JPH0398221A - Gas insulation switchgear - Google Patents

Abstract

PURPOSE:To facilitate inspection and replacement of parts of a circuit-breaker by forming a working hole in the vicinity of a fixed side unit in a tank, and by inserting a fixed side conductor in a free sliding manner into a inserting hole formed in the fixed side unit, so as to connect both of them with one another. CONSTITUTION:In the vicinity of the upper part of a circuit-breaker 2 in a circuit-breaking tank 14, a manhole 20 is formed as a working hole, and it is covered with a lid. The circuit-breaker 2 is provided between a fixed side conductor 22 connected with a load bus 42 and a moving side conductor connected with a power source bus 41. The circuit-breaker 2 is composed of a fixed side unit 23 and a moving side unit 24. The fixed side unit 23 is composed of a connection fitting 25, a contact case 26, a fixing arcing contact 27, and so on. The connection fitting 25 is provided so as to connect the fixed side conductor 22 with the contact case 26, and has, in the upper part, an inserting hole 25a for inserting the fixed side conductor 22, which is inserted, in a free sliding manner, into the inserting hole 25a through a ring contact 29.

Description

[Detailed Description of the Invention] A. INDUSTRIAL APPLICATION FIELD OF THE INVENTION The present invention relates to a gas insulated switchgear that facilitates circuit breaker inspection and parts replacement.

B. Summary of the Invention The present invention provides a circuit breaker consisting of a fixed unit connected to a fixed conductor and a movable unit connected to a movable conductor in a tank filled with insulating gas. In gas insulated switchgear, a working hole is formed near the stationary side unit in the tank and closed with a lid, and the stationary side conductor is slidably inserted into the insertion hole formed in the stationary side unit to connect the two. This makes it easy to inspect the circuit breaker and replace parts using the work hole.

C. 2. Description of the Related Art First, the connection state of a gas insulated switchgear unit (hereinafter simply referred to as a unit) will be explained with reference to FIG. Although the figure shows the connection per single wire, each unit is provided with three phases. There are also two main buses la and Ib, one of which is the main line and the other is an auxiliary line used for emergency use in the event of a power outage or the like. In the figure, 2 is a breaker, 3 is a current transformer, 4 is a cable head for connecting to a load, 5 is a lightning arrester, 6 is a voltage transformer, 7a to 7C are grounding devices, 8
A to 8d are Shinroki.

Next, a gas insulated switchgear (hereinafter simply referred to as the device) consisting of a unit with such wiring connections is shown in FIGS. 5(a) to (c).
The explanation will be based on. As shown in the figure, the device is constructed by connecting a plurality of units IOa, 10b, . . . in one direction.

Each unit has the same structure, for example, unit IO
a is as shown in FIG. 5(b). As shown in the figure, a breaker block +2a, a main bus block 12b, and a line side block 12c are formed on the base II. The cutoff block 12a is connected to the frame 13 on the base 11 and the frame 13 on the base 11.
Consists of upper cutoff tank 14, etc., and track side block 12
C consists of a cable support frame I5 of the base 11-L, a cable tank 16, etc. The main busbar block 12b includes conduits 17a and 17b extending in a direction perpendicular to the plane of the drawing, and a conduit 17.
a. 17b and is connected at right angles to the cutoff tank l.
4, and conduits 18a and 18b connected to the pipes 18a and 18b.

In the conduits 17a and +7b, main bus lines l3a and Ib for three phases are arranged in a direction perpendicular to the plane of the paper, respectively, and main bus lines Ia,
Ib is connected to the cable tank 16 via the cutoff tank 14.
guided inward. Disconnectors 8a and 8b connect pipes 17a and 17
breaker 2, current transformer 3, and grounding device 7a.
, 7b are provided in the breaker tank 14, and the disconnector 8c,
8d, grounding device 7C. The lightning arrester 5 is provided in a cable tank 16, the voltage transformer 6 is provided in an auxiliary tank (not shown), and the cable head 4 for connecting the load bus 27 is provided in the cable support frame 15.

The units configured in this manner are connected by connecting the conduits 17a and 17b to each other.

D. Problems that the invention aims to solve However, there are the following issues.

4. Since the arc generated when the circuit breaker interrupts short-circuit current etc. directly touches each component, the interrupting performance deteriorates when the number of interrupts reaches a certain value. Therefore, it may be necessary to inspect the circuit breaker and replace parts.

However, in recent years, circuit breakers have been miniaturized and current transformers, grounding devices, etc. are placed in the open space of the circuit breaker tank, and it is not easy to inspect or replace the circuit breaker through the upper manhole 19.

In addition, since the circuit breaker is arranged for three phases all at once, insulating gas heated by the arc does not deteriorate the phase-to-phase insulation between the three phases and the ground-to-ground insulation between the circuit breaker and tank.
The insulating tube is covered over the circuit breaker for each phase, making inspection and replacement more difficult.

There is also a structure in which the entire circuit breaker is taken out of the circuit breaker tank for inspection and replacement of parts, but this has the problem of complicating the structure.

Therefore, an object of the present invention is to provide a gas insulated switchgear that solves the above problem.

E. Means for Solving the Problems The structure of the present invention to achieve the above object is to provide circuit breakers for three phases inside a tank filled with insulating gas, and each circuit breaker is connected to a movable conductor. In a gas-insulated switchgear, the gas-insulated switchgear is composed of a movable unit connected to a conductor, a fixed unit connected to a fixed conductor, and an insulating tube surrounding the opposing parts of the fixed unit and movable unit. A working hole is formed near the fixed side unit in the tank and closed with a removable lid, and the fixed side conductor and the fixed side unit are connected by sliding the fixed side conductor into the insertion hole formed in the fixed side unit. It is characterized by having been inserted through it.

F. When inspecting the circuit breaker, etc., open the lid to open the work hole, move the fixed unit along the fixed conductor, and create a space between the fixed unit and the movable unit. Use the available space to disassemble the circuit breaker components, take them out of the tank through the work hole, and inspect them.

After inspection, replace the defective parts and assemble the circuit breaker in the tank by reversing the above procedure.

G. EXAMPLES Hereinafter, the present invention will be explained in detail based on examples shown in the drawings.

(a) Configuration 7 of Example The configuration of the gas insulated switchgear according to the present invention is shown in FIGS. 1 to 2.
This will be explained based on the diagram.

As shown in FIG. 2, in the present invention, the grounding device 7a is disposed at the upper left inside the breaker tank 14, which is the position where the power bus 41 for three phases and the load bus 42 approach each other, and the grounding device 7a,
7b are provided in close proximity.

A manhole 20 serving as a working hole is formed near the top of the circuit breaker 2 in the cutoff tank 14, and the manhole 20 is covered with a lid 21.

On the other hand, the circuit breaker 2 is configured as follows. Load bus 4
A circuit breaker 2 is provided between a fixed conductor 22 connected to the power supply bus 2 and a movable conductor (not shown) connected to the power supply bus 4l. The circuit breaker 2 has a fixed side unit 23 and a movable side unit 2.
It consists of 4.

The fixed side unit 23 is composed of a connecting fitting 25, a contact case 26, a fixed arcing contact 27, and the like. The connection fitting 25 is for connecting the fixed side conductor 22 and the contact case 26, and has an insertion hole 25a in the upper part for inserting the fixed side conductor 22, and a ring contact 29 is inserted into the insertion hole 25a. Fixed side conductor 22
is slidably inserted. The contact case 26 is attached to the lower surface of the connection fitting 25 via a bolt (not shown). The contact case 26 has a hollow part 30 that opens downward, and the fixed arcing contact 2 is screwed into the contact case 26 in the center of the hollow part 30.
7 is provided. The upper part of a cylindrical fixed main contact 28 is buried in the lower surface of the contact case 26. In addition, 3
1 is a spring, and 32 is a shield.

The movable unit 24 is configured as follows. A piston body 34 is attached to a movable conductor (not shown) via a hollow connecting fitting 33. A hollow drive shaft 35 is slidably provided in the piston body 34, and its lower end is operatively connected to a drive means (not shown). and,
A pipe-shaped movable arcing contact 36 is screwed into the tip of the drive shaft 35. A puffer cylinder 37 is attached to the tip of the drive shaft 35, and a piston body 34a of the piston body 34 is slidable within the puffer cylinder 37. A movable main contact 38 that fits into the fixed main contact 28 is provided on the upper surface of the puffer cylinder 37.
is screwed, and the insulating nozzle 39 is fitted into the movable main contact 38. As a result, a discharge path 41 is formed between the insulating nozzle 39 and the movable arcing contact 36 for discharging the insulating gas from the puffer chamber 40 in the puffer cylinder 37 via the insulating nozzle 39. In order to prevent interphase insulation and ground insulation from deteriorating due to the arc generated between the fixed arcing contact 27 and the movable arcing contact 36, an insulating cylinder 45 is connected with a bolt between the contact case 26 and the piston body 34.
is provided. Note that 46 is a current-carrying contact.

Note that the number of working holes is not limited to one, and a plurality of holes may be formed.

(b) Function of the Example Next, the function of the gas insulated switchgear is shown in Fig. 3 (a) to (f).
The explanation will be based on.

To inspect circuit breaker 2 or replace parts, open lid 2l11. This is done after removing the manhole 20 and opening it.

First, as shown in FIG. 3(a), by removing the bolt, the connection fitting 25 released from the contact case 26 is pushed upward. Then, since it is slidable relative to the fixed conductor 22, the connecting fitting 25 rises and stops at that position. Next, as shown in FIG. 3(b), the contact case 26 is removed from the insulating cylinder 45 by removing the bolts. After this, as shown in FIG. 3(c), use a longer screwdriver 43.
Turn the screw using a screwdriver to remove the movable main contact 38 and the insulating nozzle 39 together, and unscrew the movable arcing contact 36 to remove the movable arcing contact 36 from the drive rod 35 as shown in FIG. Remove.

Next, as shown in FIG. 3(e), remove the bolt 12, remove the insulating cylinder 45 from the piston body 34, and take it out of the isolation tank 14. Finally, as shown in FIG. 3(f), the puffer cylinder 37 is removed from the piston body 34a.

After the parts have been taken out of the cutoff tank I4, each part is inspected, defective parts are replaced, and then assembled into the cutoff tank 14 in the reverse order.

Fixed arcing contact 27, movable arcing contact 3 whose performance tends to deteriorate due to repeated breaking operations
6. The insulating nozzle 39 can be installed without removing the insulating tube 45.
It can be removed and inspected.

In addition, even if you want to inspect or replace the current-carrying contact 46 attached to the puffer cylinder 37, the insulating tube 4
This can be done easily by removing 5.

H. Effects of the Invention As can be seen from the above explanation, the gas insulated switchgear according to the present invention has the following effects.

(a) A working hole is formed near the fixed side unit of the circuit breaker in the tank and is covered with a lid, so even if there is a grounding device or current transformer inside the tank, it is possible to open it from the working hole without removing it. The circuit breaker can be disassembled and each component can be taken out of the tank. Therefore, the circuit breaker can be inspected and parts replaced easily.

(b) Since the fixed unit can be moved along the fixed conductor, only those parts whose performance is likely to deteriorate due to repeated interruption operations can be taken out of the tank through the work hole for inspection. Furthermore, since the circuit breaker is disassembled little by little inside the tank, no work space is required, unlike when the entire circuit breaker is taken out of the tank and disassembled.

[Brief explanation of drawings]

1 to 3 relate to an embodiment of the gas insulated switchgear according to the present invention, and FIG. 1 is a detailed view of section A in FIG.
The figures relate to the configuration of the gas insulated switchgear, and FIG. 2(a) is a front view, FIG. 2(b) is a view taken along arrow rr in FIG. 2(a), and FIGS. 3(a) to (3). f) is an explanatory diagram of the operation, Fig. 4 is a wiring diagram of a gas insulated switchgear unit, Fig. 5 is related to a conventional gas insulated switchgear, Fig. 5(a) is a plan view, and Fig. 5(b) is a front view. 5(c) is a view taken along the line nn in FIG. 5(b). 2... Circuit breaker, 14... Breaking tank, 20... Manhole, 21... Lid, 22... Fixed side conductor, 23
...Fixed unit, 24...Movable unit, 25.
...Connection fittings, l5 25a...insertion hole, 45...insulation tube. I6 2 people Fig. 1 JP-A-3 98221 (6) JP-A-3 - 98221 (7) Fig. 5 Gas station East closed closing lever 0 configuration area (Junior US) (C) O5 flash (b) OI [ -I1 Marugenzu (a) Senmen E (b) Front palanquin

Claims (1)

[Claims] (1) A three-phase circuit breaker is installed inside a tank filled with insulating gas, and each circuit breaker consists of a movable unit connected to the movable conductor and a fixed unit connected to the fixed conductor. In a gas insulated switchgear consisting of an insulating tube surrounding the opposing parts of the fixed side unit and the movable side unit, a working hole is formed near the fixed side unit in the tank and a removable lid is provided. A gas-insulated switchgear characterized in that the fixed-side conductor and the fixed-side unit are connected by slidingly inserting the fixed-side conductor into an insertion hole formed in the fixed-side unit.