 30 can refer to the publication of Korean Patent Registration No. 10-0789446 (entitled " a plurality of solid insulated load open / close period electrical connection devices ") registered by the applicant of the present invention. The technique will be omitted.

A voltage transformer 40 is connected to any one of the phase connection plugs 30 and transforms a voltage of the phase connection plug 30 so as to be connected to a controller (Not provided with a code). The configuration and operation of the connection to the voltage transformer 40 are disclosed in Korean Patent Registration No. 10-0928933 (entitled " Solid Insulation Load Breaker " and Voltage Transformer Connection Device for Solid Insulation Load Break Switch) registered by the applicant of the present invention The detailed description will be omitted.

The support frame 50 is a supporting means for supporting the components of the solid insulated switchgear 100 and can be constituted by a plurality of horizontal frames and vertical frames.

Further, in such a solid insulated switchgear, a technique has been proposed in which a semi-conductive covering layer is applied to the outside of a component to be solid-insulated and the semi-conductive covering layer is grounded to protect a user who can contact the outside.

2, reference numeral 21b denotes a load-side bushing portion to be described later, and reference numeral 27 denotes a bushing portion provided on the common operation mechanism 10 And a power transmitting mechanism for transmitting the opening and closing driving force to the soot processor 20.

FIG. 3 shows a technique of applying and covering the entire outer surface of the outer casing of the SOH apparatus 20, that is, the entire outer surface of the SOH unit with a semi-conductive coating layer (SCC) according to the prior art.

However, if the entirety of the outside of the small-size enclosure is coated with the semi-conductive clad layer (SCC) and grounded as described above, it is possible to prevent the ground cutoff between the energizing path inside the small- An electric field is concentrated on the substrate.

In order to alleviate the electric field concentration, it is necessary to increase the space distance and the surface distance between the energizing path and the ground terminal. This increases the size of the soot portion, so that it is impossible to miniaturize the size of the switchgear.

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-mentioned problems of the prior art, and it is an object of the present invention to reduce the electric field concentration between the energizing path and the ground terminal in the inside of the small- And to provide an SOHO device of a solid insulated switchgear which is not required.

It is an object of the present invention to provide a solenoid valve device of a solid insulated switchgear,

Side bushing portion for burying the load-side connecting conductor, and a receiving body portion for filling the inside with air; a soho portion enclosure formed of a solid insulating material;

And is installed in the receiving body portion of the small-sized outer casing so as to be insulated from the air,

A first fixed contact which is grounded,

A second fixed contact electrically connected to the power source side connection conductor,

A grounding switch having a movable blade (BLADE) rotatable at a first position in contact with the first stationary contactor and a second position in contact with the second stationary contactor; And

A first outer portion of the small-diameter portion enclosure in which the first fixed contact is installed and a second outer portion in which the movable blade in the second position is located inside the small-diameter portion enclosure, And a semi-conductive covering layer which is covered and grounded to an external portion of the small-diameter portion enclosure selectively including only the first external portion and the second external portion, . ≪ / RTI >

According to a preferred aspect of the present invention, the semi-conductive coating layer is formed on the outer side of the outer side of the outer side bushing portion of the small- Side bushing portion and the power-source-side bushing portion.

According to another preferred aspect of the present invention, the semi-conductive coating layer is formed on the outer side of the outer portion of the small-diameter portion of the small-diameter portion, except for the first outer portion of the small- Side bushing portion and the rear base portion of the load-side bushing portion.

According to another preferred aspect of the present invention, the semi-conductive coating layer is formed only on a portion of the outer portion of the outer portion of the outer portion of the outer portion of the outer portion, which has a vertical region such as the first outer portion of the outer portion.

The apparatus for soaking the solid insulated switchgear according to the present invention comprises a first outer portion of the soot unit enclosure provided with a first fixed contact to be grounded and a first outer portion of the soot unit enclosure, Since the semiconducting layer is selectively formed on either one of the second external portions where the movable blade at the second position is located, that is, the outside of the energizing path, the first fixed contact and the second fixed contact It is possible to alleviate the concentration of the electric field between the moving blades, and there is no need to increase the size of the soot portion, thereby making it possible to miniaturize the solid insulated switchgear.

 In the SOHO device of the solid insulated switchgear according to the present invention, the semi-conductive covering layer may be formed in the outer portion of the SOHO portion enclosure, except for the first outside portion of the SOHO portion enclosure where the first stationary contactor is installed, Side bushing portion and the power-side bushing portion. Therefore, when the movable blade is located at the second position, only the outer-casing portion (second outer portion) of the live conductor portion is coated with the anti- The concentration of the electric field between the first fixed contacts and the live conductor can be relieved in the inside of the small-diameter portion enclosure, so that it is not necessary to increase the size of the small-size portion, and the miniaturization of the solid insulation switchgear can be achieved.

In the SOHO device of the solid insulated switchgear according to the present invention, the semi-conductive covering layer may be formed in the outer portion of the SOHO portion enclosure, except for the first outside portion of the SOHO portion enclosure where the first stationary contactor is installed, It is possible to alleviate the electric field concentration between the first stationary contactor and the live conductor in the inside of the small-diameter portion enclosure, and it is not necessary to increase the size of the small-size portion by forming the cover only in the second external portion and the rear base portion of the load- There is an effect that the size of the solid insulated switchgear can be reduced.

In the SOHO device of the solid insulated switchgear according to the present invention, since the semi-conductive covering layer is formed only on a portion of the outer portion of the SOH part enclosure that has the same vertical height as the first outer part of the SOH part enclosure, It is possible to mitigate the concentration of the electric field between the first fixed contacts and the live conductor in the sub-enclosure, and thus it is not necessary to increase the size of the sub-sub-unit, thereby making it possible to miniaturize the solid insulated switchgear.

1 is a perspective view showing the outline of a general solid insulated switchgear,
FIG. 2 is a longitudinal sectional view showing the internal configuration of the solid insulated switchgear of FIG. 1,
3 is a front view of the SOHO device showing the configuration of the semi-conductive coating layer in the SOHO device of the solid insulated switchgear according to the prior art,
FIG. 4 is a longitudinal sectional view of the SOHO device showing the internal configuration of the SOHO device, which is the ground input position (first position) in the SOHO device of the solid insulated switchgear according to the present invention,
FIG. 5 is a longitudinal sectional view of the SOHO apparatus showing the internal configuration of the SOHO apparatus, which is the ground cutoff position (second position) in the SOHO apparatus of the solid insulated switchgear according to the present invention,
6 is a front view showing a configuration of a soot unit enclosure in a soot unit of a solid insulated switchgear according to the first embodiment of the present invention,
FIG. 7 is a front view showing the configuration of the SOHO unit enclosure in the SOHO unit of the solid insulated switchgear according to the second embodiment of the present invention, and FIG.
FIG. 8 is a front view showing the configuration of the SOHO unit enclosure in the SOHO unit of the solid insulated switchgear according to the third embodiment of the present invention. FIG.

The above and other objects, features and advantages of the present invention will become more apparent from the following detailed description of the present invention when taken in conjunction with the accompanying drawings.

4 to 8, the SOHO device 20 of the solid insulated switchgear according to the preferred embodiment of the present invention includes a SOHO enclosure 21, a ground switch 24, And conductive coating layers (SCC1, SCC2, SCC3).

The small-diameter portion enclosure 21 includes a power-side bushing portion 21c, a load-side bushing portion 21b, and a receiving body portion 21a.

4, the power supply side bushing portion 21c is a portion formed by molding a solid insulating material such as epoxy or silicone into a cone shape, and the power supply side bushing portion 21c And the power source side connecting conductor 23 is buried therein. A power supply side power cable (not shown) may be connected to the power supply side bushing portion 21c.

4, the load side bushing portion 21b is a portion formed by molding a solid insulating material into a cone shape in the same manner as the power supply side bushing portion 21c, The load side connecting conductor 25 is embedded in the inside of the connecting portion 21b.

The accommodating body portion 21a is formed as an inner wall portion of the soot portion housing 21 and is filled with air. The accommodating body portion 21a includes a ground switch 24 and a vacuum interrupter 22 as a main circuit switch, .

The earthing switch 24 is provided for each phase of the AC three phases and installed in the receiving body portion 21a of the small-diameter portion enclosure 21 so as to be insulated from air.

The earthing switch 24 includes a first fixed contact 24a, a second fixed contact 24b, and a movable blade (BLADE) 24d.

The first fixed contact 24a is composed of an electrical conductor fixedly mounted on an upper portion of the receiving body portion 21a of the small-diameter portion enclosure 21 and is grounded. The first fixed contacts 24a are provided with a plurality of opposing conductive plates (not shown) provided so as to be separated from each other so as to be able to come in contact with the movable blades 24d to be described later, (Not shown) that is elastically supported and is in direct contact with the movable blade 24d.

The second fixed contact 24b is composed of an electric conductor fixedly positioned at a lower portion of the receiving body portion 21a of the small-diameter portion enclosure 21 and is electrically connected to the power-source-side connecting conductor 23. [ The second fixed contact 24b is also provided with a plurality of opposed conductive plates (not shown) separated from each other so as to be able to contact the movable blades 24d, which will be described later, And a contact protrusion (not shown) composed of a conductive piece elastically supported and in direct contact with the movable blade 24d.

The movable blade 24d is rotatable in a first position, that is, a ground position in contact with the first fixed contact 24a, and a second position in which it contacts the second fixed contact 24b, i.e., And an electrically conductive plate.

A first outer portion of a small-diameter portion enclosure 21 in which a first fixed contact 24a is provided inside the small-diameter portion enclosure 21 and a second outer portion of the movable blade 20 in a second position inside the small- (SCC1, SCC2, SCC3) of the SOH2 enclosure (21), which selectively includes either the first outer region or the second outer region, It is covered and grounded to the outside area.

According to the first preferred embodiment of the present invention, as shown in Fig. 6, the semi-conductive coating layer SCC1 according to the first embodiment has the first fixed contacts Side bushing portion 21b and the power-source-side bushing portion 21c except for the first external portion of the small-diameter portion enclosure 21 in which the power-side bushing portion 24a is provided.

According to a second preferred embodiment of the present invention as shown in Fig. 7, the semi-conductive coating layer SCC2 according to the first embodiment is formed of a first fixed contact Side bushing portion 21b except for the first outer portion of the small-diameter portion enclosure 21 in which the first-side bushing portion 21a and the second-side bushing portion 21b are provided.

8, according to a third preferred embodiment of the present invention, the semi-conductive coating layer SCC3 according to the third embodiment is formed in such a manner that a portion of the outer surface of the small- Is formed only on the portion having the same vertical height as the first external portion of the first electrode 21.

4, reference numeral 24e denotes a conductor rotating support base for rotatably supporting the movable blade 24d, 22 denotes a vacuum interrupter constituting the main circuit breaker, 22-1a denotes a vacuum interrupter 22 24c is a flexible wire connector having one end connected to the opening and closing drive shaft of the vacuum interrupter 22 and the other end connected to the second fixed contact 24b and is formed of an electrical conductor, Reference numeral 26 denotes a means for electrically connecting the load side connecting conductor 25 and the conductor pivotal support base 24e as a conductor connecting member, and numeral 28 denotes a support base fixedly supporting the second fixed contact 24b.

Hereinafter, the operation and effect of the SOHO device of the solid insulated switchgear according to the preferred embodiment of the present invention will be described with reference to the drawings.

A power from an actuator that is a drive source of a vehicle is transmitted through a power transmitting mechanism not shown in the figure such as a link mechanism for transmitting the power of the actuator to the movable blade 24d, When the movable blade 24d is rotated to come into contact with the first fixed contact 24a, the bead unit 20 of the solid insulated switchgear according to the preferred embodiment of the present invention is at the first position, that is, the ground position .

A conduction path from the load side connecting conductor 25 to the first fixed contact 24a grounded via the conductor interconnector 26, the conductor rotation support base 24e and the movable blade 24d is formed, The remaining charging current flows to the ground and is discharged.

A power from an actuator that is a drive source of a vehicle is transmitted through a power transmitting mechanism not shown in the figure such as a link mechanism for transmitting the power of the actuator to the movable blade 24d, When the movable blade 24d is rotated to contact the second fixed contact 24b, the bead unit 20 of the solid insulated switchgear according to the preferred embodiment of the present invention is moved to the second position, that is, It becomes the turn-on location of the main circuit.

Therefore, the conductor connecting member 26, the conductor rotating support base 24e, the movable blade 24d, the second fixed contact 24b, the twisted wire connecting member 24c, the vacuum interrupter 22, The current path to the power source side connecting conductor 23, that is, the main circuit is closed, and the current can flow from the power source side to the load side.

Here, opening and closing of the main circuit can be performed by an opening / closing mechanism which is not shown for opening / closing the vacuum interrupter 22.

On the other hand, as shown in Fig. 4, when the movable blade 24d is in the first position, the conductor pivot support base 24e and the first fixed contact 24a are connected and grounded by the movable blade 24d And the electric connection path 25 (i.e., the connection conductor 25, the conductor rotation support base 24e, the movable blade 24d, the second fixed contact 24b, the twisted wire connection 24c, the contact portion 22-1a And the ground terminal, that is, the first fixed contact 24a are electrically connected to each other, so that electric field concentration phenomenon does not occur between them.

6 and 8, when the movable blade 24d is in the second position as shown in Fig. 5, the operation and effect of the SOHO device of the solid insulated switchgear according to the preferred embodiment of the present invention Explain.

The soot inserting device of the solid insulated switchgear according to the present invention comprises a first outer portion of a soot portion enclosure 21 provided with a first fixed contact 24a to be grounded, Conductive coating layers SCC1, SCC2, SCC3, SCC3, SCC3, SCC3, SCC3, SCC3, SCC3, SCC3, SCC3, SCC3, The electric field concentration between the first stationary contact 24a and the movable blade 24d at the second position can be mitigated inside the small-diameter portion enclosure 21. As shown in FIG. Therefore, there is no need to increase the size of the SOHO device 20, and the size of the solid insulation switchgear can be reduced.

 6, the semiconducting overcoat layer SCC1 according to the first embodiment has a structure in which the first fixed contacts 24a (see FIG. 6) among the external portions of the small- Side bushing portion 21b and the power-side bushing portion 21c except for the first outer portion of the small-sized outer casing 21 on which the power-side bushing portion 21a is provided, Conductive cover layer SCC1 is formed only on the outer enclosure portion (second outer portion) of the live conductor portion when the movable blade 24d is located, so that the first fixed contact 24a and the on- It is possible to alleviate the electric field concentration between the conductors, that is, the movable blades 24d, so that it is not necessary to increase the size of the SOHO device 20, thereby making it possible to miniaturize the solid insulation switchgear.

7, the semi-conductive coating layer SCC2 is formed on the outer surface of the outer surface of the small-diameter portion of the first fixed contact 24a, By covering only the second outer portion and the rear base portion of the load side bushing portion 21b except for the outer portion, the first fixed contact and the live conductor, that is, the operation in the second position It is possible to alleviate the electric field concentration between the blades 24d, and it is not necessary to increase the size of the soot portion, thereby achieving the miniaturization of the solid insulated switchgear.

8, the semi-conductive coating layer SCC3 may be formed on a portion of the external portion of the small-diameter portion enclosure 21 that has the same vertical height as the first external portion, as shown in FIG. 8, The concentration of the electric field between the first fixed contact 24a and the live conductor 24d, that is, the movable blade 24d, can be relaxed within the small-section enclosure 21, so that the size of the small- There is an effect that the size of the solid insulated switchgear can be reduced.

100: Solid insulated switchgear 10: Common operating mechanism
20: SOHO apparatus 21: SOHO unit enclosure
24: grounding switch 24a: first fixed contact
24b: second fixed contact 24d: movable blade (BLADE)
30: phase connection connector 40: voltage transformer
50: support frame 60: elbow connector
SCC1, SCC2, SCC3: Semi-conductive coating layer

Claims (4)

A soho unit of a solid insulated switchgear,
Side bushing portion for burying the load-side connecting conductor, and a receiving body portion for filling the inside with air; a soho portion enclosure formed of a solid insulating material;
And is installed in the receiving body portion of the small-sized outer casing so as to be insulated from the air,
A first fixed contact which is grounded,
A second fixed contact electrically connected to the power source side connection conductor,
A grounding switch having a movable blade (BLADE) rotatable at a first position in contact with the first stationary contactor and a second position in contact with the second stationary contactor; And
A first outer portion of the small-diameter portion enclosure in which the first fixed contact is installed and a second outer portion in which the movable blade in the second position is located inside the small-diameter portion enclosure, And a semi-conductive covering layer which is covered and grounded to an external portion of the SOH part enclosure selectively including only the first external part and the second external part. The method according to claim 1,
The semi-
Side bushing portion and the power-side bushing portion, except for the first external portion of the small-diameter portion enclosure in which the first fixed contactor is installed, of the external portion of the small- Wherein the solid insulated switchgear is a softer unit of the solid insulated switchgear. The method according to claim 1,
The semi-
Wherein the first external portion of the small-diameter portion enclosure, in which the first fixed contact is installed, of the external portion of the small-diameter portion enclosure is formed so as to cover only the second external portion and the rear base portion of the load- Wherein the solid insulated switchgear is a softer unit of the solid insulated switchgear. The method according to claim 1,
The semi-
Wherein the cover is formed only on a portion of the outer portion of the outer portion of the outer portion of the small-size enclosure having a vertical height such as the first outer portion of the small-size portion enclosure.

Images