JPH0865830A - Gas-insulated switchgear - Google Patents

Abstract

PURPOSE: To make it possible to execute restoration, checkup or others of a circuit of GIS in a minimum time of service interruption or without service interruption. CONSTITUTION: In GIS equipped with buses 3 and 4, cable heads 7 and circuits 1 and 2 having breakers 8 connected between the buses and the cable heads respectively, a spare circuit 16 having a breaker 19, a spare bus 17 connected with the buses by the spare circuit, and disconnectors 18 connecting the spare bus to the cable heads of the circuits, are provided. At the time when restoration or checkup of the circuits is executed, the cable heads of the circuits are connected to the buses through the intermediary of the spare circuit by connecting the cable heads to the spare bus by the disconnectors. Thereby a time of service interruption of the circuits can be minimized or the service interruption can be dispensed with.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas insulated switchgear (hereinafter referred to as "GIS").

[0002]

2. Description of the Related Art A conventional GIS is shown in FIG. The figure shows GIS
A plurality of lines 1 and 2 are connected to two busses 3 and 4 consisting of an A bus and an Otsu bus.
Units 5 and 6 are connected. Each line 1 and 2 is 2
A circuit breaker 8 connected to the busbars 3 and 4 via disconnecting switches 9 and 10; a cable head 7 connected to the circuit breaker 8 via a disconnecting switch 11; and ground switches 12, 13, and 14, The lightning arrester 15 is provided.

The GPT units 5 and 6 each include a GPT 26 and a ground switch 27.

[0004]

In such a GIS, when the circuit breaker 8 of a certain line, for example, the line 1 fails, the line 1 is out of power during the recovery. Also, since the circuit breaker 8 operates only after an accident occurs,
It may not work even once a year. Since the circuit breaker 8 is an infrequently operating device as described above, the checking operation is performed once a year for inspection. Furthermore, it is necessary to perform a detailed inspection and replace the contacts of the circuit breaker.
During this inspection or replacement, the line 1 must also have a power failure.

As described above, when the line is restored or inspected, the line must be shut down during the period. Moreover, the power outage must be continued until the restoration and inspection work is completed, and thus the power outage time is long. It is an object of the present invention to shorten the power outage time of a line when performing line restoration and inspection in GIS, or to enable line restoration and inspection without interruption.

[0006]

In order to achieve the above object, the present invention provides a gas insulated switchgear having a circuit having a circuit breaker connected to a bus bar and a cable head connected to the circuit breaker. A busbar, a backup line having a circuit breaker connected between the backup busbar and the busbar, and a disconnector connected between the backup busbar and the cable head of the line are provided.

[0007]

When the line is restored and inspected, the cable head of the corresponding line is connected to the spare busbar by the disconnector so that the cable head is connected to the busbar through the spare line. As a result, it is possible to shorten the power outage time of the line for performing line restoration and inspection, or to perform line restoration and inspection without interruption.

[0008]

EXAMPLE An example in which the GIS of the present invention is applied to a 2-matrix GIS will be described below with reference to the drawings. FIG. 1 shows a part of GIS, in which a plurality of lines 1 and 2 are connected to two buses 3 and 4 which are an A bus and an O bus. Further, GPT units 5 and 6 are connected to the two buses 3 and 4, respectively. Further, a backup line 16 is connected to the two buses 3 and 4, and a backup bus 17 is connected to the backup line 16.

Each of the lines 1 and 2 includes a circuit breaker 8 connected to the two buses 3 and 4 via disconnectors 9 and 10, and the circuit breaker 8
A cable head 7 connected to the via a disconnector 11,
The grounding switches 12 and 13 and the lightning arrester 15 are provided.
The backup line 16 is connected to the two buses 3 and 4 via the disconnectors 20 and 21, and is connected to the backup bus 17 via the disconnector 22 and the grounding switch 23, 24, 25.
have.

A GPT 26 and a ground switch 27 are housed in the GPT units 5 and 6, respectively. In the GIS described above, the circuit breaker 19 of the protection line 16 is normally turned off, and the disconnector 18 between the protection bus 17 and each cable head 7 is normally turned off. In this state, the wire connection state is the same as the above-mentioned conventional example.

Next, when the circuit breaker 8 fails in one line, for example, the line 1, the circuit breaker 8, the circuit breakers 9 to 11, and the ground switches 12 and 13 of the line 1 are appropriately turned on or off. As a result, in the line 1, the cable head 7 is separated from the two busbars 3 and 4. After that, the disconnector 18 between the cable head 7 and the backup bus 17 of the line 1 is turned on, and the breaker 19 of the backup line 16 is turned on. As a result, the cable head 7 separated from the bus bar 3 or the bus bar 4 in the line 1 is connected to the disconnector 18,
And the spare bus 17 and the spare bus 16 are connected to the bus 3 or the bus 4. After the work to restore the breaker 8 is completed,
The circuit breaker 8 of the line 1 is turned on, and the circuit breaker 18 and the circuit breaker 19 of the backup line 16 are turned off to restore the normal connection state.

Therefore, after the failure of the circuit breaker 8, the power failure can be resolved before the restoration work is started, so that the power failure time for the restoration work of the circuit breaker 8 is short. Also, when confirming the operation of the circuit breaker 8 of the line 1, or
When performing a precision inspection or replacing the breaker contact,
The disconnector 18 between the cable head 7 and the backup bus 17 of the line 1 is turned on, and the breaker 19 of the backup line 16 is turned on. As a result, in the line 1, the bus bar 3 and the cable head 7 are connected via both the line 1 and the protection line 16.

Thereafter, the circuit breaker 8 and the disconnecting switches 9 to 1 of the line 1
1. The cable head 7 of the line 1 is turned on or off by turning off the grounding switches 12 and 13 as appropriate according to the work.
Is connected to the bus 3 or the bus 4 via the disconnector 18, the backup bus 17, and the backup line 16. After the inspection of the line 1 is completed, the circuit breaker 8 of the line 1 is turned on and the standby line 16
By turning off the circuit breaker 19 of 1, the normal connection state is restored.

Therefore, the confirmation operation on the line 1
Inspections and contact replacements can be performed without interruption. Further, in this embodiment, the lines 1 and 2 are
By sequentially switching to the spare line 16 for work, one spare line 16 can be commonly used for all the lines 1 and 2 to perform inspection work and the like.

[Other Embodiments] The embodiments of the present invention have been described above, but the present invention is not limited to the above embodiments, and various modifications can be made. For example, in the above embodiment, the dedicated protection line 16 is used as the protection line, but if there is a line that is used less frequently among the plurality of lines, it is used without providing the dedicated protection line 16. An unprotected line can be used as a protection line.

Further, in the above embodiment, the protection line 1
Although the GPT unit 6 and the GPT unit 5 are arranged side by side, as shown in FIG. 2, the GPT 26 and the ground switch 27 of the GPT unit 5 can be incorporated in the protection line 16. According to this configuration, the space for installing the GPT unit is effectively used and it is not necessary to newly secure the space for the protection line 16, so that the space for installing the GIS can be reduced. The other parts shown in FIG. 2 are the same as those in FIG. 1 described above, and a duplicate description will be omitted.

Further, in the above embodiment, an example of the two generatrix GIS is explained, but it goes without saying that the present invention can be applied to the single generatrix GIS.

[0018]

According to the present invention, in the GIS, it is possible to shorten the power outage time of the line when the line is restored and inspected, or to perform the line restoration and inspection without interruption.

[Brief description of drawings]

FIG. 1 is a connection diagram of a first embodiment of a GIS of the present invention.

FIG. 2 is a connection diagram of a second embodiment of the GIS of the present invention.

FIG. 3 is a connection diagram of a conventional GIS.

[Explanation of symbols]

1, 2 ... Line 3, 4 ... Busbar 5, 6 ... GPT unit 7 ... Cable head 8, 19 ... Circuit breaker 9, 10, 11, 20, 21, 22 ... Disconnector 12, 13, 14, 23, 24, 25, 27 ... Grounding switch 16 ... Spare line 17 ... Spare bus line 18 ... Disconnector 26 ... GPT

Claims (2)

[Claims] 1. A gas-insulated switchgear comprising a circuit breaker connected to a bus bar and a line having a cable head connected to the circuit breaker, a spare bus bar, and a circuit breaker connected between the spare bus bar and the bus bar. And a disconnector connected between the spare bus and the cable head of the line. 2. A plurality of the lines are provided for the bus bar,
The gas-insulated switchgear according to claim 1, wherein a line that is used less frequently among the lines is used as the backup line.