JPS60141105A - Gas insulated switching device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] (Technical field) The present invention relates to gas insulated switchgear.

(Prior art) In order to form a switching device such as a circuit breaker or a disconnector in a sealed tank, the counting equipment is stored together with a low-pressure insulating gas (for example, SF, gas) in the tank. Gas-insulated switchgear is generally known, which aims to improve the insulation performance inside the switchgear and reduce the size of the switchgear as a whole (for example,
JP-A-56-10391, No. 0, JP-A-57-3470
No. 5).

However, in these conventional examples, since the breaker is a vacuum breaker, the arc is extinguished in a vacuum, and there is no adverse effect on the surrounding gas. The entire device is made smaller by surrounding it with air.

According to this conventional example, the overall size of the device can be reduced, but the following problems occur.

In other words, the part of the gas-insulated switchgear that most requires inspection is the circuit breaker, but in order to perform inspection work, all the gas in the tank must be removed. In addition, it is necessary to prepare the gas cylinder to which the gas is to be injected, and to carry out various operations related thereto.

Therefore, if the true breaker is further housed in a closed container, it may be possible to eliminate the need to remove all the insulating gas from the tank during inspection.

For example, a row of gas jars, JP-A-57-19
As in the invention of No. 6815, this is a method in which an airtight container is further provided within the tank and a breaker is housed inside this container. According to this, it is clear that there is no gas to be removed during inspection, or only a few gases are needed. However, JP-A-57
- According to the method of No. 196815, if the vacuum breaker is housed in a sealed container, there is an advantage that only a small amount of gas is released, but after inspection, gas must be injected into the sealed container again, so it is not necessary to use a gas cylinder. However, it cannot be said that a sufficient solution has been achieved.

(Object of the Invention) In view of the above-mentioned circumstances, the present invention aims to improve insulation performance by filling dry air without sealing insulating gas into the pole part, while at the same time, it is possible to cut off the dry air supply source. Compression to drive the operating mechanism of the device -? It is an object of the present invention to provide a gas insulated switchgear which can be simply, quickly and easily maintained and inspected by using an air supply source without the need to prepare an insulating gas cylinder.

(Summary of the Invention) Based on the above object, the present invention provides a gas insulated switchgear as described above, in which a vacuum breaker is removably housed in the pole column, and a pipe communicating with the inside of the pole column is provided. A channel is connected to the compressed air supply source, and dry air is injected into the pole column to improve the insulation performance within the pole column. While the dry air can be maintained at a high temperature, the dry air can be obtained simply, quickly and easily by using the compressed air storage tank attached to the switchgear, thus making it possible to accurately perform maintenance and inspection work on the vacuum breaker. This is what I did.

(Example) An embodiment of the present invention will be described below with reference to the drawings.

Fig. 1 is a sectional side view of the insulating gas switchgear, Fig. 2 is a sectional front view, Figs. 3 and 4 are side sectional views of the pole section, and Fig.
The figure is a schematic configuration diagram showing a compressed air supply mechanism. Reference numeral 1 denotes a hollow box-shaped tank, which is constructed and fixed on the ground by means of a leg stand 2 attached and fixed to the tank wall 1aK at the bottom. The tank 1 is a sealed container filled with insulating gas, and the tank wall 1
On a, the pole part 3, the disconnector 4, 4a and the cable 5, 5a are installed.
is stored. The pole column part 3 has a flange part 3a airtightly fixed on the tank wall 1a, a lower insulating cylinder 3b tightly fitted to the sides of the mounting flange 3, and the lower insulating cylinder 3b and the upper insulating cylinder 3d are tightly fitted. It is a closed container consisting of a terminal tube 3c and a terminal lid 3e that covers the upper end of a lower insulating tube 3d, and stores an insulating gas and a switch 13 inside.

Note that 6 and 6a are connection conductors that connect the pole section 3 and the disconnector 4,
4a is connected. 7 is a grounding switchgear and is housed in a case 8 separated from the tank. Reference numeral 7a is a movable piece that rotates and connects the grounding device 7 and the grounding terminal 9. Reference numeral 10 denotes an insulator for insulating and maintaining the couple 5a, and 11 is a flow filter provided at the end of the insulator 10 protruding outside the case 8. Reference numeral 12 denotes a sealable operation box that houses the operating mechanism of the switch 13, and 12a denotes an interlocking box that houses a link mechanism for simultaneously interlockingly operating the three-phase pole column portions 3.

Therefore, the present invention will be explained in detail with reference to FIGS. 3 to 5. 3 and 4, 13 is a vacuum breaker, 13a is an upper terminal of the vacuum breaker 13, 13b is a lower terminal of the vacuum breaker 13, and 14 is a terminal of these terminals 13.
a and 13b are current collector contacts that are removably engaged; 15 is a cover portion of the end cover 3e that supports the current collector contact 14; and 16 is a cover for fixing the terminals 13a and 13b to the terminal cover 3θ and the terminal tube 30, respectively. The support plate 17 is connected to the lower terminal 13b by an insulating connector. 18 is an insulating iron formed integrally with the insulating connector 17; 19 is an insulating connector that connects a part of the operation mechanism 120 built into the operation box 12 and the bottle 2;
Connected via 0. Reference numeral 21 denotes a supply pipe, and in order to feed dry air into the pole column 3, the supply pipe 21 enters the pole column 3 from the mounting flange 12b of the operation box 12 through a hole 1b drilled in the bottom plate 1a. Consists of hollow tubes. Reference numeral 22 denotes an exhaust pipe, which is attached to the mounting flange 121 of the operation box 12 in order to suck in and discharge the air inside the pole column 3.
It consists of a hollow tube that enters the pole section 3 through a hole 1b bored in the bottom plate 1a. The supply pipe 22 and the exhaust pipe 2
2 is a conduit that supplies dry air to the pole column portion 3. 23 is a leakage valve.

In FIG. 5, the compressed 9 air supply machine 424 will be explained as follows.
24a is an air tank. The air tank 24a compresses and stores dry air and is used for operating the vacuum breaker 3. Inject dry air into. 26 is a stop valve, 27 is a pressure reducing valve, 28 is a pressure gauge, and 29 is a safety valve.

On the other hand, 30 is an air compressor, 31 is an oil strainer, 3
2 is a check valve, and 33 is a safety valve that supplies compressed air to the air tank 24 through a pipe 34. In addition, the pipe line 25 is equipped with a dry air drive pressure transducer 34 and a high pressure warning pressure transducer 35.
, pressure conversion bag for low pressure closure and warning [36 and pressure gauge 37
is provided. In addition, 38 is an operating mechanism of the vacuum breaker 13, 39 is a cylinder, 40 is a piston engaged with the cylinder 39, 41 is a piston rod, 42 is a connecting rod connecting the piston rod 41 to the link mechanism 120, and 43
45 is a trip control cylinder, and 46 is a trip control valve.

Therefore, the operation of the present invention will be explained based on the above embodiment.

First, in order to maintain and inspect the vacuum breaker 13, remove the operation box 12 from the bottom plate 1a, pull out the vacuum breaker 13 from the pole column 3, inspect it, repair or replace it, and replace the old operation i12. The attachment is repaired via the attachment portion 12b. Next, the leakage valve 2:3 of the exhaust vibrator 22 is opened, and the stop valve 26 of the conduit 25 is opened via the supply vibrator 21. When dry air flows into the pole column part 3 from the supply pipe 21, the humid air that has entered the pole column part 3 during inspection or replacement is discharged from the exhaust pipe 22 to the pole column part 3.
Expelled outside.

Therefore, by supplying dry air and discharging the air inside the pole column part 3 for a predetermined period of time, the air inside the pole column part 3 is replaced with dry air that is substantially transparent. Then, when a predetermined amount of dry air is sealed in the pole column portion 3 and reaches a predetermined internal pressure, the stop valve 26 of the conduit 25 is closed again. The pressure inside the pole column part 3 is kept the same as the internal pressure of the tank 1.

In addition, a desiccant may be stored in an appropriate location inside the pole column part 3 in order to air dry the inside of the pole column part 3, or according to the present invention described above, a vacuum breaker may be installed inside the pole column part 3. 13 is removably housed, and dry air is sealed inside the pole column 3, so there is no need to fill insulating gas into the pole column 3, there is no need to prepare a gas cylinder, and the dry air can be removed. The air is sealed using the compressed air supply mechanism 24 for operating the vacuum breaker 13, and the filling pressure can be achieved using the internal pressure and static pressure of the tank 1, without increasing the structural strength of the pole column 3. In addition to being cheaper and more economical to manufacture,
The air-tight assembly process of the pole column portion is sufficient, and a leak test is not strictly required, so that the overall effect is economical.

[Brief explanation of the drawing]

FIG. 1 is a sectional side view showing a gas insulated switchgear, FIG. 2 is a sectional view taken along the line A-A in FIG. 3 is a sectional view taken along the line B-B in FIG. 3, and FIG. 5 is a schematic diagram showing the structure of the dry air supply mechanism of the present invention. ■... Tank, 2... Leg stand, 3... Pole column, 12...
...Operation box, 12a...Operation mechanism, 13...Vacuum breaker, 21...Pipe line, 24...Compressed air supply mechanism. Figure 3'M4 figure

Claims (1)

[Claims] A pole column made of an insulating cylinder housing a circuit breaker is fixed to the inside of a tank that is supported on a base and can be sealed, and an insulating gas is filled in the tank, and the pole column is attached to the outer bottom of the tank. In the gas-insulated switchgear, the gas-insulated switchgear is equipped with an operation box that communicates with the pole section, an operation mechanism of the circuit breaker is housed in the operation box, and a compressed air supply mechanism that drives the operation mechanism. A vacuum breaker (to) is removably housed inside (3), while a pipe line Qυ communicating with the inside of the pole column part (3) is led out to the outside of the tank (1), and the pipe line 0
A gas insulated switchgear characterized in that υ is connected to the compressed air supply +19 structure (,!4).