JP2008283772A - Gas-insulated switchgear - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a compact gas-insulated switchgear which is obtained by constructing and connecting a bus-side equipment unit, a circuit breaker unit, and a line-side equipment unit in this order, the circuit breaker unit being constructed by disposing a bus-side current transformer in the upper part of a circuit breaker arc extinguishing chamber, and which allows easy access to the circuit breaker arc extinguishing chamber. <P>SOLUTION: A line-side current transformer is horizontally disposed in a horizontal branch portion for connecting the circuit breaker unit and the line-side equipment unit. A manhole is provided in the case of the circuit breaker unit above the line-side current transformer, at the height in proximity to the arc extinguishing chamber, and in the direction of circuit axis (the direction of the horizontal branch portion). <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

The present invention relates to a gas insulated switchgear constituted by a busbar side unit, a circuit breaker unit, and a line side device unit, and in particular, a circuit breaker unit vertically installed.

In general, one-line equipment of gas-insulated switchgear is roughly divided into a bus-side equipment unit, a circuit breaker unit, and a line-side equipment unit, and stored in a container filled with an insulating gas. Recently, the arrangement order of each unit housed in the minimum number of containers is composed of a bus-side device unit, a circuit breaker unit, and a line-side device unit, thereby further reducing the size and rationalizing the gas insulated switchgear. Often placed in. In the circuit breaker unit disposed in the center, a circuit breaker and a current transformer disposed on one or both sides of the circuit breaker are housed in a circuit breaker container. For example, in Patent Document 1, one of the current transformers arranged on both sides is such that the bus-side current transformer is arranged on the line-side device unit side above the circuit breaker, and the other is the line-side current transformer. Is shown in the horizontal branch of the circuit breaker container. Moreover, the example which has arrange | positioned the current transformer on the one side of the circuit breaker in the circuit breaker unit is shown by patent documents 2 and 3.
JP 2004-266969 A Japanese Patent Laid-Open No. 3-98220 Japanese Patent Laid-Open No. 3-98221

In the configuration of the gas-insulated switchgear described in Patent Document 1 described above, a circuit breaker unit having a current transformer arranged in the center has a current transformer at the top of the circuit breaker. When exchanging room parts such as arc contacts and nozzles, it is necessary to remove the current transformer or provide an inspection manhole on the side of the circuit breaker vessel adjacent to the circuit. The solution was sought after.

On the other hand, in the configuration of the gas insulated switchgear shown in Patent Document 2 and Patent Document 3, an inspection manhole is provided in the circuit breaker part. In this example, the current transformer is installed only on one side of the circuit breaker. It is. Therefore, high reliability is required for system operation such as ultra-high voltage systems, and when installing current transformers on both sides of the circuit breaker, it is necessary to review the configuration of the circuit breaker unit, and if a manhole is provided in the circuit breaker part Therefore, there are problems such as being in a high position and inconvenient for inspection, and the circuit breaker unit as a whole becomes large and economically disadvantageous.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems, and by arranging a manhole in the upper part of the line-side current transformer of the circuit breaker vessel in the direction of the line axis, the circuit breaker is not increased without increasing the line-to-line dimension. An object of the present invention is to provide a gas insulated switchgear that is easily accessible to an arc extinguishing chamber and is compact.

The present invention has been made to solve the above-mentioned problems, and is configured and connected in the order of a bus-side device unit, a circuit breaker unit, and a track-side device unit. In the gas-insulated switchgear constituted by arranging a current transformer, a line-side current transformer is horizontally arranged at a horizontal branch portion connecting the circuit breaker unit and the line-side equipment unit, and the line-side current transformer A manhole is provided in the container of the circuit breaker unit in the upper direction of the device and in the vicinity of the arc extinguishing chamber in the line axis direction (horizontal branch portion direction).

According to the present invention, the line-side current transformer is housed in the connection horizontal branch portion between the circuit breaker unit and the line-side device unit, and the height of the breaker unit near the breaker arc-extinguishing chamber is high above the branch horizontal container. In addition, since a manhole for shut-off inspection is provided in the direction of the line axis (horizontal branch), the entire gas-insulated switchgear is kept compact and without removing the current transformer above the breaker. The circuit breaker can be inspected and maintainability can be improved.

  Embodiments of a gas insulated switchgear according to the present invention will be described below with reference to the drawings.

First, Example 1 is demonstrated using FIG. 1 and FIG. Figure 1 shows a typical gas insulated switchgear.
FIG. 2 is a structural diagram of the first embodiment based on the single-line diagram of FIG. In the first embodiment, one line includes a bus side device unit 1, a circuit breaker unit 2, and a line side device unit 3 from the left. A line-side current transformer 7 is accommodated in a horizontal branch portion 6 of a circuit breaker container 5 arranged below the circuit breaker 4 having an arc extinguishing chamber not shown in detail. A fixed support plate 8 a is attached to a protrusion 9 a provided on the inner wall of the horizontal branching portion 6.
A current transformer primary conductor 10 a is disposed at substantially the center of the line-side current transformer 7, and one end thereof is connected to the circuit breaker 4. On the other hand, the horizontal branch portion 12 of the line side device container 11 of the line side device unit 3 is connected to the other end of the current transformer primary conductor 10a. The line-side device unit 3 is connected to a line-side disconnector 13 and a line-side grounding device 14 provided on the main body of the line-side device container 11, with a power cable 15 on the lower side and an instrumental transformer on the upper side. A vessel 16 is arranged. Although not shown, in the case of bushing connection, it is also possible to arrange a bushing connection device at the terminal of the instrument transformer 16 instead of the power cable 15. Here, the line-side current transformer 7 is housed in the horizontal branch portion 6 of the circuit breaker container 5, but it can also be housed in a dedicated container of the line-side current transformer 7 although not shown.

On the other hand, a busbar side current transformer 17 is arranged on the upper part of the circuit breaker 4, and a support plate 8 b fixing the busbar side current transformer 17 is attached to a protrusion 9 b provided on the inner wall of the circuit breaker container 5. . A horizontal conductor 18 is insulated and supported by a post spacer 19 attached to a support plate 8b. A current transformer primary conductor 10b of a bus-side current transformer 17 is connected to a slide contact 20 at one end thereof for connection to the circuit breaker 4. It is electrically connected via. In the figure, the slide contact 20 is a current transformer primary conductor 10.
Although it is provided at both ends of b, it can be configured at least at one location. A lid 21 is provided at the upper opening of the circuit breaker container 5. In order to inspect and replace arc-extinguishing chamber parts of the circuit breaker 4, for example, arc contacts and nozzles (not shown), at a height near the arc-extinguishing chamber 4,
Manholes 22 are arranged almost in the line axis direction. The height of the manhole 22 depends on the arc-extinguishing chamber height of the circuit breaker 4.

On the other hand, the other end of the horizontal conductor 18 has a bus connecting conductor 2 connected to the two bus side device units 1.
3 is connected. In the two busbar device units 1, the main cylinders of the busbar containers 24 a and 24 b are arranged in the front and back direction of the paper surface. It is stored.

A maintenance inspection passage 28 is secured in front of the bus side device unit 1 as a device operation space for the line control panel 27 and the bus side device unit 1.

In order to inspect and replace the arc extinguishing chamber parts of the circuit breaker 4, an inspection floor 29 is installed above the track-side current transformer 7.

Although FIG. 2 represents a single-phase device, application to a three-phase device is also possible. In addition, although expressed by two busbar side device units, application to one is also possible.

According to the present embodiment, the lid 21 is removed, and then the horizontal conductor 18 and the primary conductor 10b of the bus-side current transformer 17 can be removed, so that it can be physically separated from the circuit breaker 4, so that it is substantially in the line axis direction. The arc-extinguishing chamber parts of the circuit breaker 4 can be inspected and replaced from the manhole 22 located in
Since troublesome removal work of the bus-side current transformer 17 and the secondary lead wire of the current transformer (not shown) is eliminated, the maintenance and inspection performance of the circuit breaker 4 can be improved. The upper space of the line-side current transformer 7 can be effectively used for maintenance and inspection work of the circuit breaker 4. Since there is no manhole in the direction between the lines, the dimension between the lines can be minimized, and the gas insulated switchgear constituted by a plurality of lines can be greatly reduced.

FIG. 3 shows an arrow AA in FIG. In the second embodiment, as shown in FIG. 3, the manhole 22 is disposed at an angle θ with respect to the line axis. Accordingly, even when a sufficient maintenance space cannot be obtained in the line axis direction, the manhole position is shifted by an angle θ with respect to the line axis direction, so that the maintenance space can be secured easily.

Next, Embodiment 3 of the gas insulated switchgear according to the present invention will be described with reference to FIG. In addition, the same code | symbol is attached | subjected to the structure same as Example 1, and the overlapping description is abbreviate | omitted.

In FIG. 4, the line-side current transformer 7 is housed in the horizontal branch portion 12 of the line-side device container 11, and the height H1 of the horizontal branch portion 12 is lower than the height H2 of the horizontal branch portion 6 of the circuit breaker container 5. is doing.
Since the horizontal branch portion 6 does not accommodate the line-side current transformer 7, the diameter thereof can be reduced, and the height H2 of the horizontal branch portion 6 can be reduced in calculating the strength of the container. For this reason, the height of the outer periphery of the container of the horizontal branch portion of the line side device can be arranged at a position about the height of the outer periphery of the container of the circuit breaker unit horizontal branch portion, and the height of the manhole 22 can also be reduced. Therefore, the breaker unit height H3
The overall size can be reduced.

According to this embodiment, the arc-extinguishing chamber height can be sufficiently reduced by the recent progress of arc-extinguishing technology for circuit breakers.

Typical single line connection diagram of gas-insulated switchgear according to first embodiment of the present invention The block diagram showing the internal structure of the gas insulated switchgear of the 1st Embodiment of this invention Sectional drawing showing arrow AA of the 2nd Embodiment of this invention The block diagram showing the internal structure of the gas insulated switchgear of the 3rd Embodiment of this invention

Explanation of symbols

1… Bus side device unit
2. Circuit breaker unit
3 ... Line side equipment unit
4 ... circuit breaker
5 ... Breaker container
6… Horizontal branch of breaker container
7… Line side current transformer
8a, 8b ... support plate
9a, 9b ... Protrusions
11 ... Rail side equipment container
12… Horizontal branch of the track side equipment container

13 ... Line side disconnector
14 ... Line side grounding device
15 ... Power cable
16 ... Instrument transformer
17 ... Bus side current transformer
18… Horizontal conductor
19… Post spacer
20 ... Slide contact
25a, 25b ... Bus
27 ... Line control panel
28 ... Maintenance inspection passage
H1… Horizontal branch height of track side equipment container
H2: Horizontal branch height of the breaker container

Claims (5)

A gas-insulated switchgear comprising a bus-side device unit, a circuit breaker unit, and a track-side device unit in the order of connection, and the circuit breaker unit having a bus-side current transformer disposed above the circuit breaker arc extinguishing chamber. A line-side current transformer disposed horizontally in a horizontal branch connecting the circuit breaker unit and the line-side device unit, and a container of the circuit breaker unit in an upward direction of the line-side current transformer and the power consumption. A gas insulated switchgear comprising: a manhole provided in a line axis direction at a height near the arc chamber. 2. The gas insulated switchgear according to claim 1, wherein the manhole is installed at a position above the line-side current transformer and at a height near the arc-extinguishing chamber from a vertical central axis of the circuit breaker unit container. A gas insulated switchgear characterized in that a line toward the center of the line and a line in the line axis direction have a predetermined angle. The gas-insulated switchgear according to claim 1 or 2, wherein an inspection floor is provided with the upper part of the line-side current transformer as a maintenance / inspection passage. 4. The gas insulated switchgear according to claim 1, wherein the line-side current transformer is housed in a horizontal branch portion of the line-side device unit, and a horizontal branch height of the line-side device unit is set to a horizontal branch of the circuit breaker unit. A gas insulated switchgear characterized by being lower than the height. 5. The gas insulated switchgear according to claim 1, wherein the gas insulated switchgear is applied to a three-phase device.

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