KR101231764B1 - Gas insulated switchgear - Google Patents

Abstract

PURPOSE: A gas insulated switchgear is provided to shield the surrounding driving contact that is to be separated, thereby reducing the intensity of the electrical field occurring on the cap when opening and closing the breaker. CONSTITUTION: A gas insulted switchgear is as follows. A fixed contact unit(310) comprises a fixed arc contact member(311) and a fixed main contact member(312). A movable arc contact member(321) accommodates a fixed arc contact member. A main nozzle(322) surrounds a movable arc contact member. A movable main contact member(323) is combined on the outside of the main nozzle. A pupper cylinder(324) is combined to a common movable arc contact member, main nozzle, and a movable main contact member. A movable side shield(325) surrounds a movable main contact member. A movable contact unit(320) comprises a plate spring member(326) and the plate spring member is contacted to a fixed contact unit.

Description

Gas Insulated Switchgear {GAS INSULATED SWITCHGEAR}

The present invention relates to a gas insulated switchgear, and more particularly, to provide a shield for reducing the electric field strength between the poles when opening and closing the breaker, reducing the occurrence of re-ignition to improve the breaking performance, the fixed side potential and the movable side A gas insulated switchgear having a leaf spring member for holding a potential above a coin.

In general, the gas insulated switchgear (Gas Insulated Switchgear) (100) is the bus (110), disconnector (120), current transformer (130), breaker (140), repair ground switch (150), line disconnector (160), It is composed of a line grounding switch 170 and the bushing 180. The gas insulated switchgear 100 includes a switchgear 120, a circuit breaker 140, a repair ground switch 150, a line disconnector 160, a line ground switch 170, and an opening / closing device such as a bus line 110. The current transformer 130 and the bushing 180 are collectively stored in a metal tank, and the filling part is supported by a solid insulator. Inside the tank, SF6 gas having excellent insulation performance and extinguishing ability is filled and sealed with an insulating medium. . Here, the circuit breaker 140 acts as a current to protect the converter or the main device by operating instantaneously when a current occurs in the circuit, when an abnormality occurs in the circuit.

The conventional gas insulation switchgear 200 includes a fixed contact portion 210 and a movable contact portion 220. The fixed contact portion 210 includes a fixed main contact member 211, a fixed arc contact member 212 and a fixed side shield 213. The fixed contact portion 210 has a cylindrical shape, and a fixed main contact member 211 is coupled to one end thereof. In addition, the fixed contact portion 210 includes a fixed arc contact member 212 therein. The fixed side shield 213 is coupled to one end of the fixed contact portion 210 and surrounds the fixed main contact member 211 to be spaced apart.

The movable contact 220 includes a movable main contact member 221, a movable arc contact member 222, and a main nozzle 223. The movable main contact member 221 faces the fixed main contact member 211. The movable arc contact member 222 receives the fixed arc contact member 212. The main nozzle 223 is coupled inside the movable main contact member 221 and surrounds the movable arc contact member 222 spaced apart.

The contact part 200 has a structure in which the movable main contact member 221 is inserted into the fixed main contact member 211. At this time, the movable main contact member 221 is smaller than the fixed main contact member 211. This difference results in the electric field strength between the poles forming an inequality field. Unequal electric fields are likely to be re-ignited by the voltage between the poles of the break, leading to a break failure.

Korean Patent No. 10-0952686 discloses a partial discharge by mitigating internal electric field concentration of a breaker part of a gas insulated switchgear using an insulating gas such as sulfur hexafluoride gas, nitrogen gas, or pressurized dry air as an insulating medium. The present invention relates to a circuit breaker part of a gas insulated switchgear equipped with an electric field relaxation electrode which can improve the electrical withstand voltage performance of the circuit breaker to bring operational reliability of the gas insulated switchgear. The circuit breaker unit of the gas insulation switchgear having the electric field relaxation electrode according to the disclosed technology, a cylindrical ceramic insulating tube of which the inside is sealed by a vacuum, and the open end of the ceramic insulating tube is sealed and a fixed drawing electrode is formed at the bottom thereof. A lower conductive plate to be formed, an upper conductive plate which seals an open upper end of the ceramic insulating tube and a movable drawing electrode is formed thereon, and a fixed contact which is installed in the ceramic insulating tube and electrically connected to the fixed drawing electrode; And a movable contact coaxially arranged with the fixed contact in the ceramic insulating tube and electrically connected to the movable drawing electrode by a metallic bellows, and a movable conductor connected to the movable drawing electrode on the ceramic insulating tube. Shut off valve is connected to the movable conductor of the vacuum valve and moves the movable contact up and down. And a pair of field relaxation electrodes which are inserted into the fixed lead-out electrode and the movable lead-out electrode of the vacuum valve, respectively, and are electrically connected to each other, and the side surface of which covers the triple point portion where the ceramic insulation tube and the upper and lower conductive plates contact each other. It is made to include.

Korean Patent No. 10-0631007 discloses a double-drive type gas insulated switchgear, and the arc contact is controlled by controlling the opening point between the bidirectional drive and the arc contact on the driving side and the driven side after the main contact opening. By preventing the phenomenon of opening before the main contact, the contact damage is reduced and the arc contact during the injection of SOHO can be improved by the fast arc arcing, so that the breaking performance can be improved. The present invention relates to a dual-driven gas insulated switchgear that can reduce the overall size of the device and reduce the manufacturing cost. The disclosed technique is installed so as to face the first movable main contactor and to be movable in a direction opposite to the moving direction of the first movable main contactor to be separated from the position contacting the first movable main contactor and the first movable main contactor. A first movable arc contactor disposed opposite to the second movable main contactor displaceable to a position and connected to the second movable main contactor in a direction opposite to the moving direction of the first movable arc contactor, the first movable arc contactor Is connected to transfer power between the second movable arc contactor and the second movable main contactor and the nozzle which are movable to a position in contact with the first movable arc contactor and to a position separate from the first movable arc contactor, during the trip operation, the first movable main contactor and the second movable contactor. After a predetermined time delay after separation between the movable main contacts, the SOHO gas compressed in the compression chamber is injected toward the second movable arc contactor. A delay drive link mechanism for driving the second movable arc contactor separately from the first movable arc contactor, wherein the delayed drive link mechanism is rotatable in a clockwise or counterclockwise direction and the power from the nozzle is opposite to the moving direction of the nozzle. A rotation lever for converting the rotation lever, an end portion rotatably axially connected to an upper portion of the rotation lever, a first position for contact and pressurizing the rotation lever in a clockwise direction, and the rotation lever in a counterclockwise direction A retarder driving lever having a second end having a second position for rotationally contact-pressing, and a rotational position for disengaging from the rotation lever from the first position to the second position or from the second position to the first position and rotating; An additional end is connected to the other end side of the delay driving lever and the other end is connected to the nozzle side to support the power from the nozzle side. A first link for transmitting to a drive lever, one end of which is connected to a lower portion of the pivoting lever, and the other end of which is connected to the second movable arc contactor, wherein the pivoting lever is provided in a direction opposite to the moving direction of the nozzle. And a delay drive link mechanism comprising a second link for transmitting power to a second movable arc contactor.

Korea Patent Registration No. 10-0952686 Korea Patent Registration No. 10-0631007

One embodiment of the present invention is to provide a gas insulated switchgear having a shield that surrounds the movable main contact member spaced apart to reduce the electric field strength between the poles when opening and closing the breaker, reducing the occurrence of re-ignition to improve the breaking performance do.

An embodiment of the present invention is to provide a gas insulated switchgear that is provided with a leaf spring member in the movable contact to maintain the movable contact and the fixed contact on the coin.

In embodiments, a gas insulated switchgear includes a fixed contact portion including a fixed arc contact member and a fixed main contact member spaced apart from the fixed arc contact member, and a movable arc contact member for receiving the fixed arc contact member, and the movable arc contact. A main nozzle surrounding the member spaced apart, a movable main contact member coupled to an outer side of the main nozzle, a movable arc contact member, a paper cylinder coupled to a common end of the main nozzle and the movable main contact member, the paper cylinder, and the A movable contact including a movable side shield which protrudes and bends at a mating surface of the movable main contact member and spaces around the movable main contact member, and a leaf spring member coupled to and bent at the other end of the main nozzle to contact the fixed contact; It includes.

In one embodiment, the fixed contact portion may further include a fixed side shield surrounding the fixed main contact member spaced apart.

In one embodiment, the main nozzle may be made of an insulating material that guides the movement of the movable contact and blocks the arc that may occur upon contact between the stationary and movable contacts.

Gas insulated switchgear according to an embodiment of the present invention has a shield that surrounds the movable main contact member spaced apart to reduce the electric field strength applied to the pole when opening and closing the breaker, it is possible to improve the breaking performance by reducing the occurrence of re-ignition. .

Gas insulated switchgear according to an embodiment of the present invention is provided with a leaf spring member in the movable contact to maintain the movable contact and the fixed contact on the coin.

1 is a view illustrating a general gas insulated switchgear.
2 is a cross-sectional view illustrating a conventional gas insulated switchgear.
3 is a cross-sectional view illustrating a gas insulated switchgear according to an embodiment of the present invention.

Description of the present invention is only an embodiment for structural or functional description, the scope of the present invention should not be construed as limited by the embodiments described in the text. That is, the embodiments are to be construed as being variously embodied and having various forms, so that the scope of the present invention should be understood to include equivalents capable of realizing technical ideas. Also, the purpose or effect of the present invention should not be construed as limiting the scope of the present invention, since it does not mean that a specific embodiment should include all or only such effect.

Meanwhile, the meaning of the terms described in the present application should be understood as follows.

The terms "first "," second ", and the like are intended to distinguish one element from another, and the scope of the right should not be limited by these terms. For example, the first component may be referred to as a second component, and similarly, the second component may also be referred to as a first component.

It is to be understood that when an element is referred to as being "connected" to another element, it may be directly connected to the other element, but there may be other elements in between. On the other hand, when an element is referred to as being "directly connected" to another element, it should be understood that there are no other elements in between. On the other hand, other expressions describing the relationship between the components, such as "between" and "immediately between" or "neighboring to" and "directly neighboring to", should be interpreted as well.

It should be understood that the singular " include "or" have "are to be construed as including a stated feature, number, step, operation, component, It is to be understood that the combination is intended to specify that it does not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or combinations thereof.

All terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs, unless otherwise defined. Generally, the terms defined in the dictionary used are to be interpreted to coincide with the meanings in the context of the related art, and should not be interpreted as having ideal or excessively formal meanings unless clearly defined in the present application.

3 is a cross-sectional view illustrating a gas insulated switchgear according to an embodiment of the present invention.

Referring to FIG. 3, the gas insulated switch 300 includes a fixed contact 310 and a movable contact 320.

The fixed contact 310 includes a fixed arc contact member 311 and a fixed main contact member 312. In one embodiment, the fixed main contact member 312 is disposed spaced apart from the fixed arc contact member 311. In addition, the fixed contact portion 310 further includes a fixed side shield 313. The fixed side shield 313 may be configured to surround the fixed main contact member 312 to be spaced apart.

The movable contact 320 includes a movable arc contact member 321, a main nozzle 322, a movable main contact member 323, a popper cylinder 324, a movable side shield 325, and a leaf spring member 326. . In one embodiment, movable contact 320 may be moved by movable shaft 327 and a drive motor (not shown).

The movable arc contact member 321 may receive the fixed arc contact member 311. In one embodiment, the movable arc contact member 321 is in contact with the fixed arc contact member 311 when the breaker is opened and closed and an arc is generated. The movable arc contact member 321 may be made of an arc resistant material because wear may occur due to the generated arc. For example, it may be composed of a material containing tungsten.

The main nozzle 322 may be configured to surround the movable arc contact member 321 spaced apart. In one embodiment, the spacing between the main nozzle 322 and the movable arc contact member 321 may provide a path through which the insulating gas (eg, SF6) travels. In addition, the main nozzle 322 is composed of an insulator, and can prevent the arc generated in the movable arc contact member 321 and the fixed arc contact member 311 from being diffused.

The movable main contact member 323 is coupled to the outside of the main nozzle 322. In one embodiment, the outer surface of the movable main contact member 323 may be in contact with the inner surface of the fixed main contact member 312. In addition, the movable main contact member 323 and the fixed main contact member 312 are brought into contact with each other in a normal state of the main circuit to connect the main circuit, and fall apart when an abnormal state (for example, overcurrent, etc.) occurs in the main circuit. Can be blocked.

The popper cylinder 324 is coupled to a common end of the movable arc contact member 321, the main nozzle 322, and the movable main contact member 323. In one embodiment, the popper cylinder 324 may inject insulating gas at a distance between the movable arc contact member 321 and the main nozzle 322 when the fixed contact 310 moves.

The movable side shield 325 protrudes and bends at a coupling surface of the popper cylinder 324 and the movable main contact member 323, and is configured to surround the movable main contact member 323 spaced apart from each other. In one embodiment, the movable side shield 325 may be configured to prevent the occurrence of re-ignition by the voltage applied to the movable main contact member 323 and the fixed main contact member 312.

The leaf spring member 326 is coupled to one end in the direction of the movable contact portion 320 of the main nozzle 322 and is bent to contact the fixed contact portion 310. In one embodiment, the leaf spring member 326 may be configured to be in contact with the fixed contact 310 to bring the electric field strength of the fixed contact 310 closer to the equal field. The closeness of the electric field strength to the equality can effectively withstand the voltage across the pole to suppress the occurrence of re-ignition and to increase the reliability of the circuit breaker.

Although described above with reference to the preferred embodiment of the present application, those skilled in the art various modifications and changes to the present application without departing from the spirit and scope of the invention described in the claims below I can understand that you can.

100: general gas insulated switchgear 110: bus
120: disconnector 130: current transformer
140: breaker 150: maintenance earth breaker
160: line breaker 170: line welding switch
180: bushing 200: conventional gas insulated switchgear
210: fixed contact portion 211: fixed main contact member
212: fixed arc contact member 213: fixed side shield
220: movable contact portion 221: movable main contact member
222: movable arc contact member 223: main nozzle
300: gas insulated switchgear 310: fixed contact
311: fixed arc contact member 312: fixed main contact member
313: fixed side shield 320: movable contact
321: movable arc contact member 322: main nozzle
323: movable main contact member 324: popper cylinder
325: movable side shield 326: leaf spring member
327: movable shaft

Claims (4)

A fixed contact comprising a fixed arc contact member and a fixed main contact member spaced apart from the fixed arc contact member; And
A movable arc contact member accommodating the fixed arc contact member, a main nozzle surrounding the movable arc contact member spaced apart, a movable main contact member coupled to an outer side of the main nozzle, the movable arc contact member, the main nozzle and the movable A pair of popper cylinders coupled to a common end of the main contact member, a movable side shield which protrudes and bends at a coupling surface of the popper cylinder and the movable main contact member and encloses the movable main contact member to be spaced apart and the other end of the main nozzle And a movable contact including a leaf spring member that is bent and bent to contact the fixed contact.
The connector according to claim 1, wherein the fixed contact
And a fixed side shield surrounding the fixed main contact member spaced apart.
The method of claim 1, wherein the main nozzle
And an insulating material for guiding the movement of the movable contact and for blocking an arc that may be generated upon contact between the fixed and movable contacts.
The method of claim 1, wherein the main nozzle
And a passage through which the insulating gas flows to the movable arc contact member through a spaced distance from the movable arc contact member.

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