JPH10201023A - Gas-insulated switchgear - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce spaces occupied by a circuit-breaker, an operating means, and a pair of earthing switches and to reduce the dimensions of a gas-insulated switchgear by providing the pair of earthing contacts between the circuit-breaker and the operating means. SOLUTION: The part of the upper charging unit 2a in a circuit-breaker 2 is fixed to a frame 16 by the medium of an insulating supporting cylinder 14, while the part of the lower charging unit 26 is fixed to the frame 16 by the medium of an insulating supporting insulator 15. And an operating means 3 fitted onto the right side of the frame 16 and the circuit-breaker 2 are interlocked/connected through an insulating rod 17 in the insulating supporting cylinder 14. And a pair of earthing switches 5 for grounding the upper and lower charging units 2a, 2b of the circuit-breaker 2 are arranged in a space inside the frame 16, surrounded by the circuit-breaker 2, the operating means 3, the insulating supporting cylinder 14, and the insulating supporting insulator 15. Consequently, it becomes possible to reduce spaces occupied by the circuit- breaker 2, the operating means 3, and a pair of earthing switches 5, and to reduce the dimensions of the gas-insulated switchgear.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas insulated switchgear, and more particularly, to an arrangement of a grounded switch for maintenance and inspection of a circuit breaker.

[0002]

2. Description of the Related Art In a circuit breaker applied to a gas insulated switchgear, a grounded switch is connected to both ends of the circuit breaker because all charged parts are hermetically sealed in an insulating gas. Conducts measurement of resistance and operation test of circuit breakers. Therefore, it is desirable to arrange the grounding switch as close to the circuit breaker as possible.

FIG. 8 is a side view showing a configuration around a circuit breaker of a conventional gas insulated switchgear. In the drawing, 1 is a circuit breaker mounting base, 2 is a circuit breaker operated by an operation mechanism 3, and charging portions 2a and 2b provided at both ends are insulating support cylinders 4.
Are insulated and supported by the circuit breaker mounting base 1 respectively. Reference numeral 5 denotes a pair of grounding switches connected to both charging units 2a and 2b of the circuit breaker 2, which are electrically connected to the fixing unit 5a insulated and fixed to the circuit breaker mounting base 1 and the charging units 2a and 2b, respectively. And a movable portion 5c that can be moved toward and away from the fixed portion 5a by operating the drive lever 5b.

In the gas insulated switchgear configured as described above, the disconnectors connected to both ends of the circuit breaker 2 are opened (not shown) to isolate the circuit breaker 2 from the power supply side and the load side. Thereafter, each of the grounding switches 5 is turned on to perform desired measurement, test, maintenance, and inspection.

[0005]

The periphery of the circuit breaker of the conventional gas insulated switchgear is constructed as described above, and each grounding switch 5 is connected in series in the longitudinal direction of the circuit breaker 2.
Longitudinal dimension, the dimension L ₁ of the circuit breaker 2, the sum of the dimension L ₂ of the two earthing switch 5 (L ₁ + 2L ₂₎ fraction only required, the greater the height of the entire gas insulated switchgear, There was a problem that it became large.

The present invention has been made to solve the above problems, and has as its object to provide a gas insulated switchgear that can be downsized.

[0007]

According to a first aspect of the present invention, there is provided a gas insulated switchgear having a circuit breaker having a charging portion at both ends and operating means interlocked with the circuit breaker. And a pair of grounding switches connected to each charging unit, wherein the pair of grounding switches is disposed between the circuit breaker and the operating means. The configuration of the gas insulated switchgear according to claim 2 is such that a pair of grounding blades that can be freely contacted and separated from each other is rotatably provided in each of the charging units, and a pair of grounding blades is rotated so that the pair of grounding blades rotate synchronously. The grounding switch is constituted by interlocking and connecting a single driving means to the grounding blade.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail based on an embodiment shown in the drawings.

The configuration of the gas-insulated switchgear according to the present invention is as follows:
As shown in FIG. In the figure, 6 is a bus, 7, 10 are disconnectors, 8,
9 and 11 are grounding switches, 2 is a circuit breaker, 12 is a lightning arrester, 1
3 is a cable head.

FIG. 2 shows details of the circuit breaker 2 in the gas insulated switchgear. As shown in the figure, the upper charged part 2a of the circuit breaker 2 is fixed to the frame 16 via the insulating support cylinder 14, while the lower charged part 2b is connected to the insulating support insulator 15
Is fixed to the frame body 16 via the. And the frame 16
The operation means 3 and the circuit breaker 2 attached to the right side of the above are interlockingly connected via an insulating rod 17 in the insulating support tube 14.

The upper and lower chargers 2a, 2a of the circuit breaker 2
A pair of grounding switches 5 for grounding b are provided inside the frame 16 and include the circuit breaker 2, the operating means 3, and the insulating support tube 14.
And an insulating support insulator 15. Hereinafter, the configuration of the pair of grounding switches 5 will be described in detail. 3 (a) and 4 (a) are views as viewed from an arrow A in FIG. 2 (a),
FIG. 3 is a view as viewed in the direction of arrow C in FIG.

As shown in FIG. 3, a pair of bearings 18 are provided inside the frame 16 so as to be separated from each other. And
Between a pair of bearings 18, a pair of mutually parallel insulating shafts 19,
20 is provided rotatably. The base end of the grounding blade 21a for three phases is fixed to the insulating shaft 19, and the through grounding terminal 23a for three phases grounded in advance and the grounding blade 21a for three phases are connected via the flexible conductor 22a. Have been. The ground blades 21 for these three phases
a is for grounding the upper charging section 2a. On the other hand, the base end portions of the grounding blades 21b for three phases are also fixed to the insulating shaft 20, and the through grounding terminals 2 for three phases are grounded in advance.
3b and three-phase ground blades 21b are connected via flexible conductors 22b, respectively. These three-phase grounding blades 21b ground the lower charging unit 2b. Insulated shafts 19 and 20 and ground blade 21
The connection with a and 21b is made via a pin 24 as shown in FIGS. 6 (a) and 6 (b).

In order to rotate these pair of insulating shafts 19 and 20 synchronously, the following configuration is adopted. FIG.
As shown in FIG.
0, a support shaft 25 is provided, and on the support shaft 25, an operation lever 26 is rotatably supported. On the other hand, insulated shaft 1
Follower levers 27 and 28 are fixed to 9 and 20, respectively, and driven levers 27 and 28 and operation lever 26 are connected to rods 29 and 30.
Are connected via A drive lever 31 is provided integrally with the operation lever 26, and the operation means 32 and the drive lever 31 attached to the outside of the frame 16
Are interlocked and connected via a rod 33 that penetrates airtightly.

Next, the operation of the gas insulated switchgear will be described. When the rod 33 protrudes from the driving means 32 as shown in FIGS.
21b come close to each other. At this time, since the grounding blades 21a and 21b do not contact the upper and lower charging units 2a and 2b, they are not grounded.

Next, when the rod 33 is pulled from this state,
The operation lever 26 rotates counterclockwise, and the driven lever 2
7, 28 rotate in mutually opposite directions. For this reason, as shown in FIGS. 2B and 4, the ground blades 21a and 21a
b rotate in a direction away from each other, and the upper and lower charging portions 2a, 2
b. As a result, a current flows from the upper charging unit 2a to the ground blade 21a to the flexible conductor 22a to the through ground terminal 23a. Also, the lower charging section 22b →
A current flows from the ground blade 21b → the flexible conductor 22b → the through ground terminal 23b.

As shown in FIG. 7, mutually parallel flat portions 19a are formed on both sides of the insulating shaft 19. Ground blade 2 while joining the ends
A contact piece 35 may be provided at the other end of 1a, and the flexible conductor 22a may be connected to the contact piece 35. By associating the width of the flat portion 19 a with the width of the ground blade 21 a, the falling of the ground blade 21 a with respect to the insulating shaft 19 is prevented. In addition, while the insulating shaft 19 is changed to a metal shaft in FIG. 7, the ground blade 21a may be formed of an FRP plate, and the spring property of the FRP plate may be used.

[0017]

As can be seen from the above description, according to the gas insulated switchgear according to the first and second aspects, a pair of grounding switches are arranged between the circuit breaker and the operating means. The space occupied by the means and the pair of grounding switches becomes smaller than before, and the gas insulated switchgear is downsized.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing the overall configuration of a gas insulated switchgear according to the present invention.

FIGS. 2A and 2B are diagrams showing a configuration of a gas-insulated switchgear according to the present invention in the vicinity of a circuit breaker, wherein FIG. 2A is a configuration diagram when a ground switch is open, FIG.

3 (a) is a view as viewed in the direction of arrow A in FIG. 2 (a), and FIG. 3 (b) is a view as viewed in the direction of arrow BB in FIG. 2 (a).

4A is a view as viewed in the direction of arrow C in FIG. 2B, and FIG. 4B is a view as viewed in the direction of arrow DD in FIG.

FIG. 5 is a view as seen from an arrow E in FIG. 2 (a).

6A and 6B are diagrams showing a structure of a main part of a gas-insulated switchgear according to the present invention, in which a grounding blade is attached.
(B) is an FF arrow view of (a).

7 (a) is a plan view, FIG. 7 (b) is a front view, and FIG. 7 (c) is a right side view according to another configuration of the ground blade in the gas insulated switchgear according to the present invention.

FIG. 8 is a configuration diagram showing the vicinity of a circuit breaker in a conventional gas insulated switchgear.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 2 ... Circuit breaker 2a, 2b ... Charge part 3 ... Operation means 5 ... Grounding switch 21a, 21b ... Grounding blade 32 ... Drive means

Claims (2)

[Claims] 1. A gas insulated switchgear comprising: a circuit breaker having charging parts at both ends; operating means operatively connected to the circuit breaker; and a pair of grounding switches connected to each charging part. A gas-insulated switchgear, wherein a pair of the grounding switches are arranged between the circuit breaker and the operating means. 2. A pair of grounding blades are provided on each of said charging portions so as to be rotatable, and a single drive means is provided on the pair of grounding blades so that the paired grounding blades rotate synchronously. A gas insulated switchgear, wherein the grounded switch is interlocked and connected.