JPS59113706A - Gas insulated electric 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 The present invention relates to gas-insulated electrical equipment using gas as an insulating medium.

Gas-insulated switchgear installed in substations, etc. is a container that is sealed with insulating gas such as SF, and contains the main body of electrical equipment necessary to configure a switching circuit, such as a circuit breaker, disconnector, and grounding device. Because the device body is isolated from the atmosphere, it does not deteriorate easily over time, resulting in extremely high reliability. However, in conventional devices of this type, the operating devices and control devices necessary to operate the electrical equipment were installed in the atmosphere, so the operating devices could deteriorate due to moisture, dust, ozone, etc. in the atmosphere. Therefore, regular maintenance and inspection was essential.

It is an object of the present invention to provide a gas-insulated type 7 device that prevents deterioration of the operating device over time and eliminates the need for maintenance and inspection or significantly reduces the number of inspections compared to the past.

The present invention is a gas-insulated electric device in which the main body of the electric device is disposed in an insulating gas, and is characterized in that an operating device for operating the main body of the electric device is also disposed in the insulating gas. With this configuration, the operating device can be isolated from the atmosphere, and its deterioration over time can be eliminated.
The amount of maintenance and inspection can be significantly reduced compared to the conventional method.

In this specification, the term "electrical equipment" refers to circuit breakers,
Not only does it refer to a single electrical device that requires operation, such as a disconnector or grounding device, but it also refers to a combination of circuit breakers, disconnectors, grounding devices, lightning arresters, etc. to form a switching circuit in an electrical station such as a substation. It also refers to composite electrical equipment that combines multiple electrical equipment that requires operation, such as a device.

Furthermore, in this specification, the term "operating device" refers to an operating device that operates an electrical device using a driving source such as an air cylinder, an electromagnet, or an electric motor through an operating mechanism consisting of a link mechanism, etc. When a control circuit is provided that performs various control operations by converting a command signal into an electrical signal for operating an operating device, this term is also used to include both the operating device and the control circuit. shall be.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below along with embodiments thereof with reference to the drawings.

FIG. 1 shows an embodiment in which the present invention is applied to a gas-insulated switchgear. In the figure, 1 is a box-shaped airtight container installed on an R-space 2. In FIG. The inside of the container 1 is airtightly partitioned into a first chamber 4 and a second chamber 5 by a partition wall 3 to separate the gas, and SF is contained in both chambers.

It is filled with gas at a predetermined pressure, for example at approximately atmospheric pressure.

Inside the first chamber 4 is a cable head CHd.

Disconnector D 81 r D S2 + gas breaker GCB
, and bus bar BUS are housed together for three phases, and are electrically connected according to the single line diagram shown in FIG.

In FIG. 1, the bus line BUS has three-phase conductors 6u to 6W extending in a direction perpendicular to the plane of the figure, supported by an insulating spacer 7 attached to airtightly close an opening provided in the side wall of the container 1. , conductors 6u to 6W pass through the spacer 7 in an airtight manner and are connected to other equipment. In addition, the cable head CHd is installed by penetrating the bottom wall of the container 1 in an airtight manner,
A cable 9 rising from an underground cable bit 8 is connected to this cable head CHd.

The gas breaker GCB has a fixed electrode and a movable electrode housed together with an arc extinguishing mechanism in a sealed container filled with an arc extinguishing gas such as SF6 gas, and an operating rod 10 for operating the breaker GCB is provided on the partition wall 3. It is led out into the second chamber 5 by slidingly passing through the penetration portion 3A having an airtight structure. Disconnectors DS+ and DS2 are provided to connect between the terminal connected to the movable electrode of the circuit breaker GCB of each phase and the cable pen CHd, and between the terminal connected to the fixed electrode and the conductor of a predetermined phase of the bus bar BUS, respectively. The operating rods 11 and 12 for operating these disconnectors are also slidably inserted into the first chamber 5 through the air-tight structure through-holes 3B and 3C provided in the partition wall 3.

The second chamber 5 houses the operating device 13 of the gas circuit breaker GCB, the disconnecting switch DS, the operating devices 14 and 15 of the DS2, and a control device (not particularly shown) for controlling these operating devices. A lead wire drawn out from this control device is guided to the outside through a bushing 16 which is attached to the bottom wall of the container 1 so as to pass through the bottom wall in an airtight manner. The operating device 13 is connected to the operating rod (
The gas interrupter GCB K is connected via a connecting means) 10, and the operating devices 14 and 15 are connected to a disconnector DS and Dsz via operating rods (connecting means) 11 and 12, respectively. The first chamber 4 has a pressure gauge 17°, a pressure switch 18 and a stop valve 19, and the second chamber 5 has a pressure gauge 20.
A pressure switch 21 and a stop valve 22 are connected, respectively, and are used for charging and discharging gas into the first chambers 4 and 5 and for monitoring the gas pressure. Further, on both end faces of the container 1, hand holes 23 and 24 are provided, which are used when assembling and inspecting equipment in the first chamber 4 and second chamber 5. are always lids 23A and 24A.
It is closed airtight.

As mentioned above, when a circuit breaker or disconnector operating device is sealed in an insulating gas, the operating device is not affected by the atmosphere, so rust due to condensation, deterioration or evaporation of grease, adhesion of dust, ozone, etc. It is possible to prevent the deterioration of parts caused by this, and it is possible to prevent the deterioration of operating devices over time. Therefore, the frequency of inspection of the operating device can be significantly reduced, and maintenance-free operation can be achieved.

As in the above embodiment, the inside of the container 1 is separated by the partition wall 3! If the equipment and the operating device are housed in separate rooms with separate compartments, inspection of the operating device, etc. can be carried out without stopping the operation of the equipment. Even in the unlikely event that an accident occurs inside the container, reliability can be improved because there is no mutual interference between the operating device and equipment.

As in the above embodiment, when the partition wall 3 is provided in the container and the penetration parts 3A to 3C of the connection means for connecting the operating device and the equipment are provided in the partition wall 3, the airtight maintenance structure of these penetration parts 3A to 3C is as follows. , 10,000 - When the inside of the second chamber 5 is inspected, it is sufficient to maintain airtightness only during the inspection, so it is possible to eliminate the penetration part of the conventional highly reliable and expensive airtight structure. can. Furthermore, even if gas leaks from the penetration parts 3A to 3C during operation, there is no risk of an accident because the first and second chambers are filled with the same gas.

Furthermore, since there is no need to separately provide a container for the operating device, external viewing can be simplified and manufacturing can be facilitated.

In the above embodiment, the container 1 is box-shaped, but the structure and shape of the container may be arbitrary. For example, a tank with a circular cross section may be used.

In the above embodiment, the gas pressures in the first and second chambers 4 and 5 are the same, but it is also possible to create a difference in the gas pressures in both chambers.

It is also possible to provide a transparent window in the wall of the container on the side of the second chamber in which the operating device is housed, so that the status of the operating device, such as the open/closed state of the breaker and the disconnector, can be visually checked.

3 and 4 show another embodiment in which the present invention is applied to a gas insulated switchgear, with FIG. 3 showing the internal structure and FIG. 4 showing a single line diagram. In this embodiment, a tubular first container 317 to a fourth container 34 filled with insulating gas are provided. The first container 31 is formed to have a relatively large diameter and is supported on a base 35 with its central axis aligned horizontally. and the second chamber 38 with a partition GCB
, a bushing current transformer CT and a lightning arrester LA are housed,
These are electrically connected according to the single line diagram in FIG. The cable head (CHd) is installed by airtightly penetrating the inclined wall 31A provided at the bottom of one end of the first container 31, and the conductor of this cable head is equipped with a lightning arrester LA.
and one end of each disconnector DS+ are connected. The other end of the disconnector DS for each phase is connected to a terminal connected to the fixed electrode of the gas breaker GCB, and the terminal connected to the fixed electrode of the circuit breaker GCH is connected to the bushing 40 at the center of the current transformer CT. . There is still a grounding device ESW at one end of the disconnector DS1.
A fixed electrode 41 is provided, and a grounding device ESW is constituted by this fixed electrode and a movable electrode 42 supported by a ground potential section. Although FIG. 3 only shows the earth protectors LA and L, the disconnector GCB, and the current transformer CT for two phases, it goes without saying that these devices are also provided for one phase. It goes without saying that the cable head CHd, disconnector DSI, and grounding device ESW are also housed for three phases. A breaker G is provided in the second chamber 38 of the first container 31.
An operating device 43 and its control device for operating the C13, disconnector DS, and grounding device ESW' are housed, and the operating device 43 is connected to a predetermined device via a connecting means 44 that passes through the partition wall 36 in an airtight and slidable manner. It is connected to the.

An opening 45 communicating with the inside of the first chamber 37 is provided in the upper part of the first container 31, and an insulating waveform 46'f supporting the bushing current transformer CT is provided in the opening 45. The lower end of the T-shaped second container 32 is airtightly connected. A third container 33 and a fourth container 34 are hermetically connected to both lateral ends of the second container 32 via insulating spacers 47 and 48, respectively. Conductors 49u to 49w for three phases are housed in the container 32, and the center conductor of the bushing current transformer CT is connected to these conductors. conductor 4
9u to 49w are supported by penetrating the insulating covers 47 and 4B.

The interior of the third container 33 is separated by a partition wall 50 into a first chamber 51 and a second chamber.
The first chamber 51 is divided into a chamber 52 and a disconnector DS.
2, and in the chamber 52 of M2 is the operating device 5 of the disconnector DS2.
3 are stored in each. Disconnector DS2 and operating device 5
3 refers to a connecting means 5 provided through the partition wall 50 in an airtight manner.
Connected via 4. Conductors 49u to 4 in the second container 32 are connected to each fixed electrode of the three-phase disconnector DS2.
9w is connected, and three-phase conductors 55u to 55w of bus bar BUSI are connected to the movable electrode. These conductors are connected to adjacent equipment through a tubular container 56 connected to the side wall of the third container 33 via an insulating spacer.

The inside of the fourth container 34 is divided into a first chamber 58 and a second chamber 59 by a partition wall 57, and a three-phase disconnector DS3 is housed in the first chamber 58. The second chamber 59 houses an operating device 60 of the disconnector D8g, and the operating device 60 is connected to the disconnector DS3 via a connection means provided through the partition wall 57 in an airtight manner. The fixed electrodes of the three-phase disconnector DS3 are connected to the conductors 49u to 49w in the second container 32, and the movable electrodes are connected to the three-phase conductors 61u to 6 of the bus line BUS2.
It is connected to 1w. These conductors are connected to the fourth container 34
A tubular container 62 connected to the side wall of the
It is connected to adjacent equipment through the inside.

Although the gas-insulated electrical equipment of each of the above embodiments is constructed by combining a plurality of devices, the present invention can also be applied to gas-insulated electrical equipment that is composed of a single device.

As an example, FIG. 5 shows an embodiment in which the present invention is applied to a gas breaker, in which the interior of a container 71 is vertically partitioned into a first chamber 73 and a second chamber 74 by a partition wall 72. ing. A breaker section 75 of a gas breaker consisting of a fixed electrode and a movable electrode is housed in the first chamber 73 , and a terminal 76 connected to the fixed electrode of the breaker section 75 and a terminal 77 connected to the movable electrode are connected to the container 71 . It passes through insulating spacers 78 and 79 attached to airtightly close an opening provided in the side wall and is led out to the outside. An operating device 80 is housed in the second chamber 74, and this operating device 80 is connected to the movable electrode of the breaker 75 via an insulated operating member 81 provided through the partition wall 72 in an airtight and slidable manner. has been done. The first chamber 73 and the second chamber 74 are filled with an insulating gas such as SF.

A hand hole 82 is provided in the upper part of the container 71 for assembling and inspecting the equipment in the first chamber 73, and a hand hole 82 is provided in the lower part of the container 71 for assembling and inspecting the equipment in the second chamber 74. A hand hole 83 is provided for carrying out the operation.

In each of the above embodiments, the inside of the container was partitioned into a first chamber and a second chamber by a partition wall, and the equipment was housed in the first chamber, and the operating device was housed in the second chamber. In some cases, the partition wall can be omitted.

As described above, according to the present invention, since the operating device is placed in an insulating gas, the operating device can be isolated from the atmosphere and can be prevented from deteriorating over time, and the frequency of inspection of the device can be significantly reduced compared to the conventional method. There are advantages that can be achieved.

[Brief explanation of drawings]

1 and 2 are a schematic configuration diagram and a single line diagram of a first embodiment of the present invention, respectively, and FIGS. 3 and 4 are a schematic configuration diagram and a single line diagram of a second embodiment of the present invention, respectively. wiring diagram,
FIG. 5 is a schematic diagram of a third embodiment of the present invention. 1.31-34j71...container, 3, 36, 50
. 57.72... Bulkhead, 4.37, 51, 58.73.
...First chamber, 5,38j52,59.74...Second
room, GCB...gas breaker, DS, -DS,...
・Disconnector, ESW...Grounding device, CT...Bushing current transformer, LA...Escaper, CHd...Cable head P0 2nd station 1 \aus

Claims (4)

[Claims] (1) A gas-insulated electrical device comprising an electrical device main body disposed in an insulating gas and an operating device for operating the electrical device main body, characterized in that the operating device is also disposed in the insulating gas. is insulated electrical equipment. (2) The gas insulation according to claim 1, wherein the electrical equipment main body and the operating device are placed in a common container, and the container is filled with the insulating gas. electrical equipment. (3) The interior of the container is gas-divided into two chambers by a partition wall, and the electrical equipment main body is disposed in one of the two chambers, and the operating device is disposed in the other. gas insulated electrical equipment. (4) The gas-insulated electrical equipment according to claim 3, wherein a connecting means for connecting the operating device and the electrical equipment main body is provided to penetrate the partition wall.