KR101119333B1 - Main circuit switch for high voltage load break switchgear - Google Patents

Abstract

The present invention is to provide a main circuit breaker including a movable rod that can increase the creepage insulation distance in the main circuit breaker for high voltage load switch, according to the present invention is embedded in the electrical solid insulation housing and the solid insulation housing A main circuit switch for a high voltage load switch comprising a vacuum interrupter for main circuit switch and a main conductor embedded in the solid insulating material housing and electrically connected to the main circuit switch vacuum interrupter. And a movable rod having a plurality of raised portions on a surface thereof to have a long creeping insulation distance, and a movable rod transferring a driving force for opening and closing the circuit to the main circuit opening and closing vacuum interrupter.

High voltage load switch, main circuit breaker, solid insulator housing, movable rod, packing, insulation member

Description

Main circuit breaker for high voltage load breaker {MAIN CIRCUIT SWITCH FOR HIGH VOLTAGE LOAD BREAK SWITCHGEAR}

The present invention relates to a high voltage load switch, and more particularly, to a main circuit switch for a high voltage load switch having a movable rod that can increase the creepage insulation distance.

In general, power generated at a voltage of approximately 20,000 V (volts) in a power plant is boosted to ultra high voltage of 22, 000 V or more in consideration of power transmission efficiency, and then is transmitted to a primary substation. Primary substations supply power by stepping down the transmitted power, and the power supplied from the primary substation is supplied to the transformer through distribution lines composed of overhead distribution lines and underground distribution lines. The switchboard is supplied to the low pressure consumer.

A load breaker is usually installed to connect the underground distribution line and the ground wiring for the purpose of branching and branching the underground distribution line. In the past, a gas insulated switchgear in which sulfur hexafluoride (SF6) gas was encapsulated as an insulating gas has been mainly used. However, as the use of sulfur hexafluoride gas, which is one of the greenhouse gases, has been worldwide, in recent years, A solid insulated load switch is developed and used for embedding a phase (aka pole) switch in a solid insulating material to promote electrical isolation between phases of circuits.

In such a high voltage solid insulated load switch, a vacuum interrupter having excellent high voltage breaking performance is commonly used as a circuit breaker in a vacuum vessel as a switching part of a main circuit, and a movable part (movable contact, movable contact) of the vacuum interrupter is used. The contactor and the extension of the movable contactor are connected to an actuator that provides external open / close driving force via a movable rod. In addition, such a movable rod is made of a material having at least an external electrical insulation.

However, in the high voltage solid insulation load switch according to the prior art, the movable rod has a flat outer surface, so that the creepage insulation distance (surface insulation distance) required for the high voltage is insufficient, and thus the electrical insulation performance against the high voltage is insufficient. There was a problem.

Accordingly, the present invention solves the problems of the prior art, and an object of the present invention is to provide a main circuit breaker in a high voltage solid insulated load switch with a movable rod that can increase the creepage insulation distance required for high voltage. It is.

An object of the present invention is to provide an electrical solid insulating material housing, a main circuit opening and closing vacuum interrupter embedded in the solid insulating material housing, and a main conductor embedded in the solid insulating material housing and electrically connected to the main circuit opening and closing vacuum interrupter. In the main circuit breaker for high voltage load switch provided therein,

A high voltage load according to the present invention, comprising: a movable rod formed of a solid insulator having electrical insulation and having a plurality of raised portions on a surface thereof, and transmitting a driving force for opening and closing the circuit to the main circuit opening and closing vacuum interrupter. It can be achieved by providing a main circuit breaker for the switchgear.

The main circuit breaker for a high voltage load switch according to the present invention is formed with a wave surface having a plurality of ridges on the surface of the movable rod, the creepage insulation distance is increased to obtain an excellent electrical insulation performance against high voltage have.

Since the main circuit breaker for the high voltage load switch according to the present invention further installs an insulation packing member at the upper end of the movable rod, it is possible to obtain the effect of more electrically insulated the movable rod.

The main circuit breaker for the high-voltage load switch according to the present invention has the O-ring portion of the insulation packing member, so that the O-ring portion closely adheres to the movable rod, it is possible to obtain the effect of waterproofing the rainwater from the top into the movable rod. .

The main circuit breaker for the high voltage load switch according to the present invention further includes an insulating material fixing member for fixing the insulating packing member to the solid insulating material housing, so that the insulating packing member can be fixed to the solid insulating material housing stably and electrically insulated. The effect can be obtained.

In the main circuit breaker for a high voltage load switch according to the present invention, the movable rod is connected to the output shaft of the external actuator and the upper shaft bearing portion of the electrical insulation material inserted into the upper portion of the movable rod, and the movable rod is connected to the movable portion of the vacuum interrupter Since the lower bearing portion of the electrical insulation material inserted into the lower portion of the lower portion of the insulating rod, the connection between the movable rod and the actuator output shaft can be electrically insulated, and the movable portion of the vacuum interrupter and the lower portion of the movable rod can also be electrically insulated. have.

The object of the present invention and the constitution and effects of the present invention to achieve the same will be more clearly understood by the following description of the preferred embodiment of the present invention with reference to the accompanying drawings.

First, a configuration of a main circuit breaker for a high voltage load switch according to an embodiment of the present invention will be described with reference to FIG. 1, which is a longitudinal sectional view showing an internal configuration of a main circuit switch for a high voltage load switch according to an embodiment of the present invention.

As shown, the main circuit breaker 1 for the high voltage load switch according to the embodiment of the present invention is largely divided into a solid insulating housing (housing) (1a), the main circuit opening and closing vacuum interrupter (2), the main conductor (main conductor), a vacuum interrupter 3 for grounding opening and closing, and a movable rod 4. Preferably, the main circuit breaker 1 may further include an insulating packing member 5, an insulating material fixing member 6, and a lower terminal portion 8.

The solid insulator housing 1a is made of, for example, an electrical solid insulator such as epoxy, and has a vacuum interrupter 2 for opening and closing the main circuit, a main conductor 7, and a vacuum interrupter 3 for ground opening and closing. ), The movable rod 4, the insulation packing member 5, the lower terminal portion 8, and the like are embedded with the components constituting the main circuit breaker 1, and the solid insulating housing 1a is formed of a solid insulating material. The components are housed in electrical isolation from the outside.

The main circuit opening and closing vacuum interrupter (2) is an opening and closing means for electrically connecting or disconnecting the upper main conductor (7) and the lower terminal portion (8), and is capable of moving in and out of a vacuum container made of, for example, ceramic. It includes a movable contact (2a) and a fixed contact (2b) fixedly installed extending into and out of the vacuum vessel. When the movable contactor 2a of the main circuit opening and closing vacuum interrupter 2 contacts the stationary contactor 2b in the vacuum vessel, the upper main conductor 7 and the lower terminal portion 8 are electrically connected to each other. Is closed, and the current flows, and when the movable contactor 2a of the main circuit opening and closing vacuum interrupter 2 is separated from the stationary contactor 2b in the vacuum container, The lower terminal portion 8 is electrically cut off so that the main circuit is opened and the current is not cut off.

The main conductor 7 is embedded in the solid insulating housing 1a and electrically connected to the movable contactor 2a of the main circuit opening and closing vacuum interrupter 2 and the stationary contactor 3b of the grounding opening and closing vacuum interrupter 3 described later. As means for providing the main conduction path to be connected, for example, it may be made of a conductive material such as copper. As shown in FIG. 1, the main conductor 7 extends in the horizontal direction from the middle portion in the longitudinal direction of the solid insulator housing 1a, and has one end of the movable contactor of the vacuum interrupter 2 for opening and closing the main circuit. A fixed contact 3b of the vacuum interrupter 3 for ground opening and closing, which is electrically connected to (2a) and the other end is a terminal part which can be connected to an external line, and is connected between the one end and the other end via a connecting conductor. Is electrically connected to the.

The ground interrupting vacuum interrupter 3 is embedded in the solid insulator housing 1a, and includes a movable contactor 3a capable of moving in and out of the vacuum container and a fixed contactor 3b extending and fixed in and out of the vacuum container. The fixed contactor 3b is electrically connected to the main conductor 7 through the connecting conductor, and the movable contactor 3a is grounded. Therefore, when the movable contactor 3a of the ground opening / closing vacuum interrupter 3 contacts the stationary contactor 3b in the vacuum vessel, the main conductor 7 is grounded so that the current of the main circuit flows to ground. When the movable contactor 2a of the opening / closing vacuum interrupter 2 is separated from the fixed contactor 2b in the vacuum vessel, the main circuit through the main conductor 7 is disconnected from ground, so that the current of the main circuit According to the opening / closing operation of the opening / closing vacuum interrupter 2, the state is energized or cut off.

The movable rod 4 is a solid insulator having electrical insulation, and in the preferred embodiment of the present invention, the movable rod 4 may be formed of an epoxy material having excellent electrical insulation and mechanical strength as a thermosetting plastic material. The movable rod 4 has a plurality of ridges 4a on its surface as shown in FIGS. 2 to 4. The purpose of forming such a plurality of ridges 4a on the surface of the movable rod 4 to form the surface of the movable rod 4 into a corrugated surface is that the creepage distance of the movable rod 4 in comparison with a conventional planar configuration. The surface distance) is intended to increase the creepage insulation distance required for the movable rod 4. The movable rod 4 is connected to an output shaft of an external actuator to perform a function of transmitting a driving force for circuit opening and closing to the main circuit opening and closing vacuum interrupter. Here, as an external actuator, for example, a mechanical actuator using a spring force as a driving force, as disclosed in Korean Patent Registration No. 566435 (name of the invention: a three-position load switchgear with a net-slip mechanism) registered by the applicant of the present invention; In contrast, mechanical actuators can be miniaturized, quiet in operation, and long in service life. Permanent Magnet Actuators, which utilize the electromagnetic force of electromagnets, which are being actively researched and developed in recent years, can be used. Can be. Also, as shown in FIG. 4, the movable rod 4 includes an electrical insulating material upper bearing portion 4b and an electrical insulating material lower bearing portion 4c.

The electrical insulating material upper bearing portion 4b may be composed of an injection molded synthetic resin insulating material, is inserted into the upper portion of the movable rod, and has a socket-shaped connection end to drive the output shaft and the drive of the external actuator through this connection end. Can be connected. A connecting groove 4b2 is formed on the outer circumferential surface of the upper end portion of the electrical insulating material upper bearing portion 4b to provide a portion to be in close contact with the corresponding inner surface of the insulating packing member 5 to be described later.

The electrical insulating material lower bearing portion 4c may be composed of an injection molded synthetic resin insulating material, is inserted into the lower portion of the movable rod, and has a socket-type connection end, and through this connection end, a vacuum interrupter for opening and closing the main circuit ( 2), that is, it can be drive-connected with the movable contactor 2a.

Meanwhile, the insulating packing member 5 is connected to the upper end of the movable rod 4 and fixed to the upper end of the solid insulating material housing 1a, as shown in FIGS. Means to electrically insulate.

A more detailed configuration of the insulating packing member 5 will be described with reference to FIG. 5.

The insulating packing member 5 is made of a rubber material and has an O-ring portion 5a that is close to the movable rod (see FIGS. 1 to 4) to be waterproof. In more detail, the O-ring portion 5a is in close contact with the connecting groove portion 4b2 of the movable rod 4 in FIG. 4 to seal the gap between the movable rod 4 and the insulating packing member 5 without any gap, thereby providing excellent quality through the gap. The inflow of the back can be waterproof. The insulating packing member 5 also includes an upper lid portion 5b, a movable rod contact surface portion 5c, an outer circumferential surface portion 5d and a flange portion 5e. In other words, the insulating packing member 5 is a portion connecting the movable rod contact surface portion 5c corresponding to the inner diameter portion, the outer circumferential surface portion 5d corresponding to the outer diameter portion, and the inner diameter portion and the outer diameter portion from above. The upper lid portion 5b, an O-ring portion 5a formed to extend radially from the upper end of the movable rod contact surface portion 5c corresponding to the inner diameter portion to the center side thereof, and the outer peripheral surface portion 5d corresponding to the outer diameter portion. A flange portion 5e provided for fixing to extend radially outward from the flange.

The upper lid portion 5b is a means for covering and sealing the gap between the upper opening portion through which the movable rod 4 enters and exits the movable rod 5 in the solid insulating housing 1a together with the outer peripheral surface portion 5d.

The movable rod contact surface portion 5c corresponds to the inner diameter portion of the insulating packing member 5, and contacts the upper pipe shaped portion into which the insulating material upper bearing portion 4b of the movable rod 5 is fitted. Part.

The outer circumferential surface portion 5d is a portion in close contact with the inner diameter wall surface of the upper opening of the solid insulating housing 1a that the movable rod 4 enters and exits, and also serves to support the upper lid portion 5b.

 The flange portion 5e is provided for fixing to extend radially outwardly from the outer circumferential surface portion 5d as described above, and the insulating packing member 5 is provided with the solid insulating material housing 1a even when the movable rod 4 is pulled in and out. ) To stop the insulating packing member 5 from being pushed into the upper opening through which the movable rod 4 enters and exits.

On the other hand, the insulating material fixing member 6 is a means for fixing the insulating packing member 5 to the upper portion of the solid insulating material housing (1a). As shown in FIG. 3, the insulating material fixing member 6 is formed of an injection molded sheet material having a quadrangular electrical insulation property. In addition, the insulating material fixing member 6 has a central through portion for allowing the movable rod 4 to enter and exit and a screw hole at four corners. The screw holes allow the fastening means such as fastening screws to pass through the insulating material fixing member 6 to the upper surface of the solid insulating material housing 1a.

On the other hand, the lower terminal portion 8 is electrically connected to the other side (for example, the load side or the power side) of the main circuit relative to one side (for example, the power supply side or the load side) of the main circuit connected to the right terminal portion in FIG. 1 of the main conductor 7. This is the part corresponding to the terminal. The lower terminal portion 8 is mechanically and electrically connected to the stationary contactor 2b of the main circuit opening and closing vacuum interrupter 2 through a connecting means such as a conductive material bolt, for example. Therefore, when the movable contactor 2a contacts the fixed contactor 2b in the vacuum container of the main circuit opening and closing vacuum interrupter 2, the lower terminal portion 8 and the main conductor 7 are electrically connected to each other. The circuit is closed and, for example, energization between the main circuit between the power supply side and the load side is possible. When the movable contactor 2a is separated from the stationary contactor 2b in the vacuum container of the main circuit opening and closing vacuum interrupter 2, the lower terminal portion 8 and the main conductor 7 are electrically disconnected from each other to open the main circuit. In this state, energization between the main circuit between the power supply side and the load side is cut off.

Meanwhile, the operation of the main circuit breaker for the high voltage load switch according to the embodiment of the present invention configured as described above will be briefly described.

In Fig. 1, when the movable rod 4 connected to the output shaft of an external mechanical or electromagnetic actuator is driven in a direction to be drawn out of the solid insulating housing 1a by driving the output shaft of the actuator, the movable rod 4 Moves upwards, whereby the movable contactor 2a of the main circuit opening and closing vacuum interrupter 2 connected to the movable rod 4 is separated from the stationary contactor 2b in the vacuum vessel, and thus the lower terminal portion 8 ) And the main conductor 7 are electrically disconnected from each other so that the main circuit is opened and, for example, the main circuit between the power supply side and the load side is interrupted. At this time, the movable rod 4 has an electric insulation creepage distance is increased by having a plurality of raised portions (4a), so that the transfer of the residual current by the arc to the external actuator side through the movable rod (4) even for a high voltage Can be minimized.

In addition, in FIG. 1, when the movable rod 4 connected to the output shaft of an external mechanical or electromagnetic actuator is driven in the direction drawn from the solid insulation housing 1a by the drive of the output shaft of the actuator, the movable rod 4 ) Moves downwards, whereby the movable contactor 2a of the main circuit opening and closing vacuum interrupter 2 connected to the movable rod 4 contacts the stationary contactor 2b in the vacuum vessel, and thus the lower terminal portion ( 8) and the main conductor 7 are electrically connected to each other so that the main circuit is in a closed state, for example, a state where energization between the main circuits between the power supply side and the load side is possible. Even at this time, the movable rod 4 is electrically insulated creepage distance is increased by having a plurality of ridges (4a), so that the current flow to the external actuator side through the movable rod (4) even for high voltage is minimized insulated Can be.

On the other hand, when the movable contactor 3a of the ground opening / closing vacuum interrupter 3 contacts the stationary contactor 3b in the vacuum vessel, the main conductor 7 is grounded so that the current of the main circuit flows to ground. When the movable contactor 2a of the furnace opening and closing vacuum interrupter 2 is separated from the fixed contactor 2b in the vacuum vessel, the main circuit through the main conductor 7 is separated from the ground, and the current of the main circuit is described above. According to the opening / closing operation of the main circuit opening and closing vacuum interrupter 2, the state becomes energized or cut off.

1 is a longitudinal sectional view showing an internal configuration of a main circuit breaker for a high voltage load switch according to an embodiment of the present invention,

2 is a partial longitudinal cross-sectional view showing an exploded view of a movable rod, an insulating packing member, and an insulating material fixing member, which are features of a main circuit breaker for a high voltage load switchgear according to an embodiment of the present invention;

Figure 3 is an exploded perspective view showing the appearance by disassembling the movable rod and the insulating packing member and the insulating material holding member which is a feature in the main circuit breaker for high voltage load switchgear according to an embodiment of the present invention,

4 is a longitudinal sectional view of only a movable rod which is a feature in a main circuit breaker for a high voltage load switchgear according to an embodiment of the present invention;

5 is a longitudinal sectional view showing a detailed configuration of an insulating packing member which is a feature in a main circuit breaker for a high voltage load breaker according to an embodiment of the present invention.

* Explanation of symbols on the main parts of the drawings

1: main circuit breaker 1a: solid insulation housing

2: main circuit opening and closing vacuum interrupter 2a: movable contactor

2b: fixed contact 3: vacuum interrupter for earth opening and closing

3a: movable contactor 3b: fixed contactor

4: movable rod 4a: ridge

4b: insulating material upper bearing part 4b1: bearing groove part

4b2: Connection groove portion 4c: Insulation material lower bearing portion

4c1: bearing groove

5: insulation packing member 5a: O-ring portion

5b: upper lid portion 5c: movable rod contact surface portion

5d: outer peripheral surface portion 5e: flange portion

6: insulation material fixing member

7: Main conductor 8: Lower terminal

Claims (6)

A mains for high voltage load switchgear comprising an electrical solid insulator housing, a main circuit opening and closing vacuum interrupter embedded in the solid insulator housing, and a main conductor embedded in the solid insulating material housing and electrically connected to the main circuit opening and closing vacuum interrupter. In the circuit breaker, And a movable rod formed of a solid insulator having electrical insulation and having a plurality of raised portions on the surface thereof, and configured to transfer a driving force for opening and closing the circuit to the main circuit opening and closing vacuum interrupter. The movable rod, An electrical insulation upper bearing portion connected to an output shaft of an external actuator and inserted into an upper portion of the movable rod; And The main circuit breaker for a high voltage load switchgear comprising a; a lower bearing portion of the electrical insulating material is connected to the movable portion of the vacuum interrupter, and inserted into the lower portion of the movable rod. The method of claim 1, And an insulating packing member connected to an upper end of the movable rod and fixed to an upper end of the solid insulator housing to electrically insulate an upper portion of the movable rod. switch. 3. The method of claim 2, The insulating packing member is made of a rubber material, and the main circuit breaker for a high voltage load switch, characterized in that it comprises an O-ring (O ring) in close contact with the movable rod to be waterproof. 3. The method of claim 2, The main circuit breaker for a high voltage load switch, characterized in that further comprising an insulating material fixing member for fixing the insulating packing member to the upper portion of the solid insulating material housing. delete 3. The method of claim 2, The main circuit breaker for high voltage load switchgear, wherein the upper bearing portion of the electrical insulating material of the movable rod includes a connection groove connected to the inner surface of the insulating packing member.

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