JPH01255409A - Gas insulated switchgear - Google Patents

Abstract

PURPOSE:To improve maintenability and safety of circuit breakers and to make them small-sized, by housing earth switches for the maintenance of breakers in the units on bus bar sides. CONSTITUTION:Moving pieces of disconnectors 14a and 14b of the 1st and 2nd bus bar sides are connected to three-phase main bus bars 13a and 13b provided horizontally at right angle to the axis of a circuit breaker container 6. The stators of disconnectors 14a and 14b on bus bar sides are connected to circuit breaker connecting terminal sections 17a and 17b on bus bar sides after they are passed through earth switches 30a and 30b for maintenance, of which stators are provided on the conductor in the extending direction of the stators for disconnectors 14a and 14b on bus bar sides. Moving pieces are arranged which move horizontally to the stators and come into contact with the abovementioned stators. After the breaker 6 is removed, the earth switches 30a and 30b for the maintenance of breakers are left in the units on bus bar sides and the disconnectors 14a and 14b become earthed, so that there will be no danger of electric shock at work.

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) The present invention relates to a gas insulated switchgear comprising two main lines connected to one circuit breaker, In particular, the arrangement of the equipment that makes up the gas-insulated switchgear has been improved.

(Prior art) A gas-insulated switchgear houses a circuit breaker, a disconnecting part of a disconnecting switch, and a disconnecting switch in a container filled with SFa gas, etc., which has excellent insulation and arc-extinguishing properties, and also houses a busbar. It is composed of a combination of equipment such as. This type of switchgear can be configured to be significantly smaller than an air-insulated switchgear. In recent years, due to the remarkable rise in land prices, gas-insulated switchgears, which can be made smaller, have been increasingly used in substations.

Furthermore, by rationally arranging the component equipment, the size of the -layer can be reduced, making it possible to reduce the cost of gas-insulated switchgear and further reduce the cost of constructing substations, including buildings for indoor gas-insulated switchgear.・Miniaturization is possible.

Here, a conventional double-bus type circuit insulated switchgear will be explained using FIG. 7. This figure is a side view of a gas-insulated switchgear in which the feeder line connecting the double-configured bus bar to the power cable line is formed using a conventional equipment configuration. Indicated.

In FIG. 7, the interrupting section 5, which is the electrode section of the circuit breaker 1, is
It is housed in a circuit breaker container 6 arranged in a vertical direction,
A circuit breaker configuration box 7 installed below the circuit breaker container 6
It is driven by an operating device (not shown) inside. Further, on the side surface of the circuit breaker container 6, there are first and second bus bar connection outlet terminal portions 8, 9 that protrude in the same direction and are arranged vertically in parallel.
and a line-side equipment connection outlet terminal part 10 protruding in the opposite direction to these busbar connection outlet terminal parts 8 and 9. Among these, the busbar connection outlet terminal section 8.9 is commonly connected to one terminal of the breaking section 5 by a branch conductor 11, and the line side equipment connection outlet terminal section 10 is connected to the connection conductor 1.
2 is connected to the other terminal of the interrupting section 5. Further, the branch conductor 11 is connected to a circuit breaker maintenance grounding switch 15 which is housed in the circuit breaker container 6 all at once.

Further, each busbar connection outlet terminal portion 8.9 of the circuit breaker container 6 has first main busbars 13a, 13b disposed horizontally, and busbars disposed at right angles to the main busbars 13a, 13b. The side disconnectors 14a and 14b are connected to each bus side unit container 16a.
, 16b are collectively housed in the bus bar side units 2 and 3, which are separated and connected by insulating spacers 18a and 18b, respectively. Each of the bus-side units 2.3 is a bus-side disconnector 14a in which electrodes are arranged perpendicular to the main busbars 13a, 13b and toward the circuit breaker 1.

One terminal of the circuit breaker 14b is connected, and circuit breaker connection terminal portions 17a and 17b are provided in the extending direction of the disconnector, and these circuit breaker connection terminal portions 17a and 17b are connected to the bus bar side unit of the circuit breaker 1 as described above. It is connected to the outlet terminal portion 8.9. On the other hand, the output terminal section 10 for connection of track side equipment of the circuit breaker container 6 includes a current transformer 24 which is connected in order from the circuit breaker side, a grounding switch 27 for circuit breaker maintenance, a track side disconnector 25, and a track side disconnector 25. A line-side unit 4 in which a grounding switch 28 and a cable head 26 are collectively housed in a line-side unit container 29 is connected to the line-side unit 4 in a gas-separated manner by an insulating spacer 23.

(Problem to be solved by the invention) In the conventional gas insulated switchgear configured as described above,
Since the grounding switch 15 for circuit breaker maintenance disposed on the busbar side is housed in the circuit breaker container 6, the circuit breaker 1
When the circuit breaker is removed for maintenance, the circuit breaker maintenance grounding switch 15 is also disconnected from the circuit at the same time. Therefore, when performing the work by opening the I-line side disconnectors 14a, 14b while keeping the main buses 13a, 13b live, the disconnector 14a.

A voltage was induced in the circuit breaker side terminal of 14b due to electrostatic induction, and there was a risk of electric shock during work. Furthermore, after removing the circuit breaker, the circuit breaker side terminals of these disconnectors 14a, 14b had to be grounded again by another method.

Furthermore, in the conventional gas-insulated switchgear, the branch conductor 11 and the grounding switch 15 for bus-side circuit breaker maintenance are housed in separate containers, and one bus-bar connection outlet formed on the side surface of the circuit breaker container 6 is used. This is configured by inserting and connecting between the terminal section 8.9 and the bus bar side unit 1.2. In this case, the above-mentioned problem does not occur, but the device becomes complicated and gas-insulated switching is required. There was a drawback that the longitudinal dimension of the side of the device became long.

It is an object of the present invention to solve the problems of the conventional gas insulated switchgear as described above, to improve the maintenance workability of the circuit breaker and the safety during work, and to provide a gas insulated switchgear which is small in size and has a simple configuration. The purpose of the present invention is to provide an insulated switchgear.

[Configuration 1 of the Invention (Means for Solving the Problems) The gas insulated switchgear of the present invention has the following features: the circuit breaker side terminal of the second busbar side disconnector; and the second circuit breaker outlet terminal section, respectively. By arranging the second earthing switch, the earthing switch is housed within the first and second busbar side units, and furthermore, the first. The rotary drive shaft of the second earthing switch is connected to one operating device via a set of connecting links.

(Function) In the present invention having the above-described configuration, first. Since a grounding switch is installed in the second bus-side unit, even if the breaker is removed, the grounding switch that grounds the breaker-side terminal of the bus-side disconnector remains, thereby preventing electric shock during one operation. The danger is eliminated, and extra work such as re-grounding the circuit breaker side terminal of the circuit breaker by another method after removing the circuit breaker is unnecessary. In addition, the device is configured with the minimum number of containers necessary,
The longitudinal dimension of the side surface of the device can be reduced.

(Example) Next, an example of the gas insulated switchgear of the present invention will be described with reference to FIG.

Note that the same parts as those in the prior art are given the same reference numerals and the description thereof will be omitted.

Configuration of this embodiment* Fig. 1 is a partially cutaway side sectional view of a three-phase tank-type gas insulated switchgear in which the cable lead-in line of the same double-bus type as the conventional type shown in Fig. 7 is constructed according to the present invention. , FIG. 2 is a single line diagram of this circuit. In FIG. 1, 1. The first. The installation means for the second three-phase main bus bar etc. has a well-known configuration, and the three-phase main bus bar 13a is provided in the horizontal direction perpendicular to the axis of the circuit breaker container 6.
.

13b, the first. The movers of the second busbar side disconnectors 14a, 14b are connected, while the first... If the stator of the second ffl line side disconnectors 14a, 14b has a conventional configuration, the stator of the second ffl line side disconnector 14a, 14b would be the first stator of the circuit breaker container 6. The branch conductor 1 is connected to the circuit breaker connection terminal portions 17a and 17b connected to the second busbar connection outlet terminal, and is connected to the branch conductor 1 through insulating spacers 18a and 1Bb.
However, in the gas insulated switchgear of the present invention, the first.
Second circuit breaker maintenance grounding switch 30a, 30
b is provided. This first. Second circuit breaker maintenance grounding switch 30a.

30'b is the first. Second busbar side disconnector 14a.

A stator is provided on the conductor in the stator extension direction of 14b,
A movable element that moves horizontally and contacts the stator is disposed opposite to the movable element. Furthermore, a first
．． The second circuit breaker maintenance earthing switch rotary drive shaft 318.31b is arranged on the same axis in the vertical direction. The two moving shafts 31a, 31b are connected to the first. The second busbar units 2 and 3 are arranged to face each other in the direction between them, and furthermore, the moving shafts 31a and 31b of both parts are connected to an earthing switch operating device 33 via a set of connection links 32. This earthing switch operating device 33 is connected to the first and second main busbars 13a, 1
3b and the busbar side disconnector operating device 22a, 22
According to a command from this earthing switch operating device 33, the earthing switch 30a for breaker maintenance is disposed between the first and second circuit breaker maintenance earthing switches 30a.

30b are operated all at once. Further, a control panel 34 for the line is arranged at the bottom of the second bus-side unit 3.

Effects of this embodiment* According to the gas insulated switchgear of this embodiment, the circuit breaker 1 can be removed while keeping either or both of the first and second main busbars 13a, 13b in the live state. When inspecting, first check the first and second bus-side disconnectors 14a and 14b.
The first and second circuit breaker maintenance grounding switches 30a are opened.

30b, the circuit breaker 1 side terminals of the busbar side disconnectors 14a, 14b are grounded. After that, the first and second busbar connection outlet terminal portions 8.9 of the circuit breaker 1 and the insulating spacer 18a
, 18b, the circuit breaker 1 is removed. For track side equipment, open the circuit breaker 1 and track side disconnector 25 in advance, and close the grounding switch 27.
and 28 are grounded, and the track side unit 4 is disconnected by the track side equipment outlet terminal 10.

Effects of this embodiment* As described above, in the circuit breaker maintenance work of this embodiment, even after the circuit breaker is removed, the first and second circuit breaker maintenance earthing switches 30a and 30b are connected to the busbar side units 2 and 3. Since the circuit breaker 1 side terminals of the first and second busbar side circuit switches 14a and 14b are grounded, there is no risk of electric shock during work. Furthermore, first and second circuit breaker maintenance grounding switches 30a, 3
ob can be operated in common by - earthing switch operating devices 33, and the grounding work can be performed in exactly the same way as in the case of - earthing switches.

Further, the first and second circuit breaker main denance earthing switches 30a, 30b are housed together with other bus-side equipment in the first and second bus-side unit containers 16a, 16b, respectively. The configuration of the entire device can be simplified. Part 1
, only the interrupting part 5, branch conductor 11, and connecting conductor 12 of the circuit breaker are housed in the circuit breaker container 6, compared to the case where the circuit breaker main maintenance grounding switches 30a and 30b are also housed at the same time. , the circuit breaker container 6 is downsized.

Further, one earthing switch operating device 33 of the first and second circuit breaker maintenance grounding switches 30a, 30b is disposed between the first and second bus-side disconnecting switch operating devices 22a, 22b. Furthermore, since the control panel 34 of the circuit is disposed at the lower part of the bus bar side unit, the longitudinal dimension of the side surface of the gas insulated switchgear can be reduced as a whole.

*Other Embodiments* The present invention is not limited to the above-mentioned embodiments, but may be structured as shown in FIGS. 3 to 6. 3 and 4, on the side surface of the circuit breaker container 6 of the circuit breaker 1, there are first holes protruding in the same direction and arranged vertically in parallel.
and second bus bar connection outlet terminal portions 35 and 36 are provided. This first and second ffl line connection outlet terminal part 35.3
6, both ends of the interrupting part 5 of the circuit breaker are led out by connecting conductors 37 and 38, respectively. Further, the first and second bus-side units 2.3, which are the same as those shown in FIGS. The first and second insulating spacers 18a and 18bS may be disposed and connected between the current transformers 39a and 39b and the circuit breaker container 6.

Even in the gas insulated switchgear configured as described above, when the circuit breaker 1 is removed and inspected while the main busbars 13a and 13b are in the live state, the circuit breaker 1 is removed from the first. It is only necessary to separate and remove the second insulating spacers 18a and 18b and the busbar connection outlet terminal parts 35 and 36 of the circuit breaker,
With regard to the safety and workability of maintenance work, the same effects as the gas insulated switchgear shown in FIGS. 1 and 2 can be achieved. Further, regarding the dimensions of the entire device, the side longitudinal dimension can be reduced as in the previous embodiment.

In addition, in the case shown in FIG. 5 and FIG. 6, one side of the divided bus of the double busbar is the first main busbar 13a, and the used side is the second main busbar 13b, and there is a connection between them. disconnectors 14a, 14b, i13 disconnector maintenance grounding switches 30a, 30b, current transformers 39a, 39b, circuit breakers]
is constructed in the same form as the insulated switchgear for the busbar connection line shown in FIGS. 3 and 4. Then, place the circuit breaker 1 on the stand 4.
0, and the entire unit is lifted and placed so that the position of the second main bus bar 13b matches the position of the upper main bus bar in the track lead-in line, bus bar connection line, etc. However, the earthing switch 30 for circuit breaker maintenance
The operating devices 33 a and 30b are arranged at the lower front surface of the second main bus bar 13b to facilitate operation. Further, between the second main bus bar 13b and the control panel 34, the other bus bar of the double bus bar is connected to the first bus bar. It may be arranged parallel to the second main generatrix 13a, 13b. Also in this configuration, the first. Figures 2 and 3. The same function and function as the gas insulated switchgear shown in Figure 4.
Effects can be obtained.

In the gas-insulated switchgear shown in FIGS. 3 to 6 above, current transformers 39a and 39b are provided at both ends of the circuit breaker 1, but the current transformer 39a is the same as the current transformer 39a.

39b may be formed only on one side.

At this time, the same configuration as above can be achieved by configuring the side without the current transformer with a connecting bus bar. or,
The bus line division circuits shown in FIGS. 5 and 6 are of a double bus system, but in the case of a single bus system, one side of the bus to be divided is the first main bus 13a, and the other side is the first main bus 13a. The second main bus line 13b can be constructed in the same manner as the bus line communication line of the double bus system shown in FIGS. 3 and 4. Furthermore, 2
Regarding the bushing lead-in line of the heavy bus type, the bus line side can be configured in exactly the same way by changing the line side unit 4 of the cable lead-in line shown in FIGS. 1 and 2. In all of the above configurations, the same functions and effects as the gas insulated switchgear shown in FIGS. 1 to 6 can be obtained in terms of safety, workability, and overall device dimensions during circuit breaker maintenance.

[Effects of the Invention] As described above, according to the present invention, by storing the circuit breaker maintainer 7 and the open PJI blade in the unit 1, it is possible to remove the circuit breaker for inspection. In addition, the grounding of the bus-side equipment requires only one operation of one operating device, and the breaker-side terminal of the bus-side disconnector is grounded during operation, and the equipment is installed in the minimum necessary container. is configured,
In addition, since the longitudinal dimension of the side surface is reduced, it is possible to provide a gas insulated switchgear that is small in size and has a simple configuration, which improves the workability of maintaining the circuit breaker and the safety during operation.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway side sectional view of a gas insulated switchgear for a double bus type cable lead-in line showing an embodiment of the present invention, FIG. 2 is a single line diagram of the gas insulated switchgear shown in FIG. 1, Fig. 3 is a partially cutaway side sectional view of a gas insulated switchgear for a double bus type busbar connection line showing another embodiment of the present invention, Fig. 4 is a single line diagram of the same as Fig. 3, and Fig. 5 is A side view of a gas insulated switchgear for a double bus line bus division line showing still another embodiment of the present invention, FIG. 6 is the same single line connection diagram as in FIG. 5, and FIG. 7 is a conventional double bus line cable It is a side view of the gas-insulated switchgear of a lead-in line. 1... Circuit breaker, 2, 3... 1st. 2nd busbar side unit, 4... Track side unit, 5... Breaking part, 6...
... Breaker container, 7... Breaker mechanism box, 8, 9...
``a Disconnector 1st and 2nd bus connection outlet terminal part, 10.
...Output terminal section for connecting equipment on the track side, 11... Branch conductor, 12... Connection conductor, 13a, 13b... 1st. 2nd main bus line, 14a, 14b... 1st. 2nd busbar side disconnector, 15... Earthing switch for circuit breaker maintenance, 16a, 16b... 1st. a second busbar side unit;
17a, 17b・! ! I disconnection connection terminal section, 18a, 18
b... 1st. Second insulating spacer, 22a, 22b.
...First. 2nd bus-side disconnector operator, 23... Insulating spacer, 24... Current transformer, 25... Line-side disconnector, 26... Cable head, 27... Ground for circuit breaker maintenance. Switch, 28... Earthing switch for track grounding, 29... Track side unit container, 30a, 30b.
...Earthing switch for first and second circuit breaker maintenance,
31a, 31b... 1st. The second grounding switch drive for circuit breaker maintenance! J! Axis, 32...Connection link, 3
3... Earthing switch operator, 34... Control panel, 35,
36...1st. Second bus bar connection outlet terminal part, 37° 38... Connection conductor, 39a, 39b... Current transformer, 4
0... mount. Figure 2 4b 3rd Agony name 43 13b+4Q 1 unit 0 4b30b Figure 5 6-

Claims (1)

[Scope of Claims] A first bus-side unit including a first main bus and a first bus-side disconnector; and a second bus-side unit including a second main bus and a second bus-side disconnector. A second bus bar side unit consisting of a second bus bar side unit is connected in parallel to the first and second outlet terminal portions of the circuit breaker which are arranged in parallel in the same direction perpendicular to the axis of the circuit breaker, respectively, with gas separated. In the gas-insulated switchgear, a first,
A second earthing switch is disposed, and a rotary drive shaft for driving each of the first and second earthing switches is connected between the first and second busbar side units so that the axis of the circuit breaker A gas insulated switchgear characterized in that the rotary drive shafts are arranged facing each other on the same axis parallel to the above and connected to a single operating device via a set of connecting links.