JPH08154316A - Gas insulated miniature switchgear - Google Patents

Abstract

PURPOSE: To miniaturize the operating mechanism of a gas insulated miniature switchgear to be easily regulated and to miniaturize the entire switchgear. CONSTITUTION: Operating units 20a to 20c of vacuum circuit breakers of respective phases are provided longitudinally, and coupled via coupling links 17a, 17b, etc. A closing driver 9 for driving to close the breaker is coupled to the V-phase operating unit 20b, and the driver 9 is provided in the front of the unit 20b.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas-insulated reduction type switchgear having an electric spring operated circuit breaker.

[0002]

2. Description of the Related Art FIGS. 5 (a) and 5 (b) are a front view and a side view of a conventional gas-insulated reduction type switchgear, and FIGS.
(B) is a longitudinal cross-sectional view of a main part of a conventional gas-insulated reduction type switchgear and a vertical sectional side view of the main part. In the figure, reference numeral 1 is a tank provided on a pedestal 2. Inside the tank 1, pole columns 3a to 3c of U, V, and W phases attached to a mounting plate 2a on the pedestal 2 are arranged in the front-rear direction. And the poles 3a to 3c are composed of a pair of vacuum circuit breakers 4, an intermediate mechanism 5, and a shield part 6. In the tank 1, a disconnecting switch, a grounding switch, etc., which are not shown, are also provided, and an insulating gas is filled. In addition, an operation mechanism 8 of an electric spring operating system for closing and opening the vacuum circuit breaker 4 is provided in the gantry 2.
Reference numerals 7a to 7c are crankcases provided below the poles 3a to 3c via the mounting plate 2a, and 11 is a breaking drive unit. The depth of this switchgear is L ₁ (3
120 mm) and L ₂ (3000 mm) at the bottom.

FIG. 7 is a perspective view showing a schematic structure of the operating mechanism 8, and 9 shows a closing drive section. The closing drive unit 9 is composed of a closing spring 10, a link mechanism 13, a closing damper 14, and a spring energy storage electric motor, a latch mechanism, etc., which are not shown. The shutoff drive unit 11 includes a shutoff spring 12 and arms 24a to.
24c, blocking dampers 25a to 25c, and a toggle mechanism (not shown). Reference numerals 20a to 20c denote operation portions of each phase, which are arranged side by side in the front-rear direction, and are connected to the connecting shaft 16a
-16c, link mechanisms 21a-21c, main shafts 22a-2
2c, cranks 23a to 23c, and the like.
The operation units 20a to 20c are connected to each other via levers 18a to 28c and connecting links 17a and 17b, the operation unit 20a is connected to the closing drive unit 9 via a lever 15, and the operation unit 20c is connected to the link mechanism 21c. It is connected to the shutoff drive unit 11 via a lever 19. Therefore, the closing drive unit 9 is provided in front of the U-phase operation unit 20a, and the shut-off drive unit 11 is provided mainly behind the W-phase operation unit 20c. The main shafts 22a to 22c are passed through the crankcases 7a to 7c and supported by bearings.

Next, the operation of the above configuration will be described. First,
At the time of closing, the closing spring 10 that has been stored expands forward and rotates the connecting shaft 16a in the clockwise direction via the link mechanism 13 and the lever 15. Connection shafts 16a-16
c is a connecting link 17a via levers 18a-18c,
They are connected by 17b, and the connecting shafts 16b and 16c also rotate as the connecting shaft 16a rotates. For this reason, the main shafts 22a to 22c rotate counterclockwise via the link mechanisms 21a to 21c, push up the insulating rods 26a to 26c upwards via the cranks 23a to 23c, and the pair of vacuum circuit breakers 4 for each phase. Throw in. The closing speed is limited by the closing damper 14, and the shutoff spring 12 is charged by the rotation of the lever 19.

Next, at the time of shutting off, the shut-off spring 12 that has been stored is extended forward, the main shaft 22c is rotated clockwise through the lever 19, and the link mechanism 2
The connecting shaft 16c is rotated counterclockwise via the 1c, and the main shafts 22a and 22b are also rotated clockwise via the connecting shafts 16a and 16b and the link mechanisms 21a and 21b. As a result, the insulating rods 26a to 26c are pulled down, and the vacuum circuit breaker 4 is shut off. The breaking speed is the breaking damper 25a.
Limited by ~ 25c.

[0006]

In the conventional gas-insulated reduction type switchgear described above, the driving force is transmitted in three steps in the order of U-phase, V-phase and W-phase in the case of the closing operation, and the insulating rod 26a. ~ 26c also moved later in the V and W phases than in the U phase. In the case of shut-off operation, the driving force is W phase, V phase, U
Transmission was made in three stages in the order of phases, and the V and U phases moved later than the W phase. Therefore, the closing and closing operations of the vacuum circuit breakers 4 of the respective phases are uneven, and if the unevenness is not adjusted within a predetermined range, an overvoltage may occur and a one-line ground fault may occur. Therefore, in order to adjust the alignment of the three phases within a predetermined range, it is necessary to adjust the lengths of the connecting links 17a and 17b and the link mechanisms 21a to 21c. And the adjustment at the time of the shutoff operation are in the opposite relationship, and it is necessary to make a very delicate adjustment.
It took a considerable amount of adjustment time.

Further, the closing drive unit 9 is arranged in the front of the U phase and the shut-off drive unit 11 is mainly arranged in the rear of the W phase, so that the depth dimension of the operating mechanism 8 becomes large and the operation mechanism 8 becomes large as a whole. It was

The present invention has been made in order to solve the above-mentioned problems, and it is possible to make the operating mechanism small and easy to adjust, and also to make it small overall. The purpose is to obtain a reduction type switchgear.

[0009]

A gas-insulated reduction type switchgear according to the present invention is provided with a closing drive section in front of or behind a central phase operation section of each phase operation section arranged in the front-rear direction. This closing drive unit is connected to the central phase operation unit.

[0010]

In the present invention, the closing drive unit is connected to the operation unit of the central phase, the closing drive force is transmitted from the operation unit of the central phase to the operation units of the front and rear end phases, and the operation delay of the end phase is eliminated. Less. Further, the closing drive section is provided in front of or behind the central phase operation section, and the depth of the operation mechanism is reduced.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view showing a schematic configuration of an operating mechanism of a gas-insulated reduction type switchgear according to this embodiment, FIG.
FIG. 3B is a vertical sectional front view and a vertical sectional side view of a main portion of the gas-insulated reduction type switchgear according to this embodiment.
FIG. 3 is a front view and a side view of the gas-insulated reduction type switchgear according to this embodiment. As shown in the figure, the closing drive unit 9 is provided in front of the V-phase operation unit 20b, and the closing drive unit 9 is connected to the connecting shaft 16b of the operation unit 20b via the lever 15.

In the above-mentioned structure, the closing spring 10 which has been energized at the time of closing is extended forward, the connecting shaft 16b is rotated clockwise through the link mechanism 13 and the lever 15, and the connecting shaft 16b is rotated by the lever. It is transmitted to the connecting shafts 16a to 16b via 18a to 18c and the connecting links 17a and 17b. Therefore, the main shafts 22a to 22c rotate counterclockwise via the link mechanisms 21a to 21c, and the crank 2
The insulating rods 26a to 26c are moved upwards via 3a to 23c, and the vacuum circuit breaker 4 of each phase is turned on. The interruption operation is the same as the conventional one.

4A and 4B are a front view and a side view of the closing drive unit 9 excluding the link mechanism 13, and the configuration of this part will be described together with the operation. When the closing command is given, the closing electromagnet 27 is attracted, and the closing hook 28 is rotated clockwise and the roller 2 provided at the tip of the lever 30.
9, the screw rod 32 and the operating rod 31 integral with the screw rod 32 are moved by the closing spring 10, and the closing operation of each phase is performed via the link mechanism 13. In this state, the limit switch 33 operates, the motor 34 rotates in the normal direction, and the reduction gear 3
5 and the spur gear 36 rotate. The spline nut 37 rotates with the spur gear 36 and is screwed into the screw rod 32, and slides rightward in the spline groove of the spur gear 36.

In this case, the lever 30 and the closing hook 28 are pulled by the return spring 38 and move following the spline nut 37, so that the roller 39 and the closing hook 28 are engaged.
At this time, the limit switch 33 is reversed by the closing hook 28, and the rotation of the motor 34 is stopped. After a few seconds in this state, the motor 34 reversely rotates, the gear 35 and the spur gear 36 rotate in principle, and the spline nut 37 also rotates. The lever 30 contacts the tip of the spline nut 37 via a thrust bearing, and the left movement of the spline nut 37 is restricted by the lever 30 and the closing hook 28. When the spline nut 37 rotates, the screw rod 32 moves rightward. And the closing spring 10 is compressed and stored. When this energy storage is performed up to a predetermined position, the limit switch 39 operates and the motor 34 stops. In addition, 40 is a spring receiving metal fitting, 41 is a guide of the operating rod 31, and 42 is a support.

In the above embodiment, the closing drive unit 9 is V
It is connected to the phase operation unit 20b, and the closing driving force is transmitted in two steps from the V phase to the U phase and the W phase, so that the operation delay is reduced and the adjustment during the closing operation is facilitated. The adjustment becomes easy, and the adjustment becomes easy as a whole. In addition, since the charged driving unit 9 is provided in front of the operating portion 20b of the V-phase, depth of operation mechanism 8 is reduced, also reduced the depth of the entire switchgear, for example, in the upper L ₁
(2710 mm) and L ₂ (2590 mm) at the bottom. In addition, the site area of the substation can be reduced. The closing drive unit 9 may be provided behind the V-phase operation unit 20b. Further, the shut-off drive unit 11 is replaced with the W-phase operation unit 20
Although it is connected to c, it may be connected to the operation parts 20a and 20b of other phases.

[0016]

As described above, according to the present invention, the closing drive unit is connected to the operation unit of the central phase among the operation units of each phase provided in the front-rear direction, and the closing drive force is from the central phase to the end. It is transmitted to the partial phase and the operation delay is reduced. Therefore, the adjustment of the operation mechanism becomes easy. Since the closing drive section is provided in front of or behind the central phase operation section, the depth of the operation mechanism can be reduced, and the opening / closing device as a whole can be reduced.

[Brief description of drawings]

FIG. 1 is a schematic configuration perspective view of an operating mechanism of a gas-insulated reduction type switchgear according to the present invention.

FIG. 2 is a vertical sectional front view and a vertical sectional side view of a main part of the device of the present invention.

FIG. 3 is a front view and a side view of the device of the present invention.

FIG. 4 is a front view and a side view of a closing drive unit (excluding a link mechanism) of the device of the present invention.

FIG. 5 is a front view and a side view of a conventional device.

FIG. 6 is a vertical sectional front view and a side sectional view of main parts of a conventional device.

FIG. 7 is a schematic perspective view of an operation mechanism of a conventional device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Tank 2 ... Stand 3 ... Pole pole 4 ... Vacuum circuit breaker 8 ... Operation mechanism 9 ... Closing drive part 11 ... Breaking drive part 15, 18a-18c ... Lever 16a-16c ... Connection shaft 17a, 17b ... Connection link 20a ... 20c ... operation part

Claims (1)

[Claims] 1. A tank is provided on a gantry, pole poles of each phase including a circuit breaker are arranged side by side in the front-rear direction in the tank, and operating parts of each phase circuit breaker are laid in the front-rear direction inside the gantry. In addition to connecting each phase operation part, and providing a closing drive part for connecting and disconnecting each phase circuit breaker by connecting to the central phase operation part in front of or behind the central phase operation part, A gas-insulated reduction type switchgear, characterized in that a shut-off drive unit for shutting off each phase circuit breaker is connected to the operation unit of the.