KR101633768B1 - Solid Insulated Switches for Distribution Automation System - Google Patents

Abstract

More particularly, the present invention relates to a solid insulated load switch for distribution automation, and more particularly, to a solid insulated load switch employing a vacuum interrupter in a main circuit portion and a ground insulation portion in a ground circuit portion, To a solid insulated load switch for distribution automation equipped with a connector.
In accordance with an embodiment of the present invention, there is provided a distribution automation load switch including a main body, a plurality of breakers installed in the main body, and a control box provided on the main body, An upper connecting bus line having a plurality of branch lines connected to respective main circuits of the plurality of branch lines, and a PT connecting portion formed between the branch lines; A PT for power supply installed on the upper bus bar to supply power to the control box; And a PT connector having connection grooves formed at both ends thereof, one end of which is coupled to the power source PT, and the other end of which is coupled to the PT connection part.

Description

{Solid Insulated Switches for Distribution Automation System}

More particularly, the present invention relates to a solid insulated load switch for distribution automation, and more particularly, to a solid insulated load switch employing a vacuum interrupter in a main circuit portion and a ground insulation portion in a ground circuit portion, To a solid insulated load switch for distribution automation equipped with a connector.

Generally, electricity generated by the power plant at a voltage of about 20,000V is boosted to ultra high voltage suitable for transmission and transmitted to the primary substation. In the primary substation, the supplied power is reduced to 22.9 kV and supplied to the secondary substation or each customer. The power supplied from the primary substation is supplied to the reception facilities of each customer through the distribution system consisting of the processing distribution line and the underground distribution line, and is supplied to the low-pressure customer through the special-purpose customer, the high-pressure customer and various outdoor installation transformers. At this time, a load break switch (LBS) is used for line division, branching and protection of the transformer primary side of a high-voltage reception switchboard (receiving facility).

In other words, the load switch distributes the power to the devices used in urban and residential complexes, and when the surge occurs in the power system, it breaks the fault section by opening and closing quickly for safety after operation of the circuit breaker, It is a device used to shorten the power outage time by supplying power to the section.

In the past, gas insulated load switches have been widely used in which gas such as SF6 is used to insulate and extinguish. However, in recent years, solid insulated load switches using epoxy molds have been widely used due to prevention of global warming.

Figure 1 shows a solid insulated load switch according to the prior art.

In the prior art, the main body 1 includes the switchgear 2, the operating mechanism portion 3, and the control box 4. In the example of Fig. 1, a 4-circuit-4 switch (breaker) product is shown. In the case of a three-phase circuit, twelve switches (2) are installed. In the switch 2, a vacuum interrupter VI is used for the main circuit portion, and a ground insulating circuit portion can be used for the ground circuit portion. The control box 4 includes a controller 4a and a feeder remote terminal unit (FRTU) 4b. A power supply PT (Power Transformer) 5 for supplying power to the control box 4 is provided under the main body 1. Below the switchgear 2, an upper busbar 6 is provided to supply power to each switchgear 2. In the case of a three-phase circuit, three phase connecting bus bars 6 are provided.

Fig. 2 is a partially exploded perspective view of the PT 5 for power supply and the upper bus bar 6. The PT 5 for power supply is connected to the upper connecting bus line 6 and serves to supply the control voltage to the control box 4 by reducing the high voltage of the main circuit. At this time, a PT connector (connector) 7 is provided to connect the upper bus bar 6 and the power PT 5. One end of the PT connector 7 is connected to one of the branch lines 6a of the upper connecting bus bar 6 and the other end is connected to the connecting port 5a of the power PT 5.

Fig. 3 is a partial perspective view of the power supply PT 5 and the upper connecting bus line 6 in Fig. 1, in which the outer insulating member of the upper connecting bus line is removed. The connecting conductor 7a of the PT connector 7 is connected between the branch terminal 6c branched from the upper connecting conductor 6b of the upper connecting bus line 6 and the connecting terminal 5b of the power supplying PT 5.

However, since the PT connector 7 is connected to the branch line 6a of the upper connecting bus line 6, the PT connector 7 is installed closely to the various conductors to cause an insulation breakdown phenomenon. Also, a partial discharge phenomenon may occur due to foreign matter, bubbles, etc. at the connection portion between the PT connector 7 and the upper connecting bus bar 6. In addition, since the power PT 5 is installed in the lower part of the main body, the size of the entire product is increased.

As a prior art relating to the present invention, Korean Patent No. 10-1100710, " Circuit breaker for underground distribution line ", can be referred to.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems, and it is an object of the present invention to provide a load switch for distribution automation which minimizes deterioration of insulation performance at a connection portion of a power supply PT and a connection bus line, .

In accordance with an embodiment of the present invention, there is provided a distribution automation load switch including a main body, a plurality of breakers installed in the main body, and a control box provided on the main body, An upper connecting bus line having a plurality of branch lines connected to respective main circuits of the plurality of branch lines, and a PT connecting portion formed between the branch lines; A PT for power supply installed on the upper bus bar to supply power to the control box; And a PT connector having connection grooves formed at both ends thereof, one end of which is coupled to the power source PT, and the other end of which is coupled to the PT connection part.

The PT connector includes: a PT connector conductor; A connection pin having one end connected to the PT connector conductor; And a semiconductive member surrounding the connection pin and coupled to the PT connector conductor.

Further, the PT connecting portion is formed at a central portion between the branch line and the branch line.

Further, the PT connecting portion is formed to protrude upward from the upper connecting bus line.

Further, the connection groove is formed in a shape engaging with a connection bushing of the PT connection portion.

In addition, the PT connecting part is provided with a contact terminal, one end of which is connected to the upper connecting bus line.

In addition, the semiconductive member is a semiconductive rubber.

Further, the outer surface of the semiconductive member is smoothly formed.

The PT connector further includes a connection conductor connected to the PT connector conductor.

According to the load automation switchgear according to the embodiment of the present invention, the PT connector is connected to the PT connecting portion provided between the branch lines of the upper connecting bus line, thereby improving the insulation performance. Further, the provision of the semiconductive member in the PT connector has the effect of reducing the partial discharge phenomenon. In addition, since the power supply PT is vertically installed in front of the main circuit, the size of the product is reduced and the occupied area is reduced.

1 is a perspective view of a load switch for distribution automation according to the prior art.
Fig. 2 is a partially exploded perspective view of the power supply PT and the upper connecting bus line in Fig. 1;
Fig. 3 is a partial perspective view of the power supply PT and the upper connecting bus line in Fig. 1, in which the outer insulating member of the upper connecting bus line is removed.
4 is a perspective view of a load switch for distribution automation according to an embodiment of the present invention.
FIG. 5 is an exploded perspective view of the upper connecting bus line and the power supply PT in FIG.
6 is a front view of a top connecting bus line applied to a load switch for distribution automation according to an embodiment of the present invention.
7 is an XY plan view of a PT connector applied to a load switch for distribution automation according to an embodiment of the present invention.
8 is an exploded perspective view of Fig.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings, which are intended to illustrate the present invention in a manner that allows a person skilled in the art to easily carry out the invention. And does not mean that the technical idea and scope of the invention are limited.

FIG. 4 is a perspective view of a load switch for distribution automation according to an embodiment of the present invention, and FIG. 5 is an exploded perspective view of an upper connecting bus line and a power supply PT in FIG. FIG. 6 is a front view of an upper connecting bus line applied to a load switch for distribution automation according to an embodiment of the present invention, and FIG. 7 is an XY plane view of a PT connector applied to a load switch for distribution automation according to an embodiment of the present invention. And Fig. 8 is an exploded perspective view of Fig. Hereinafter, the present invention will be described in detail with reference to the drawings.

A load switch for distribution automation according to an embodiment of the present invention includes a main body 10, a plurality of breakers 11, 12, 13 and 14 installed in the main body 10, A load switch for distribution automation including a control box (15), characterized in that a plurality of branch lines (21) are connected to main circuits (11a, 12a, 13a, 14a) of the plurality of circuit breakers An upper connecting bus line 20 in which a PT connecting portion 22 is formed between the branch lines 21; A power PT 30 installed at an upper portion of the upper bus bar 20 to supply power to the control box 15; And a PT connector 40 having one end connected to the power source PT 30 and the other end connected to the PT connection part 22.

The main body 10 is formed to accommodate a plurality of circuit breakers 11, 12, 13, and 14 and various components. The front surface of the main body 10 can be opened.

A plurality of breakers (11, 12, 13, 14) are installed in the main body (10). The number of circuit breakers is usually determined according to the number of circuits required, and is usually three to four. In Fig. 4, a product made up of four breakers is shown. In the case of a three-phase circuit, three circuit breakers 11, 12, 13 and 14 are provided for each of R, S and T phases. Main circuits (11a, 12a, 13a, 14a) are formed below the circuit breakers (11, 12, 13, 14). Here, it is to be understood that the main circuits 11a, 12a, 13a, and 14a use one sign for each breaker, but all main circuits for R, S, and T are provided.

A control box 15 is provided above the main body 10. A controller for remotely opening and closing the circuit breakers 11 and 12 and a terminal unit (FRTU) .

The upper connecting bus line 20 is provided so as to connect all of the main circuits 11a, 12a, 13a and 14a of the plurality of circuit breakers 11, 12, 13 and 14 for each phase. Therefore, generally, three phase connecting bus bars 20 may be provided.

A plurality of branch lines 21 are protruded from the upper connecting bus line 20 so as to be connected to the main circuit lines 11a, 12a, 13a and 14a. The ends of the branch lines 21 are coupled to the connection interfaces of the main circuits 11a, 12a, 13a and 14a.

The PT connecting portion 22 is protruded between the branch lines 21 of the upper connecting bus bar 20. The PT connecting portion 22 includes a contact terminal 22a and a contact portion bushing 22b connected to the upper connecting conductor 23 of the upper connecting bus line 20 to energize the current.

Here, the PT connecting portion 22 may be formed at the center between the branching line 21a and the branching line 21b. The PT connection portion 22 is formed at the greatest distance from the branch line 21a and the branch line 21b, thereby preventing the electric field concentration. That is, there is an effect that the electric field concentration phenomenon is alleviated more than when the PT connector 40 to be described later is directly connected to the branch line 21. Therefore, there is an effect that the insulation performance is excellent.

Further, the PT connecting portion 22 is formed to protrude above the upper connecting bus bar 20. The PT connector 40 is configured to have a longitudinal length longer than a width of the PT connector 40, so that the power PT 30 can be vertically installed. In addition, it is possible to provide the power PT 30 on the upper portion of the upper bus bar 20. The power supply PT 30 is vertically installed on the upper connecting bus line 20, thereby reducing the size of the main body 10 and reducing the occupied area.

One end of the contact terminal 22a is connected to the upper connecting bus line 20 and the other end is connected to the PT connector 40. [ As an example of the contact terminal 22a, a multi-contactor may be applied.

The PT connector 40 includes a semiconductive member 45 that surrounds the PT connector conductor 42, the connection pin 43 and the connection pin 43 to improve the insulation performance. The connector bushing 41 surrounds the PT connector conductor 42, .

The connector bushing 41 is formed with connection grooves 41a at both ends thereof. The connecting groove 41a is formed in a shape corresponding to the connecting portion bushing 22b of the upper connecting bus bar 20. The connection grooves 41a at both ends can be formed in the same shape. According to an embodiment, the connector bushing 41 may be formed of silicon.

The PT connector conductor 42 is formed with an insertion groove 42a to which the connection pin 43 can be fixed at one end and a mounting groove 42b to which the semiconductive member 45 can be inserted at the outer circumference .

One end of the connection pin 43 is provided in the insertion groove 42a of the PT connector conductor 42 and the other end is exposed in the connection groove 41a of the connector bushing 41. [

The semiconductive member 45 is fitted in the mounting groove 42b of the PT connector conductor 42 and covers the connection pin 43. [ The semiconductive member 45 is formed of a semiconductive material and may be formed of semiconductive rubber, for example. As the semiconductive member 45 is provided at the end of the PT connector conductor 42, airtightness is maintained when the PT connector 40 is coupled to the PT connector 22, thereby preventing bubbles and the like. In addition, it forms an equal potential with the PT connector conductor 42. Therefore, it has an effect of preventing a partial discharge phenomenon caused by a potential difference. In addition, since the outer surface of the semiconductive member 45 is formed smoothly, the insulating performance can be improved.

The PT connector conductor 42, the semiconductive member 45, and the connecting pin 43 may be provided at both ends of the PT connector 40, respectively.

The intermediate connector of the PT connector 40 may be provided with a connecting conductor 44. The length and direction of the connecting conductor 44 and the PT connector conductor 42 are appropriately designed so that the connecting portion between the power source PT 30 and the upper connecting bus line 20 can be made neat and compact.

Although the present invention has been described in connection with the above-mentioned preferred embodiments, it will be apparent to those skilled in the art that various modifications and variations can be made without departing from the spirit and scope of the invention, It is obvious that the claims fall within the scope of the claims.

10 Body 11, 12, 13, 14 Circuit breaker
11a, 12a, 13a, 14a control the main circuit 15
20 phase connecting buses 21, 21a, 21b branch lines
22 PT connection part 22a contact terminal
22b connection bushing 23 phase connection conductor
30 PT 40 PT connector for power supply
41 Connector bushing 41a Connection groove
42 PT connector conductor 42a insertion groove
42b mounting groove 43 connecting pin
44 Connecting conductor 45 Semi conductive member

Claims (9)

A load switch for distribution automation comprising a main body, a plurality of circuit breakers installed in the main body, and a control box provided on the main body,
An upper connection bus line having a plurality of branch lines connected to respective main circuits of the plurality of circuit breakers and having PT connection portions formed between the branch lines;
A PT for power supply installed on the upper bus bar to supply power to the control box; And
And a PT connector having connection grooves formed at both ends thereof and having one end coupled to the power source PT and the other end coupled to the PT connection,
The PT connector includes:
PT connector conductors;
A connection pin having one end connected to the PT connector conductor; And
And a semiconductive member surrounding the connection pin and coupled to the PT connector conductor,
And the outer surface of the semiconductive member is smoothly formed.
delete The load break switch for distribution automation according to claim 1, wherein the PT connecting portion is formed at a central portion between the branch line and the branch line.
The load break switch for distribution automation according to claim 1, wherein the PT connection part is protruded upward from the upper connecting bus line.
The load switch for distribution automation according to claim 1, wherein the connection groove is formed in a shape engaging with a connection bushing of the PT connection part.
The load break switch for distribution automation according to claim 1, wherein the PT connection part is provided with a contact terminal whose one end is connected to the upper connecting bus line.
The load switch for distribution automation according to claim 1, wherein the semiconductive member is a semiconductive rubber.
delete The load switch for distribution automation according to claim 1, wherein the PT connector further comprises a connection conductor connected to the PT connector conductor.

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