JPH10285728A - Gas-insulated switchgear - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce cost with a connection part arranged rationally, reduce its installation space, and minimize the length of a bus by a method wherein, in the connection part of a device body to a plurality of external devices, an in-phase device which constitutes the connection part and the bus are arranged on the same vertical plane. SOLUTION: In a connection part, in one phase, in which a device body is connected to an external device, a cable connection part (a cable head) 1a, cable heads 1b, 1c whose performance is equal to that of the cable head, a disconnector 3, a current transformer 4 and a circuit breaker 5 are arranged on the same straight line. Regarding two other phases, a cable head and a device are arranged similarly on the same straight line. By such an arrangement, a size in a direction perpendicular to an axis, which connects the circuit breaker 5 to the cable head 1a is shortened, and a gas-insulated bus (a bus) in an ordinary device is not required. In addition, since the installation space of the device body is reduced, the length of a bus is made minimum in total, so that the cost of the device body can be reduced.

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, and more particularly to an arrangement of a gas insulated switchgear, a transmission / transformation system, and a connecting portion for connection to a transmission line.

[0002]

2. Description of the Related Art In recent years, in order to efficiently supply power to a metropolitan area, as the tendency to introduce a high-voltage power system directly into an overcrowded urban area and underground has become stronger, it has been necessary to secure an insulation isolation distance. In addition, gas-insulated switchgears have been installed to minimize the grounding space of equipment.

This gas insulated switchgear is configured by connecting a plurality of gas insulated devices each containing a conductive portion in a grounded tank filled with a gas having an excellent arc extinguishing performance such as SF6 gas. . Gas-insulated switchgear is also highly reliable and can be installed on a smaller scale, and as power demand in large metropolitan areas increases in capacity and density, it has rapidly spread to transmission and substations in the area. It is being advanced.

FIG. 3 is a diagram showing the arrangement of a conventional gas insulated switchgear, other equipment of a transmission and substation system, and a connection portion between the transmission line and the power transmission and transformation system. In the figure, a transmission line and a gas insulated switchgear are connected by a cable connecting portion 1a (hereinafter, referred to as a cable head), and further, a circuit breaker is connected via a lightning arrester 8, an instrument transformer 7, a disconnecting switch 3, and a grounding switch 2. 5 is connected.
The other end of the circuit breaker 5 is a gas-insulated bus (hereinafter referred to as a bus).
9b, and the bus 9b is connected to the cable head 1a,
An instrument transformer 7, a lightning arrester 8, a disconnector 3, and a straight line connecting the grounding switch 2 are arranged in a direction perpendicular to the axis.
After being connected to the earthing switch 2a, a direction perpendicular to the bus 9b,
That is, by connecting to the cable head 1b on an axis parallel to the linear axis represented by the cable head 1a, it is connected to an external device.

[0005]

The conventional gas insulated switchgear as described above has a problem in that external devices are not considered from the viewpoints of a connection portion with an external device, an installation capacity of an internal device constituting the gas insulated switchgear, an insulation distance, and the like. Alternatively, when connecting to a transmission line or the like, a configuration is adopted in which a bus 9b is connected in a direction perpendicular to a linear axis represented by the cable head 1a, and a connection portion for connecting to an external device is provided perpendicularly to the axis of the bus 9b. Have been.

In such a gas insulated switchgear, the space between the axes parallel to the linear axis represented by the cable head 1a is minimized from the viewpoint of minimizing the installation space of the equipment and minimizing the busbar length. The length has been reduced as much as possible and the installation space has been reduced. However, in recent years, the need to further minimize equipment has arisen due to the installation of underground substations, etc.
In addition, there has been a strong demand for a reduction in the cost of the switchgear by reducing the amount of equipment.

The present invention (corresponding to claims 1 to 3) provides
In view of the above situation, the purpose is to rationally arrange the connection between the gas insulated switchgear and its external equipment,
It is an object of the present invention to provide a gas insulated switchgear that can reduce the installation space of a connecting portion and minimize the busbar length and can reduce costs.

[0008]

In order to achieve the above object, a first aspect of the present invention is a gas insulated apparatus comprising a conductive portion housed in a grounded tank filled with a gas having excellent insulation extinction properties. Are connected to form a gas-insulated switchgear body,
In the gas insulated switchgear having a connecting portion for connecting the gas insulated switchgear body and a plurality of external devices, the in-phase device and the bus constituting the connecting portion are arranged on the same vertical plane.

According to a second aspect of the present invention, there is provided the gas insulated switchgear according to the first aspect, wherein a bushing is connected to the air transmission line as the connection portion, and an external device such as a transformer or a phase adjusting device is provided. Is characterized by using a gas-insulated bus.

According to a third aspect of the present invention, in the gas insulated switchgear according to the first aspect, at least one of a disconnecting switch, a grounding switch, a surge arrester, a transformer for an instrument, and the like is provided near the connection portion. It is characterized by being installed.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a configuration diagram of a first embodiment (corresponding to claim 1) of the present invention, wherein FIG. 1 (a) is a plan view and FIG. 1 (b) is a side view.

As shown in FIG. 1, in this embodiment, a one-phase connecting portion for connecting the gas insulated switchgear body and external equipment includes a cable head 1a and a cable head 1b having the same performance as the cable head 1a. 1c, the disconnector 3, the current transformer 4, and the circuit breaker 5 are arranged on the same straight line. Similarly, the cable heads and devices for the other two phases are arranged on the same straight line.

Therefore, according to the present embodiment, the circuit breaker 5
The dimension in the direction perpendicular to the axis connecting the cable head 1a and the cable head 1a can be reduced, and the bus 9b in the conventional device is not required. Scaled down. In addition, since the length of the bus constituting the gas insulated switchgear is reduced overall, the cost of the device body is also reduced.

FIG. 2 is a side view of a second embodiment (corresponding to claim 2) of the present invention. As shown in the figure, in this embodiment, a bushing 6 is used instead of the cable head 1a for connection to an air transmission line, and a cable head 1b is used for connection to an external device such as a transformer or a phase adjusting device. Gas-insulated busbar 9 instead
Is used for the connection part. The current transformers 4, circuit breakers 5, bushings 6, instrument transformers 7, lightning arresters 8, gas-insulated buses 9 and the like having the same phase are arranged on the same straight line as in the above embodiment.

As described above, in this embodiment, when the gas insulated switchgear body is connected to an external device, a power transmission line and the like, there are bushings and gas insulated buses in addition to the cable head. The bushing 6 and the gas-insulated bus 9 are used. Therefore, the length of the bus constituting the gas insulated switchgear is reduced overall, so that the cost of the device body is reduced.

As a modification of the present embodiment (corresponding to claim 3), in the arrangement shown in FIG. 2, a disconnection which is a component device of the gas insulation device is provided near a connection portion connecting the gas insulation switchgear and an external device. At least one of a switch, an installation switch, and an instrument transformer is arranged.

As described above, the gas insulated switchgear is not limited to the switch, but is composed of the transformers such as the instrument transformer and the lightning arrester. By installing these devices near the connection, the installation space is rationalized. it can.

In the first embodiment shown in FIG. 1, the disconnecting switch 3 and the earthing switch 2 are installed near the cable head 1c, and the earthing switch 2, the disconnector 3 and the instrument transformer are installed near the cable head 1b. Although the current transformer 4 is installed in the second embodiment shown in FIG. 2, in addition to the above, the instrument transformer 7 and the lightning arrester 8 are installed, and the installation space for the gas insulated switchgear is reduced. The total length of the gas-insulated bus constituting the gas-insulated switchgear can be reduced.

[0019]

As described above, the present invention (Claim 1)
According to claim 3), the installation space of the gas-insulated switchgear can be reduced by rationally arranging the connection between the gas-insulated switchgear and its external device, and furthermore, the gas-insulated switchgear. By reducing the total length of the gas insulated bus constituting the above, it is possible to provide a gas insulated switchgear which can reduce the installation space of the connection portion and minimize the bus length and can reduce the cost.

[Brief description of the drawings]

FIGS. 1A and 1B are configuration diagrams of a first embodiment of the present invention, wherein FIG. 1A is a plan view and FIG. 1B is a side view.

FIG. 2 is a side view of a second embodiment of the present invention.

FIG. 3 is a plan view of an external connection device of a conventional gas insulated switchgear.

[Explanation of symbols]

1a, 1b, 1c: Cable head, 2, 2a: Ground switch, 3, 3a: Disconnector, 4: Current transformer, 5: Circuit breaker, 6
... bushing, 7 ... instrument transformer, 8 ... lightning arrester, 9, 9
a, 9b: Gas-insulated bus bars.

Claims (3)

[Claims] A gas-insulated switchgear body is formed by connecting a plurality of gas-insulated devices each having a conductive part housed in a ground tank filled with a gas having excellent arc-extinguishing properties. A gas insulated switchgear having a connecting portion for connecting an apparatus main body and a plurality of external devices, wherein an in-phase device and a bus constituting the connecting portion are arranged on the same vertical plane. 2. The gas-insulated switchgear according to claim 1, wherein a bushing is used as the connection part to connect to the air transmission line, and a gas-insulated bus is used as external equipment such as a transformer and a phase adjustment facility. A gas insulated switchgear, characterized in that: 3. The gas-insulated switchgear according to claim 1, wherein a disconnecting switch, a grounding switch, a lightning arrester,
A gas-insulated switchgear, wherein at least one device is installed out of an instrument transformer or the like.