JPH0787636A - Gas insulated composite switchgear - Google Patents

Abstract

PURPOSE:To provide a gas insulated composite switchgear in which the number of times for interrupting the main bus is decreased, the maintenance and inspection are facilitated, the installation area is reduced, and the extension of line is facilitated. CONSTITUTION:A horizontally set interrupting section 21a is connected, at one electrode part thereof, with bushings 30a, 30b equipped with disconnectors 22a, 22b and terminal parts 29a, 29b to be connected with a double bus and connected, at the other electrode part, in series with a disconnector 22c and a bushing 30c equipped with a terminal part 29c. A ground switch 24, an arrester 25, and an instrument transformer 26 are connected in parallel between the disconnector 22c and the bushing 30c and enclosed, while separating the phases from each other, in a tank filled with insulating gas.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas-insulated composite switchgear for use in a double bus type substation, switchgear, etc.

[0002]

2. Description of the Related Art FIG. 4 shows a single line connection diagram for one line of a general double bus system, in which 1 is a circuit breaker, 2a is a disconnecting switch for a main bus 3a, 2b is a disconnecting switch for a main bus 3b, 2c. Is the transmission line 3c
Disconnecting switch, 4 is a grounding switch, 5 is a lightning arrester, and 6 is an instrument transformer. FIG. 5 shows a conventional example of a configuration of an air insulating device corresponding to the single line connection diagram shown in FIG.

In FIG. 5, a circuit breaker 11 is a gas-insulated circuit breaker in which only the circuit breaker is separately arranged for each phase and the axial direction of the opening / closing operation is horizontal. Of the overhead wires connected to both ends of this circuit breaker, one overhead wire is branched into two, and each of them is a disconnector 12 on the bus side.
It is connected to two main buses 13a and 13b via a and 12b. Further, the overhead electric wire connected to the opposite side of the circuit breaker 11 is connected to the aerial insulation type overhead power transmission line 13c via the disconnector 12c for the power transmission line 13c and the ground switch 14. The overhead wire that connects the ground switch 14 and the overhead power transmission line 13c is branched to a surge arrester 15 and an instrument transformer 1.
6 is connected.

[0004]

However, in the construction of this conventional air-insulated device, the disconnecting switches 12a, 12a, 1 are provided.
2b, 12c and the contact portion of the earthing switch 14 are exposed to the air, so that they are easily affected by the external environment such as the atmospheric atmosphere and the installation environment, and the inspection cycle is short.
Complex work such as switching and stopping 3a and 13b is required, which is a negative factor from the viewpoint of stable power supply. Further, in order to secure the insulation distance in the air, the installation area of the equipment becomes large, and the arrangement of the constituent equipment such as the operating device also covers a wide range, so that there is a drawback that maintenance is inconvenient.

In order to overcome this drawback, the main bus and the power transmission line may be arranged in a container filled with an insulating gas. In such a case, highly accurate connection adjustment is required when connecting the lines. However, there is a drawback that the construction period is long and it is not easy to add a line. Therefore, in the present invention, in the gas-insulated composite switchgear, the number of times the main busbar is stopped is reduced, facilitating maintenance and inspection, reducing the installation area and shortening the construction period, and facilitating the addition of lines. It is a thing.

[0006]

According to the present invention, a movable side electrode portion and a fixed side electrode portion which are opened and closed in the axial direction of the tank are provided in a tank of a circuit breaker which is filled with an insulating gas and arranged horizontally. The shut-off portion provided is housed in a three-phase package, and is led out from either the movable side or the fixed side electrode portion.
Two busbar disconnectors, which are arranged so that the axial direction of the opening / closing operation is horizontal to the conductors that are branched into two and lead out from the two outlets of the three outlets of the tank of the circuit breaker. And three bushings each having a terminal portion at the tip thereof for connecting to the two-phase three-phase main bus of the air insulation system are connected in series. In addition, a disconnector for a line, which is connected to the other electrode portion of the cutoff portion and is arranged on a conductor led out from a lead-out portion different from the two lead-out portions so that the axial direction of the opening / closing operation is horizontal. Connected to each of the conductors branched in four directions from this disconnector, a terminal part for connecting to a ground switch, a lightning arrester, an instrument transformer, and an air-insulated three-phase overhead transmission line is provided at the tip of the 3 Connect the book bushing in parallel.

[0007]

In the gas-insulated composite switchgear of the present invention constructed as described above, the components such as the disconnecting switch and the earthing switch are housed in the tank together with the insulating gas, so that the atmosphere and the installation environment can be improved. The number of parts that are affected by the external environment has been greatly reduced, and the number of parts has been reduced by simplifying the structure, greatly improving reliability and prolonging the maintenance inspection cycle. The number of complicated operations such as switching and stopping can be reduced. Also,
The installation area of the equipment can be made compact by gasification, and the arrangement of the constituent equipment such as the operating device can be relatively centralized, which facilitates maintenance.

Since the bushing having the terminal portion at the tip of the main busbar and the lead-in portion of the power transmission line is used, power can be directly received from the main busbar and the power transmission line using the conventional overhead wire. The period is shortened and it is easy to add lines. Further, according to the present invention, a circuit breaker and a bus bar,
Since the disconnectors for railroad tracks are arranged so that the axial direction of the opening and closing operations are horizontal, the height and center of gravity of the entire equipment can be lowered, and earthquake resistance and environmental friendliness can be improved, especially for circuit breakers. Since the driving energy, switching characteristics, etc. are common to the single tank type gas circuit breaker, the parts can be made common.

[0009]

1 is an example of a gas-insulated composite switchgear according to the present invention, and FIG. 2 and FIG. 3 show a side view and a top view of FIG. 1, respectively. In the present embodiment, the circuit breaker 21 is arranged so that the axial direction in which it opens and closes is horizontal, and in the tank of the circuit breaker 21 together with the two conductors 27 and 27c connected to both ends of the circuit breaker 21a. It is stored and placed in.

One of the conductors 27 is branched into two in the tank of the circuit breaker 21, and the branched conductors 27a and 27b.
Are disconnected from the lead-out portions 28a and 28b and are arranged so that the axial direction of the opening / closing operation is horizontal.
And six bushings 30a and 30b having terminal portions 29a and 29b at their ends, are connected to the two-phase three-phase main bus of the air insulation system, and the other electrode of the breaking portion 21a. The conductor 27c that is connected to the lead portion and is led out from the lead-out portion 28c is connected via a disconnector 22c arranged so that the axial direction of the opening / closing operation is horizontal, and three bushings 30c provided with terminal portions 29c at their tips. Connected to the three-phase overhead transmission line of the air insulation method.

A conductor 31 connecting the three bushings 30c and the line disconnector 22c is branched into three parts on the way, and each of them is connected to a grounding switch 24, a lightning arrester 25 and an instrument transformer 26. To be done.

[0012]

As described above, according to the present invention, the components such as the disconnecting switch and the grounding switch are housed and arranged in the tank together with the insulating gas, so that the influence of the external environment such as the atmospheric atmosphere and the installation environment can be prevented. The number of parts to be received is extremely small, and the reliability is greatly improved due to a reduction in the number of parts due to the simplification of the structure and the maintenance inspection cycle can be extended. Therefore, the number of complicated operations such as switching and stopping of the main bus can be reduced, which contributes to stable power supply. Moreover, the installation area of the equipment can be made compact by gasification, and the arrangement of the constituent equipment such as the operating device can be relatively centralized, which facilitates maintenance.

In the gas-insulated composite switchgear of the present invention, since the bushing is used for the main busbar and the lead-in portion of the power transmission line, it is necessary to directly connect the main busbar and the power transmission line using the conventional overhead wire. This reduces the construction period and makes it easier to add lines. Further, according to the present invention, since the circuit breaker and the disconnecting switch for the busbar and the disconnecting switch for the line are arranged such that the axial directions of the opening and closing operations are horizontal, the height of the entire device and the center of gravity are lowered, and the seismic resistance is reduced.・ Environmental harmony can be improved, and especially in the case of a circuit breaker, since the driving energy and switching characteristics are the same as those of a single gas circuit breaker, the parts can be shared.

[Brief description of drawings]

FIG. 1 is a diagram showing an example of a gas-insulated composite switchgear of the present invention.

FIG. 2 is a side view of FIG.

FIG. 3 is a top view of FIG.

FIG. 4 is a single line connection diagram for one line of a general double bus system.

FIG. 5 is a diagram showing a conventional example of a configuration of an air insulating device corresponding to the single line connection diagram of FIG.

[Explanation of symbols]

 21 Circuit breaker 21a Circuit breaker 22a, 22b, 22c Disconnector 24 Grounding switch 25 Lightning arrester 26 Instrument transformer 27, 27a, 27b, 27c Conductor 28a, 28b, 28c Lead-out part 29a, 29b, 29c Terminal part 30a, 30b, 30c bushing

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yuji Goto, 3-chome, Yoshino-cho, Nishibiwajima-cho, Nishikasugai-gun, Aichi Prefecture Takadake Works Nagoya Works (72) Inventor Tomoji Yamabashi, Nishibiwajima-cho, Nishikasugai-gun, Aichi Prefecture 3-chome, Takadake Co., Ltd., Nagoya Works (72) Inventor Tetsuhiko Yokoi 3-chome, Yoshino-cho, Nishibiwajima-cho, Nishikasugai-gun, Aichi Takadake Co., Ltd. Nagoya Works

Claims (1)

[Claims] 1. A movable-side electrode unit, which is housed in a three-phase package in a tank of a circuit breaker which is filled with an insulating gas and is horizontally arranged, and which is opened and closed in the axial direction of the tank, and a fixed-side electrode unit. A breaker, and a conductor that is connected to one of the movable-side and fixed-side electrode parts and branches into two, which is led out from two lead-out parts of the three lead-out parts of the tank of the circuit breaker. , The axial direction of the opening / closing operation is horizontal, which is connected in series between each of the three bushings provided at the tip of the terminal portion for connecting to the two-phase three-phase main bus of the air insulation method. 2 busbar disconnectors arranged in such a manner, a conductor connected to the other electrode portion of the interrupting portion and led out from a lead-out portion different from the two lead-out portions, and an air-insulating type 3 Three hooks equipped with terminal parts for connecting to overhead power lines are provided. A disconnector for a line, which is connected in series with the cable and is arranged so that the axial direction of the opening / closing operation is horizontal, and a terminal portion for connecting to the three-phase overhead transmission line of the air insulation method. A three-phase integrated gas-insulated switch with a grounding switch, a lightning arrester, and a transformer for transformer, which are branched and connected from a conductor that connects the three bushings at the tip to the disconnector for the line. apparatus.