JP3278495B2 - Gas insulated switchgear - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas insulated switchgear, and more particularly to a technique for improving a vibration isolating structure thereof.

[0002]

2. Description of the Related Art Gas-insulated switchgears are widely used in power systems because of their advantages of compactness and excellent insulation reliability, and further development is required. Such gas insulated switchgear, specifically, bus, circuit breaker, disconnector, ground switch, current transformer,
It is composed of devices such as a cable head and a power cable, and these devices are collectively installed on a basic base of a line installed on a floor slab.

In the gas insulated switchgear having the above configuration, the switchgears, ie, circuit breakers, disconnectors, and grounding switches, are operated at high speed by operating mechanisms using hydraulic, pneumatic, spring, etc. as driving sources. Therefore, generation of vibration during operation is inevitable. For this reason,
As an anti-vibration measure, a common base is installed on each line base of the gas insulated switchgear through a plurality of vertically expandable and contractable vibration isolators, and each line device is collectively mounted on this common base. 2. Description of the Related Art Vibration isolating structures are widely used which are installed and extend and contract a vibration isolator in a vertical direction to absorb an impact force during operation and prevent transmission of an impact force to a floor slab.

[0004]

In the conventional gas insulated switchgear as described above, since the common base is installed on the base base via the vibration isolator, the operation of the switchgear causes an impact. When power is generated,
The downward impact force can be sufficiently absorbed by the vibration isolator, but the upward impact force cannot be sufficiently absorbed by the vibration isolator. Therefore, there is a drawback in that the ability to absorb the impact force is unstable, and as a result, high vibration isolation performance cannot be obtained.

Further, in order to obtain the vibration isolation performance of the vibration isolator, that is, the effect of absorbing the impact force, it is necessary to minimize the spring constant in the direction perpendicular to the floor slab as much as possible. However, when the spring constant in the vertical direction is reduced in this way, the rigidity in the horizontal direction is also reduced. Therefore, when the vertical spring constant is reduced as much as possible to maintain high vibration isolation performance, the horizontal response of the gas insulated switchgear during an earthquake increases compared to when the vibration isolator is not applied. Resulting in. As a result, the bending stress of the power cable vertically pulled out from the cable head increases, the possibility of malfunction of the components increases, and the overall seismic performance of the device decreases. There are drawbacks.

The present invention has been proposed to solve the above-mentioned problems of the prior art, and an object of the present invention is to be able to stably and sufficiently absorb an impact force generated during the operation of a switchgear. Another object of the present invention is to provide a gas-insulated switchgear provided with an excellent vibration-proof structure capable of obtaining high vibration-proof performance.
In addition, by reducing the spring constant in the vertical direction as much as possible, maintaining high vibration isolation performance, and without increasing the horizontal response of the gas insulated switchgear, the overall seismic performance of the device is improved. Improving is also one of the objectives.

[0007]

SUMMARY OF THE INVENTION A gas insulated switchgear according to the present invention comprises a foundation base installed on a floor slab, a common base installed on the foundation base via a vibration isolator, and a common base installed on the common base. In a gas insulated switchgear provided with each line component device having a power cable installed collectively, the vibration isolators may include a plurality of first vibration isolators each of which is vertically expandable and contractable. A second vibration isolation device, wherein the plurality of first vibration isolation devices are installed between the base base and the common base, and wherein the plurality of second vibration isolation devices are The plurality of first vibration isolators and the plurality of second vibration isolators are installed at a position facing the first vibration isolator, and the plurality of first vibration isolators and the plurality of second vibration isolators have substantially the same spring constant in a vertical direction. Common A plurality of fixing members which are respectively installed at the ends of the respective side surfaces of the base so as to face the respective side surfaces and are supported and fixed on the floor slab, and which are installed between the common base and the fixing member; Vertical guide means for fixing a flat plate to the common base, fixing the other flat plate to the fixing member, and supporting the common base movably in a vertical direction with respect to the fixing member by these flat plates. It is characterized by having.

The operation of the gas insulated switchgear according to the present invention having the above-described structure is as follows. First, a plurality of first vibration isolators are provided between a base base and a common base opposed thereto, and a plurality of second vibration isolators are provided at positions of the common base facing the first vibration isolators. When the impact force is generated by the operation of the opening and closing device, the downward impact force can be sufficiently absorbed by the first vibration isolator, and the upward impact force can be absorbed by the second vibration device. It can be sufficiently absorbed by the insulating device. Therefore, the impact force generated during the operation of the switchgear can be stably and sufficiently absorbed, and high vibration isolation performance can be obtained.

In particular, according to the present invention, since the vertical spring constants of the first vibration isolator and the second vibration isolator are substantially equal, both the first and second vibration isolator are arranged in the vertical direction. Under the same conditions. Therefore, the impact force generated during the operation of the switchgear can be stably absorbed, and higher vibration isolation performance can be obtained.

On the other hand, when the vertical spring constants of the first and second vibration isolators are reduced as much as possible in order to improve the vibration isolation performance, the horizontal rigidity of these vibration isolators is also reduced. However, according to the present invention, by providing the fixing member and the vertical guide means on the outer periphery of the common base, the common base can be supported from the horizontal direction by the fixing member. Response can be suppressed. Therefore, the occurrence of bending stress in the power cable can be prevented, and the possibility of erroneous operation of the component devices can be reduced, so that the overall seismic performance of the device can be improved. In this case, since the common base is movably supported in the vertical direction with respect to the fixed member by the vertical guide means, the vertical direction of the common base accompanying the vertical expansion and contraction of the first and second vibration isolation devices is increased. Does not interfere with exercise.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the gas insulated switchgear according to the present invention will be described below in detail with reference to FIGS.
In this case, FIG. 1 is a partially enlarged sectional view showing a main part of an embodiment of the gas insulated switchgear according to the present invention, FIG. 2 is a vertical sectional view showing the whole gas insulated switchgear of FIG. 1, and FIG. It is a top view showing the whole gas insulated switchgear.

First, as shown in FIG. 1, a common base 4 is installed on a base base 2 installed on a floor slab 1 via a vibration isolator 3.
Each line component device 5 as shown in FIGS. 2 and 3 is collectively installed. In this case, the vibration isolator 3
, A second vibration isolating rubber (second vibration isolating device) 7, a coupling rod 8, and a nut 9.

That is, as shown in FIG. 1, a plurality of first anti-vibration rubbers 6 which can expand and contract in the vertical direction are provided between the upper surface of the top plate of the base 2 and the lower surface of the bottom plate of the common base 4. Similarly, a plurality of second anti-vibration rubbers 7 which can be expanded and contracted in the vertical direction are provided at positions on the bottom plate upper surface of the common base 4 which face the first anti-vibration rubbers 6. In this case, the first and second anti-vibration rubbers 6 and 7 are formed of the same material and have the same shape, and are configured so that their vertical spring constants are the same and sufficiently low. Further, the first and second vibration isolation rubbers 6 and 7 are arranged so as to completely overlap in the vertical direction. Then, in this state, the connecting rods 8 are inserted into the through holes provided at the corresponding positions of the top plate of the base 2, the first vibration isolating rubber 6, the bottom plate of the common base 4, and the second vibration isolating rubber 7. Are inserted, and both ends thereof are tightened by nuts 9, so that these members are integrally connected.

On the other hand, the common base 4 has a rectangular shape as shown in FIG. 3, and although not shown, the base base 2 also has the same shape as the common base 4 and is arranged so as to overlap. Have been. And common base 4
A fixed seat (fixed member) 10 is provided at a total of eight locations at two locations on the outer periphery of the four corner portions, and is supported and fixed on the floor slab 1. A slide bearing (vertical guide means) 11 is provided between the side plate of the common base 4 and the upper portion of the side plate of each fixed seat 10 facing the common base 4.
The common base 4 is formed by the slide bearing 11
It is movably supported in the vertical direction with respect to the fixed seat 10.
In addition, in the figure, 12 is a circuit breaker which is one of the switching devices of each line component device 5, 13 is a cable head, and 14 is pulled out vertically downward from the cable head 13 and is disposed underground. Power cable.

The operation of this embodiment having the above configuration is as follows. That is, first, the first vibration-proof rubber 6
And the spring constant in the vertical direction of the second vibration isolating rubber 7 is set sufficiently low, so that, for example, when the circuit breaker 12 generates an impact force F during its operation, The impact force F can be sufficiently absorbed by the first and second anti-vibration rubbers 6 and 7 being sufficiently expanded and contracted in the vertical direction. Therefore, the impact force generated during the operation of the switching device such as the circuit breaker 12 can be sufficiently absorbed, so that the transmission of the impact force to the floor slab 1 can be prevented, and high vibration isolation performance can be obtained.

In particular, in this embodiment, since the spring constant in the vertical direction of the first vibration isolating rubber 6 and the second vibration isolating rubber 7 is made equal, the first vibration isolating rubber 6 and the second Both of the vibration isolating rubbers 7 can be expanded and contracted in the vertical direction under the same conditions. Therefore, as compared with the case where only the first vibration isolating rubber 6 is provided as in the related art, the impact force generated during the operation of the switchgear such as the circuit breaker 12 can be stably absorbed, so that a higher force is achieved. Vibration isolation performance is obtained.

On the other hand, when the vertical spring constants of the first rubber 6 and the second rubber 7 are reduced as much as possible, as in this embodiment, these rubbers 6 and 7 can be used. However, in this embodiment, since the common base 4 can be supported from the horizontal direction by the fixed seat 10, the horizontal response of the gas insulated switchgear during an earthquake can be suppressed. . Therefore, in the present embodiment, the occurrence of bending stress in the power cable 14 can be prevented, and the possibility of malfunction of the component devices can be reduced, so that the seismic performance of the entire device as a whole can be improved. . Further, in this case, the common base 4 is supported by the slide bearing 11 so as to be movable in the vertical direction with respect to the fixed seat 10, so that the first and second anti-vibration rubbers 6 and 7 can expand and contract in the vertical direction. The accompanying vertical movement of the common base 4 is not hindered.

[0018]

As described above, in the present invention,
The first and second vibration isolators are provided as the vibration isolators, and the vibration force generated during the operation of the switchgear is reduced by improving the simple configuration in which the vertical spring constants of these vibration isolators are made substantially equal. It is possible to provide a gas-insulated switchgear that is stably and sufficiently absorbable and has an excellent vibration-proof structure capable of obtaining high vibration-proof performance. Also,
By providing the fixed member and the vertical guide means on the outer periphery of the common base, the spring constant in the vertical direction is reduced as much as possible, while maintaining high vibration isolation performance, and without increasing the horizontal response of the gas insulated switchgear. In addition, it is possible to improve the seismic performance in the overall sense of the entire device.

[Brief description of the drawings]

FIG. 1 is a partially enlarged sectional view showing a main part of an embodiment of a gas insulated switchgear according to the present invention.

FIG. 2 is a vertical sectional view showing the entire gas insulated switchgear of FIG. 1;

FIG. 3 is a plan view showing the entire gas insulated switchgear of FIG. 1;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Floor slab 2 ... Basic base 3 ... Vibration isolator 4 ... Common base 5 ... Each line component device 6 ... First vibration isolating rubber 7 ... Second vibration isolating rubber 8 ... Connecting rod 9 ... Nut 10 ... Fixed seat 11 ... Slide bearing 12 ... Circuit breaker 13 ... Cable head 14 ... Power cable

Continuation of the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) H02B 13/02 H02B 1/54 H02B 3/00 F16F 15/02 F16F 15/04-15/08

Claims (1)

(57) [Claims] 1. A foundation base installed on a floor slab;
In a gas insulated switchgear provided with a common base installed on a base base via a vibration isolator, and each circuit component having a power cable installed collectively on the common base, the vibration isolator is Has a plurality of first vibration isolation devices and a plurality of second vibration isolation devices, each of which can expand and contract in the vertical direction, wherein the plurality of first vibration isolation devices include the base base and the common base. The plurality of second vibration isolators are installed at positions on the common base facing the first vibration isolators, and the plurality of first vibration isolators and the plurality of second A plurality of vibration isolator devices, each having a substantially equal spring constant as a vertical spring constant, each of which is installed at an end of each side surface of the common base so as to face each side surface, and is supported and fixed on the floor slab. of A fixing member, installed between the common base and the fixing member, one flat plate is fixed to the common base, and the other flat plate is fixed to the fixing member. And a vertical guide means for movably supporting the fixing member in the vertical direction with respect to the fixing member.