JP7221473B1 - gas insulated switchgear - Google Patents

Abstract

A gas-insulated switchgear having a disconnecting switch (41), the disconnecting switch (41) comprising a first stationary contact (112a) and a second stationary contact (112b), a movable contact (4f), and a movable contact. an insulating rod (4d) that switches between a first state in which (4f) is in contact with the first stationary contact (112a) and the second stationary contact (112b) and a second state in which it is out of contact; The tank (10) of the disconnecting switch (41) has a main pipe (4a) and branches from the main pipe (4a). a branch pipe portion (4b), the first fixed contact (112a) and the second fixed contact (112b) are housed in the main pipe portion (4a), and the surge suppression element (44) The movable contact (4f) is accommodated in the branch tube (4b) in the second state.

Description

The present disclosure relates to a gas insulated switchgear with a disconnecting switch housed in a grounded metal tank.

A gas-insulated switchgear contains equipment such as a circuit breaker, a disconnecting switch, an earthing switch, a busbar, a lightning arrester, an instrument transformer, and an instrument current transformer in a grounded metal tank. Adjacent devices are connected by connecting busbars. Insulating gas is filled in the tank of each device and the tank of the connecting bus applied to the gas-insulated switchgear.

A disconnecting switch for a gas insulated switchgear comprises a fixed contact installed at each end of a high voltage conductor divided into a power supply side and a load side, and a movable contact installed movably, and the movable contact is moved. Switching between the ON state and the OFF state is performed by switching the presence or absence of contact between the movable contact and the fixed contact. Disconnecting switches for gas-insulated switchgear include those that turn the contact on and off by bringing the movable contact into contact with the fixed contact through a linear sliding motion, and those that turn the blade-type movable contact to turn the contact. There is also a structure that implements turning on and off. In either construction, the movable contact is housed inside the high voltage conductor when in the off state.

For example, Patent Literature 1 discloses a gas-insulated switchgear in which a movable contact is accommodated in a bus-side electrode, which is a high-voltage conductor on the power supply side, in the OFF state by linear sliding motion.

JP 2014-99381 A

However, in the above-described prior art, the bus-side electrode must be longer than the movable contact in order to accommodate the movable contact in the disconnected state, resulting in a long tank of the disconnecting switch.

Furthermore, when the insulating gas in the tank is dry air, the required inter-electrode distance between the fixed contact on the power supply side and the fixed contact on the load side in the OFF state is greater than when the insulating gas is sulfur hexafluoride. is longer, the movable contact that connects the fixed contact on the power supply side and the fixed contact on the load side in the ON state must be lengthened. Longer movable contacts require longer high voltage conductors to house the movable contacts in the off state, thus making the tank of the disconnect switch even longer.

Attempts have been made to place the movable contact in a place other than the inside of the high-voltage conductor when in the OFF state. There was a problem that surge voltage occurred in

Thus, a gas-insulated switchgear that suppresses the surge voltage generated in the tank when the movable contact is grounded and that reduces the size of the tank of the disconnecting switch has not been realized.

The present disclosure has been made in view of the above, and aims to obtain a gas-insulated switchgear that suppresses the surge voltage generated in the tank when the movable contact is grounded and that reduces the size of the tank of the disconnector. aim.

In order to solve the above-described problems and achieve the object, a gas-insulated switchgear according to the present disclosure is a gas-insulated switchgear having a disconnector housed in a tank filled with insulating gas, wherein the disconnector is , a first high-voltage conductor and a second high-voltage conductor separately arranged on the power supply side and the load side, a first fixed contact installed at the end of the first high-voltage conductor, and a second between the first high voltage conductor and the second high voltage conductor by contacting the first stationary contact and the second stationary contact; a first state in which the movable contact is moved to contact the first fixed contact and the second fixed contact; and a first state in which the movable contact contacts the first fixed contact and the second fixed contact; and a surge suppression element that contacts the movable contact when in the second state. The disconnecting switch tank has a main pipe extending in the same direction as the first high voltage conductor and the second high voltage conductor, and a branch pipe branching off from the main pipe. The first high voltage conductor, the second high voltage conductor, the first stationary contact and the second stationary contact are housed in the main tube portion and the surge suppression element is housed in the branch tube portion. The insulating rod slides linearly along the axial direction of the branch pipe portion, and the movable contact is housed in the main pipe portion in the first state and is housed in the branch pipe portion in the second state.

Advantageous Effects of Invention According to the present disclosure, it is possible to obtain a gas-insulated switchgear that suppresses the surge voltage generated in the tank when the movable contact is grounded and that reduces the size of the tank of the disconnecting switch.

1 shows a configuration of a gas-insulated switchgear according to Embodiment 1. FIG. Sectional view of disconnecting switch of gas insulated switchgear according to Embodiment 1 Sectional view of disconnecting switch of gas insulated switchgear according to Embodiment 1 Sectional view of disconnecting switch of gas insulated switchgear according to Embodiment 1 Cross-sectional view of disconnector of gas-insulated switchgear according to Embodiment 2 Cross-sectional view of disconnector of gas-insulated switchgear according to Embodiment 2

Gas-insulated switchgear according to embodiments will be described in detail below with reference to the drawings.

Embodiment 1.
FIG. 1 is a diagram showing the configuration of a gas-insulated switchgear according to Embodiment 1. FIG. The gas-insulated switchgear 100 includes a circuit breaker 20 , earthing switches 31 and 32 , disconnecting switches 41 and 42 , an instrument transformer 62 , an instrument current transformer 61 , a bus 70 and a bushing 80 . The busbar 70 and the disconnecting switch 41 are connected by connecting busbars 91 and 92 . The bushing 80 and the disconnector 42 are connected by a connecting busbar 93 . Circuit breaker 20, grounding switches 31, 32, disconnecting switches 41, 42, instrument transformer 62, instrument current transformer 61, bus 70, bushing 80 and connecting bus 91, 92, 93 are grounded metal is housed in a tank of Insulating gas is contained in the tanks of circuit breaker 20, grounding switches 31, 32, disconnecting switches 41, 42, instrument transformer 62, instrument current transformer 61, bus 70, bushing 80, and connecting buses 91, 92, 93. is filled. When the gas-insulated switchgear 100 is used for power supply, it receives power from the busbar 70 and supplies power to the power cable through the bushing 80 . Further, when the gas-insulated switchgear 100 is used for receiving power, the power of the power system is drawn from the power cable through the bushing 80 and the power is supplied to the bus 70 .

In the following description, the gas-insulated switchgear 100 shall be used for power supply. Therefore, in the following description, circuit breaker 20, grounding switches 31 and 32, disconnecting switches 41 and 42, instrument transformer 62, instrument current transformer 61 and When describing the positional relationship of the connecting busbars 91, 92, and 93, the busbar 70 side is called the power supply side, and the bushing 80 side is called the load side.

2, 3 and 4 are cross-sectional views of the disconnector of the gas-insulated switchgear according to the first embodiment. The cross section shown in FIGS. 2 and 3 is a cross section parallel to the axial direction of the branch pipe portion 4b described later, and the cross section shown in FIG. 4 is a cross section perpendicular to the axial direction of the branch pipe portion 4b described later. 2 and 4 show cross sections of the disconnector 41 in the on state. 2 is taken along line II-II in FIG. 4, and the section shown in FIG. 4 is taken along line IV-IV in FIG. FIG. 3 shows a cross section of the disconnector 41 in the off state. Inside the tank 10 of the disconnecting switch 41, a first high voltage conductor 111a and a second high voltage conductor 111b are arranged separately for the power supply side and the load side. The tank 10 of the disconnector 41 includes a main pipe portion 4a and a branch pipe portion 4b. The main pipe portion 4a has a tubular shape extending in the longitudinal direction of the first high-voltage conductor 111a and the second high-voltage conductor 111b. The branch pipe portion 4b has a tubular shape that branches off from the main pipe portion 4a. Between the main pipe portion 4a and the tank 12 of the instrument current transformer 61, which is a device adjacent to the main pipe portion 4a, and between the main pipe portion 4a and the tank 11 of the connecting bus line 92, which is a connecting bus line adjacent to the main pipe portion 4a. is provided with an insulating spacer 121 . For this reason, the tank 10 of the disconnecting switch 41 is separated from the tank 12 of the instrument current transformer 61 or the tank 11 of the connecting bus 92 adjacent thereto in terms of gas.

The first high voltage conductor 111a and the second high voltage conductor 111b are coaxially arranged. A first fixed contact 112a is installed at the end of the first high voltage conductor 111a. A second fixed contact 112b is installed at the end of the second high voltage conductor 111b. A gap is formed between the first stationary contact 112a and the second stationary contact 112b.

The branch tube portion 4b has a tubular shape extending in a direction perpendicular to the longitudinal direction of the first high-voltage conductor 111a and the second high-voltage conductor 111b. The direction of the central axis of the main pipe portion 4a differs from the direction of the central axis of the branch pipe portion 4b by 90 degrees. The branch pipe portion 4b has an end surface 4c. An insulating rod 4d is installed in the branch pipe portion 4b. The insulating rod 4 d protrudes outside the tank 10 of the disconnecting switch 41 through the end surface 4 c and is connected to a link mechanism (not shown) of the disconnecting switch operating device 43 outside the tank 10 of the disconnecting switch 41 . A blade-type movable contact 4f is installed at the end of the insulating rod 4d of the disconnecting switch 41 disposed in the tank 10 . A surge suppression element 44 is installed in the branch pipe portion 4b. A surge suppression element 44 is fixed to the end face 4c of the branch pipe portion 4b. The surge suppression element 44 is, for example, a resistance element and an inductance element.

The disconnecting switch operating device 43 linearly slides the insulating rod 4d in the axial direction of the branch pipe portion 4b via a link mechanism (not shown). The insulating rod 4d moves the movable contact 4f to enter an on state, which is a first state in which the movable contact 4f contacts the first fixed contact 112a and the second fixed contact 112b, and a state in which the movable contact 4f is in the first state. Switching is made between the OFF state, which is the second state in which the stationary contact 112a and the second stationary contact 112b are not in contact with each other. That is, by linearly sliding the insulating rod 4d by the disconnecting switch operation device 43, the on state in which the movable contact 4f is inserted between the first fixed contact 112a and the second fixed contact 112b, and the first Switching is made between the off state in which the fixed contact 112a and the second fixed contact 112b are separated from the movable contact 4f. The movable contact 4f is housed in the main pipe portion 4a in the first state, and is housed in the branch pipe portion 4b in the second state.

As shown in FIG. 4, the first stationary contact 112a and the second stationary contact 112b are concave in a cross section perpendicular to the axial direction of the branch tube portion 4b. On the other hand, the movable contact 4f has an I shape in a cross section perpendicular to the axial direction of the branch tube portion 4b. By inserting the movable contact 4f into the recesses of the first fixed contact 112a and the second fixed contact 112b, an electric path is formed between the first high voltage conductor 111a and the second high voltage conductor 111b. be done.

As shown in FIG. 3, in the disconnected state, the movable contact 4f is accommodated in the branch tube portion 4b. The movable contact 4f accommodated in the branch pipe portion 4b is pressed against the surge suppressing element 44, and the residual charge of the movable contact 4f suppresses the surge voltage generated in the tank 10 by sharing the voltage with the surge suppressing element 44. discharges while

Although the internal structure of the disconnecting switch 41 has been described here, the internal structure of the disconnecting switch 42 is similar. That is, the tank 10 of the disconnecting switch 42 also includes a main pipe portion 4a and a branch pipe portion 4b. arranged coaxially. A first fixed contact 112a is installed at the end of the first high voltage conductor 111a. A second fixed contact 112b is installed at the end of the second high voltage conductor 111b. An insulating rod 4d is arranged in the branch pipe portion 4b, and a blade-shaped movable contact 4f is installed at the end of the insulating rod 4d. The movable contact 4f is inserted between the first fixed contact 112a and the second fixed contact 112b by the disconnecting switch operation device 43 linearly sliding the insulating rod 4d via a link mechanism (not shown). Switching is performed between the ON state and the OFF state in which the first fixed contact 112a and the second fixed contact 112b are separated from the movable contact 4f.

In the gas-insulated switchgear 100 according to Embodiment 1, it is not necessary to accommodate the movable contact 4f inside the first high-voltage conductor 111a or the second high-voltage conductor 111b when the disconnectors 41 and 42 are in the OFF state. , the first high-voltage conductor 111a and the second high-voltage conductor 111b can be shortened, and the tanks 10 of the disconnectors 41 and 42 can be miniaturized. Further, when the disconnecting switches 41 and 42 are in the OFF state, the movable contact 4f comes into contact with the surge suppression element 44 installed in the branch pipe portion 4b, thereby suppressing the surge voltage generated in the tank 10 when the movable contact 4f is grounded. can do.

Embodiment 2.
5 and 6 are cross-sectional views of a disconnector of a gas-insulated switchgear according to Embodiment 2. FIG. FIG. 5 shows a cross section of the disconnector 41 in the ON state. FIG. 6 shows a cross section of the disconnector 41 in the off state. In the disconnecting switches 41 and 42 of the gas-insulated switchgear 100 according to Embodiment 2, the direction of the central axis of the first high-voltage conductor 111a is different from the direction of the central axis of the second high-voltage conductor 111b by 90 degrees. The direction of the central axis of the branch tube portion 4b is the same as the direction of the central axis of the first high-voltage conductor 111a.

As in the gas-insulated switchgear 100 according to Embodiment 1, in the ON state, the movable contact 4f is inserted between the first fixed contact 112a and the second fixed contact 112b. accommodates the movable contact 4f. The movable contact 4f accommodated in the branch pipe portion 4b is pressed against the surge suppressing element 44, and the residual charge of the movable contact 4f suppresses the surge voltage generated in the tank 10 by sharing the voltage with the surge suppressing element 44. discharges while

Although the branch pipe portion 4b extends in the same direction as the central axis of the first high-voltage conductor 111a here, the branch pipe portion 4b extends in the same direction as the central axis of the second high-voltage conductor 111b. It may extend in any direction.

In the gas-insulated switchgear 100 according to Embodiment 2, the disconnecting switches 41 and 42 can be arranged at locations where the first high-voltage conductor 111a and the second high-voltage conductor 111b extend in different directions. Therefore, the degree of freedom in layout of the gas-insulated switchgear 100 is improved, and the installation space can be reduced.

The configuration shown in the above embodiment shows an example of the contents, and it is possible to combine it with another known technique, and part of the configuration is omitted or changed without departing from the scope. is also possible.

4a main pipe portion, 4b branch pipe portion, 4c end surface, 4d insulating rod, 4f movable contact, 10, 11, 12 tank, 20 circuit breaker, 31, 32 grounding switch, 41, 42 disconnector, 43 disconnector operating device, 44 surge suppression element, 61 instrument current transformer, 62 instrument transformer, 70 busbar, 80 bushing, 91, 92, 93 connecting busbar, 100 gas insulated switchgear, 111a first high voltage conductor, 111b second High voltage conductor, 112a first stationary contact, 112b second stationary contact, 121 insulating spacer.

Claims (4)

A gas insulated switchgear having a disconnector housed in a tank filled with insulating gas,
The disconnector is
a first high-voltage conductor and a second high-voltage conductor arranged separately on a power supply side and a load side;
a first stationary contact located at the end of the first high voltage conductor;
a second fixed contact located at the end of the second high voltage conductor;
a movable contact forming an electrical path between the first high voltage conductor and the second high voltage conductor by contacting the first stationary contact and the second stationary contact;
a first state in which the movable contact is moved to contact the first fixed contact and the second fixed contact; and a first state in which the movable contact contacts the first fixed contact and the second fixed contact. an insulating rod that switches between a second state in which the contact is out of contact;
a surge suppression element that contacts the movable contact when in the second state;
The tank of the disconnecting switch has a main pipe portion extending in the same direction as the direction in which the first high-voltage conductor and the second high-voltage conductor extend, and a branch pipe portion branching from the main pipe portion,
The first high-voltage conductor, the second high-voltage conductor, the first stationary contact, and the second stationary contact are accommodated in the main tube,
The surge suppression element is housed in the branch pipe,
The insulating rod linearly slides along the axial direction of the branch pipe portion, and the movable contact is housed in the main pipe portion in the first state and is housed in the branch pipe portion in the second state. A gas insulated switchgear characterized by: The first high-voltage conductor and the second high-voltage conductor are arranged coaxially, and the direction of the central axis of the main pipe differs from the direction of the central axis of the branch pipe by 90 degrees. The gas insulated switchgear according to claim 1, characterized by: The direction of the central axis of the first high voltage conductor and the direction of the central axis of the second high voltage conductor are different by 90 degrees,
2. The method according to claim 1, wherein the direction of the central axis of the branch tube portion is the same as the direction of the central axis of the first high-voltage conductor or the direction of the central axis of the second high-voltage conductor. Gas insulated switchgear as described. 4. The gas insulated switchgear according to any one of claims 1 to 3, wherein the surge suppression element is a resistance element and an inductance element.

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