JPS58179108A - Gas insulated switching device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention [Technical Field of the Invention] The present invention provides a busbar, a disconnector, a
The present invention relates to a gas insulated switchgear housing a circuit breaker and the like, and particularly relates to a gas insulated switchgear in which the structure of a busbar and a disconnector unit provided above the busbar is improved.

[Technical Background of the Invention] In substations or switchyards installed around large cities or coastal areas, it is difficult to obtain land or to prevent salt damage.
Gas-insulated switchgear is used in which electrical equipment constituting substations and switchyards is sealed with an insulating medium such as SF6 gas. This type of gas-insulated switchgear is constructed by arranging circuit breakers, disconnectors, and other necessary equipment three-dimensionally, narrowing the distance between each piece of equipment, and significantly reducing the site area. There is.

The general structure of such a gas insulated switchgear will be explained with reference to the layout diagram in FIG. 1 and the single line diagram in FIG. 2. That is, this gas insulated switchgear has two busbar units BU.
S1. Each bus unit BUSI is a three-phase integrated type that is used in a double bus type power transmission and substation equipment equipped with BUS2.

Each single-phase disconnector unit DS is installed on top of BUS2.
1. In addition to providing DS2, these disconnector units DS
1. The DS2s are connected by a telescopic bus EB, and the disconnector unit DS2 of one series is connected to the bus unit BU.
S1. It is connected to one sunrise part of the circuit breaker CB placed on the side of BUS2. A disconnector DS3 is connected to the sunrise part above the circuit breaker CB via a connection busbar,
Furthermore, a lightning arrester LA is connected to this disconnector DS3, and a grounding device ES is also connected via a current transformer CT. And, for this grounding device ES, air bushing BG
are connected, and these devices constitute a gas-insulated switchgear.

By the way, in such a gas insulated switchgear, the new circuit unit DS1. When the DS2 is opened, metal powder is generated due to the arc generated between the contacts, and dust is generated inside the unit due to wear of the operating mechanism. Furthermore, in the case of the double-bus type as shown in the figure, metal powder is suspended within the unit due to the opening and closing of the loop current. This type of metal powder and dust adheres to the inner surface of the container of the disconnector unit or to the insulating spacer, causing a reduction in the dielectric strength of that part. Therefore, recently, the disconnector unit and the busbar unit are communicated with each other without separating the gas with an insulating spacer to widen the space in which metal powder and dust can float, and the negative effects of metal powder are limited to the new circuit unit. A gas-insulated switchgear has been proposed that prevents concentration of gas.

An example of such a gas insulated switchgear will be explained with reference to FIGS. 3 and 4.

That is, in this conventional gas insulated switchgear, bus conductors 12 for three phases supported by insulating spacers 11 by -4- are provided in a case 1o of a bus unit. Fixed contact portions 13 are respectively provided to protrude upward at a predetermined interval. At the top of the case 10 of the busbar unit, cases 1 of each single-phase disconnector unit are arranged in accordance with the position of the fixed contact part 13.
4 is provided.

No insulating spacer serving as a partition is provided between the case 14 of the disconnector unit and the case 10 of the busbar unit, and the insides of the cases 10 and 14 of both cases are in communication with each other. In the case 14 of this disconnector unit, an external protruding electric line conductor 15 is arranged, and a movable contact part 16 extending in a direction perpendicular to the bus conductor 12 is inserted into the center of this external protruding electric line conductor 15. . This movable contact part 16 is supported so as to be able to move up and down with respect to the case 14 of the disconnector unit, and its tip end is connected to the fixed contact part 13.
The movable electrode 16a is in sliding contact with the movable electrode 16a. On the other hand, a movable rod 16b made of an insulating material is provided on the upper part of the movable contact portion 16, and the upper end of this movable rod 16b is connected to an opening/closing operation mechanism 17 provided on the upper part of the case 14 of the disconnector unit. has been done.

Further, the externally protruding electrical circuit conductor 15 is provided with an externally protruding electrical circuit terminal 15a that extends in a direction orthogonal to the movable contact portion 16. This external protruding electrical circuit terminal 15a is supported by an insulating spacer 18 provided on the side of the case 14 of the disconnector unit, and is a disconnector connected only to the telescopic bus EB as shown in FIG. In the unit DS1, this external protruding electrical circuit terminal 15a is formed only in one direction, and is provided in a disconnector unit [) 82 that is connected to both the telescopic bus EB and the circuit breaker CB as shown in FIG. In addition, the external protruding electrical circuit terminals 17a, 17a are provided in both right and left directions.

[Problems with the Background Art] As shown in FIG. 3 (A><B) and FIG. Metal powder generated due to contact wear, etc. is removed from the case 14 of the disconnector unit.
It is also diffused into the case 10 of the busbar unit 6-to, which has the advantage of preventing a decrease in dielectric strength due to metal powder.

However, in recent years, with the advent of ultra-high pressure class circuit breakers with one-point disconnection, circuit breakers have been significantly reduced in size. The dimensions between sunrises have been significantly reduced. As a result, the dimension L2 from the sunrise part to the upper end of the disconnector unit DS2, as shown in FIG. 4, connected to this type of fresh air must also be significantly reduced. The reason for this is that if the dimension L2 protruding from the upper part of the sunrise part of this disconnector unit DS2 is large, it will be impossible to connect the upper bus bar that connects horizontally to the upper branch sunrise part of the breaker CB. be. However, in the conventional gas-insulated switchgear in which the busbar unit and the case 10.14 of the disconnector unit are communicated with each other as shown in FIG. Moreover, since the movable contact part 16, which is moved up and down by the opening/closing operation mechanism 17, is housed in the disconnector case 14, the dimension L2 from the sunrise part -7= to the upper end of the disconnector unit is inevitably large. A circuit breaker C whose branch sunrise dimension L1 as described above is significantly reduced.
There was a drawback that connection to B was impossible.

[Object of the invention] The present invention improves the problems of the conventional gas insulated switchgear as described above, reduces the dimension from the branching part to the upper end of the new circuit unit as much as possible, and also reduces the amount of metal powder and It is an object of the present invention to provide a gas insulated switchgear which reliably prevents a decrease in dielectric strength due to floating of dust.

[Summary of the Invention] j The gas insulated switchgear of the present invention is provided with a movable contact portion and its opening/closing operation mechanism on the busbar unit side, and a fixed contact portion that makes sliding contact with the movable electrode of the movable contact portion is connected to a disconnector. By providing it on the unit side, the number of parts disposed inside and above the disconnector unit is reduced, and the dimension from the sunrise part to the upper end of the new circuit unit is reduced.

[Embodiments of the Invention] -8- Hereinafter, an embodiment of the present invention will be specifically described with reference to FIGS. 5 and 6.

In this embodiment, inside the case 20 of the busbar unit,
Bus conductors 21 for three phases are arranged in parallel and on the same horizontal plane. Connection conductors 22 are provided on these three-phase bus conductors 21 at predetermined intervals, and each connection conductor 2
2 extends to the upper part of the busbar container 20, and a busbar conductor side contact portion 23 is provided at the upper end thereof.

A movable contact portion 24 is located at the center of this bus conductor side contact portion 23.
is slidably inserted in a direction orthogonal to the bus conductor 21. The tip of this movable contact portion 24 is a movable electrode 24a that comes into contact with a fixed electrode on the new circuit unit side, which will be described later. On the other hand, the lower part of the movable contact portion 24 is connected to an opening/closing operation mechanism 25 provided at the bottom of the case of the busbar unit via a movable iron 24b that is an insulator. In this case, an insulating cylinder 2
6 is provided, thereby supporting the bus conductor side -9- contact portion 23. In addition, the movable rod 24b
intersects with the central bus conductor of the three-phase bus conductors 21, and a through hole 21b is provided at the intersection of the central bus conductors.
is bored, and the movable iron 24b is inserted into this ventilation hole 21b so as not to contact it.

On the other hand, on the top of the case 20 of the busbar unit, there are
A case 27 of a single-phase disconnector unit is provided in each case. The interiors of the case 27 of the disconnector unit and the case 20 of the busbar unit communicate with each other without providing an insulating spacer serving as a partition. A fixed electrode 28 is arranged inside the case 27 of this disconnector unit so as to face the bus conductor side contact portion 23 . This fixed electrode 28 is fixed to the cover plate 30 of the case 27 via an insulator 29 provided on its upper part by bolting or other means. The tip of the movable electrode 24a, which is slidably inserted into the bus conductor side contact portion 23, can come into and out of sliding contact with the fixed electrode 28.

Further, on the sides of the fixed electrode 28, for example, a pair of right and left externally protruding electric line terminals 31, 31 are provided, and these externally protruding electric line terminals 31 are connected to an insulating spacer provided in a side opening of the case 27. 32 and constitutes the sunrise part of the disconnector unit.

The gas insulated switchgear of this embodiment having such a configuration is as follows:
The opening/closing operation mechanism 25 provided on the case 20 side of the bus bar unit is activated, and the operation iron 24b connected thereto is moved up and down, and the movable electrode 24a at the tip is connected to the fixed electrode provided on the case 27 side of the disconnector unit. By bringing them into contact with or separating them from 28, opening/closing operations are performed between the bus conductor 21 and the external protruding circuit terminals 31 and 31 on the disconnector unit side.

In addition, the disconnector unit and busbar unit of this embodiment are
To connect to circuit breakers and other equipment, do as shown in Figure 6. In that case, the -11- device of this embodiment has a movable contact part 24 that moves up and down with respect to the fixed electrode 28.
is housed in the case 20 of the busbar unit, and also includes an opening/closing operation mechanism 2 for operating the movable contact portion 24.
5 is also provided at the lower part of the case 20 of the busbar unit, so the dimension L3 from the sunrise part to the upper end of the disconnector unit is extremely short compared to conventional disconnector units.

Therefore, it is possible to place other disconnectors or connection bus bars above the sunrise part of this disconnector unit, so the distance between the upper and lower sunrise parts as shown in Figure 6 can be shortened. It becomes possible to configure a gas-insulated switchgear using a circuit breaker.

Furthermore, in the illustrated embodiment, the three-phase bus conductors 21 inserted into the case 20 of the bus unit are arranged on the same horizontal plane, so that the bus conductors are inserted into the case 20 as in the conventional type shown in FIG.
Since the opening/closing operation mechanism 25 of the movable contact portion 24 is not disposed near the bottom of the case 2o, a space can be secured at the bottom of the case 2o. As a result, the amount of protrusion of the opening/closing operation mechanism 25 from the lower surface of the case 2o is reduced accordingly, and the dimension from the upper end of the disconnector unit to the lower end of the busbar unit can also be shortened.

Note that the present invention is not limited to the embodiment shown in FIG. 5. For example, if there is space below the busbar unit when it is installed, the busbar conductor 21 to be inserted into the busbar unit may be replaced with the conventional busbar conductor 21. Similarly, it is also possible to arrange them in a triangular shape. In addition, as shown in Fig. 7, the three-phase bus conductor 2
If 1 is placed avoiding the center of case 20, case 20
It is also possible to avoid crossover between the movable contact portion 24 disposed at the center of the bus conductor and the bus conductor.

[Effects of the Invention] As shown in the above embodiments, according to the present invention, the dimension from the sunrise part to the upper end of the new circuit switch unit is significantly shortened, so it is possible to downsize the disconnector unit. In addition, by using this disconnector unit, it is also possible to use a vertically installed circuit breaker with a shortened upper and lower sunrise radical length, which has the effect of reducing the size of the entire gas-insulated switchgear.

In addition, it is possible to incorporate the movable contact part and its opening/closing operation mechanism into the case of the busbar unit, which has a predetermined dimension of -13 to ensure insulation between the busbar conductors. There is also the advantage that the dimension from the upper end of the disconnector unit to the lower end of the busbar unit is also shortened.

Furthermore, the case of the new circuit switch unit and the case of the busbar unit are also in communication, and since the height of the case of the disconnector unit is low, the contact area between the fixed contact and the movable contact in the new circuit switch unit is The disconnector unit will also be placed near the busbar unit case, allowing metal powder generated inside the new circuit switch unit case to smoothly move to the wider busbar unit case side, thereby increasing the dielectric strength of the disconnector unit. There is no risk of it declining.

[Brief explanation of the drawings] Figure 1 is a layout diagram showing an example of a conventional gas-insulated switchgear;
Figure 2 is a single line diagram of the gas insulated switchgear in Figure 1,
Figures (A) and (B) are longitudinal and cross-sectional views of a busbar unit and a disconnector unit in a conventional gas-insulated switchgear.
The figure is a cross-sectional view showing another example of the busbar unit and disconnector unit of the conventional gas-insulated switchgear, and FIG. 5 is an embodiment of the busbar unit and disconnector unit of the gas-insulated switchgear of the present invention. 6 is a layout diagram showing an example of a gas insulated switchgear using the busbar unit and disconnector CONIT of FIG. 5, and FIG. 7 is a busbar unit used in the gas insulated switchgear of the present invention. FIG. 3 is a cross-sectional view showing another embodiment of the disconnector unit. DESCRIPTION OF SYMBOLS 10... Case of busbar unit, 11... Insulating spacer, 12... Busbar conductor, 13... Fixed contact part, 1
4... Case of disconnector unit, 15... External protruding electrical circuit terminal, 16... Movable contact portion, 16a... Movable contact, 16b... Operation rod, 17... Opening/closing operation mechanism, 20 ... Bus bar unit case, 21... Bus bar conductor, 22... Connection conductor, 23... Bus bar conductor side contact part, 24... Movable contact part, 24a... Movable contact, 24
b...Operation Rondo, 25...Opening/closing operation mechanism, 26.
... Insulation cylinder, 27 ... New circuit unit case, 28
... fixed contact, 29 ... insulator, 30 ... cover plate,
31... External protruding electrical circuit terminal, 32... Insulating spacer. -15- Figure 1 Figure 3 (A) (B) Figure 4 Figure 5 Figure 6

Claims (3)

[Claims] (1) A disconnector unit case filled with an insulating medium and a bus unit case are placed in communication with each other in a direction orthogonal to each other, and a bus conductor is placed inside the bus unit case, and a bus unit case is placed in a direction orthogonal to the bus conductor. arranging a moving movable contact part in accordance with the position of the disconnector unit case,
An opening/closing operation mechanism provided on the busbar unit case side is connected to this movable contact part, while an external protruding electrical circuit terminal is provided inside the disconnector unit case to be disposed at the sunrise part of the disconnector unit. A gas insulated switchgear, characterized in that the external protruding electrical circuit terminal is provided with a fixed contact facing the movable contact provided in the movable contact portion. (2) The gas-insulated switchgear-1- device according to claim 1, wherein the fixed contact is disposed near a joint between a disconnector unit case and a busbar unit case. (3) A plurality of the busbar conductors are arranged in the busbar unit case, and each of the plurality of busbar conductors is provided in parallel and on the same horizontal plane. gas insulated switchgear.