JPS61161908A - Cubicle type gas insulated switchgear - 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 [Field of Application of the Invention] The present invention relates to a cubicle-type gas-insulated switchgear [K
related.

[Background of the invention]

When configuring a double bus system using this conventional cubicle type gas insulated switchgear, the main bus and its bus disconnector t? One gas section was used, and electrical connection between the II*a terminals of both busbar disconnectors was made by a connecting device consisting of one bushing provided between both gas sections.

However, after considering various measures to take in the event of an accident, we found that in the configuration described above, if the bushing had to be replaced due to an accident such as dielectric breakdown, the gas compartments of the bidirectional bus would be connected by removing the bushing. As a result, the gas in both gas compartments had to be recovered, and the main bus of both cars had to be stopped, making it impossible to fulfill the role of the double bus system.

[Purpose of the invention]

An object of the present invention is to provide a cubicle type gas insulated switchgear that can prevent simultaneous power outage of both busbars even if an insulation breakdown accident or the like occurs at the electrical connection between the two busbar disconnectors.

[Jg essential for invention]

The present invention is characterized in that the above-mentioned connection device is constructed using two gas compartment insulating members that can be attached and removed from the gas compartments on each main bus bar side.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to FIG.

The bushing 2 connected to the upper terminal Kk of the am circuit breaker 1 is
The opening flange 5 of the upper gas compartment is removably sealed. Further, the bushing 4 connected to the lower terminal of the circuit breaker 1 seals the opening of the intermediate gas compartment 21 via a removable cover plate 7. This opening flange 6 forms a large diameter opening when the contact plate 7 and bushing 4 are removed, and can be used as a working manhole.

The upper gas compartment whitening includes a disconnector 8 having a substantially V-shaped insulating support, one pole of the disconnector is connected to the center conductor of the bushing 2, and the other pole is connected to the cable head 12 and the instrument transformer. It is connected to the device 11. In addition, disconnector 8
Illustrations of the movable element and the operating mechanism are omitted.

A main bus 13 and a bus disconnector IO are configured in the intermediate gas section uij21. One pole of the bus disconnector 10 is connected to the main bus 13 K, and the other pole is connected to the center conductor of the bushing 4.

A main busbar 14 and a busbar disconnector 15 are configured in the lower gas section n. One pole of the bus disconnector 15 is connected to the main bus 14 , and the other pole is connected to the other pole of the bus disconnector 10 . Next, the connection device between the busbar disconnectors 10 and 15 will be explained.

The partition plate located between the middle gas compartment, also known as the lower gas compartment η, has a cylindrical mounting 7 flange 5 with flange surfaces at both ends.
are combined. Intermediate gas compartment 21 of mounting flange 2
On the side, an insulating spacer n with a central conductor is removably connected hermetically. On the other hand, an insulating spacer including a center conductor is removably connected to the lower gas compartment n side of the mounting 7 flange 5 in an airtight manner. Center conductor I
The upper end of the center conductor is connected to the other pole VC of the bus disconnector 10, and the lower end of the center conductor is connected to the other pole of the bus disconnector 15, and the center conductor! The bottom end of the center conductor 4 and the top of the center conductor 4 are connected by a tulip contact. In this way, between the middle gas section 1!1121 and the lower gas section 111122,
The two gas compartments are separated by an insulating spacer field, 24, which is an insulating member, so that a gas compartment 4 is formed between the insulating spacer fields, 24.

Looking at the above-mentioned connection device and the gas compartments in its vicinity, the intermediate gas compartment 1lii21 is connected to the °C pulp 33 via the pulp 31, the gas compartment 3 is connected to the pulp A via the piping chrysanthemum and the pulp filtrate, and the lower gas Section 4 is connected via a valve section, and gas is supplied and discharged. Normally, the pulps 31 and 32 are in an open state and the other pulps 33 and 35 are in a closed state.

The worst accident in a cubicle-type gas insulated switchgear with the above-mentioned configuration was that a flash fault occurred on the inner surface of the insulating spacer n, and the arc caused damage to the insulating spacer, resulting in the side insulating spacer 24 being replaced. I can think of cases where it is necessary.

In this case, first, the circuit breaker 1 and the busbar disconnector 10 and 15 are opened, and the gas sealed in the gas compartment 21 and westward is recovered. Gas recovery from the gas compartments 21, 29 is carried out in a recovery device with the pulp valve open.

Next, pull out the KM disconnector 1 together with the bushings 2 and 4 to the right as shown in the figure, remove the contact plate 7, and obtain a working manhole near the insulating spacer field. At this time, since the gas in the lower gas section m22 remains sealed, the operation of the main bus 14 can be continued, and there is no need to stop only the operation of the raw bus 1s13. Take out the insulating spacer B with the center conductor and Vc9 from the obtained work manhole and replace it with a new insulating spacer 2. After the replacement work is completed, remove the bushings 2 and 4 from the circuit breaker 1, and remove the removed bushing 2. 4 is airtightly connected to the opening 7 lange S and the opening Aranshiro via the contact plate 7, the pulp proverb is closed, and the valve 31 is closed.
Gas is filled into the intermediate gas compartment 21 from 33 and into the upper gas compartment 1120 from pulp (not shown).

In this state, the operation of the main bus 13 is resumed and the operation of the main bus 14 is stopped.

Next, open the pulp word with the pulp 32 closed and check the lower gas compartment? Collect the gas of 2F/'3, remove the plate 16 configured in the lower gas compartment ηi & disconnector 111j to obtain a manhole for ℃ operation, remove the insulating spacer Sae from this working manhole, and install a new insulating spacer. , connect the plate 16 in an airtight manner, close the pulp 31, open the pulps 32, 33, and 35, and open the gas compartment ρ.

Fill the convex circle with gas and block F! A connection is made between the fr unit 1 and bushings 2 and 4.

As can be seen from the above description, it is possible to replace the insulating spacer 24 without simultaneously stopping the two motherboards. Therefore, even in a double bus system in which the main busbar and the busbar disconnector are each configured in the same gas compartment, it is possible to prevent a complete stop and deal with an emergency in the event of an accident.

In the embodiment shown in FIG. 1 described above, the connecting device is composed of the mounting 7 langes δ and two insulating bases 24, but as shown in FIG.
! It is airtightly connected to the partition plate so that it can be installed and removed from the 1121 side, while the lower gas section = 229411
A similar effect can be obtained by airtightly connecting an insulating cover 41 that can be attached and removed from the partition plate, connecting the center conductors 27 and 28 of the two with a tulip contact 26, and forming the gas compartment 4. It will be done. In the end, the screw Wc device may be configured using two gas compartment insulating members that can be attached and removed from the gas compartments 21 and 22 sides, respectively.

〔Effect of the invention〕

As explained above, the present invention provides a connection device between bus disconnectors constructed between one gas compartment including a main bus and a bus disconnector, and the other gas compartment including a main bus and a bus disconnector. The system consists of two gas compartment insulating members that can be installed and removed from each gas compartment side, making it possible to respond to failures of connecting equipment without stopping both main busbars at the same time, resulting in a highly reliable double bus system. A cubicle-type gas insulated switchgear is obtained.

[Brief explanation of the drawing]

Figure m1 is a front view showing a cubicle type gas insulated switchgear according to one embodiment of the present invention, and Fig. 2 is an enlarged view of essential parts of a cubicle type gas insulated switchgear according to another embodiment of the present invention. 1... Circuit breaker, 10... Bus disconnector, 13. ．． 14... Main bus bar, work 5...
Busbar disconnector, 20, 21, Z... Gas compartment, 23.24... Insulating spacer, 6...
...Installation 7 lange, addition...Tulip contact, 27. Out: Center conductor, 4...
・Gas compartment, ah...partition plate. III! !

Claims (1)

[Claims] 1. The main bus and the bus disconnector are each configured in different gas compartments, and the two bus disconnectors are separated gaseously by a connecting device provided between the two gas compartments. In the cubicle-type gas insulated switchgear of the double busbar type, which is electrically connected to the gas compartments, the connecting device has two gas compartment insulating members, and these gas compartment insulating members are respectively attached from the respective gas compartment sides. A cubicle type gas insulated switchgear characterized by being configured to be removable. 2. In the device described in claim 1 above, both the gas division insulating members are arranged facing each other with a gas division formed therebetween, and the electrical connection between the two bus disconnectors is made between the two busbar disconnectors. A cubicle type gas insulated switchgear characterized in that the connection is made via a tube contact provided in a gas compartment between gas compartment insulating members.