JP2581198B2 - Gas-insulated electrical equipment and gas-insulated compensation reactor for gas-insulated electrical equipment - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas-insulated electric facility including a gas-insulated switchgear and a gas-insulation-compensating reactor, and a gas-insulating-compensating reactor used for the electric facility. It is.

2. Description of the Related Art In electrical equipment such as a substation connected to a long cable, a compensating reactor is installed together with a transformer and a gas insulated switchgear.

As shown in Fig. 5, the compensating reactor GC is a grounding transformer with a star connection on the primary side and a triangular connection on the secondary side.
GT and disconnector DS with one end connected to the neutral point of the grounding transformer
and a grounding switch provided between the other end of the disconnector DSo and ground
It includes an ESo and a compensation reactor CRe having one end connected to the other end of the disconnector DSo. The illustrated compensation reactor CRe integrally includes a neutral point series resistor SNGR, and is grounded via the resistor.

Recently, it has been promoted to reduce the size of substation equipment by achieving gas insulation of switchgear, and accordingly, gas insulation has also been adopted for compensation reactor devices.

Those FIGS. 6 and 7 are showing a configuration of a conventional gas insulated compensating reactor apparatus, in this example, SF ₆ gas is sealed by arranging side by side in a plane of the compensating reactor CRe ground transformer GT The disconnector DSo and the earthing switch ESo are disposed above the compensating reactor CRe. Then, a three-phase cable head CHd connected to the three-phase terminal on the primary side of the grounding transformer is attached to the vessel 2 welded to one side in the width direction of the vessel 1, and the cables connected to these cable heads are separated. It is connected to the cable head of the gas insulated switchgear installed at the position.

[Problems to be Solved by the Invention] In the conventional gas insulation compensation reactor device GC, since the grounding transformer GT and the compensation reactor CRe are arranged in a plane, the length of the container 1 becomes longer and the device becomes larger. There was a problem of shaping.

Also, recently, with the gas insulation of the equipment in the substation, it has become necessary to arrange the gas insulation switchgear and the gas insulation compensation reactor device side by side on the same floor. For example, as shown in FIG. 8, a circuit breaker CB1, disconnecting switches DS11, DS21 and DS3, and earthing switches ES11, ES21 and ES31.
And cable head CHd1, current transformer CT1 and instrument transformer P
Gas insulated switchgear unit GIS1 with T1 and circuit breaker
CB2, a disconnector DS12 and DS22, earthing switches ES21, ES22 and ES32, a cable head CHd2, and a gas insulated switchgear unit GIS2 including a current transformer CT2 and an instrument transformer PT2. Gas-insulated switchgear unit
Compensation reactor GC for GIS1 with cable C and disconnector DS3
In this case, it is preferable to install a compensating reactor GC between the two gas-insulated switchgear units GIS1 and GIS2.

However, in the conventional gas insulation compensating reactor device, the cable head CHd is provided at one end in the width direction of the container 1, so that the width of the device becomes large, and the cable drawing direction is the cable drawing direction of the gas insulated switchgear unit. If a gas-insulation compensating reactor is installed between two gas-insulated switchgear units, the installation area of the whole equipment becomes considerably large, and the size is reduced by adopting gas-insulation. There is a problem that the merit of this cannot be fully utilized.

It is an object of the present invention to provide a gas-insulated electric facility with a reduced installation area and a gas-insulation-compensating reactor device used for the facility.

In this specification, “electric equipment” refers to equipment provided with a gas-insulated switchgear and a gas-insulation-compensating reactor. Generally, necessary equipment such as a transformer is further connected to the electric equipment to form a substation equipment.

Means for Solving the Problems The present invention provides at least one gas insulated switchgear unit configured to house predetermined switchgear in a tank filled with insulating gas, and a gas insulated switchgear unit. The insulating gas is connected between the ground transformer to be connected, the disconnector having one end connected to the neutral point on the primary side of the ground transformer, the compensating reactor provided between the other end of the disconnector and ground, and the grounding switch. The present invention relates to a gas-insulated electric facility including a gas-insulation-compensating reactor device housed in a sealed rectangular container.

In the present invention, the width of the container of the gas insulation compensation reactor device is set substantially equal to the width of the container of the gas insulation switchgear unit, the gas insulation compensation reactor and the gas insulation switchgear unit are arranged side by side, The insulation compensation reactor device and the gas insulated switchgear unit were directly connected via a connection pipe.

The above-mentioned gas insulation compensation reactor device is preferably configured as follows. That is, the grounding transformer is located in the lower part of the container,
The container is housed in a state where its longitudinal direction matches the longitudinal direction of the container, and the primary terminal of the grounding transformer is led out to the side wall of the container located at one end side in the longitudinal direction of the grounding transformer. The compensating reactor is arranged above the grounding transformer, and the disconnector and the earthing switch are arranged above the earthing transformer alongside the reactor.

[Operation] As described above, the gas-insulated compensating reactor and the gas-insulated switchgear unit, whose widths are almost equal, are arranged side by side so that they are directly connected not via a cable but via a connection pipe. Then, the whole equipment can be configured compactly. Further, since the gas-insulated compensation reactor device and the gas-insulated switchgear unit can be connected without using a cable, economical electrical equipment can be provided.

In addition, when the compensating reactor is arranged above the grounding transformer inside the compensating reactor device as described above, the length of the container can be reduced as compared with the conventional device in which both are arranged side by side. The size can be reduced.

Further, when the primary terminal of the grounding transformer is led out to the longitudinal end of the container as described above, the space between the gas insulated switchgear and the gas insulated switchgear is widened when the gas insulated switchgear is installed side by side. Since there is no need, the installation area can be reduced, and the advantage of adopting gas insulation can be utilized.

Embodiment An embodiment of the present invention will be described below with reference to the accompanying drawings.

FIGS. 1 and 2 show examples of the configuration of a gas-insulation-compensating reactor device used in a gas-insulated electrical equipment according to an embodiment of the present invention. In these figures, reference numeral 10 denotes a rectangular parallelepiped supported on a base 11. -Shaped metal container. In the container 10, a grounding transformer GT is housed. The transformer GT has a star connection on the primary side and a triangular connection on the secondary side. This grounding transformer
The GT is housed in the lower part of the container 10 in a state where its longitudinal direction (the direction in which the three-phase windings are juxtaposed) matches the longitudinal direction of the container.

An opening 10b is formed in the side wall 10a of the container 10 located at one end in the longitudinal direction of the grounding transformer GT, and an insulating spacer 12 is formed inside the opening 10b so that the opening is airtightly closed.
Is installed. The insulating spacer 12 is provided with three-phase through conductors 12u to 12w.
The conductors 13u to 13w connected to the primary terminals of the transformer GT are connected to the ends located inside.

In this example, the through conductors 12u to 12w of the insulating spacer 12
The end located outside the container 10 serves as a lead-out portion for the primary terminal of the grounding transformer.

Outside the opening 10b of the container 10, a branch pipe portion 14a protruding from a side surface of the cylindrical cable head container 14 is airtightly connected. The upper and lower ends of the container 14 are lid plates 15 respectively.
A three-phase cable head CHd, which is hermetically closed by a lower cover plate 16 and attached to the lower cover plate 16, is attached. One ends of connection conductors 17u, 17v, 17w are connected to terminals of the U, V, W three-phase cable head CHd, respectively, and the other ends of these connection conductors are through conductors 12u, 12v, 12w of the insulating spacer 12.
(The primary terminal lead-out part of the grounding transformer).

At the upper yoke of the grounding transformer GT, a reactor mounting bracket 18 is fixed to the other end of the container 10 in the longitudinal direction (the side opposite to the opening 10b), and a compensating reactor 18 is mounted on the mounting bracket. CRe is fixed.

Since the compensating reactor CRe is arranged on one side in the longitudinal direction of the container 10, the space S is formed on the side of the compensating reactor.

In the present embodiment, the disconnector DSo is
And a ground switch ESo. In this embodiment, the disconnector D
A movable contact 20 serving as a movable contact of So and a movable contact of the grounding switch ESo is provided, and the movable contact 20 is supported on the ceiling of the container 10 via an insulating support 21. Disconnector fixed contacts 22 and grounding switch fixed contacts 23 are arranged on both sides of the movable contact 20, and these contacts are also supported on the ceiling of the container 10 via insulating supports. The movable contact 20 is configured such that the rod-shaped contact 20a can be displaced to both sides, and the disconnector DSo is closed when the contact comes into contact with the fixed contact 22, and is opened and closed when the contact comes into contact with the fixed contact 23. The ESo is closed.

The movable contact 20 is connected to a non-ground side terminal of the compensation reactor CRe via a connection conductor 24, and the fixed contact 22 of the disconnector DSo is connected to a neutral point of the ground transformer GT via a connection conductor 25. The fixed contact 23 of the ground switch is connected to a ground potential section via a ground wire (not shown).

SF ₆ gas is sealed in the container 10 at a predetermined pressure.

The cable head CHd is connected to a main circuit of a gas insulated switchgear connected to a line via a cable (not shown).

As described above, when the compensating reactor CRe is disposed above the grounding transformer GT, the length of the container 10 can be reduced. In addition, when the primary terminal of the grounding transformer is led out to one end in the longitudinal direction of the container 10 as described above, the width of the container can be reduced, so that the length of the container is shortened. The size of the device can be reduced.

In addition, if the primary terminal of the grounding transformer is led out to one end in the longitudinal direction of the container 10 as described above, there is no need to secure a space for cable routing on the side of the container. When disposing, there is no need to take a large space between the gas-insulated switchgear. Therefore, it is possible to contribute to downsizing of the substation equipment together with the downsizing of the device, and it is possible to take advantage of the adoption of gas insulation.

3 and 4 show two gas-insulated switchgear units GIS1 and GIS2 and the compensating reactor of the present invention arranged on the same floor as shown in the single-line diagram of FIG. 1 shows a configured gas-insulated electrical installation. In this embodiment, a gas insulated switchgear unit GIS1 in which each device shown in FIG.
And GIS2 are arranged side by side at a predetermined interval, and these gas insulated switchgear units are connected via a bus BUS. Although not shown, the bus BUS extends further on both sides of the gas insulated switchgears GIS1 and GIS2, and is connected to a transformer or the like via another gas insulated switchgear. And the electrical equipment shown in FIG. 4 constitutes a substation equipment.

The gas insulation compensation reactor device GC according to the present invention is disposed between the gas insulation switchgear units GIS1 and GIS2.
When the gas-insulated electrical equipment is configured by arranging the compensating reactor of the present invention in parallel with the gas-insulated switchgear, the container
Is set to be substantially equal to the width of the gas insulated switchgear unit. By setting dimensions in this way,
The appearance of the electric equipment can be balanced.

In this embodiment, instead of having the cable head attached to the container 14 of the embodiment shown in FIGS.
A cross-shaped container 30 is connected to the lower end of the container 14, and one end of a horizontal pipe of the container 30 is connected to a compensation reactor connection portion 32 of the gas insulated switchgear unit GIS1 via a flexible tube 31. The disconnecting switch DS3 shown in FIG. 8 is housed in the container 30, and the connecting conductor in the container 14 connected to the through conductor of the insulating spacer 12 is connected to the mains of the gas insulated switchgear unit GIS1 via the disconnecting switch DS3. Connected to the circuit. Container 30 is a stand
Supported on 33. Container 14, container 30, flexible tube
The connection pipe 31 connects the compensation reactor GC and the gas insulated switchgear unit to each other.

As shown in FIG. 3, when the gas-insulated compensating reactor according to the present invention is arranged side by side with the gas-insulated switchgear unit, when the rated capacity of the compensating reactor is further increased, the length of the container 10 is increased. To deal with. In this case, the compensating reactor connection of the gas insulated switchgear unit GIS1 is led out to its longitudinal end (lower end in FIG. 3).

As described above, in the compensating reactor device of the present invention, the connection with the gas insulated switchgear unit may be made by a cable as in the embodiment shown in FIGS. As in the embodiment shown in FIG. When the connection with the gas insulated switchgear unit is made by the connection conduit, it is economical because no cable is used, and a device in harmony with the gas insulated switchgear unit can be provided.

In the above-described embodiment, the lead-out portion of the primary terminal of the grounding transformer is constituted by the insulating spacer 12, but the bushing terminal is attached through the side wall of one end in the longitudinal direction of the container 10, and the bushing terminal is grounded. A connection to an external circuit may be provided as a lead-out portion of the primary terminal of the container.

[Effects of the Invention] As described above, according to the present invention, a gas insulation compensating reactor device and a gas insulation switchgear unit having substantially equal width dimensions are arranged side by side, and a connection pipe is used between the two without using a cable. Since the direct connection is made via the road, there is an advantage that the entire equipment can be compactly configured. Further, since the gas-insulated compensation reactor device and the gas-insulated switchgear unit can be connected without using a cable, economical electric equipment can be provided.

In the gas insulation compensation reactor device of the present invention, the length of the container is shortened by disposing the compensation reactor above the grounding transformer, and the primary terminal of the grounding transformer is connected to one end of the container in the longitudinal direction. Since the width of the container is reduced by being drawn out, there is an advantage that the apparatus can be downsized.

Furthermore, in the gas insulation compensation reactor device of the present invention, by arranging the primary side terminal of the grounding transformer at one end in the longitudinal direction of the container to arrange the gas insulation switchgear side by side, the gas insulation switchgear Since there is no need to take a large space between the two, it is possible to contribute to downsizing of substation equipment, in combination with downsizing of the device, and to take advantage of the adoption of gas insulation. We can make use of it.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of an embodiment of the present invention taken along a horizontal plane and the inside thereof is viewed from above. FIG. 2 is a cross-sectional view of the embodiment taken along a vertical plane as viewed from the front. 3 and 4
5 is a plan view and a front view showing another embodiment of the present invention, FIG. 5 is a connection diagram showing an electric configuration of a compensating reactor device according to an embodiment of the present invention, and FIGS. FIG. 8 is a plan view and a front view showing the gas insulation compensating reactor device, and FIG. 8 is a single-line diagram showing a configuration of a main part of a substation facility provided with the compensating reactor device of the present invention. 10 ... Container, 12 ... Insulating spacer, 13u to 13w ... Connecting conductor, GT ... Ground transformer, DSo ... Disconnector, ESo ... Ground switch, CRe ... Compensation reactor, GC ... Gas insulation Compensation reactor device.

Claims (2)

(57) [Claims] At least one gas-insulated switchgear unit configured to house predetermined switchgear in a tank filled with insulating gas, a grounding transformer connected to the gas-insulated switchgear unit, A disconnector having one end connected to a neutral point on the primary side of a grounding transformer, a compensating reactor provided between the other end of the disconnector and ground, and a grounding switch are provided in a rectangular parallelepiped container filled with insulating gas. A gas-insulated electrical equipment comprising a gas-insulation-compensating reactor device housed in a gas-insulating-compensation reactor device, wherein the width of the container of the gas-insulation-compensating reactor device is set substantially equal to the width of the container of the gas-insulated switchgear unit. The gas-insulated compensating reactor and the gas-insulated switchgear unit were arranged side by side, and the gas-insulated compensating reactor and the gas-insulated switchgear unit were directly connected via a connection pipe. Gas insulated electrical equipment, characterized and. 2. A grounding transformer, a disconnector having one end connected to a primary neutral point of the grounding transformer, a compensating reactor and a grounding switch provided between the other end of the disconnector and ground. In a rectangular parallelepiped container filled with insulating gas, wherein the grounding transformer has a lower portion in the lower portion of the container in a state in which a longitudinal direction thereof coincides with a longitudinal direction of the container. A primary terminal of the grounding transformer is led out to a side wall of the container located at one end side of the grounding transformer in a longitudinal direction, the compensation reactor is disposed above the grounding transformer, and the disconnector And a grounding switch arranged above the grounding transformer and side by side with the reactor.