JPH0140565B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a grounded tank type switchgear. More specifically, it relates to grounded tank-type switchgear that houses circuit breakers, disconnectors, etc. placed in substations, switchyards, etc. in a gas-insulated manner, and is equipped with a grounded tank to which an air bushing is connected. .

This type of switching equipment is configured so that it can be connected to a power transmission/distribution bus, railroad tracks, or other equipment. In addition, even in complex switching equipment in which circuit breakers, disconnectors, earthing switches, etc. are connected and integrated through a grounding tank, an air bushing is installed on the top of the grounding tank to connect it to the air side equipment. is being done.
In such conventional switchgear equipment, it is usually better to support the air bushing by directly attaching it to the disconnector tank, for example, in order to downsize the equipment, rather than providing a grounded tank dedicated to the air bushing. It is often used because it is effective. However, in conventional switching equipment configured in this way, for example, if a problem occurs with the disconnect switch and the disconnect switch is to be replaced, the ground tank and the air bushing must be integrated, and the connected bus bar or It was necessary to remove it from other equipment. In such cases, the rated voltage for air bushing should be 550kV.
Assuming that, the length is 5 to 6 m, the connection with the overhead wire is located approximately 10 m above the ground, and the total weight of the switching equipment is approximately 10 tons, so it will require a large amount of replacement work. It took a lot of effort.

To explain the conventional device as described above in more detail with reference to FIGS. 1 and 2, an air bushing 3 is attached to an upper end flange 2a of a grounded tank 2 erected on a foundation base 1. The head 3b of the aerial bushing 3 is connected to the busbar or railway line by an overhead wire 4. For example, when the rated voltage is 550kV, the height of the head 3b is about 10m from the ground, and the internal conductor 5 connects the fixed contact 6 in the grounded tank 2 and electricity from the head 3b. connected. Further, the ground tank 2 includes a branch pipe 2b, and is connected to a ground tank 7 of another device with a bolt 8. In such a configuration, in order to replace the ground tank 2 in which the disconnector etc. are housed, remove the bolt 8, disconnect it from the other ground tank 7, and connect the overhead wire 4 at the head 3b of the aerial bushing 3. After removing it, the ground tank 2 and air bushing 3 were moved while still connected to each other.

The conventional device is as described above, and as mentioned above, the weight of the aerial bushing 3 is extremely large, and the overhead wire 4 is located at a high place, so it is necessary to use gondolas, hoists, etc. to replace the device. It was a huge undertaking, requiring a lot of effort, and
There were problems in the vicinity of the overhead wire 4, such as the area of the power outage being expanded during the replacement work in order to prevent disturbances due to induction of other busbars and tracks.

This invention aims to solve the problems of the conventional devices as described above, and provides a grounded tank type switchgear that allows the grounded tank to be replaced with the aerial bushing left in place without modifying the conventional device. The purpose is to provide

An embodiment of the present invention shown in the drawings will be described below. FIG. 3 shows an embodiment of the present invention as well as a state when the grounding tank is replaced.
In the figure, a bushing support tank 10 is inserted between the upper end of a grounded tank 2 connected to the foundation base 1 with bolts 9 and the lower end of the aerial bushing 3,
Join. This bushing support tank 10 has bolts 11 and 1 attached to a flange 2a at the upper end of the grounded tank 2 and a flange 3a at the lower end of the aerial bushing 3, respectively.
It has flanges 10a and 10b connected at 2,
It houses an intermediate conductor 13 that connects the internal conductor 5 and the fixed contact 6, and is integrated with a flange 10c that has a through hole for a bolt 14 and is mounted on and coupled to a separately prepared support frame 15. It is designed and constructed according to the concept.

The support frame 15 is prepared separately as a device used when replacing the grounding tank 2, and is attached to the frame material 1.
5a is assembled into a rectangular parallelepiped shape, and its upper surface 15b is joined to the lower surface of the flange 10c, and a bolt 14 is screwed thereto. Further, it is necessary that the left and right side surfaces of the support frame 15 have openings large enough for the ground tank 2 to pass through. As a matter of course, this support frame 15 is not arranged as shown in the figure when the opening/closing device is in constant operation.

Therefore, when replacing the ground tank 2, the support frame 15 is moved on the foundation base 1, inserted into the position of the ground tank 2, and the bushing support tank 10 is replaced.
and then connect it to the flange 10c of the ground tank 2.
Enter the grounding tank 2 through the manhole 2c provided in the tank and remove the intermediate conductor 13 from the internal conductor 5.
Next, the bolts 11 fastening the flange 2a of the ground tank 2 and the flange 10a at the lower end of the bushing support tank 10, the bolts 9 of the foundation base 1, and the bolts 8 connecting the other ground tanks 7 are removed. In this way, the ground tank 2 supports the bushing support tank 10 and the aerial bushing 3 on the supporting frame 15.
You can move it while leaving it on top, so
Move the ground tank 2 to the right and remove it. After removing the ground tank 2, the prepared ground tank is installed and the required connections are made to complete the replacement of the ground tank.Finally, the support frame 15 can be removed.

It is desirable that the support frame 15 has a structure that can be divided into parts to facilitate removal after the replacement of the ground tank 2 is completed. Furthermore, since the support frame can be used commonly for each phase, there is no need to prepare one for each phase, and it is sufficient to prepare several types of frames.

As described above, this invention has a structure that allows the aerial bushing to remain when replacing the ground tank without modifying the conventional equipment, so the efficiency of the replacement work is significantly improved, and the overhead wires can be left connected. Since replacement work can be done at any time, the area of power outage can be kept to a minimum.

[Brief explanation of drawings]

Fig. 1 is a schematic front view of a conventional device, Fig. 2 is a partially sectional front view of the main part, and Fig. 3 is a partially sectional front view of the main part in an embodiment of the present invention, including a mode of replacing the grounded tank. It is a diagram. 1... Foundation base, 2... Grounding tank, 2a... Flange, 2b... Branch pipe, 2c... Manhole, 3... Air bushing, 3a... Flange, 5... Internal conductor, 6
...fixed contact, 7...other grounding tank, 10...
Bushing support tank, 10a, 10b, 10c
...Flange, 13...Intermediate conductor, 15...Support frame.
In each figure, the same reference numerals indicate the same or corresponding parts.

Claims (1)

[Scope of Claims] 1. A grounded tank type switchgear comprising a grounded tank housing a circuit breaker, disconnector, etc. in a gas-insulated manner, and an air bushing connected to the upper part of the grounded tank, wherein the grounded tank and the A flange is integrally provided at the lower part of the air bushing for insertion and connection between the air bushings and for mounting and coupling to a support frame that supports the air bushing when the ground tank is replaced. Grounded tank type switchgear. 2. The grounded tank type switchgear according to claim 1, wherein the flange is integrally provided on the outside of a bushing support tank that is detachably connected to the grounded tank and attached to the lower part of the aerial bushing. 3. The grounded tank type switchgear according to claim 2, comprising an intermediate conductor that connects the fixed contact in the grounded tank housed in the bushing support tank and the internal conductor of the air bushing.