JPH03103014A - Gas insulated switchgear - Google Patents

Abstract

PURPOSE:To improve the reliability of gas leak-proof performance by securing the intermediate section of a lever having one end interlocked with one ground unit and the other end interlocked with another ground unit to a rotary shaft and penetrating a tank with the rotary shaft which is then interlocked with a drive source. CONSTITUTION:A ground unit 7a is arranged at upper left section in a circuit breaker tank 14 where three phases of power source buses 41 and load buses 42 approach each other, and ground units 7a, 7b are arranged proximate thereto. A rotary shaft 21 is arranged in the tank 14 and the intermediate section of a lever 43 is secured to the rotary shaft 21. One end of the lever 43 is interlocked with one ground unit 7a while the other end thereof is interlocked with the other ground unit 7b and the tank 14 is penetrated with the end section of the rotary shaft 21 which is then interlocked with a drive source located on the outside of the tank.

Description

[Detailed Description of the Invention] A. INDUSTRIAL APPLICATION FIELD The present invention relates to a gas-insulated switchgear with an improved operating mechanism for operating a grounding device.

B. Summary of the Invention The present invention provides a gas insulated switchgear in which a tank filled with an insulating gas is provided with one grounding device and another grounding device, and a driving source is provided in the outer part of the tank. The intermediate part of the lever, which is interlockingly connected to one end and another grounding device is interlockingly connected to the other end, is fixed to the rotating shaft, and the end of the rotating shaft is passed through the tank and interlockingly connected to the drive source. This design allows the gas to penetrate the tank at only one location, reducing the number of sealing materials required, lowering costs, and improving reliability against gas leaks.

C. 2. Description of the Related Art First, the connection state of a gas insulated switchgear unit (hereinafter simply referred to as a unit) will be explained with reference to FIG. Although the figure shows the connection per single wire, each unit is provided with three phases. There are also two main buses la and lb, one of which is the main line and the other is an auxiliary line used for emergency use in the event of a power outage or the like. In the figure, 2 is a breaker, 3 is a current transformer, 4 is a cable head for connecting to a load, 5 is a lightning arrester, 6 is an instrument transformer, 7a to 7c are grounding devices, 8
A to 8d are Shinroki.

Next, a gas insulated switchgear (hereinafter simply referred to as the device) consisting of a unit with such wiring connections is shown in FIGS. 6(a) to (c).
The explanation will be based on. As shown in the figure, the device is constructed by connecting a plurality of units lOa, 10b, . . . in one direction.

Each unit has the same structure, for example, unit 10
a is as shown in FIG. 6(b). As shown in the figure, a breaker block 12a, a main bus block 12b, and a line side block +2c are formed on the base If. The cutoff block 12a has a frame l3 on the base 11 and a frame l3
Consists of upper cutoff tank 14, etc., and track side block 12
C consists of a cable support frame l5 on the base 11, a cable tank 16, etc. The main busbar block 12b has conduits 17a, 17b extending in a direction perpendicular to the plane of the drawing, and a conduit 17a.
, 17b at right angles to the cutoff tank l4.
The pipes 18a and 18b are connected to the pipes 18a and 18b.

Main busbars for three phases are provided in pipes 17a and 17b, respectively! a. 1b
are arranged in a direction perpendicular to the plane of the paper, and the main buses Ia, lb are guided into the cable tank l6 via the cutoff tank l4. New circuit devices 8a and 8b are provided in pipes 17a and 17b, and include a breaker 2, a current transformer 3, and a grounding device 7a, 7.
b is provided in the breaker tank I4, and the disconnectors 8c and 8d
, the grounding device 7c, and the lightning arrester 5 are provided in the cable tank I6, the instrument transformer 6 is provided in the auxiliary tank (not shown), and the cable head 4 for connecting the load bus 27 is provided in the cable support frame 5. provided.

The units configured in this manner are connected by connecting the conduits 17a and 17b to each other.

Next, the operating mechanism of the grounding devices 7a and 7b will be explained based on FIG. 7.

SF above and below the cutoff tank l4. The upper rotating shaft 21 and the lower rotating shaft 22 are connected to each other through sealing materials 19 and 20 that prevent gas leakage.
is rotatably provided, and levers 23 and 24 are fixed to one end of the cutoff tank l4 that projects to the outside. The other end of each rotating shaft is supported by support members 40a and 40b. The lever 27, lever 24, and lever 23 fixed to the output shaft 26 of the drive source 25 are connected via links 28 and 29. Then, the upper rotating shaft 21. The lower rotating shaft 22 is provided with grounding devices 7b and 7a. The grounding devices 7b and 7a have the same configuration, and are as follows.

A pipe-shaped fixed contact 30 is fixed to each of the three-phase load bus 42 or the power supply bus 4l shown in FIG. Fixed. The insulating plate 31 is fixed to a fixed part, and a rod-shaped contact part 33
A movable contact 3 formed by integrally combining the and the insulating part 34
5 are respective current collecting fixed contacts 32 and fixed contacts 3
0 in a slidable manner. A grounding cable (not shown) is connected to each current collecting fixed contact 32.

The end face of each insulating part 34 is coupled to one surface of a connecting metal fitting 36, and a connecting plate 37 is fixed to the center of the other surface. The connecting plates 37 of the grounding devices 7b and 7a configured in this manner are interlocked and connected to the upper rotating shaft 21 and the lower rotating shaft 22 via a link 38 and a lever 39. Earthing device 7
b is set so that the movable contact 35 moves horizontally, and the grounding device 7a is set so that it moves vertically. This is the load bus 42. This corresponds to the direction in which the power supply bus 4l extends.

D. Problem to be Solved by the Invention However, as shown in FIG.
9.20 must be installed at two locations, resulting in high cost. Furthermore, since there are two locations where there is a risk of insulating gas leaking, reliability against gas leakage is low.

Therefore, an object of the present invention is to provide a gas insulated switchgear that solves the above problem.

E. Means for Solving the Problems The structure of the present invention to achieve the above object is to provide a rotary shaft of one piece of wood inside a tank filled with insulating gas, and fix the middle part of a lever to the rotary shaft. At the same time, one end of the lever is interlocked with one earthing device, and the other end of the lever is interlocked with another earthing device, and the end of the rotating shaft is passed through the tank via a sealing material, and the end is connected to the tank. It is characterized by being interlocked and connected to an external drive source.

F. When the output shaft of the driving source is rotated in one direction, the driving force is transmitted from the end of the rotating shaft into the tank, causing the tank to rotate in one direction. Therefore, one grounding device and the other grounding device are closed at the same time, and grounding is performed.

Conversely, when the output shaft of the drive source is rotated in the other direction, the rotating shaft rotates in the other direction, and one grounding device and the other grounding device open simultaneously.

G. EXAMPLES Hereinafter, the present invention will be explained in detail based on examples shown in the drawings. Note that this embodiment is an improvement on a part of the conventional gas insulated switchgear, so the same parts as the conventional gas insulated switchgear are given the same reference numerals, the explanation is omitted, and only the different parts will be explained.

(a) First embodiment The structure of the first embodiment of the gas insulated switchgear according to the present invention is as follows:
This will be explained based on FIGS. 1 and 2.

As shown in FIG. 2, in the present invention, the grounding device 7a is disposed at the upper left of the cutoff tank l4 at a position where the three-phase power supply bus 4l and the load bus 42 are close to each other, and the grounding device 7a.
7b are provided in close proximity.

Earthing device 7a. The structure of the operating mechanism for operating 7b is shown in FIG. A dogleg-shaped lever 43 is used instead of the lever 43 shown in FIG. 7, and its central portion is fixed to a single rotating shaft 2l. One end of the lever 43 is a link 38
The other end is operatively connected to the connecting plate 37 of the grounding device 7b via a link 38, and the other end is operatively connected to the connecting plate 37 of the grounding device 7a via a link 38. Here, the connecting fitting 36 in the grounding device 7a is installed above the insulating plate 3l, contrary to FIG. 7. The lever 23 provided at the end of the rotating shaft 21 passing through the cutoff tank l4 and the lever 27 of the drive source 25 are interlocked and connected via a link 49.

Although the three phases of the movable contacts are arranged in a triangular space minimum, the three phases may be arranged in parallel in the same direction.

Next, the operation of the gas insulated switchgear will be explained.

When the drive source 25 rotates the lever 27 in the clockwise direction of the solid line arrow, the driving force is transmitted to the lever 23 via the link 49, and the rotating shaft 21 rotates in the direction of the solid line arrow. Since the connecting plate 37 of the connecting fitting 36 is connected to both ends of the lever 43 via the link 38, the grounding device 7
The connecting fitting 36 b moves to the right in the figure and connects to the grounding device 7a.
The connecting fitting 36 moves downward in the figure. Therefore, the current collecting fixed contact 32 and the fixed contact 30 are electrically connected by the contact portion 33 of the movable contact 35, and the grounding devices 7a and 7b are closed at the same time. As a result, the three-phase power supply bus 4l and the load bus 42 are simultaneously grounded.

Conversely, when the lever 27 is rotated counterclockwise by the driving source 25, each of the aforementioned members rotates or moves in the direction of the dashed arrow, and the grounding devices 7a, 7b open. In other words, the grounding is released.

Since the grounding devices 7a and 7b are arranged at the upper left of the breaker tank 14, the height of the conduits 17a and 17b from the floor is lowered, and the number of current transformers 3 installed above the breaker 2 is reduced in the vertical direction. It is possible to provide more than one.

(b) Second Embodiment A second embodiment of the gas insulated switchgear according to the present invention is shown in FIG.
It is shown in Figure 4. In this embodiment, the grounding device 17b of the first embodiment is rotated 90 degrees counterclockwise around the rotating shaft 21, so only the parts that are different from the first embodiment will be explained.

As shown in FIG. 3, the middle part of the lever 46, which does not rotate, is fixed to the rotating shaft 2l, and a grounding device is connected to both ends of the lever 46 via links 38. a and 7b are interlocked and connected. In this embodiment, in order to fix the fixed contact 30 of the grounding device 7a, the left end of the load bus bar 42 in FIG. 4(a) is bent upward.

In this embodiment, by rotating the lever 27 of the drive source 25 in the counterclockwise direction indicated by the solid line arrow, the rotating shaft 2l is rotated in the direction of the solid line arrow, and the movable contact 35 of the grounding device 7b is raised, and the grounding device 7a is movable. Contact 35 is lowered and grounded. Conversely, when the lever 27 is rotated clockwise, the grounding is released.

H. Effects of the Invention As can be seen from the above explanation, the gas insulated switchgear according to the present invention has the following effects.

Since a single rotating shaft, in which one grounding device and another grounding device are interlocked and connected, is passed through the tank and connected to the drive source, the sealing material provided at the part where the rotating shaft passes through is provided at one place. That will be enough.

Therefore, the structure of the gas insulated switchgear is simplified, the cost is reduced, and the reliability against gas leakage is improved.

[Brief explanation of drawings]

1 and 2 relate to a first embodiment of the gas insulated switchgear according to the present invention, FIG. 1 is a configuration diagram showing the operating mechanism of the grounding device, and FIG. 2 is a diagram showing the configuration of the gas insulated switchgear. So, Figure 2(a) is a front view, and Figure 2(b) is 1 of Figure 2(a).
-1 arrow view, and Figures 3 and 4 relate to the second embodiment of the gas insulated switchgear according to the present invention, Figure 3 is a configuration diagram showing the operating mechanism of the earthing device, and Figure 4 is the gas insulated switchgear. Fig. 4(a) is a partial sectional view, Fig. 4(b) is a view taken along arrow III-III in Fig. 4(a), and Figs. 5 to 7 are views of the conventional device. Regarding gas insulated switchgear, Fig. 5 shows the wiring diagram of the gas insulated switchgear unit, and Fig. 6 shows the configuration of the gas insulated switchgear, Fig. 6(a) is a plan view, and Fig. 6(b) is a front view, FIG. 6(c) is a view from the ■-■ arrow in FIG. 6(b),
FIG. 7 is a configuration diagram showing the operating mechanism of the grounding device. 7a, 7b...Grounding device, l4...Shutoff tank,
l9...Sealing material, 2! ... Rotating shaft, 25... Drive source, 23, 27, 43.46... Lever, 49...
·Link. Fig. 1 Fig. 3 (a) Evil ben-men man 7 m (b), t4 [a) 0 ■ - m power sight m 41 Fig. 5 Kasu Togen rescue opening/closing unit 0 Heiku Qing Funakariichi 84 1st Figure 6 (C) Nine ffi (b) frl[-1t lotus figure (a) Plane area

Claims (1)

[Claims] (1) A rotating shaft is provided inside a tank filled with insulating gas, and the middle part of the lever is fixed to the rotating shaft, and one end of the lever is connected to one grounding device, and the other end of the lever is connected to another grounding device. 1. A gas insulated switchgear, characterized in that the rotating shaft is interlockingly connected to the respective devices, the end of the rotating shaft is passed through the tank via a sealing material, and the end is interlockingly connected to a drive source outside the tank.