KR20130131166A - Radiation device for gas insulation circuit breaker - Google Patents

Radiation device for gas insulation circuit breaker Download PDF

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Publication number
KR20130131166A
KR20130131166A KR1020120055032A KR20120055032A KR20130131166A KR 20130131166 A KR20130131166 A KR 20130131166A KR 1020120055032 A KR1020120055032 A KR 1020120055032A KR 20120055032 A KR20120055032 A KR 20120055032A KR 20130131166 A KR20130131166 A KR 20130131166A
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KR
South Korea
Prior art keywords
gas
heat dissipation
fixed
movable
main contactor
Prior art date
Application number
KR1020120055032A
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Korean (ko)
Inventor
안희섭
Original Assignee
엘에스산전 주식회사
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Publication date
Application filed by 엘에스산전 주식회사 filed Critical 엘에스산전 주식회사
Priority to KR1020120055032A priority Critical patent/KR20130131166A/en
Publication of KR20130131166A publication Critical patent/KR20130131166A/en

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
    • H01H33/02—Details
    • H01H33/53—Cases; Reservoirs, tanks, piping or valves, for arc-extinguishing fluid; Accessories therefor, e.g. safety arrangements, pressure relief devices
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
    • H01H9/52—Cooling of switch parts

Abstract

The present invention relates to a heat dissipation device of a gas insulated circuit breaker. According to the present invention, by providing a heat dissipation member on the inner circumferential surface of the fixed main contactor and the movable main contactor or the inner circumferential surface of the enclosure, the insulating gas compressed at high temperature and high pressure during arc extinguishing is discharged into the inner space of the enclosure or the interior of the enclosure. It can be rapidly cooled after being discharged into the space to prevent insulation breakdown when voltage is applied after the breaking of the fault current.

Description

Heat dissipation device for gas insulated breaker {RADIATION DEVICE FOR GAS INSULATION CIRCUIT BREAKER}

The present invention relates to a heat dissipation device of a gas insulated breaker for cooling a heat gas in the gas insulated breaker.

In general, a gas insulated circuit breaker is a device for protecting a power system or power equipment by safely extinguishing a breaking current generated in an accident and maintaining insulation performance even with a transient recovery voltage generated between electrodes.

The gas insulated breaker should maintain the energization performance and insulation performance that can operate the rated current and the rated voltage in the normal state, while the breaking performance should be able to block the fault current in the abnormal state.

In the gas insulated circuit breaker, the current is cut off by the high pressure gas compressed in the compression chamber is injected into the arc through the nozzle to extinguish the arc generated when the current is interrupted. That is, as the high-pressure gas injected into the arc between the contacts through the nozzle absorbs heat from the high-temperature arc, the arc between the fixed contact point and the movable contact is electrically disconnected while the electrical conductivity is removed.

1 is a longitudinal sectional view showing an example of a conventional gas insulated circuit breaker.

As shown therein, the conventional gas insulated breaker is provided with a blocking unit 2 for blocking an accident current in the inner space S1 of the enclosure 1 filled with insulating gas. The insulation gas has high insulation characteristics and SF6, which is an inert insulation gas of tasteless, odorless and nontoxic, is used.

The blocking unit 2 consists of the fixed side 3 and the movable side 4.

The fixed side 3 is provided with a fixed side main contactor 31 of a circular tube shape having an internal accommodation space of a predetermined size and opened in one direction, and a fixed side arc contactor on an inner central axis of the fixed side main contactor 31. (32) is inserted and fixed.

The movable side 4 includes a movable main contactor 41 having a predetermined inner space, a contact housing 42 installed in the movable main contactor 41 in a longitudinal direction, and a contact housing. A piston 43 which is installed inside the 42 to form the compression chamber S2 and the expansion chamber S3, and moves in contact with or separated from the fixed-side arc contact 32 while moving together with the contact housing 42. It consists of the side arc contact 44 and the nozzle 45 which is couple | bonded with the front-end | tip of the movable side main contact 41, and blows compressed gas in the compression chamber S2. The rod 5 and the operation unit 6 are coupled to the rear end of the movable main contactor 41.

In the drawings, reference numeral 5a denotes a rod side gas outlet provided in the rod, 31a is a fixed side gas outlet provided in the fixed side main contactor, and 41a is a movable side gas outlet provided in the movable side main contactor.

In the conventional gas insulated breaker as described above, the movable main contactor 41 is connected to the stationary main contactor 31 by the contact housing 42 in a normal energized state, and the movable arc contactor 44 is fixed to the stationary side. Connected to the arc contact 32, respectively, the electrical circuit between the power supply side and the load side maintains the closed state.

On the other hand, when the gas insulated breaker performs a trip operation (circuit breaking operation), a driving force is transmitted to the rod 5 connected to the manipulator 6 to start a high speed trip operation, and the movable main contactor 42 connected to the rod 5 is started. ) And the movable side arc contact 44 move together in the direction of movement of the rod 5. At this time, between the movable-side arc contactor 44 and the fixed-side arc contactor 32 from the moment when the movable-side arc contactor 44 is separated from the fixed-side arc contactor 32 by the movement of the movable-side main contactor 42. An arc is generated by a fault current generated by a high rotational voltage. At the same time, the volume of the compression chamber S2 of the movable main contactor 41 decreases rapidly as the movable main contactor 42 moves, and the gas of the compression chamber S2 is compressed to arc through the nozzle 45. The arc is extinguished as it is injected toward and the current between the power supply side and the load side is interrupted.

Here, the hot heat gas that absorbs heat from the arc while ejecting toward the arc through the nozzle 45 is discharged into the inside of the enclosure 1 through the fixed side gas discharge port 31a provided in the fixed side main contactor 31. On the other hand, the hot heat gas flowing into the inside of the rod 5 from the movable side arc contactor 44 is provided at the rod side gas discharge port 5a and the movable side main contactor 41 provided at the rod 5. It is discharged toward the enclosure 1 through the movable side gas discharge port 41a. After blocking the arc, the inner space S1 of the enclosure 1 is filled with hot gas of high temperature and high pressure which absorbs thermal energy from the arc.

However, the conventional gas insulated circuit breaker as described above does not have a separate heat dissipation device therein, and thus does not quickly dissipate high temperature heat gas filled in the inner space S1 of the enclosure 1, thereby causing an accident. There was a problem that insulation breakdown occurs between ground or phase by the voltage applied again after the interruption of current.

An object of the present invention, the heat radiation of the gas insulated circuit breaker which can prevent the breakdown of the insulation when the voltage is applied after the interruption of the fault current by rapidly cooling the hot gas filled in the enclosure after the arc blocking I'm trying to provide a device.

In order to achieve the object of the present invention, an enclosure filled with an insulating gas in the inner space: a fixed side main contactor fixed to one side of the inner space of the enclosure; A movable main contactor fixed to the other side of the inner space of the enclosure at a predetermined distance from the fixed main contactor; A fixed-side arc contactor whose one end is fixed inside the fixed-side main contactor; A movable-side arc contactor which is provided to be movable in a direction of the fixed-side main contactor inside the movable-side main contactor and which is selectively detached from the fixed-side arc contactor; Compresses the insulating gas coupled to the movable-side arc contact and filled in the inner space of the enclosure to move between the fixed-side main contactor and the movable-side main contactor so that the fixed-side main contactor and the movable-side main contactor are selectively energized. A contact housing to form a compression chamber so as to; And a heat dissipation member provided on at least one of the fixed main contactor and the movable main contactor to be in contact with the insulating gas discharged from the compression chamber.

Here, the heat radiation member may be formed with a plurality of gas through holes.

In addition, the gas through hole may have a non-uniform cross-sectional area.

The heat dissipation member may have a plurality of heat dissipation fins formed on an inner circumferential surface thereof.

The heat dissipation fins may be formed to cross the moving direction of the gas.

In addition, at least one heat dissipation member may be further provided in the inner space of the enclosure.

The heat dissipation device of the gas insulated circuit breaker according to the present invention is provided with a heat dissipation member on the inner circumferential surface of the fixed main contactor and the movable main contactor or on the inner circumferential surface of the enclosure, whereby the insulating gas compressed to high temperature and high pressure during arc extinguishment enters the inner space of the enclosure. It can be rapidly cooled before being discharged or after being discharged into the inner space of the enclosure to prevent insulation breakdown when voltage is applied after the interruption of the fault current.

1 is a longitudinal sectional view showing an example of a conventional gas insulated breaker;
2 is a longitudinal sectional view showing an example of the gas insulated circuit breaker of the present invention;
Figure 3 is a perspective view showing an example of the heat radiation member in Figure 2,
4 is a sectional view taken along the line "II" in Fig. 3,
5 and 6 are longitudinal cross-sectional view showing a normal operation state and a blocking state in the gas insulated breaker according to FIG.
FIG. 7 is a longitudinal cross-sectional view of a heat dissipation member provided in an enclosure in the gas insulated breaker according to FIG. 2; FIG.
8 and 9 are perspective views showing another embodiment of the heat dissipation member in the gas insulated breaker according to FIG.

Hereinafter, a heat dissipation device of a gas insulated circuit breaker according to the present invention will be described in detail based on an embodiment shown in the accompanying drawings.

Figure 2 is a longitudinal sectional view showing an example of the gas insulated circuit breaker of the present invention, Figure 3 is a perspective view showing an example of the heat radiation member in Figure 2, Figure 4 is a "I-I" front sectional view of FIG.

As shown therein, the gas insulated circuit breaker having the heat dissipation device according to the present embodiment is filled with SF6 gas (hereinafter referred to as insulation gas) for extinguishing an arc in the inner space S1 of the sealed enclosure 110. The fixed side main contactor 120, the fixed side arc contactor 130, the movable side main contactor 140, and the movable side arc contactor 150 are installed in the internal space S1 of the 110.

The stationary side main contactor 120 and the movable side main contactor 140 are spaced apart from each other and are disposed to face each other, and are formed in a pipe shape having a space formed therein. Inside the fixed side main contactor 120 is provided with a fixed side arc contact 130, one end of which is fixed so that the other end protrudes out of the fixed side main contactor 120.

The contact housing 160 is installed inside the movable main contactor 140. The contact housing 160 is inserted to slide inwardly of the fixed side main contactor 120 and the movable main contactor 140 and is filled with insulating gas. The piston 161 is installed in the contact housing 160 to pressurize the insulating gas filled in the main contactor 140 of the movable side. The piston 161 is coupled to the rod 5 together with the movable side arc contact 150. The nozzle 170 into which the fixed-side arc contact 130 is inserted is coupled to one end of the contact housing 160.

The nozzle 170 is inserted into and fixed to the end of the contact housing 160, and the fixing piece 171 surrounding the movable side arc contact 150 and the fixed piece 171 connected to the movable side arc contact 150 are in contact with each other. The diameter of the narrow portion 172 and the orifice is formed in the narrow diameter portion 172 to increase the injection speed of the compressed gas is compressed to surround a section of the movable arc contact 150 with the same diameter It consists of the enlarged diameter part 173 which forms a space. The opening end of the enlarged diameter portion 173 is formed to face the fixed side gas discharge port 121 provided on the main surface of the fixed side main contactor 120.

The movable side arc contact 150 is provided with a connection tip 151 provided inside the nozzle 170 and coupled to the rod 5, and an expansion cap 152 wrapped around the outer circumferential surface of the connection tip 151 to press and protect the arc. Is done. The connection tip 151 is made of a conductor to which the fixed side arc contact 130 is inserted and connected, and a tip is pressed against the outer circumferential surface of the fixed side arc contact 130. An end portion of the expansion cap 152 is bent toward the movable side arc contact 150 to form a contact end 153 contacting the fixed side arc contact 130. And the movable side arc contact 150 is coupled to one end of the rod 5 extending from the manipulator 6.

The rod 5 may be formed in a cylindrical shape, and at least one rod side gas outlet 5a may be formed on a main surface thereof so that gas may be guided from the internal space of the rod 5 to the compression chamber S2. The rod-side gas outlet 5a is formed at a position capable of reciprocating both sides with a partition wall fixed inside the movable main contactor 140 therebetween. The movable side main contactor 140 is provided with a movable side gas outlet 141 for guiding the high temperature insulating gas discharged through the rod side gas outlet 5a to the enclosure 110.

In the gas insulation circuit breaker according to the present embodiment as described above, the movable main contactor 140 is connected to the fixed main contactor 120 by the contact housing 160 as shown in FIG. The arc contact 150 is connected to the fixed-side arc contact 130, respectively, so that the electrical circuit between the power supply side and the load side maintains the closed state.

On the other hand, when an abnormal current is generated, the movable main contactor 140 is separated from the fixed main contactor 120 while the rod 5 is moved to the right side of the drawing by the manipulator 6 as shown in FIG. do. At this time, the arc is generated while the fixed side arc contact 130 and the movable side arc contact 150 are separated, but the arc is compressed in the compression chamber S2 by the piston 130 and sprayed through the nozzle 170. It can be quickly extinguished by the high temperature insulating gas.

Here, the high temperature insulating gas generated in the process of blocking the current is the internal space of the enclosure 110 through the gas outlets 121 and 141 of the fixed main contactor 120 and the movable main contactor 140. If it is discharged to S1) and cooled, but this heat gas is not rapidly radiated, insulation breakdown may occur between ground or phase by the voltage applied again after the blocking of the fault current.

Therefore, in the present embodiment, as shown in FIGS. 2 to 6, the heat dissipation members 181 and 185 may be installed at the periphery of the outlet side of the nozzle 170 and the periphery of the rod side gas outlet 5a, respectively. The heat dissipation members 181 and 185 are the gas discharged through the nozzle 170 and the hot gas discharged through the rod side gas discharge port 5a to the fixed side gas discharge port 121 and the movable side gas discharge port 141. It may be installed in a position to cool the hot heat gas before being guided to. The heat dissipation members may be formed of a material having a high heat transfer coefficient such as aluminum.

Here, the heat dissipation member provided between the nozzle and the fixed side main contactor 120 is called the first heat dissipation member 181, and the heat dissipation member provided between the rod 5 and the movable main contactor 140 is second heat dissipated. It is referred to as member 185. Since the first heat dissipation member 181 and the second heat dissipation member 185 may be formed in the same shape, the second heat dissipation member 185 will be described below as a representative example.

The second heat dissipation member 185 is formed in an arc shape and fixed to the inner circumferential surface of the movable main contactor 140, and a plurality of fixing pieces 186 are formed in a cylindrical shape and have a predetermined interval on the inner circumferential surface of each fixing piece 186. It may be made of a heat dissipation tube 187 provided with.

Each connecting portion 188 may be formed between the plurality of fixing pieces 186 and the heat dissipation tube 187 at predetermined intervals along the circumferential direction. Each connection 188 may be formed radially.

The fixing piece 186 may be welded or bolted to the inner circumferential surface of the fixed main contactor 120 or the inner circumferential surface of the movable main contactor. And the length of the fixed piece 186 of both gas outlets 121, 141 so as not to overlap the gas outlets 121, 141 provided in the fixed side main contactor 120 and the movable side main contactor 140. Each of which is disposed therebetween passes through each of the first heat dissipation member 181 and the second heat dissipation member 185 before the high-temperature insulating gas is discharged into the enclosure 110, and then into the gas outlets 121 and 141. It is preferable to be able to discharge.

A plurality of gas through holes 187a may be formed in the heat radiating tube 187. Although the gas through hole 187a may be formed in the same shape, it may be preferable that the gas through hole 187a near the rod side gas discharge port 5a be formed to be large in order to increase the possibility of the gas contacting the heat radiating member. .

On the other hand, although not shown in the drawings, the fixing piece is formed in a cylindrical shape, the heat radiating member may be formed in a double tube shape.

The heat dissipation device of the gas insulated circuit breaker according to the present embodiment as described above has the following effects.

That is, when an abnormal current is generated and the manipulator 6 is operated, the contact housing 160 is separated from the fixed side main contactor 120 while the rod 5 connected to the manipulator 6 moves to the right side of the drawing. . Then, the fixed main contactor 120 and the movable main contactor 140 are separated to block the flow of current. At this time, the movable side arc contactor 150 moves to the left side of the drawing together with the contact housing 160 and is separated from the fixed side arc contactor 130. In this process, the fixed side arc contactor 130 and the movable side arc contactor ( An arc occurs between 150).

However, when the contact housing 160 moves to the left side of the drawing, the compression chamber S2 formed between the partition wall 142 and the piston 161 coupled to the contact housing 160 also moves to the left side. ), The insulation gas is compressed to high temperature and high pressure, and the high temperature insulation gas is injected through the nozzle to extinguish the arc.

The high temperature insulating gas arc-extinguishing the arc passes through the gas through hole (unsigned) provided in the heat dissipating tube (unsigned) of the first heat dissipation member 181 before passing through the fixed side gas outlet 121. Heat is exchanged with the member 181 to radiate heat. At the same time, the insulating gas may be further enhanced by the turbulence while passing through the gas through hole (unsigned) to further improve the heat dissipation effect.

On the other hand, a part of the high-temperature insulating gas compressed in the compression chamber (S2) is introduced into the rod 5 and discharged into the inner space of the movable main contactor 140 through the rod side gas outlet 5a. The insulation gas is heat-exchanged through the second heat dissipation member 185 before being discharged to the movable side gas outlet 141 of the movable main contactor 140, or turbulent and heat-dissipated to the enclosure through the movable side gas outlet 141. It is discharged to the internal space (S1) of (110).

As shown in FIG. 7, a third heat dissipation member 190 may be installed on the inner circumferential surface of the enclosure 110. The third heat dissipation member 190 may be formed or assembled integrally on the inner circumferential surface of the enclosure by consisting of a plurality of heat dissipation fins, but the heat dissipation tube 191 in which the plurality of heat dissipation fins 191a are integrally formed on the inner circumferential surface as shown in FIG. The inner circumferential surface of the can be welded or bolted. Although not shown in the drawings, the third heat dissipation member may be installed at predetermined intervals on the inner circumferential surface of the enclosure. As a result, the gas passing through the gas outlets of the fixed main contactor and the movable main contactor is once again contacted with the third heat dissipation member in the inner space of the enclosure, thereby depriving heat, so that the gas inside the enclosure can be cooled more quickly.

On the other hand, if there is another embodiment of the heat dissipation device of the gas insulated breaker according to the present invention.

That is, in the above-described embodiment, the first heat dissipation member and the second heat dissipation member are formed in a double tube shape, so that a plurality of gas through holes 187a are formed in the heat dissipation tube 187, but this embodiment is as shown in FIG. The first heat dissipation member (not shown) and the second heat dissipation member 285 (hereinafter, the second heat dissipation member will be described as a representative example as described above) will have an inner circumferential surface of the heat dissipation tube 286 formed in a cylindrical shape. A plurality of heat dissipation fins 287 may be formed on the substrate.

The heat dissipation fins 287 may be formed to be in a flow direction of the gas, for example, in the case of the second heat dissipation member 285, so as to cross the length direction of the rod, that is, the flow direction of the gas.

Here, when the heat radiating fins 287 are formed to cross the flow direction of the gas, not only the contact between the gas and the heat radiating fins 287 is improved, but also the gas is promoted by the heat radiating fins 287, so that the heat radiating effect is improved. However, the flow resistance may increase and gas may not be released quickly.

Therefore, although not shown in the drawings, the heat radiation fins may be preferably formed at an acute angle or a spiral shape with respect to the flow direction of the gas to have a predetermined inclination angle rather than staggered to be orthogonal to the flow direction of the gas.

As shown in FIG. 9, the second heat dissipation member 385 may be formed by forming a plurality of heat dissipation fins 387 on the inner circumferential surface of the heat dissipation tube 386 so as to match the flow direction of the gas, that is, the length direction of the rod 5. . In this case, the flow of the gas can be smoothly minimized by minimizing the flow resistance of the gas.

Meanwhile, in the embodiment of FIG. 8 and the embodiment of FIG. 9, a plurality of heat dissipation tubes (not shown) 286 and 386 of the first heat dissipation member (not shown) and the second heat dissipation member 285 and 385 are provided. Gas through holes 286a and 386a may be formed. The gas through holes 286a and 386a may be formed uniformly along the length of each heat dissipation member, but in some cases, the gas through holes 286a and 386a may be formed in different shapes or sizes for each part of the heat dissipation member.

For example, in the case of the second heat dissipation members 285 and 385, the gas through-hole of the portion adjacent to the movable side gas outlet 141 is relatively small while the gas through-hole of the portion far from the movable side gas outlet 141 is formed. It may be desirable to form relatively large. Then, as the flow path resistance becomes larger than the portion adjacent to the gas discharge port, the gas evenly contacts the entire heat dissipation member and is guided to the fixed side gas discharge port, thereby further improving the gas cooling effect.

110: enclosure 120: fixed side main contactor
121 gas outlet 130 fixed-side arc contact
140: main contactor on the movable side 141: gas outlet
150: movable side arc contact 160: contact housing
170: nozzle 181,185: heat dissipation member
186: fixing piece 187: heat dissipation tube
187a: heat dissipation hole 188: connection portion

Claims (8)

Enclosure filled with insulating gas in the inner space:
A fixed side main contactor fixed to one side of an inner space of the enclosure;
A movable main contactor fixed to the other side of the inner space of the enclosure at a predetermined distance from the fixed main contactor;
A fixed-side arc contactor whose one end is fixed inside the fixed-side main contactor;
A movable-side arc contactor which is provided to be movable in a direction of the fixed-side main contactor inside the movable-side main contactor and which is selectively detached from the fixed-side arc contactor;
Compresses the insulating gas coupled to the movable-side arc contact and filled in the inner space of the enclosure to move between the fixed-side main contactor and the movable-side main contactor so that the fixed-side main contactor and the movable-side main contactor are selectively energized. Sliding member to form a compression chamber so as to; And
And a heat dissipation member provided on at least one of the fixed main contact and the movable main contact to be in contact with the insulating gas discharged from the compression chamber. The method of claim 1,
The heat dissipation member is a heat dissipation device of a gas insulated circuit breaker in which a plurality of gas through holes are formed. 3. The method of claim 2,
The gas through hole is a heat dissipation device of the gas insulated circuit breaker is formed in a non-uniform cross-sectional area. The method of claim 1,
The heat dissipation member is a heat dissipation device of a gas insulated circuit breaker in which a plurality of heat dissipation fins are formed on the inner circumferential surface. 5. The method of claim 4,
The heat dissipation fin is a heat dissipation device of the gas insulated circuit breaker is formed to cross the direction of movement of the sliding member. The method of claim 1,
The heat dissipation device of the gas insulated breaker further comprises at least one heat dissipation member in the inner space of the enclosure. 7. The method according to any one of claims 1 to 6,
At least one of the fixed side main contactor or the movable side main contactor is provided with a gas discharge port to allow the insulating gas to pass therethrough,
The heat dissipation member is a heat dissipation device of a gas insulated breaker provided in the vicinity of the gas outlet. 7. The method according to any one of claims 1 to 6,
One end of the sliding member is formed with a nozzle to selectively insert the fixed-side arc contact,
A rod of a cylindrical body is coupled to one end of the movable side arc contactor to be connected to a manipulator for operating the movable side arc contactor, and the rod side gas outlet is formed in the rod to allow the insulating gas to pass therethrough.
KR1020120055032A 2012-05-23 2012-05-23 Radiation device for gas insulation circuit breaker KR20130131166A (en)

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Application Number Priority Date Filing Date Title
KR1020120055032A KR20130131166A (en) 2012-05-23 2012-05-23 Radiation device for gas insulation circuit breaker

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KR20130131166A true KR20130131166A (en) 2013-12-03

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104362034A (en) * 2014-10-31 2015-02-18 平高集团有限公司 Switch tank and arc extinguish chamber and high-voltage switch gear using switch tank
CN112017904A (en) * 2019-05-28 2020-12-01 河南平芝高压开关有限公司 Circuit breaker and quiet side afterbody air current channel structure thereof
CN114300314A (en) * 2022-01-21 2022-04-08 江苏爱斯凯电气有限公司 Universal circuit breaker

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104362034A (en) * 2014-10-31 2015-02-18 平高集团有限公司 Switch tank and arc extinguish chamber and high-voltage switch gear using switch tank
CN112017904A (en) * 2019-05-28 2020-12-01 河南平芝高压开关有限公司 Circuit breaker and quiet side afterbody air current channel structure thereof
CN112017904B (en) * 2019-05-28 2022-08-12 河南平芝高压开关有限公司 Circuit breaker and quiet side afterbody air current channel structure thereof
CN114300314A (en) * 2022-01-21 2022-04-08 江苏爱斯凯电气有限公司 Universal circuit breaker

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