JPH03215104A - Gas insulation switchgear - Google Patents

Abstract

PURPOSE:To improve reliability on countermeasure against gas leakage while decreasing height of a gas insulation switchgear by arranging grounding cables of three-phase system respectively under a breaker and a current transformer while connecting the respective grounding devices with an operating means through a single operating shaft. CONSTITUTION:Power bus bars 41 of three-phase amount are mount-supported, with their upper and lower ends to a cover 9 through insulators 58, 59, and to a mounting plate 60 for closing the lower of a breaking tank 14. One grounding device 7a of three-phase system is arranged along one straight line in the lower of a breaker 2. While the other grounding devices 7b of three-phase system is arranged along the other straight line in the lower of a current transformer 3 and in a position higher than the grounding device 7a. Since the grounding devices 7a, 7b of three-phase system are arranged below the breaker 2 and the current transformer 3 in this way, the power bus bars 41 can be more vertically extended than conventional one.

Description

[Detailed Description of the Invention] A. INDUSTRIAL APPLICATION FIELD The present invention relates to a gas insulated switchgear in which the arrangement and configuration of parts within a tank are modified.

B. 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. By arranging grounding devices for three phases below and below the current transformer, and by interlocking and connecting each grounding device to the operating means via a single operating shaft, the height of the gas insulated switchgear can be reduced. It is smaller, has improved reliability against gas leaks, and can support the upper and lower ends of the power supply bus.

C. BACKGROUND OF THE INVENTION First, the connection state of a gas-insulated switchgear unit (hereinafter simply referred to as UNINOTO) 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 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. 6(a) to (C).
The explanation will be based on. As shown in the figure, the device is constructed by connecting a plurality of Uninotes 10a, 10b, . . . in one direction.

Each unit has the same structure, for example, Uninote 10
a is as shown in FIG. 6(b). As shown in the figure, a cutoff block 12a, a main bus bar block 12b, and a line side block 12c are formed on the heath 11. The cutoff block 12a is connected to the frame l3 on the base 11 and the frame 13.
Consists of upper cutoff tank 14, etc., and track side block 12
C consists of a cable support frame 15 on a base 11, a cable tank 16, etc. The main bus block 12b includes 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 14.
It is composed of conduits 18a and 18b connected to.

The main bus lines 1a, lb for three phases are connected to the pipes 17a, 17b, respectively.
are arranged in a direction perpendicular to the plane of the paper, and the main buses la and lb are guided into the cable tank 16 via the cutoff tank l4. The disconnectors 8a and 8b are provided in the pipe lines 17a and 17b, the breaker 2, the current transformer 3, and the grounding devices 7a and 7b are provided in the breaker tank 14, and the disconnector 8c +
8 d + grounding device 7c, lightning arrester 5 is cable tank 1
The instrument transformer 6 is provided in an auxiliary tank (not shown), and the cable nozzle 4 for connecting the load bus 27 is provided in the cable support frame 15.

Each of the UNI SOTS configured in this manner is connected by connecting the pipes 17a and 17b to each other.

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

Upper and lower rotating shafts 21 and 22 are installed above and below the cutoff tank 14 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 14 that projects to the outside. The other end of each rotating shaft is supported by support members 40a and 4Qb. 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. The upper rotating shaft 21 and the lower rotating shaft 22 are provided with grounding devices 7b and 7a. The grounding devices 7b and 7a have the same configuration, and are as follows.

? Load bus 42 or i for three rivers shown in Figure 6 (l)
ii J! 7 f/J: Pipe-shaped fixed contact 30 or fixed 5E at -141, respectively. A pipe-shaped TEPCO fixed contact 32 is fixed near the rectangular point on the insulating plate 31 in the shape of 3 (II). A movable contact 35 formed by integrally bonding an insulating member 34 and a movable contact 35 is slidably inserted into each current collecting fixed contact 32 and fixed contact 30.Each TEPCO fixed contact 3
2 is connected to a grounding cable (not shown). The end surface of each insulator 34 is connected to one surface of a single connecting metal shell 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 rotation shaft 21 and the lower rotation shaft 22 via the link 38 and the rehear 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 corresponds to the direction in which the load bus 42 and the power supply bus 4l extend.

D. Problems to be Solved by the Invention However, since the grounding devices 7b and 7a are arranged above and below the power supply bus bar 41, the height of the gas-insulated switchgear increases, and the presence of the grounding device 7a increases the height of the conduit 17a. The height also increases. Furthermore, since the link 29 connecting the upper rotating shaft 21 and the lower rotating shaft 22 is provided outside the cutoff tank 14,
Sealing materials must be provided at two locations, increasing the risk of gas leakage and increasing costs. Furthermore, earthing devices 7a, 7
Since b becomes a hindrance, it becomes 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 earthing device 7b is still present, so the current transformer 3 cannot be made smaller.

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 for achieving the above object includes a three-phase circuit breaker extending vertically inside a tank filled with insulating gas. A power bus and a load bus that are connected to In insulated switchgear, one grounding device is placed in a straight line below the circuit breaker,
The other grounding device is placed below the current transformer on another straight line parallel to the first straight line, and one operating shaft parallel to the first straight line is rotatably provided in the tank, and a link is provided. The operating shaft is interlocked and connected to each grounding device through the tank, and the operating shaft and the operating means installed outside the tank are interlocked and connected by one rod that penetrates the tank through a sealing material. .

F. When the operating means is operated, a single operating shaft is rotated via the rod, and the two sets of earthing devices are connected or disconnected.

One grounding device is located below the three-phase circuit breaker, and the other grounding device is located below the three-phase current transformer. In comparison, the height of gas-insulated switchgear is smaller.

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.
The explanation will be based on the diagram.

As shown in FIG. 2, the three-phase circuit breaker 2, power bus 41, and load bus 42 extending in the vertical direction are each placed at the apex of an isosceles triangle, and the power bus 41 is placed on both sides of the circuit breaker 2.
, the load bus 42 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.
It is attached and 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.

Further, another grounding device 7b for three phases is arranged below the current transformer 3 and at a higher position than the grounding device 7a along another straight line.

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 4I and protrudes to the right in FIG. ) is provided with a fixed side contact 44 that projects downward in FIG. On the other hand, the movable contact l-45.46 facing the fixed contact 43.44 is fixed, and the movable loft 47.4 is slidably inside the movable contact 45.46.
8 are provided. The movable contacts 45, 46 are connected to the ground terminal i51 via cables 49, 50. This ground terminal box 51 is connected to earth. Mounting plate 60
is provided with an operating shaft 52 that is rotatably parallel to the straight line (A) via a thin bearing as shown in the figure, and 3 fixed to the operating shaft 52.
The two arms 53 are connected to the movable rods 47 and 48 via a link 54 and an insulating plate 55 or a link 56 and an insulating plate 57. The upper end of a rod 62 is connected to one end of the operating shaft 52 via an arm 6I, and the rod 62 is connected to a knoll strike 63.
is guided into the frame l3 on the side of the temporary attachment 600r. The lower end of the lot 62: Connected to an operation box 64 as an operation means. The operation box 64 is configured such that it can be raised and lowered by the L-shaped handle 65. In this way, the grounding device 7a. By arranging 7b and adding 12 f, the power supply bus 4I can be extended up and down more than before, and the upper and lower ends of the power supply bus 4l can be seen on the lid 9 etc. through the insulators 58 and 59.

(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 rises and the operating shaft 52 rotates to the left.

For this reason, the driving terminals 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, 48 move away from the fixed contacts 43, 44, and are grounded or released.

Among gas-insulated switchgears, those for private customers and electric power distribution do not need to be provided with a current transformer 3, and the height H can be reduced as shown in FIG. As can be seen from the comparison with the gas insulated switchgear shown in Fig. 1, the height + { is significantly smaller.

Therefore, when installing in an underground substation or inside a building, there is no need to increase the height of the ceiling, and the manufacturing cost of the building is also reduced. Even in the case of power transmission, the height H can be reduced if the number of current transformers is small or if an optical current transformer is used.

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.

(a) Since no grounding devices are placed above and below the power bus, the height of the gas-insulated switchgear can be reduced accordingly, and the conduit in which the main bus is arranged can 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 attachment point for the noul material 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 bus 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.

[Brief explanation of drawings]

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 block diagram showing the operating mechanism of the gas insulated switchgear according to another embodiment, Fig. 5 is a wiring diagram of the gas insulated switchgear unit, and Figs. Regarding gas insulated switchgear,
Figure 6(a) is a plan view, Figure 6(b) is a front view, Figure 6(C) is a view from the ■1■ arrow in Figure 6(b), and Figure 7 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 axis, 54.56...Link, 6
2...Ronodo, 63...Sealing material, 64...Operation box. Figure 3 5F! 15 Zuryokusu-based peace and defeat unit 0-series Caoyu LIF Fig. 6 and reverse border check-off abacus 0 course wide map (in the United States) (C) O6ffi (b) ol-11j. lI(a) Plan view

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 installed on each power bus and load bus, one of the grounding devices is connected in one straight line below the circuit breaker. The other grounding device is placed below the current transformer on another straight line parallel to the first straight line, and one operating shaft is freely rotatable in the tank parallel to the first straight line. At the same time, the operating shaft is interlocked and connected to each grounding device via a link, and the operating shaft and the operating means provided outside the tank are interlocked and connected by a rod that penetrates the tank through a sealing material. Characteristic gas insulated switchgear.