JP3056025B2 - Gas insulated combined switchgear - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas-insulated combined switchgear used in a substation system, a switchgear or the like of a double bus system.

[0002]

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

In FIG. 3, a circuit breaker 11 is a gas-insulated circuit breaker arranged so that the axial direction of the opening and closing operation is horizontal. Of the overhead wires connected to both ends of the circuit breaker 11, the overhead wire on one side is branched into two, each of which is connected to two main buses 1 via disconnectors 12a and 12b on the bus side.
3a and 13b. The overhead electric wire connected to the opposite side of the circuit breaker 11 is connected to the overhead transmission line 13c of the air insulation type via the disconnector 12c for the transmission line 13c and the grounding switch 14. The overhead power line connecting the grounding switch 14 and the overhead power transmission line 13c branches to form a lightning arrester 1
5. Connected to the instrument transformer 16.

[0004]

However, in the configuration of this conventional air insulation device, the disconnectors 12a, 1
2b, 12c and the contact parts of the earthing switch 14 are exposed to the air, so that they are easily affected by the external environment such as the air atmosphere and the installation environment, and the inspection cycle is short.
Complicated work such as switching and stopping of 3a and 13b is required, which is a negative factor from the viewpoint of stable power supply. In addition, there is a disadvantage that maintenance is inconvenient because the installation area of the equipment is widened in order to secure the insulation distance in the air, and the arrangement of the components such as the operation device is wide.

In order to overcome this drawback, there is a case where the main bus and the transmission line are arranged in a three-phase package in a container filled with an insulating gas. In such a case, high precision is required when connecting the lines. Connection adjustment is required, the construction period is long,
There were drawbacks that it was not easy to increase the number of lines and replace equipment, and that the tank was large and that the internal pressure of the tank increased during a three-phase short circuit. Therefore, the present invention provides a gas-insulated composite switchgear that reduces the number of times the main bus is stopped, simplifies maintenance and inspection,
It is intended to reduce the installation area, shorten the construction period, and facilitate the addition of lines.

[0006]

According to the present invention, a movable-side electrode portion and a fixed-side electrode portion which open and close in the axial direction of the tank are provided in a horizontally arranged circuit breaker tank filled with an insulating gas. The blocking unit provided is housed and arranged for each phase, and is derived from one of the movable side and the fixed side electrode unit,
Disconnects for two buses arranged so that the axial direction of the opening and closing operation is horizontal to a conductor that is derived from one of the two outlets at the upper part of the tank of the circuit breaker and branches into two. And a bushing having a terminal portion at its tip for connecting to two main buses of the air-insulated system are connected in series. Also, connected to the other electrode portion of the blocking portion, a conductor that is led out from a different lead-out portion from the lead-out portion, a disconnector for a line that is arranged so that the axial direction of the opening and closing operation is horizontal, A grounding switch, a lightning arrester, an instrument transformer, and a bushing with a terminal at the end for connecting to an aerial insulated overhead transmission line are connected in parallel to conductors branched in four directions from the disconnector. I do.

[0007]

In the gas-insulated composite switchgear of 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 atmosphere and installation environment can be improved. The number of parts affected by the external environment, such as the number of parts, has been greatly reduced, and the number of parts has been greatly reduced due to the simplification of the structure. The number of complicated operations such as switching, stopping, etc. can be reduced. Also,
The installation area of the equipment can be reduced by gasification, and the arrangement of the components such as the operation device can be relatively centralized, so that the maintenance becomes easy.

[0008] Since a bushing having a terminal portion at the leading end of the main bus and the lead-in portion of the transmission line is used, power can be directly received from the main bus using a conventional overhead line and the transmission line. The period is shortened, and it becomes easy to add lines. Further, according to the present invention, since the circuit breaker is arranged so that the axial direction of the switching operation is horizontal, the height and the center of gravity of the entire device are reduced, and the earthquake resistance and environmental harmony can be improved. Because of the phase separation type, equipment replacement can be performed for each phase, and the problem of large tanks and the rise in tank internal pressure at the time of three-phase short circuit can be solved.

Further, the circuit breaker is common to a single tank-type gas circuit breaker in terms of driving energy, opening and closing characteristics, and that two outlets are disposed above the tank. Can be shared.

[0010]

FIG. 1 shows an example of a gas-insulated composite switchgear according to the present invention. In this embodiment, the circuit breaker 21 is arranged so that the axial direction of the opening and closing operation is horizontal.
1, two conductors 27a connected to both ends of the interrupting portion 21a,
It is housed in the tank of the circuit breaker 21 together with 27b.

One of the conductors 27a is led out from an outlet 28a at the upper part of the tank of the circuit breaker 21, and is electrically connected in parallel with disconnectors 22a and 22b arranged so that the axial direction of the opening / closing operation is horizontal. On the other hand, the disconnectors 22a and 22b
Bushing 3 having terminal portions 29a and 29b at its tip
0a and 30b are connected to two main buses of the air insulation system. Further, a conductor 27b connected to the other electrode of the breaking part 21a and led out from the outlet part 28b of the tank part of the circuit breaker 21 includes a disconnector 22c arranged so that the axial direction of the opening and closing operation is horizontal. The terminal portion 29c is connected to an aerial transmission line of the air insulation type via a bushing 30c provided at the end thereof.

The conductor 31 connecting the bushing 30c and the line disconnector 22c branches off in the middle in three directions.
Each of them is connected to a grounding switch 24, a lightning arrester 25, and an instrument transformer 26.

[0013]

As described above, according to the present invention, the components such as the disconnector and the earthing switch are housed and arranged in the tank together with the insulating gas. The number of parts to be received is greatly reduced, and the reliability is greatly improved due to the reduction in the number of parts due to the simplification of the structure, and the maintenance and inspection cycle can be lengthened. Therefore, the number of complicated operations such as switching and stopping of the main bus can be reduced, which contributes to stable power supply. Further, the installation area of the equipment can be reduced by gasification, and the arrangement of the components such as the operation device can be relatively centralized, so that the maintenance becomes easy.

In the gas-insulated composite switchgear of the present invention, since the bushing is used for the main bus and the lead-in portion of the transmission line, it is necessary to directly connect the main bus using the conventional overhead line and the transmission line. And the construction period is shortened, and it is easy to add lines. Further, according to the present invention, the circuit breaker, and the disconnectors for the bus and the track are arranged so that the axial directions of the opening and closing operations are respectively horizontal, so that the height of the entire device and the center of gravity are reduced, and the seismic resistance is reduced.調和 Environmental harmony can be improved, and since each phase is separated, equipment can be exchanged for each phase, and the problem of larger tanks and increased internal pressure of tanks during three-phase short circuit can be solved.

Particularly, in the case of a circuit breaker, a tank-type gas circuit breaker is used in common with a single tank-type gas circuit breaker in that drive energy, opening / closing operation, and two outlets are disposed above the tank. Parts can be shared.

[Brief description of the drawings]

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

FIG. 2 is a single-line diagram for one general double-bus system.

FIG. 3 is a diagram showing a conventional example of a configuration using an aerial insulation device corresponding to the single-line diagram in FIG. 2;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 21 Breaker 21a Breaking part 22a, 22b, 22c Disconnector 24 Earthing switch 25 Surge arrester 26 Instrument transformer 27, 27a, 27b Conductor 28a, 28b Exit part 29a, 29b, 29c Terminal part 30a, 30b, 30c Bushing 31 Conductor

────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Tomoji Yamapo 3-1-1, Yoshino-cho, Nishibiwajima-cho, Nishi-Kasugai-gun, Aichi Prefecture Inside the Nagoya Office of Takatake Seisakusho Co., Ltd. 3-1-1, Machi, Takatake Works, Inc. Nagoya Office Inspector Yasutomo Fujimura (56) References JP-A-58-157305 (JP, A) JP-A-2-68607 (JP, U) JP-A-1 109210 (JP, U) Japanese Utility Model Sho 61-55410 (JP, U) Patent 2576739 (JP, B2) Japanese Patent Publication No. 52-40734 (JP, B1) (58) Fields investigated (Int. Cl. ⁷ , DB name) ) H02B 13/02-13/075 H02B 5/06

Claims (1)

(57) [Claims] 1. A circuit breaker having a movable-side electrode unit and a fixed-side electrode unit which are housed and arranged for each phase in a tank of a horizontally arranged circuit breaker filled with an insulating gas, and which open and close in an axial direction of the tank. A conductor that is connected to one of the electrode portions on the movable side and the fixed side and branches into two, and is derived from one of two outlet portions at the upper part of the tank of the circuit breaker and branched into two. A terminal portion for connecting to two main buses of the air insulation system is connected in series between two bushings provided at the ends thereof, so that the axial direction of the opening and closing operation is horizontal. The two bus disconnectors arranged, a conductor connected to the other electrode of the interrupting section and led out from a tapping section different from the tapping section, and an overhead transmission line of an air-insulated method Terminal between the terminal and the bushing provided at the end of the terminal. And a line disconnector arranged so that the axial direction of the opening and closing operation is horizontal, and a bushing and a line provided at a tip thereof with a terminal portion for connecting to the overhead transmission line of the air-insulated method. A phase-separated gas insulated composite switchgear, comprising: a grounding switch, a lightning arrester, and an instrument transformer, which are connected by branching from a conductor connecting the disconnector.