JPH0443520A - Gas insulated switchgear - Google Patents

Abstract

PURPOSE:To reduce the height of a gas insulating switchgear and to improve the reliability to a gas leakage by providing earthing devices for three phases at the lower side of a breaker and at the lower side of a current transformer, and linking and connecting the earthing devices to an operating means through an operating shaft. CONSTITUTION:At the lower side of a breaker 2, one side earthing device 7a is provided along the other straight line (b) parallel to one side straight line (a), for three phases. And at the lower side of a current transformer 3 and at the position higher than the earthing device 7a, an earthing device 7b is provided along the other straight line (c) parallel to the straight line (a), for three phases. And by rotating a handle 65 in the direction of the solid line arrow, a rod 62 is lowered, and an operating shaft 52 is rotated to the left. As a result, movable rods 47 and 48 are inserted in contacts 43 and 44 at the fixing side, and made in the earthing condition. When the handle 65 is rotated in the direction of the broken line arrow, the movable rods 47 and 48 are separated from the contacts 43 and 44 at the fixing side, and the earthing is released.

Description

DETAILED DESCRIPTION OF THE INVENTION A. Field of Industrial Application The present invention relates to a gas insulated switchgear in which the arrangement and configuration of parts within a tank are modified.

B8 Summary of the Invention The present invention provides a gas insulated switchgear in which a three-phase circuit breaker and a current transformer are arranged side by side inside a tank filled with insulating gas, and two sets of grounding devices are housed. The height of the gas-insulated switchgear can be reduced by placing grounding devices for three phases under the current transformer and the current transformer, and by interlocking and connecting each grounding device to the operating means via a single operating shaft. At the same time, it improves reliability against gas leaks, and also makes it possible to support the upper and lower ends of the power supply bus.

C8 Prior Art First, the connection state of a gas insulated switchgear unit (hereinafter simply referred to as a unit) will be explained based on 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 a voltage transformer, 7a to 7C are grounding devices, 8
a to 8d are disconnectors.

Next, a gas insulated switchgear (hereinafter simply referred to as the device) consisting of a unit with such wiring connections is shown in Figs. 5(a) to (C).
The explanation will be based on. As shown in the figure, the device is constructed by connecting a plurality of units ioa, 10b, . . . in one direction.

Each unit has the same structure, for example, unit lo
g is as shown in FIG. 5(b). As shown in the figure, a breaker block 12a, a main bus bar block 12b, and a line side block 12c are formed on the base 11. The cutoff block 12a has a frame 13 on the base 11 and a frame 13
Consists of upper cutoff tank 14, etc., and track side block 12
c consists of a cable support frame 15 on the base 11, a cable tank 16, etc. The main busbar block 12b has conduits 17a and 17b extending in a direction perpendicular to the plane of the drawing, and a conduit 17a.
, 17b at right angles and the cutoff tank 14
It is composed of pipe lines 18a and 18b connected to.

The main bus lines 1a and lb for three phases are connected to the pipes 17a and 17b, respectively.
are arranged in a direction perpendicular to the plane of the paper, and the main busbars la and lb are guided into the cable tank 16 via the cutoff tank 14. The disconnectors ga, 8b are provided in the conduits 17a, 17b, and include the circuit breaker 2° current transformer 3. The grounding devices 7a and 7b are provided in the breaker tank 14, the disconnectors 8c and 8d, the grounding device 7C1 and the lightning arrester 5 are provided in the cable tank 16, the voltage transformer 6 is provided in an auxiliary tank (not shown), and the load A cable head 4 for connecting the busbar 27 is provided in the cable support frame 15.

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. 6.

Upper rotating shaft 21° and lower rotating shaft 22 are connected via sealing material 19.20 to prevent leakage of SF6 gas above and below the isolation tank I4.
is rotatably provided, and levers 23 and 24 are fixed to one end of the cutoff tank 14 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. Grounding device 7b.

7a has the same configuration and is as follows.

A pipe-shaped fixed contact 30 is fixed to each of the three-phase load bus 42 or power supply bus 41 shown in FIG. is fixed. Insulating plate 31
is fixed to the fixed part, and the rod-shaped contact part 3
A movable contact 35, which is formed by integrally combining the current collecting fixed contact 32 and the fixed contact 30, is slidably inserted into the current collecting fixed contact 32 and the fixed contact 30, respectively. A grounding cable (not shown) is connected to each current collecting fixed contact 32. The end surface of each insulating portion 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. Grounding devices 7b and 7a configured in this way
A connecting plate 37 is operatively connected to the upper rotating shaft 21° and the lower rotating shaft 22 via a link 38 and a lever 39. The grounding device 7b is set so that the movable contact 35 moves in the horizontal direction, and the grounding device 7a is set so that the movable contact 35 moves in the vertical direction. This is the load bus 42. This corresponds to the direction in which the power supply bus 41 extends.

Problems that D0 invention attempts to solve However, there are grounding devices 7b above and below the power bus 41.

7a increases the height H of the gas insulated switchgear, and the presence of the grounding device 7a also increases the height of the conduit 17a. Furthermore, since the link 29 connecting the upper rotating shaft 21 and the lower rotating shaft 22 is provided outside the isolation tank 14, sealing materials must be provided at two locations, increasing the risk of gas leakage and increasing costs. . Furthermore, the grounding device 7a
, 7b get in the way, making it difficult to support the power supply bus 41 at its upper and lower ends.

Note that gas insulated switchgears for private customers, power distribution, etc. do not require the current transformer 3, but even if the current transformer 3 is removed, the size cannot be reduced because of the presence of the grounding device 7b.

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

Means for Solving the E0 Problem The configuration of the present invention to achieve the above object includes a three-phase circuit breaker extending vertically inside a tank filled with insulating gas, and a three-phase circuit breaker The power bus and load bus that are connected to the circuit breaker are placed on both sides of the circuit breaker, the current transformer installed on the load bus is placed next to the circuit breaker, and a grounding device is installed on each power bus and load bus. In a gas insulated switchgear, the power supply bus bars for three phases are arranged on one straight line, one grounding device is arranged below the circuit breaker on a straight line parallel to the first straight line, and the other grounding device is changed. It is placed below the flow vessel on a straight line parallel to the first straight line, has one operating shaft parallel to the first straight line rotatably provided in the tank, and is operated via a pair of arms and a connecting rod. One of the respective grounding devices is interlocked and connected to a single insulating plate attached to the shaft, and the other respective grounding device is interlocked and connected to the operating shaft via one arm and a connecting rod, and the other respective grounding devices are interlocked and connected to the operating shaft via a single arm and connecting rod. It is characterized in that the operating shaft and the operating means provided outside the tank are interlocked and connected by a rod that passes through the tank.

When the F1 action operating means is operated, the operating shaft is rotated via the rod, and the two sets of grounding devices are simultaneously connected or disconnected.

Since one grounding device is located below the three-phase circuit breaker and the other grounding device is located below the three-phase current transformer,
The height of the gas insulated switchgear is smaller compared to the conventional case where it is located above and below the power supply bus.

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) Structure of Example The structure of the gas insulated switchgear according to the present invention is shown in FIGS. 1 to 3.
This will be explained based on the diagram.

As shown in FIG. 2, a power supply bus 41 is arranged on one straight line (A), and three-phase circuit breakers 2. The load busbars 42 are arranged at the vertices of the isosceles triangle, and the power supply busbars 41 . Load bus 4
2 is located. Each of the load buses 42 is provided with a current transformer 3, and the current transformers 3 are arranged next to the circuit breaker 2.

As shown in FIG. 1, the three-phase power supply bus 41 has its upper and lower ends connected to the lid 9 and the cutoff tank 1 through insulators 58 and 59.
The mounting is supported by a mounting plate 60 that closes the bottom of 4. Below the circuit breaker 2, one grounding device 7a is arranged for three phases along one straight line (a) and another straight line (b) parallel to the first straight line (a). Further, below the current transformer 3 and at a higher position than the grounding device 7a, another grounding device 7b for three phases is arranged along another straight line (c) parallel to the first straight line (a). .

Next, the grounding devices 7a, 7b and their operating mechanisms will be explained in detail based on FIG. 3. A fixed side contact 43 is provided at the lower end of each of the power bus bars 41 to protrude to the right along the first straight line (A), and a fixed side contact 43 is provided at the lower end of each of the load bus bars 42 to protrude to the right along the first straight line (A). A fixed side contact 44 is provided that protrudes downward along the straight line (C). On the other hand, the movable side contacts 4 facing the fixed side contacts 43 and 44
5 and 46 are fixed, and movable rods 47 and 48 are provided slidably within the movable side contacts 45 and 46.

The movable contacts 45, 46 are connected to the ground terminal box 51 via cables 49, 50. This ground terminal box 51
is connected to earth. The mounting plate 60 is rotatably provided with an operating shaft 52 parallel to the straight line (A) via a bearing 66, and two arms 53 and one arm 67 fixed to the operating shaft 52 connect to the connecting rod 54. and is connected to the movable rod 48 via an insulating plate 55. Furthermore, two arms 68 fixed to the operating shaft 52 are connected to one insulating plate 57 via a connecting rod 69 and a link 56, and movable rods 47 for three phases are connected to one insulating plate 57. be done. The upper end of the rod 62 is connected to one end of the arm 67, and the rod 62 is guided into the frame 13 below the mounting plate 60 via a sealing material 63. The lower end of the rod 62 is connected to an operation box 64 as an operation means. The operation box 64 is configured so that the rod 62 can be raised and lowered by means of an L-shaped handle 65. In this way, the operation box 64 is configured so that the rod 62 can be moved up and down. Since the grounding devices 7a and 7b are arranged under the current transformer 3, the power bus 41 can be extended up and down more than before, and the upper and lower ends of the power bus 41 are fixed to the lid 9 etc. via insulators 58 and 59. It can be done.

(b) Function of the embodiment Next, the function of the gas insulated switchgear will be explained based on FIG.

When the handle 65 is rotated in the direction of the solid arrow, the rod 62 is lowered and the operating shaft 52 is rotated to the left.

Therefore, the movable rods 47 and 48 are connected to the fixed side contact 4.
3.44 and becomes grounded.

When the handle 65 is rotated in the direction of the dashed arrow, the movable rods 47 and 48 move away from the fixed contacts 43 and 44, and are released from the ground.

(6) 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.

(a) Since grounding devices are not arranged above and below the power bus, the height of the gas insulated switchgear can be reduced accordingly, and the conduit line in which the main bus is arranged can also be made lower.

(b) Since there is only one operating shaft for operating both grounding devices, there is only one rod that passes through the tank, and there is one less sealing material attachment point than in the past, and reliability against gas leaks is higher than in the past.

(c) Since the grounding device is not in the way, the power supply bus bar can be supported at either the top or bottom end, improving reliability.

(d) Since one grounding device and the other grounding device are arranged close to each other, the gas insulated switchgear can be downsized. Further, only one operating shaft is required, and the link connecting the operating shaft and the grounding device can be short. Furthermore, it is easy to ensure an insulating distance, and wiring of the grounding wire is also easy.

(e) Only a single insulating plate needs to be interposed to operate the grounding device 7a, and there is no need to provide each one separately, resulting in a reduction in the number of parts.

[Brief explanation of the drawing]

Figures 1 to 3 relate to an embodiment of the gas insulated switchgear according to the present invention, in which Figure 1 is a configuration diagram of the gas insulated switchgear, Figure 2 is a layout diagram inside the breaker tank, and Figure 3 is a grounding device. Fig. 4 is a wiring diagram of a gas insulated switchgear unit, and Figs. 5 and 6 relate to a conventional gas insulated switchgear.
Figure 5(a) is a plan view, Figure 5(b) is a front view, Figure 5(c) is a view taken along the nn arrow in Figure 5(b), and Figure 6 is the operating mechanism of the grounding device. FIG. 2... Circuit breaker, 7a, 7b... Grounding device, 14...
- Shutoff tank, 41...Power bus, 42...Load bus, 52...Operation shaft, 53 67.68...Arm, 54°69...Connecting rod, 57...Insulating plate, 62
... Rod, 63 ... Seal material, 64 ... Operation box. Fig. 8 Fig. 4 Cuff J rescuing opening/closing unit 0 Jari Iz (a) Plane date Fig. 5 Gabu gamma device 0 Sui Hirokuni (covered) (C) 5th concave (b) I-! I arrow turtle illustration + 2b “--ゝ-11

Claims (1)

[Claims] (1) A tank filled with insulating gas is equipped with a three-phase circuit breaker that extends vertically, and a power bus and a load bus that are connected to the three-phase circuit breaker are placed on both sides of the circuit breaker. In a gas-insulated switchgear in which a current transformer is installed on the load bus bar next to the circuit breaker, and a grounding device is provided on each power bus bar and load bus bar, the power bus bars for three phases are placed on one straight line. and one grounding device is placed below the circuit breaker on a straight line parallel to the first straight line, and the other grounding device is placed below the current transformer on a straight line parallel to the first straight line, A single operating shaft parallel to a straight line is rotatably provided in the tank, and each grounding device is interlocked with a single insulating plate attached to the operating shaft via a pair of arms and a connecting rod. The other respective earthing devices are interlocked and connected to the operating shaft via one arm and a connecting rod, and the operating means provided outside the operating shaft and the tank is connected by a rod that penetrates the tank via a sealing material. A gas insulated switchgear characterized by interlockingly connected.