JPH03218206A - Gas-insulated contactor - Google Patents

Abstract

PURPOSE:To improve safety and reduce the size of equipment by positioning circuit breakers for 3-phase use at the vertex of a triangle, provided with two sets of grounding devices, each for 3-phase use, positioned in line and interlocked with an operating means installed at the outside through a sealing material. CONSTITUTION:Grounding devices 7a and 7b for 3-phase use are positioned at each of the upper and lower parts of circuit breakers 2 for 3-phase use. Power supply bus bars 41 and the circuit breakers 2 for 3-phase use are positioned at the vertex of a triangle. There is a gap between the circuit breakers 2 and the grounding devices 7b and 7a for 3-phase use are provided in the gap at the upper and lower parts of the circuit breakers 2 respectively. Upper and lower operating shafts are linked to rods and led to the outside of a breaking tank 14 through a sealing material. This enables reduction of cost for building premises by reducing height of the ceiling in case of installing the equipment in an underground substation, etc.

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 equipped with a three-phase circuit breaker and two sets of grounding devices for each phase inside a tank filled with insulating gas. -L, located between the three-phase circuit breakers at the top and bottom, and driving the three-phase grounding devices, respectively.
By connecting the lower operation shaft via a link provided inside the tank and interlockingly connecting it to the operating means outside the tank via a rod, the height of the gas-insulated switchgear is reduced and reliability against gas leaks is improved. Moreover, it is possible to support the two lower ends of the power supply bus.

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 Ia and Ib, 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 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 busbar block 12b, and a line side block 12c are formed on a base 11. The cutoff block 12a is composed of the frame l3 and the frame 13 of the base Ill.
Consists of upper cutoff tank 14, etc., and track side block 12
C consists of a cable support frame l5 on a base l, 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 14.
The pipes 18a and 18b are connected to the pipes 18a and 18b.

3 The main bus lines lλ. Ib
are arranged in a direction perpendicular to the plane of the paper, and the main buses Ia and Ib are guided into the cable tank 16 via the cutoff tank l4. The disconnectors 8a, 8b are provided in the pipes 172L, 17b, and the disconnectors 2, current transformers 3, and grounding devices 7a, 7b
Disconnectors 8c, 8d,
Grounding device 7C. The lightning arrester 5 is installed in a cable tank 16, the voltage transformer 6 is installed in an auxiliary tank (not shown), and the cable head 4 for connecting the load bus 27 is installed in the cable support frame 15. It will be done.

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 is shown in FIG. The explanation will be based on.

The rotary shaft 21 is connected to the bottom of the cutoff tank 14 through a sealing material 19 and 20 that prevents leakage of SFIl gas. The lower rotating shaft 22 is rotatably provided, and a lever 2324 is fixed to one end that projects to the outside of the cutoff tank I4. The other end of each rotating shaft is supported by support members 40a and 40b. The lever 2 fixed to the output shaft 26 of the drive source 25
7, lever 24, and lever 23 are connected via links 28 and 29. Then, the upper rotation shaft 2], the lower rotation shaft 22
are provided with grounding devices 7b and 7a. earthing device 7b,
7a has the same configuration, and has the following J; A pipe-shaped fixed contact 30 is fixed to each of the three-phase load bus 42 or power supply bus 4I shown in FIG. 6(c), and a pipe-shaped current collecting fixed contact 32 is attached near the apex of the triangular insulating plate 3I. Fixed. The insulating plate 3I is solidified into a fixed part, and a movable contact 35 is formed by integrally joining a rod-shaped contact part 33 and an insulating part 34.
are the respective current collecting fixed contacts 32 and fixed contacts 1 and 3.
0 in a slidable manner. A grounding cable (not shown) is connected to each of the current collecting fixed contacts 1 and 32. The ends of each insulating portion 34 are connected 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 single rotation shaft 21 and the second rotation shaft 22 via a link 38 and a lever 39. The grounding device 7b is set so that the movable contact 35 moves horizontally, and the grounding device 7a is set so that the movable contact 35 moves vertically. The dirt is on the load bus bar 42. It corresponds to the direction in which the power supply bus 41 extends.

D Problems to be Solved by the Invention However, since the grounding devices 7b7a are disposed above and below the power supply FJ line 41, the height T{ of the insulated switchgear increases, and the presence of the grounding device 7a causes the conduit to become The height of 17a also increases. In addition, -L rotation axis 21 and lower rotation axis 22
The link 29 connecting the is installed outside the cutoff tank I4 (
Therefore, it is necessary to install the holes in two places, which increases the risk of gas leakage and increases the cost. Furthermore, since the grounding devices 7a and 7b get in the way, it becomes difficult to support the electric grid bus 4l 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 grounding device 7b is not present, so it 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 Problem The structure of the present invention to achieve the above object is to arrange circuit breakers for three rivers extending in the same direction inside a tank filled with insulating gas at the vertices of a square. Two sets of grounding devices are installed between the circuit breakers for the main phase, at the upper and lower positions, on the same straight line for each of the three phases (J, -1).
The north operating shaft drives the grounding device for each of the three phases in the second part and the bottom.
The lower operating shaft is provided approximately parallel to each other between the circuit breakers for the three phases, and is interlocked and connected inside the tank via a link.A rod that penetrates the tank via a sealing material connects the link and the outside of the tank. It is characterized in that the provided operating means are interlocked and connected.

F. When the action operation means is operated, the lower operation shaft is activated via the rod and link. ''One operating shaft rotates, respectively, and the two sets of grounding devices are connected or disconnected.

Since the grounding device is located between the three-phase circuit breakers, the height of the gas-insulated switchgear is smaller than in 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. Grounding devices 7b and 7a for three phases are arranged at the bottom, respectively. The arrangement of the grounding devices 7b and 7a is shown in Fig. 3(a).
Shown in (b). As shown in the figure, a three-phase power supply bus 4l and a circuit breaker 2 are arranged at the vertices of a triangle, respectively.

There is a large gap between the circuit breakers 2, and a grounding device 7b is provided in the upper gap of the circuit breaker 2, and a grounding device 7a is provided in the lower gap, respectively. Each earthing device 7
a and 7b are configured as follows. As shown in FIG. 2 and FIG. 3, fixed side contacts 43 are located above and below each circuit breaker 2.
44 is provided, and as shown in FIGS. 3(a) and 3(b), the three rivers are arranged on the same straight line (a) and (b).

And I-, the lower operation axis 45 parallel to the straight line (A) (mouth)
．． The movable side contactors 1 and 48 are separated into three phases (with the lower operating member 46 connected to the lower operating member 46 via the arm 49). One movable side contact 50 is provided so as to be rotatable.The convex J movable side contacts 48 and 50 are provided with grounding cables 48a and 50.
a is connected. These vertical operation shafts 4.5 and 4.6 are rotatably attached to the ends of arms 51 and 52 and connected within the cutoff tank 14 via links 53.

A rod 54 is connected to the lower end of the link 53.
4 should be led to Uiro in cutoff tank 14 via Seal Shrine 55. The lower end of the lock 1.54 is connected to an operation box 56 as an operation means. Operation box 56
is configured so that the rod 54 can be raised and lowered by means of an L-shaped handle 57.

In this way, the grounding devices 7λ, 7b are installed between the circuit breakers 2 for three phases.
Because of the arrangement, the power supply bus 4l can be extended up and down more than before, and the two lower ends of the power supply bus 4l are covered with an insulator 58.
It is fixed to the lid 9 etc. via 59.

(b) Operation of the embodiment Next, the operation of the gas insulated switchgear will be explained based on FIG. 2.

When the handle 57 is rotated in the direction of the solid arrow, the rod 54 and link 53 rise, the upper operating shaft 45 rotates to the left, and at the same time the lower operating shaft 46 rotates to the right. Therefore, the movable side contacts 48.50 come into contact with the fixed I2 fixed side contacts 43.44, and are in a grounded state.

When the handle 57 is rotated in the direction of the dashed arrow, the movable side contacts 48.50 are moved to the fixed side contacts 43.50.
44 and the ground is 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 a comparison with the gas insulated switchgear shown in FIG. 1, the height H is significantly smaller. Therefore, when installing in an underground substation or 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.

As shown by the imaginary line in FIG. 3(a), when manholes 60 and 61 are provided on the side of the breaker tank I4 in order to replace the arc extinguishing chamber of the circuit breaker 2, Since the distance between the shafts between the grounding devices 7b is smaller than the distance between the grounding devices 7b, replacement work becomes easier.

1-{ 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 device is placed below -1 of 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 lowered.

(b) Since the link that interlocks and connects the upper operating shaft and the lower operating shaft is located within the tank, the number of sealing material attachment points is reduced by one compared to the conventional system, and the reliability against gas leakage is higher than that of the conventional system.

[5 (c) Since the grounding device is not in the way, the power supply busbar can be supported at either the two ends or the bottom end, improving reliability.

[Brief explanation of drawings]

1 to 3 relate to an embodiment of the gas insulated switchgear according to the present invention, FIG. 1 is a block diagram of the gas insulated switchgear, FIG. 2 is a block diagram showing the operating mechanism of the grounding device, and FIG. 3 is a block diagram of the gas insulated switchgear. (a) is a view taken along the line II in FIG. 1, FIG. 3(b) is a view taken along the ■-■ arrow in FIG. 1, and FIG. 4 is a configuration diagram of a gas-insulated switchgear showing another embodiment. , Fig. 5 is a wiring diagram of a gas insulated switchgear unit, Figs. 6 and 7 relate to a conventional gas insulated switchgear, and Fig. 6 (a)
) is a plan view, FIG. 6(b) is a front view, FIG. 6(c) is a view from the ■-■ arrow in FIG. 6(b), and FIG. 7 is a configuration diagram showing the operating mechanism of the grounding device. be. 16 2. Circuit breaker, 7a, 7b...Grounding device, I4...Shutoff tank, 45...'2 operation axis, 46.Lower operation axis, 5
3... Link, 54... Rod, 55... Seal material, 56... Operation box. -7a ○b

Claims (1)

[Claims] (1) Inside a tank filled with insulating gas, three-phase circuit breakers extending in the same direction are placed at the apex of a triangle, and between the three-phase circuit breakers, at the upper and lower positions, Two sets of grounding devices are installed on the same straight line, each for three phases, and the upper operating shaft and lower operating shaft, which drive the upper and lower three-phase grounding devices, are connected between the circuit breakers for the three phases. They are arranged approximately parallel to each other and are interlocked and connected inside the tank via a link, and the link and the operating means provided outside the tank are interlocked and connected by a rod that penetrates the tank through a sealing material. gas insulated switchgear.