JPH0683526B2 - Switchgear for generator main circuit - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a generator main circuit switchgear, and particularly to simplifying the structure of a disconnecting section tank of a tank storage type disconnector,
In addition, the present invention relates to a generator main circuit opening / closing device suitable for preventing rusting inside the tank.

[Conventional technology]

A conventional generator main circuit switchgear is disclosed in Japanese Patent Laid-Open No. 58-9511, in which the inside of the disconnect tank is filled with an insulating gas such as SF ₆ gas and sealed. A method of preventing rusting is known.

In this conventional device, the disconnector movable contactor is arranged in the container in which the insulating gas is sealed so as to face the disconnector fixed side contactor,
The movable contact is connected to an operating lever pivotally supported by an operating shaft via an insulating rod, and the operating shaft is rotated by an operating device provided outside the container, whereby the movable lever is connected via the operating lever and the insulating rod. The movable contact is moved to form a disconnection portion, and at the same time, the movable contact is connected to the fixed contact of the grounding switch, so that the conductor is grounded. And in this gas-sealed switchgear,
It was necessary to use an insulating gas such as SF ₆ gas in order to prevent rusting inside the disconnection section and to make the inside of the disconnection section tank a sealed structure.

[Problems to be solved by the invention]

However, in such a device, in order to prevent rusting, the disconnector tank must be filled with an insulating gas such as SF ₆ gas and the inside of the tank must have a sealed structure. This must be taken into consideration, and since the insulating gas used inside the tank is also expensive, there is a drawback in that it becomes expensive as a whole. Further, there is a drawback in that the concentration of the insulating gas is lowered due to the fatigue of the device itself due to aging, and the rusting inside the tank cannot be expected sufficiently.

[Object of the Invention]

It is an object of the present invention to provide a switchgear for a generator main circuit which simplifies the structure of a tank for a disconnecting switch, and which is inexpensive, prevents rusting inside the tank, and has a good heat dissipation effect. .

[Means for solving problems]

The present invention is intended to prevent rusting in the disconnecting section tank by constantly ventilating a small amount of the compressed circuit breaker operating gas into the disconnecting section tank. That is, the present invention includes a pressure switching device that adjusts the pressure of the compressed gas (compression chamber air or the like) generated by the compressed gas generator, and a shutoff device that stores the compressed gas adjusted by the pressure switching device. Main circuit having a disconnector provided with a regulator, an adjusting unit for adjusting the flow rate of the compressed gas supplied by the circuit breaker, and an exhaust unit for discharging the compressed gas adjusted by the adjusting unit Switchgear for
The compressed gas whose pressure has been reduced by the adjusting means is caused to flow into the disconnector to forcibly circulate the compressed gas.

〔Example〕

 Examples of the present invention will be described below.

FIG. 1 is a front view and a side view of a generator main circuit switchgear according to the present invention.

In the figure, a circuit breaker 9 is composed of a circuit breaker tank 2 and a circuit breaker operating device 6, and a bushing 1 is connected to the current input side end of the circuit breaker tank 2. The blocking unit 4 is arranged in the axial direction of the blocking unit tank 2. The interrupting unit 4 transmits the power generated by the circuit breaker operating unit 6 to the movable interrupting unit through a link mechanism (not shown) between the movable interrupting unit and the stationary interrupting unit (not shown). It is opened to cut off the current.

Further, the disconnector 8 is composed of the disconnector tank 3 and the disconnector operating device 7, and a known ground switchgear including a contactor, a conductor and the like is housed in the disconnector tank. Further, at the current output side end of the disconnecting section tank 3,
The bushing 1'is connected. The current input from the bushing 1 is output from the bushing 1 ′ via the shutoff unit 4 and the shutoff unit 5 axially arranged in the shutoff unit tank 3 connected to the shutoff unit 4. The disconnector 8 is opened by transmitting power generated by the disconnector operator 7 to the movable disconnector through a link mechanism (not shown) between the movable disconnector and the fixed disconnector not shown. And the circuit is disconnected.

The decompressed compressed air 12 is constantly filled in the disconnecting tank 3 of the disconnecting device 8. The compressed air 12 is branched between the circuit breaker operating device 6 and the disconnecting device operating device 7. The disconnector tank 3 via the air pipe 10 'and the air ring valve 11 arranged at the lower end of the current output side end of the disconnecting tank 3
Supplied within.

The compressed air 12 is exhausted from a lower portion of the disconnecting section tank 3 through a duct (not shown) provided in a lower portion of the disconnector operating device 7.

Next, the operation will be described.

The compressed air 12 is generated by the compressed air generator 13, and the compressed air 12 connects the one end of the compressed air generator 13 and the pressure switching device 14 in the circuit breaker operating device 6 with air piping.
After being supplied to the pressure switchgear 14 by means of 10, it is supplied to the disconnecting part tank 3 by means of the air pipe 10 'and the air ring valve 11 via the air tank 15 in the circuit breaker operating device 6. The decompression adjustment of the compressed air 12 is performed by adjusting means provided in the compressed air generating device 13, the pressure switching device, etc., and the delivery flow rate thereof can also be adjusted by the adjusting means provided in the air tank air ring valve or the like. . Air ring valve
The compressed air supplied through 11 is exhausted from the lower duct of the disconnector operating device 7, so that a small amount of decompressed compressed air is constantly aerated in the disconnector tank 3.

〔The invention's effect〕

As described above, according to the present invention, it is not necessary to have a sealed structure using an insulating gas such as SF ₆ gas as in the conventional device, so that the disconnection section tank does not need to have an airtight structure. It can be simple and inexpensive. Also, since the compressed air in the disconnecting section tank is decompressed, the compressed air can be forcibly circulated by the air ring valve to radiate the heat generated by the conductor by natural convection, which also improves the heat dissipation effect. It can also be dehumidified. Dehumidification in the disconnecting section tank can prevent rusting inside the tank and dew condensation on the surface of the insulator, and can provide a highly reliable switchgear. Further, according to the present invention, since it is not necessary to have an airtight structure unlike the conventional device and only the decompression adjustment of the compressed gas is required, the adjustment can be performed easily, and the fatigue of the device is not considered so much. Good.

[Brief description of drawings]

1 (a) is a front view of a switchgear for a generator main circuit, FIG.
FIG. 2B is a side view, and FIG. 2 is an air system diagram of the generator main circuit switchgear. 1 ... Bushing, 2 ... Breaker tank, 3 ... Disconnector tank, 4 ... Breaker, 5 ... Disconnector, 6 ... Circuit breaker operator, 7 ... Disconnector operator, 8 ... Disconnector, 9 ...
Circuit breaker, 10 ... Air piping, 11 ... Air ring valve, 12
...... Compressed air, 13 ...... Compressed air generator, 14 ...... Pressure switch, 15 ...... Air tank.

Claims (1)

[Claims] 1. A circuit breaker having a breaker housed in a container, an operating device for the breaker, a disconnector having a disconnecting part connected to the breaker in a container, and an operating device for the disconnector. In a switchgear provided with, in the container of the circuit breaker, the pressure switchgear for adjusting the pressure of the compressed gas generated by the compressed gas generator and the pressure switchgear is adjusted, and the operating source of the operating device of the circuit breaker. And a tank for storing the compressed gas, the tank and the container of the disconnector are connected by a pipe having a flow rate regulator, and the exhaust means for discharging the air inside the container of the disconnector. An opening / closing device characterized by being provided with.