JPH10224924A - Breaker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a breaker whose vacuum interruptors can be replaced easily. SOLUTION: A pair of vacuum interruptors 30 are laid in parallel with each other and housed in an approximately cylindrical bottomed case 29 made of insulating material, and fixed lead rods 30a are connected to terminals 31 piercing through the bottom of the case 29 airtightly. On the other hand, a connection conductor 35 which has flexibility and through which respective movable lead rods 30b pierce so as to slide freely is fixed to the case 29 with a bolt 38. The pair of the vacuum interruptors 30 are consistently energized toward the bottom of the case 29.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a circuit breaker, which is capable of easily replacing a vacuum interrupter.

[0002]

2. Description of the Related Art FIG. 4 shows the structure of a conventional gas-insulated switchgear using a circuit breaker. As shown in the figure, a tank 4 and a tank 1 which are formed airtight and filled with an insulating gas are provided. The tank 4 is configured by connecting the unit 4a and the unit 4b at a position indicated by a chain line. Tank 4
A circuit breaker 5 having a built-in vacuum interrupter is accommodated therein, and a cable head 7 is connected to the circuit breaker 5 via a disconnector 6, while a bus 3 in the tank 1 is connected to the circuit breaker 5 via a disconnector 2. It is connected to the. The cable head 7 is connected to a substation 9 for sending out electric power via a cable 8,
A switch 8 and a disconnector 11 are connected to the cable 8.

In such a gas insulated switchgear, in order to replace a vacuum interrupter (not shown) constituting the circuit breaker 5, the switch 10 of the substation 9 is opened, the insulating gas in the tank 4 is extracted, and then the tank is removed. The circuit breaker 5 is removed from the inside of the tank 4, the vacuum interrupter in the circuit breaker 5 is replaced with a new one, and the circuit breaker 5 is installed in the tank 4 in the reverse procedure.

[0004]

However, since the circuit breaker 5 must be taken out after the tank 4 is disassembled by removing the insulating gas in the large tank 4, the work for replacing the vacuum interrupter is troublesome. Further, when the vacuum interrupter is replaced, the insulating gas in the tank 4 is completely removed, so that it cannot be used as electric equipment.

[0005] Therefore, an object of the present invention is to provide a circuit breaker that solves the above problem.

[0006]

According to a first aspect of the present invention, there is provided a circuit breaker comprising a pair of vacuum interrupters inside a substantially bottomed cylindrical case formed of an insulating material. , The fixed lead rods are arranged side by side so as to be on the bottom side of the case, and the terminals are penetrated airtightly through the bottom of the case and provided individually with the respective fixed lead rods inside the case. And a pair of vacuum interrupters are constantly urged toward the bottom surface of the case by connecting the connection conductors having insertion holes through which the movable lead rods of the paired vacuum interrupters are slidably inserted. It is detachably connected to the inner surface of the case, and the opening of the tank filled with the insulating gas is closed by the case, and the case is located inside the tank and the inside of the case is Characterized by being adapted to be attached to the tank in a state of opening to link the outside.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail based on an embodiment shown in the drawings.

FIG. 1 shows the configuration of a gas-insulated switchgear provided with a circuit breaker according to the present invention. As shown, the equipment tank 1
A connection tank 14 is connected to the center of the upper part of 3, and a bus bar tank 15 is connected to the right side of the connection tank 14 via a three-phase insulating spacer 17. Reference numeral 16 denotes a lid for closing the left opening of the connection tank 14. The bus tank 15 may be connected to the left side of the connection tank 14. These three tanks are connected to each other via gas seal packing and bolts.

A circuit breaker 18 and a cable head 19 for connecting a cable are provided in the equipment tank 13. The cable head 19 is connected to the circuit breaker via a main circuit conductor 20, a grounding switch 21, and a disconnecting switch 22. 18. 23 is a support insulator. On the other hand, a bus 24 is accommodated in the bus tank 15, and the bus 24 is connected to the circuit breaker 18 via a disconnector 25 and main circuit conductors 26 and 27.
Operating means 28 is provided outside the equipment tank 13, and the operating means 28 is linked to the circuit breaker 18.

Next, the structure of the circuit breaker 18 will be described in detail. As shown in FIG. 3, a case 29 for housing a pair of vacuum interrupters 30 is provided. The case 29 is formed in an approximately cylindrical shape with a bottom by using an insulating material, and includes a partition portion 29a for vertically partitioning the inside of the case 29;
And a flange 29b for attaching the case 29 to the equipment tank 13. A pair of vacuum interrupters 30 are accommodated above and below the partition portion 29a in the case 29 with the fixed lead bar 30a facing the bottom.

A pair of terminals 31 is provided at the bottom of the case 29 in an airtight manner through the bottom. A fitting hole 32 is formed at the inner end of the terminal 31. The fixed lead bar 30a is fitted through the connection 33. The upper terminal 31 is coupled to the main circuit conductor 27 via a bolt 34, while the lower terminal 31 is coupled to the main circuit conductor 20 via a bolt 34.

The movable lead rod 30 of the vacuum interrupter 30
A connection conductor 35 is provided for connecting b.
As the connection conductor 35, a conductor that is flexible and formed in a substantially rectangular shape is used to constantly urge the vacuum interrupter 30 toward the bottom of the case 29.
A pair of insertion holes are formed near both ends of the connection conductor 35, and the movable lead rod 30 b is slidably inserted into each of the insertion holes via a current collecting contact 36. A mounting bracket 37 is embedded at the right end of the partition 29 a in the case 29, and a central portion of the connection conductor 35 is detachably connected to the mounting bracket 37 via a bolt 38. Thereby, each vacuum interrupter 30 is constantly urged by the spring force of the connection conductor 35, and the vacuum interrupter 3
0 is constrained not to move.

As shown in FIG. 2, an opening 13a is formed in the equipment tank 13, and a packing 40 is formed in the opening 13a.
The mounting plate 41 is mounted via the. Mounting plate 41
Is formed with a flange portion 29b of the case 29 via a packing 42 on the left side of the communication hole 41a, and a partition plate 43 is mounted on the right side thereof via a packing 43a. The operating means 28 is attached to the mounting plate 41, and a pair of insulating rods 44, which are screwed at one end into the end surfaces of the movable lead rods 30b of the vacuum interrupter 30 and reciprocate in the left-right direction, have a packing 44c.
Through the partition plate 43 in an airtight manner.

The structure of the connecting portion between the pair of insulating rods 44 and the operating means 28 will be described with reference to FIG. Insulating rod 4
4, a small-diameter portion 44a having a small outer diameter and a long hole 44b.
On the other hand, the drive rod 45 of the operating means 28 is disposed at a right angle to the insulating rod 44, and one end of each of a pair of L-shaped levers 46 rotatable about a fixed shaft 49 is rotated via a pin. A pin 50 movably connected to the drive rod 45 and provided at the other end is loosely fitted in the elongated hole 44b. A press-contact spring 48 surrounding the small-diameter portion 44a is provided between the pair of spring receivers 47 inserted into the small-diameter portion 44a.

As described above, the interiors of the device tank 13 including the busbar tank 15, the connection tank 14, and the case 29 are airtightly constructed, and the three spaces are individually filled with insulating gas. ing.

Next, the operation of the circuit breaker will be described. Since the connecting portion between the pair of insulating rods 44 and the driving rod 45 is arranged outside the case 29 and not inside the case 29, the partition plate 43 and the vacuum interrupter are arranged as shown in FIG. The distance L from the case 30 can be reduced, and the total length of the case 29 can be shortened and downsized.

The procedure for replacing the vacuum interrupter 30 is as follows. First, after removing the operating means 28 in FIG. 2 and the pair of levers 46 in FIG. 3, the insulating gas in the case 29 is extracted through a valve or the like (not shown) attached to the partition plate 43. Next, the partition plate 43 is removed, and the bolt 38 shown in FIG. 3 is removed. Then, the pair of vacuum interrupters 30 can be pulled out of the case 29 to the outside by pulling the insulating rod 44 rightward.

Thereafter, a new vacuum interrupter 30
Is attached to the insulating rod 44, the vacuum interrupter 30 is inserted into the case 29 in the reverse order to the above, and then the partition plate 43 is attached. 28 is attached.

Since there is no need to remove the insulating gas from the equipment tank when replacing the vacuum interrupter, there is no need to open the delivery-side switch unlike the prior art.

In this embodiment, the pair of insulating rods is guided to the outside of the case. However, the pair of movable lead rods are connected to a single insulating rod inside the case, and only the single insulating rod is connected to the case. It may be guided to the outside.

[0021]

As can be seen from the above description, claim 1
According to the circuit breaker according to (1), the vacuum interrupters are housed side by side in a case made of an insulating material in parallel, so that the circuit breaker can be downsized, and the gas insulated switchgear can be downsized. In addition, the opening of the tank containing the equipment was closed with a case, and the case was attached to the case with the case positioned inside the tank and the inside of the case opened to the outside of the tank, thereby separating the inside of the tank from the inside of the tank. In this state, the inside of the case can be filled with the insulating gas, and the vacuum interrupter in the case can be replaced without removing the insulating gas in the tank, so that the work of replacing the vacuum interrupter becomes easy. Further, since the vacuum interrupter can be replaced without removing the insulating gas in the tank, there is no need to open the delivery-side switch unlike the related art.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a gas insulated switchgear using a circuit breaker according to the present invention.

2 (a) is a front view, and FIG. 2 (b) is a left side view of FIG. 2 (a), relating to the relationship between the circuit breaker and the operating means according to the present invention.

FIG. 3 is a sectional view showing a configuration of a circuit breaker according to the present invention.

FIG. 4 is a configuration diagram of a gas-insulated switchgear using a conventional circuit breaker.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 13 ... Equipment tank 13a ... Opening 29 ... Case 29b ... Flange part 30 ... Vacuum interrupter 30a ... Fixed lead rod 30b ... Movable lead rod 31 ... Terminal 35 ... Connection conductor 38 ... Bolt

Claims (1)

[Claims] A pair of vacuum interrupters are accommodated in a substantially cylindrical case having a bottom formed of an insulating material, with a pair of vacuum interrupters arranged side by side so that a fixed lead bar is on the bottom side of the case. While providing terminals that penetrate airtightly and individually conduct with the respective fixed lead rods inside the case, the movable lead rods of the vacuum interrupter that are formed of a flexible conductor and make a pair are slidably respectively. A connection conductor having an inserted insertion hole is detachably connected to the inner surface of the case so that the pair of vacuum interrupters are constantly urged toward the bottom surface of the case, and the opening of the tank filled with the insulating gas is connected to the opening. Closed by a case, the case is located inside the tank, and the inside of the case is open to the outside of the tank so that it can be attached to the tank. Circuit breaker that.