WO2018109931A1

WO2018109931A1 - Gas-insulation switch device

Info

Publication number: WO2018109931A1
Application number: PCT/JP2016/087587
Authority: WO
Inventors: 和長金谷; 網田　芳明; 永田　寿一; 晃輔色見; 尚隆飯尾; 正将安藤
Original assignee: 株式会社東芝
Priority date: 2016-12-16
Filing date: 2016-12-16
Publication date: 2018-06-21
Also published as: JPWO2018109931A1; EP3561840A1; EP3561840A4; CN110088866B; CN110088866A; JP6823082B2

Abstract

Provided is a gas-insulation switch device wherein insulation performance is improved by efficiently eliminating residual hot gas, and capable of readily achieving the shut-off requirements demanded of a high-voltage switch. In this invention, formed inside a mobile shield 23 are a compression chamber 30 on a mobile contactor base 22 side and an aspiration chamber 31 on a mobile contactor 21 side with a piston 25a of an operating rod 25 serving as a partitioning wall. The compression chamber 30 blows dielectric gas through a communicating hole 25c, a hollow section 25b, and an aeration hole 21a, toward an arc 40 generated between a fixed arc contactor 11 and a mobile contactor 21 by the compression of the dielectric gas within the compression chamber due to the movement of the piston 25a when opening the poles. The aspiration chamber 31 draws in a high-temperature gas caused by the arc 40 from a gap 31a between the mobile contactor 21 and a mobile shield 23 by a reduction in pressure within the chamber due to the expansion of the space therein due to movement of the piston 25a.

Description

Gas insulated switchgear

Embodiments of the present invention relate to a gas insulated switchgear with improved insulation characteristics.

開閉 High voltage switchgears that are responsible for interrupting fault currents in the power system are required to reliably shut off from small to large currents. In particular, regarding the interruption of a large current, the following two interruption duties must be satisfied. One is responsible for interrupting short circuit line fault (SLF) current, and the other is responsible for interrupting breaker terminal short circuit fault (BTF) current. The SLF current is a current in which a triangular waveform voltage having a low absolute value but a steep change rate appears at the early rise of the transient recovery voltage generated immediately after the current zero point. The BTF current is a current to which a voltage having a high absolute value is applied at the end although the initial rise of the transient recovery voltage is gentle.

Conventionally, a switchgear of a system that achieves the above two interrupting duties with a single contact point has been widely adopted. However, if the two interrupting duties are achieved by a single contact portion, the weight of the movable portion of the contact portion increases, and the burden on the operating mechanism that drives the movable portion increases. Therefore, the method achieved with a single contact portion may be unsuitable for applications requiring extremely short interruption times.

In recent years, when it is desired to shorten the interruption time, it is required to reduce the load on the operation mechanism by reducing the weight of the movable part of the contact part. In view of this, a multi-point cut-off type switching device has been proposed in which a plurality of contact portions specialized for each interrupting duty are provided so as to fulfill the above two interrupting duties separately. In the multi-point cutting method, it is possible to achieve a plurality of types of interruption duties by electrically connecting different types of contact portions in series. As a contact part specialized in the interruption duty, for example, a vacuum interruption part or a gas contact part is known.

The vacuum interrupter is a contact that excels in interrupting characteristics with abrupt voltage changes, and interrupts accident currents. The gas contact portion is a contact portion having high insulation performance, and performs insulation after interruption. In the multi-point switching type switchgear having these two contact portions, each contact portion shares a different interrupting duty, so that the weight of the movable portion per each contact portion can be reduced. Therefore, the burden on the operating mechanism can be reduced, and the shut-off time can be shortened efficiently. Therefore, it can be said that the multi-point opening / closing device is also suitable for applications requiring extremely short interruption time.

Japanese Patent Laid-Open No. 2015-43656 WO2015 / 185095A1 JP-A-55-053824 JP-A-8-32233 Japanese Patent Laid-Open No. 2002-075148 JP 2008-112633 A Japanese Utility Model Publication No. 61-14444 JP 2014-72032 A JP2015-79635A Japanese Patent Laying-Open No. 2015-18581 Japanese Patent Application Laid-Open No. 2015-185467 USP 5,258,590 USP 5,258,590

In a multi-point switchgear switchgear, if a vacuum interrupting part that interrupts accident current and a gas contact part that insulates after interrupting are provided as contact parts that share the interrupting duty, the following problems occur: is there. That is, when the vacuum interrupter extinguishes the fault current, an arc is generated in the vacuum interrupter until the fault current is extinguished, but not only that, but also an arc is generated in the gas contact part.

Therefore, the insulating gas in the gas contact portion becomes a high-temperature hot gas by the generation of an arc. This hot gas stays in the gas contact portion for a long time after the arc disappears. As a result, the insulation performance of the gas contact portion may be reduced. In particular, if the amount of hot gas that remains is large, re-ignition may occur at the gas contact portion, and the interruption itself may end unsuccessfully.

The present embodiment has been proposed to solve the above-mentioned problems, and it effectively removes the staying hot gas to improve the insulation performance, and achieves the shut-off duty required for a high-voltage switchgear. An object is to provide a gas insulated switchgear that can be easily achieved.

In order to achieve the above object, an embodiment of the present invention includes a pressure vessel in which an insulating gas is sealed, a fixed contact base and a movable contact base that are disposed opposite to each other in the pressure vessel, and the fixed contact. A fixed arc contact fixed to the child base, a fixed shield fixed to the fixed contact base so as to surround the fixed arc contact, a fixed energizing contact disposed on the fixed shield, and the fixed energization A movable contact that is movably disposed facing the contact, a movable shield that is fixed to the movable contact base so as to surround the movable contact, and a piston that is connected to the movable contact and fixed. A gas-insulated switchgear comprising: an operating rod; and an operating mechanism for reciprocating the operating rod to bring the movable contact into and out of contact with the fixed arc contact and the fixed energizing contact. In includes the following components (1) to (6).

(1) Inside the movable shield, the piston of the operating rod is used as a partition, a compression chamber is formed on the movable contact base side, and a suction chamber is formed on the movable contact side.
(2) The operating rod is provided with a hollow portion and a communication hole that communicates the hollow portion and the compression chamber.
(3) The movable contact is provided with a vent hole penetrating from the end surface of the movable contact to the hollow portion of the operating rod.
(4) The compression chamber compresses the insulating gas in the chamber by the movement of the piston accompanying the movement of the operation rod during the opening operation, and through the communication hole, the hollow portion, and the vent hole, The insulating gas is sprayed on an arc generated between the fixed arc contact and the movable contact.
(5) A gap is provided between the outer peripheral portion of the movable contact and the inner peripheral portion of the movable shield.
(6) The high-temperature insulating gas heated by the arc by reducing the pressure in the chamber by expanding the space in the chamber due to the movement of the piston accompanying the movement of the operating rod during the opening operation. Is sucked into the room through the gap.

Sectional drawing which shows the closed circuit state of the gas insulated switchgear which concerns on 1st Embodiment. Sectional drawing which shows the open circuit state of the gas insulated switchgear which concerns on 1st Embodiment. Sectional drawing which shows the closed circuit state of the gas insulated switchgear concerning 2nd Embodiment. Sectional drawing which shows the open circuit state of the gas insulated switchgear which concerns on 2nd Embodiment. Sectional drawing which shows the closed circuit state of the gas insulated switchgear which concerns on 3rd Embodiment. Sectional drawing which shows the open circuit state of the gas insulated switchgear which concerns on 3rd Embodiment. Sectional drawing which shows the closed circuit state of the gas insulated switchgear which concerns on 4th Embodiment. Sectional drawing which shows the open circuit state of the gas insulated switchgear which concerns on 4th Embodiment.

Hereinafter, embodiments of the gas insulated switchgear according to the present invention will be described with reference to the drawings. In any of the gas insulated switchgears according to the following embodiments, a plurality of contact portions capable of sharing the interrupting duty are electrically connected in series, and are applied to the gas contact portions that are contact portions. is there.

[First Embodiment]
(Constitution)
The configuration of the first embodiment will be described with reference to FIGS. 1 and 2. FIG. 1 is a cross-sectional view showing a closed state according to the first embodiment, and FIG. 2 is a cross-sectional view showing an open state according to the first embodiment. As shown in FIGS. 1 and 2, the gas insulated switchgear 1 is provided with a pressure vessel 2 in which an insulating gas is sealed. A fixed contact portion 10 and a movable contact portion 20 are disposed inside the pressure vessel 2 so as to face each other.

The movable contact portion 20 has a movable shaft 3 extending toward the outside of the pressure vessel 2, and an operation mechanism 5 is connected to the movable shaft 3. The operation mechanism 5 is attached to the pressure vessel 2. The operating mechanism 5 is a mechanism that linearly reciprocates the movable contact portion 20 via the movable shaft 3 and separates the movable contact portion 20 from the fixed contact portion 10.

In the following description, an end portion where the fixed contact portion 10 and the movable contact portion 20 are relatively close to each other is referred to as a distal end portion of each

contact portion

10 and 20, and the opposite side is referred to as a proximal end portion. 1 and 2, in the movable contact portion 20, the right side of FIG. 1 is the base end side, and the opposite side is the tip end side. On the other hand, in the fixed contact portion 10, the right side in FIG. 1 is the distal end side, and the opposite side is the proximal end side. In addition, when a front-end | tip part is an end surface, it will also call a front end surface.

(Fixed contact part)
In the fixed contact portion 10, a fixed arc contact 11, a fixed energization contact 12, a fixed contact base 13, and a fixed shield 14 are arranged concentrically. A spring 16 is disposed inside the fixed shield 14.

The fixed contact base 13 is fixed to the pressure vessel 2. A rod-shaped fixed arc contact 11 is attached to the central portion of the fixed contact base 13. A cylindrical portion 13a that is thinner than the outer diameter of the base 13 protrudes from the distal end surface of the fixed contact base 13, and the fixed energizing contact 12 is disposed so as to surround the cylindrical portion 13a. .

A plurality of fixed energizing contacts 12 are arranged in the circumferential direction, and the tip is bent inward. The fixed energizing contact 12 is urged inward by the spring 16 and at the same time abuts against the outer peripheral portion of the cylindrical portion 13a of the fixed contact base 13 so that the inward movement by the spring 16 is restricted.

The fixed shield 14 is fixed to the outer peripheral surface of the fixed contact base 13 so as to surround the fixed energization contact 12. The distal end portion of the fixed shield 14 is bent inward so as to cover the distal end portion of the fixed energizing contact 12. A circular opening 14 a is formed at the tip of the fixed shield 14.

An arc-resistant metal 15 having arc resistance is fixed to the tip of the fixed arc contact 11. The arc-resistant metal 15 has a spindle shape that bulges outward. The fixed arc contact 11 is provided with a slit 17 whose front end is cracked in the longitudinal direction. A plurality of slits 17 are provided so as to be parallel to each other. Due to the presence of these slits 17, the fixed arc contact 11 has a spring property in which the tip portion is deformed in the radial direction.

(Movable contact part)
In the movable contact portion 20, a movable contact 21, a movable contact base 22, a movable shield 23, and an operation rod 25 are arranged concentrically. Among these, the operating rod 25 is connected to the movable contact 21 at the distal end and the movable shaft 3 to the proximal end. The operation rod 25 is a member that moves the movable contact 21 away from the fixed arc contact 11 and the fixed energization contact 12 when the movable shaft 3 reciprocates by the operation mechanism 5.

A disk-like piston 25a is fixed to the operation rod 25. The operating rod 25 is provided with a hollow portion 25b extending in the longitudinal direction at the center portion. Further, the operation rod 25 is provided with a communication hole 25 c that is orthogonal to the hollow portion 25 b and extends from the hollow portion 25 b to the outer peripheral portion of the operation rod 25. The communication hole 25c is a hole that communicates the hollow portion 25b with a compression chamber 30 described later.

The movable contact 21 is attached to the tip of the operation rod 25 and is movably disposed facing the longitudinal direction of the fixed energizing contact 12. The outer diameter of the movable contact 21 is smaller than the inner diameter of the opening 14 a of the fixed shield 14 so that the movable contact 21 can be inserted into the opening 14 a of the fixed shield 14. When the movable contact 21 is inserted into the opening 14 a of the fixed shield 14, the movable contact 21 is provided such that the outer peripheral portion is in contact with the inner peripheral portion of the fixed energizing contact 12.

An arc resistant metal 24 having arc resistance is fixed to the tip of the movable contact 21. The arc-resistant metal 24 is provided in a ring shape so that the arc-resistant metal 15 of the fixed arc contactor 11 contacts and separates from the inner peripheral portion. That is, in the movable contact portion 20, the operation rod 25 and the movable contact 21 are members that are movable during the opening operation and the closing operation. On the other hand, even in the movable contact portion 20, the movable contact base 22 is a member fixed to the pressure vessel 2, and the movable shield 23 is a member fixed to the movable contact base 22.

In the movable contact 21, a plurality of vent holes 21 a extending in the longitudinal direction of the movable contact 21 are provided on the base end side when viewed from the portion where the arc-resistant metal 15 is inserted. The ventilation hole 21 a is a hole that penetrates from the end surface of the movable contact 21 to the hollow portion 25 b of the operation rod 25. The opening on the tip end side of the vent hole 21 a is disposed so as to face the tip end portion of the arc-resistant metal 15 of the fixed arc contactor 11.

The movable contact base 22 is fixed to the pressure vessel 2. The movable contact base 22 is a hollow cylindrical member, and the inside communicates with the internal space 22 a of the pressure vessel 2. A thick flange portion 22 d is formed at the tip of the movable contact base 22. A corner portion of the end face of the flange portion 22d of the movable contact base 22 that faces the communication hole 25c of the operation rod 25 at the end of the opening operation is defined as a gas flow rate restriction portion 22e. The gas flow restricting portion 22e is provided at a predetermined interval so as to cover at least a part of the communication hole 25c at the end of the opening operation.

A holding hole 22c is opened at the center of the flange portion 22d of the movable contact base 22. An operation rod 25 is inserted into the holding hole 22c. A gap 33 is formed between the inner peripheral portion of the holding hole 22 c of the movable contact base 22 and the outer peripheral portion of the operating rod 25. This gap 33 is an interval when the gas flow rate limiting portion 22e of the movable contactor base 22 covers the communication hole 25c.

The current collecting contact 26 and the sliding packing 27 are disposed in the gap 33 so as to contact the inner peripheral portion of the movable contact base 22 and the outer peripheral portion of the operating rod 25. In the flange portion 22d of the movable contact base 22, the current collecting contact 26 is attached to the proximal end portion, and the sliding packing 27 is attached to the distal end portion. Since the sliding packing 27 is installed in the gap 33, the insulating gas compressed in the compression chamber 30 does not flow from the gap 33 toward the internal space 22 a side of the movable contact base 22. The sliding packing 27 is configured to close a part of the communication hole 25c of the operating rod 25 at the end of the opening operation.

The movable shield 23 is fixed to the outer peripheral portion of the flange portion 22d of the movable contact base 22, and a circular opening 23a is formed on the distal end surface so as to surround the outer peripheral portion of the movable contact 21. The outer diameter dimension of the movable contact 21 is formed smaller than the inner diameter dimension of the opening 23a. Therefore, a gap 31 a is provided between the outer peripheral portion of the movable contact 21 and the inner peripheral portion of the opening 23 a of the movable shield 23.

In the inner space of the movable shield 23, two spaces are formed by using the piston 25a of the operation rod 25 as a partition wall. One is a compression chamber 30 formed on the movable contact base 22 side, and the other is a suction chamber 31 formed on the movable contact 21 side. The inner diameter of the compression chamber 30 is set larger than the inner diameter of the suction chamber 31. A gap 34 is formed between the inner peripheral portion of the movable shield 23 and the outer peripheral portion of the piston 25a. A sliding packing 28 is disposed in the gap 34 so as to contact the inner peripheral portion of the movable shield 23 and the outer peripheral portion of the piston 25a.

The compression chamber 30 is a space surrounded by the piston 25 a of the operation rod 25, the outer periphery of the operation rod 25, the flange 22 d of the movable contact base 22, and the inner periphery of the movable shield 23. The compression chamber 30 compresses the insulating gas in the chamber by the movement of the piston 25a accompanying the movement of the operation rod 25 during the opening operation. The compression chamber 30 is interposed between the arc-resistant metal 15 on the fixed arc contactor 11 side and the arc-resistant metal 24 on the movable contactor 21 side via the communication hole 25c, the hollow portion 25b, and the plurality of vent holes 21a. A compressed insulating gas is blown against the generated arc 40 (shown in FIG. 2). Since the insulating gas in the compression chamber 30 is at a lower temperature than the hot gas, the insulating gas in the compression chamber 30 is referred to as a low temperature gas.

The suction chamber 31 is a space surrounded by the piston 25 a of the operation rod 25, the outer periphery of the operation rod 25, the outer periphery of the movable contact 21, and the inner periphery of the movable shield 23. The suction chamber 31 expands the indoor space by the movement of the piston 25a accompanying the movement of the operation rod 25 during the opening operation, thereby reducing the pressure in the chamber, and a high-temperature insulating gas heated by the arc 40 (hereinafter, This is a portion that sucks in the room through the gap 31a.

(Opening operation)
The opening operation of the first embodiment having the above configuration will be described from the closed state shown in FIG. 1 to the open state shown in FIG. First, in the closed state shown in FIG. 1, the movable contact 21 is in contact with the fixed arc contact 11 and the fixed energization contact 12 and is in an energized state.

In the closed state, the fixed energizing contact 12 is pressed against the outer peripheral portion of the movable contact 21 by the elastic force of the spring 16. In the closed state, the fixed arc contact 11 is deformed so as to be contracted in the radial direction by the plurality of slits 17, so that the arc-resistant metal 15 fixed to the tip of the fixed arc contact 11 is urged in the outer circumferential direction. And pressed against the inner periphery of the movable contact 21.

With the closed state as described above as an initial state, when the operation mechanism 5 is started by an opening command sent from the outside and the movable shaft 3 is driven to the right side of FIG. 1, the operation rod 25 and the movable contactor 21 are also moved to the right side. To drive. Therefore, the movable contact 21 is first separated from the fixed energized contact 12. At this time, since the fixed arc contact 11 is in contact with the movable contact 21, no arc 40 is generated between the movable contact 21 and the fixed energized contact 12.

Thereafter, when the opening operation proceeds and the movable contact 21 is separated from the fixed arc contact 11, the gap between the arc resistant metal 24 on the movable contact 21 side and the arc resistant metal 15 on the fixed arc contact 11 side is reached. Generates an arc 40 (shown in FIG. 2). Since the arc 40 is very hot, the surrounding insulating gas becomes a hot gas and stays between the fixed arc contact 11 and the movable contact 21.

When the opening operation further proceeds, the fault current is interrupted by another switch (not shown) connected in series to the gas insulated switch 1. Therefore, the arc 40 generated between the fixed arc contact 11 and the movable contact 21 disappears. However, even when the arc 40 disappears, the hot gas from the arc 40 still remains between the fixed arc contact 11 and the movable contact 21. Therefore, the insulation performance is reduced with respect to the transient recovery voltage after interruption.

Therefore, in the first embodiment, the following operation is performed in order to suppress a decrease in insulation performance. That is, during the opening operation, the piston 25a that is driven to the right side with the movement of the operation rod 25 compresses the low-temperature gas in the compression chamber 30. The low temperature gas compressed in the compression chamber 30 is blown between the fixed arc contact 11 and the movable contact 21 through the communication hole 25c, the hollow portion 25b, and the plurality of vent holes 21a in order.

In the opening operation, when the piston 25a is driven to the right side, the internal space of the suction chamber 31 is expanded, and the pressure of the insulating gas in the chamber is lower than the surroundings. At this time, the internal space of the suction chamber 31 and the space where the arc 40 is generated communicate with each other by a gap 31 a provided between the outer peripheral portion of the movable contact 21 and the inner peripheral portion of the opening 23 a of the movable shield 23. Therefore, the hot gas existing around the arc-resistant metal 24 and the movable contact 21 can be taken into the suction chamber 31 through the gap 31a.

At the end of the opening operation, the gas flow rate limiting portion 22e provided on the end surface of the flange portion 22d of the movable contact base 22 covers at least a part of the communication hole 25c of the operating rod 25, and the sliding packing 27 is connected to the communication hole. A part of 25c is closed (the state shown in FIG. 2). The opening operation ends when the state shown in FIG. 1 is changed to the state shown in FIG. At the end of the opening operation, the movable contact 21 is completely accommodated in the movable shield 23.

(Closed operation)
Next, the closing operation of the gas insulated switchgear 1 from the open state shown in FIG. 2 to the closed state shown in FIG. 1 will be described. First, in the open circuit state shown in FIG. 2, the movable contact 21 is separated from the fixed arc contact 11 and the fixed energization contact 12 and is in a non-energized state.

With the open circuit state as described above as an initial state, the operation mechanism 5 is started by a closing command sent from the outside, and when the movable shaft 3 is driven to the left in FIG. 2, the operation rod 25 and the movable contact 21 are moved to the left. The movable contact 21 is driven and closed with the fixed arc contact 11, and then closed with the fixed energization contact 12.

When the closing operation proceeds, the piston 25a is driven to the left in FIG. 2, so that the internal space of the compression chamber 30 is expanded and the pressure of the insulating gas is reduced from the surroundings. Therefore, the insulating gas around the fixed arc contact 11 is taken into the compression chamber 30 through the communication hole 25c, the hollow portion 25b, and the vent hole 21a.

Further, when the piston 25a is driven to the left in FIG. 2, the insulating gas inside the suction chamber 31 is compressed, and the insulating gas is ejected to the arc-resistant metal 24 side of the movable contactor 21 through the gap 31a. The closing operation is finished when the state shown in FIG. 2 is changed to the state shown in FIG. 1, and the movable contact 21 is brought into a closed state with the fixed arc contact 11 and the fixed energization contact 12.

(Action and effect)
(1) In the first embodiment, in the compression chamber 30, the insulating gas in the chamber is compressed by the movement of the piston 25a accompanying the movement of the operation rod 25 during the opening operation, and the communication hole 25c, the hollow portion 25b, and the plurality The low temperature gas is sprayed to the arc 40 through the vent hole 21a. At this time, the plurality of vent holes 21a face the portion where the arc-resistant metal 15 of the fixed arc contact 11 is inserted.

Therefore, the vent hole 21a can spray the low-temperature gas from the compression chamber 30 intensively and in large quantities against the hot gas generated by the arc 40. Therefore, the hot gas generated by the arc 40 can be efficiently cooled, and the staying hot gas is diffused in all directions from the space where the arc 40 is generated, and blown off between the fixed arc contact 11 and the movable contact 21. be able to.

In addition, in the first embodiment, since the insulating gas in the compression chamber 30 is compressed by the start of movement of the piston 25a, the low temperature gas can be blown toward the generation space of the arc 40 from the initial stage of the opening operation. Is possible. Therefore, the hot gas can be diffused quickly, which can contribute to the improvement of the insulation performance.

Simultaneously with the diffusion of the hot gas as described above, in the first embodiment, the hot gas from the arc 40 can be sucked by the suction chamber 31. Therefore, the hot gas can be efficiently removed from between the fixed arc contact 11 and the movable contact 21. At this time, the gap 31 a serving as a hot gas inflow path to the suction chamber 31 is located on the outer peripheral portion of the movable contact 21.

Therefore, the hot gas diffused along the outer peripheral portion of the movable contact 21 due to the spray of the low temperature gas can smoothly flow toward the gap 31a. Moreover, in the first embodiment, since the pressure in the suction chamber 31 is reduced by the start of movement of the piston 25a, the suction chamber 31 can quickly suck in the hot gas through the gap 31a from the initial stage of the opening operation. .

As described above, in the gas insulated switchgear 1 according to the first embodiment, in order to remove the hot gas from between the fixed arc contact 11 and the movable contact 21, the fixed arc contact 11 and the movable contact 21. There is no worry of re-igniting. Therefore, it is possible to obtain good insulation performance with respect to the transient recovery voltage after interruption. Therefore, the gas-insulated switchgear 1 can easily achieve the shut-off duty required for a high-voltage switchgear, thereby reducing the burden on the operation mechanism 5 and contributing to shortening the shut-off time. it can.

(2) In the first embodiment, at the end of the opening operation, the gas flow rate restricting portion 22e of the flange portion 22d of the movable contactor base 22 covers at least a part of the communication hole 25c of the operating rod 25. The cross-sectional area of the communication hole 25c communicating with the chamber 30 decreases. Therefore, immediately before the end of the opening operation, the flow rate of the low temperature gas flowing from the compression chamber 30 toward the vent hole 21a can be reduced, and the pressure in the compression chamber 30 increases.

As a result, the puffer reaction force acting in the direction opposite to the driving direction during the opening operation, that is, the left direction in FIG. 2, increases in the piston 25a, and the operation rod 25 and the movable contactor are just before the end of the opening operation. 21 can be braked. Thereby, the impact force generated at the end of the opening operation can be relaxed, and the operation reliability can be improved.

(3) In the first embodiment, the sliding packing 27 closes only a part of the communication hole 25c of the operating rod 25 at the end of the opening operation. That is, the communication hole 25 c is not completely sealed by the sliding packing 27. Therefore, as described in the previous stage, the amount of low temperature gas flowing out from the compression chamber 30 is reduced immediately before the end of the opening operation, but this is not reduced to zero, and the low temperature gas is compressed through the communication hole 25c. It pulls out from the chamber 30 to the vent hole 21a side.

As a result, immediately before the end of the opening operation, even if the pressure in the compression chamber 30 increases due to the reduction of the outflow amount of the low temperature gas, the compression chamber 30 does not excessively increase in pressure. For this reason, it is possible to prevent the piston 25a from going backward to the left in FIG. 2 due to the puffer reaction force at the end of the opening operation.

(4) In the first embodiment, immediately before the end of the closing operation, the internal space of the compression chamber 30 expands, and the pressure of the insulating gas decreases from the surroundings. On the other hand, in the suction chamber 31, the pressure rises from the surroundings, and a puffer reaction force acts on the piston 25a in the direction opposite to the driving direction during the closing operation, that is, in the right direction in FIG. Therefore, the operating rod 25 and the movable contact 21 can be reliably braked just before the closing operation is completed, and the impact force generated at the end of the closing operation can be reduced.

(5) In the first embodiment, the spring 16 presses the fixed energizing contact 12 against the outer peripheral portion of the movable contact 21. Therefore, the electrical resistance is reduced, and heat generation due to energization can be suppressed. Further, the fixed arc contact 11 is deformed so as to be contracted in the radial direction by the plurality of slits 17, thereby giving an elastic force in the outer peripheral direction, and pressing the fixed arc contact 11 against the inner peripheral portion of the movable contact 21. . Therefore, like the fixed energizing contact 12 side, there is an advantage that the electrical resistance is reduced and heat generation due to energization can be suppressed.

[Second Embodiment]
(Constitution)
The configuration of the second embodiment will be described with reference to FIGS. 3 and 4. FIG. 3 is a cross-sectional view showing a closed state of the second embodiment, and FIG. 4 is a cross-sectional view showing an open state of the second embodiment. In addition, the same code | symbol is attached | subjected to the part which is the same or similar to the form of 1st Embodiment, and the overlapping description is abbreviate | omitted.

In the second embodiment, the flange portion 22d of the movable contact base 22 has a plurality of first intake holes 22b. The first intake hole 22b is a hole for communicating the internal space 22a and the compression chamber 30 in the movable contact base 22 and sucking the insulating gas in the internal space 22a into the compression chamber 30 during a closing operation. .

A ring plate-like valve 32 is disposed inside the compression chamber 30. The valve 32 is fitted in a groove 32a formed in the inner peripheral portion of the movable shield 23, and the moving range is limited by contacting the end of the groove 32a. The groove 32a is a positioning portion of the valve 32 at the end of the closing operation. The valve 32 has a structure in which when the pressure in the compression chamber 30 becomes higher than the pressure in the internal space 22a, the first intake hole 22b is closed by the pressure difference.

(Opening operation)
The opening operation of the second embodiment having the above configuration will be described from the closed state shown in FIG. 3 to the open state shown in FIG. However, the description of the same points as the opening operation in the first embodiment will be omitted.

During the opening operation, the piston 25a is driven to the right side in FIG. 3 so that the pressure in the compression chamber 30 becomes higher than the pressure in the internal space 22a, and the valve 32 closes the first intake hole 22b (state in FIG. 4). ). Therefore, the insulating gas does not flow into the compression chamber 30 from the internal space 22a through the first intake hole 22b.

Accordingly, the low-temperature gas in the compression chamber 30 can be efficiently compressed by driving the piston 25a, and the compression chamber 30 in the compression arcade 30 is brought to the fixed arc contact 11 side through the communication hole 25c, the hollow portion 25b, and the vent hole 21a. Cold gas can be blown out strongly. Further, in the second embodiment, as in the first embodiment, the internal space of the suction chamber 31 is expanded and the pressure of the insulating gas is reduced from the surroundings, so that the insulating gas around the arc-resistant metal 24 is removed from the gap. The air is taken into the suction chamber 31 from 31a.

(Closed operation)
The closing operation of the second embodiment will be described from the open state shown in FIG. 4 to the closed state shown in FIG. However, the description of the same points as the closing operation in the first embodiment will be omitted.

During the closing operation, the piston 25a is driven to the left in FIG. 4 so that the pressure in the compression chamber 30 becomes lower than the pressure in the internal space 22a, and the valve 32 opens the first intake hole 22b. Therefore, the insulating gas in the internal space 22a flows into the compression chamber 30 through the first intake hole 22b, and the pressure drop due to the expansion of the internal space of the compression chamber 30 can be suppressed. Accordingly, the piston 25a does not become difficult to move in the closing operation direction (left direction in FIG. 4) as the pressure in the compression chamber 30 decreases. At the end of the closing operation, the valve 32 comes into contact with the end of the groove 32a, so that the valve 32 is positioned.

(Action and effect)
In the second embodiment, the same operations and effects as those of the first embodiment can be obtained, and further, there are the following unique operations and effects. In other words, during the closing operation, the valve 32 opens the first intake hole 22b, so that the insulating gas flows from the internal space 22a of the movable contactor base 22 into the compression chamber 30 through the first intake hole 22b. Flows in. Therefore, the pressure in the compression chamber 30 does not decrease, and the suppression force to the closing operation generated with respect to the piston 25a decreases.

Moreover, in the second embodiment, the internal space 22a of the movable contact base 22 is employed as a space for supplying the insulating gas into the compression chamber 30, so that the insulating gas flows into the compression chamber 30. Easy to secure the amount. Further, the flow rate of the insulating gas can be easily adjusted by changing the size of the first intake hole 22b. As a result, the closing operation can be performed with the minimum energy, and the interruption time can be further shortened by further reducing the burden on the operation mechanism 5.

[Third Embodiment]
(Constitution)
The configuration of the third embodiment will be described with reference to FIGS. 5 and 6. FIG. 5 is a cross-sectional view showing the closed state of the third embodiment, and FIG. 6 is a cross-sectional view showing the open state of the third embodiment. In addition, the same code | symbol is attached | subjected to the part which is the same or similar to the form of 1st Embodiment, and the overlapping description is abbreviate | omitted.

In the third embodiment, the piston 25a has a plurality of second intake holes 25d. The second intake hole 25d communicates the compression chamber 30 and the suction chamber 31, and is a hole for sucking an insulating gas into the compression chamber 30 during the closing operation, like the first intake hole 22b.

A ring plate-like valve 32 is disposed inside the compression chamber 30. The movement range of the valve 32 is limited by a retaining ring 32 b fixed to the outer peripheral portion of the operation rod 25. The retaining ring 32b is a positioning part of the valve 32 at the end of the closing operation. Further, the valve 32 has a structure that closes the second intake hole 25d by a pressure difference when the pressure in the compression chamber 30 becomes higher than the pressure in the suction chamber 31.

(Opening operation)
The opening operation of the third embodiment having the above configuration will be described from the closed state shown in FIG. 5 to the open state shown in FIG. However, the description of the same points as the opening operation in the first embodiment will be omitted.

During the opening operation, the piston 25a is driven to the right in FIG. 5 so that the pressure in the compression chamber 30 becomes higher than the pressure in the suction chamber 31, and the valve 32 closes the second intake hole 25d. Therefore, the insulating gas does not flow into the compression chamber 30 from the suction chamber 31 through the second intake hole 25d, and the insulating gas can be efficiently compressed in the compression chamber 30.

Therefore, the low temperature gas in the compression chamber 30 can be strongly ejected from the compression chamber 30 to the fixed arc contactor 11 side through the communication hole 25c, the hollow portion 25b, and the vent hole 21a. Further, in the third embodiment, as in the first and second embodiments, the inner space of the suction chamber 31 is expanded and the pressure of the insulating gas is decreased from the surroundings, so that the insulating properties around the arc-resistant metal 24 are increased. The gas is taken into the suction chamber 31 from the gap 31a.

(Closed operation)
The closing operation of the third embodiment will be described from the open state shown in FIG. 6 to the closed state shown in FIG. However, the description of the same points as the closing operation in the first embodiment will be omitted.

During the closing operation, the piston 25a is driven to the left in FIG. 6 so that the pressure in the compression chamber 30 becomes lower than the pressure in the suction chamber 31, and the valve 32 opens the second intake hole 25d. Therefore, the insulating gas in the suction chamber 31 flows into the compression chamber 30 through the second intake hole 25d, the insulating gas in the suction chamber 31 is reduced, and the insulating gas in the compression chamber 30 is increased.

Therefore, the pressure in the compression chamber 30 and the suction chamber 31 can be made uniform, and the pressure drop in the compression chamber 30 and the pressure increase in the suction chamber 31 can be suppressed at the same time. Thereby, the piston 25a does not become difficult to move in the closing operation direction (left direction in FIG. 6). At the end of the closing operation, the valve 32 comes into contact with the retaining ring 32b so that the valve 32 is positioned.

(Action and effect)
In the third embodiment, the same operation and effect as those of the first and second embodiments can be obtained. Furthermore, not only the pressure in the compression chamber 30 is reduced but also the suction chamber during the closing operation. This can also be suppressed with respect to the pressure increase of 31. For this reason, during the closing operation, the suppression force of the closing operation generated in the piston 25a can be surely reduced, and the closing operation can be performed with even smaller energy. Therefore, it is possible to further reduce the burden on the operation mechanism 5 and efficiently shorten the shut-off time.

[Fourth Embodiment]
(Constitution)
The configuration of the fourth embodiment will be described with reference to FIGS. FIG. 7 is a cross-sectional view showing the closed state of the fourth embodiment, and FIG. 8 is a cross-sectional view showing the open state of the fourth embodiment. In addition, the same code | symbol is attached | subjected to the part which is the same or similar to the form of 1st Embodiment, and the overlapping description is abbreviate | omitted.

4th Embodiment is a modification regarding the vent 21a of the movable contactor 21 shown to FIG. 1 and FIG. The vent hole 21 b is formed so as to increase the flow path cross-sectional area of the insulating gas from the portion connected to the hollow portion 25 b of the operation rod 25 toward the end face of the movable contact 21. That is, the vent hole 21b has a channel cross-sectional area that expands from the communicating portion with the hollow portion 25b toward the low temperature gas ejection portion. In the fourth embodiment, the number of vent holes 21b is one.

(Action and effect)
The fourth embodiment described above has the following unique actions and effects in addition to the actions and effects similar to those of the first embodiment. That is, also in the fourth embodiment, the low-temperature gas compressed in the compression chamber 30 during the opening operation is ejected from the vent hole 21a through the communication hole 25c and the hollow portion 25b.

At this time, the vent hole 21b has a channel cross-sectional area that increases from the communicating portion with the hollow portion 25b to the ejection portion to the fixed arc contactor 11. For this reason, the flow velocity of the low-temperature gas passing through the vent hole 21b is increased when it is ejected with respect to the hot gas. Therefore, it becomes possible to cool and blow off hot gas more efficiently. As a result, better insulation performance can be obtained with respect to the transient recovery voltage after interruption.

[Other Embodiments]
Although several embodiments of the present invention have been described, these embodiments are presented by way of example and are not intended to limit the scope of the invention. These embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the spirit of the invention. These embodiments and their modifications are included in the scope and gist of the invention, and are also included in the invention described in the claims and the equivalents thereof.

For example, the shape and size of the gap 31 a formed along the outer peripheral portion of the movable contact 21, the shape and size of the movable contact 21, the number, shape, size, and operation of the air holes 21 a formed in the movable contact 21 The number, shape, dimensions, and the like of the hollow portion 25b and the communication hole 25c formed in the rod 25 can be selected as appropriate, and by easily adjusting the outflow amount of the low temperature gas that is ejected toward the generation space of the arc 40, It is possible to efficiently diffuse and cool the hot gas by the arc 40. Further, the size of the area of the end surface of the movable contact base 22 and the sliding packing 27 that covers the communication hole 25c at the end of the opening operation is within a range in which the operation rod 25 and the movable contact 21 can be braked. It can be changed as appropriate.

DESCRIPTION OF SYMBOLS 1 ... Gas insulation switchgear 2 ... Pressure vessel 3 ... Movable shaft 5 ... Operation mechanism 10 ... Fixed contact part 11 ... Fixed arc contact 12 ... Fixed electricity supply contact 13 ... Fixed part 13a ... Cylindrical part 14 ...

Fixed shield

14a, 23a ...

Openings

15, 24 ... Arc resistant metal 17 ... Slit 20 ... Movable contact part 21 ... Movable contactors 21a, 21b ... Vent hole 22 ... Movable contactor base 22a ... Internal space 22b ... First intake hole 22c ... Holding hole 22d ... Flange 22e ... Gas flow restriction 23 ... Movable shield 25 ... Operating rod 25a ... Piston 25b ... Hollow portion 25c ... Communication hole 25d ... Second intake hole 26 ...

Current collecting contacts

27, 28 ... Sliding Packing 30 ... Compression chamber 31 ...

Suction chambers

31a, 33, 34 ... Gap 32 ... Valve 32a ... Groove 32b ... Retaining ring 40 ... Arc

Claims

A pressure vessel sealed with an insulating gas;
A stationary contact base and a movable contact base disposed opposite to each other in the pressure vessel;
A fixed arc contact fixed to the fixed contact base;
A fixed shield fixed to the fixed contact base so as to surround the fixed arc contact;
A fixed energizing contact disposed on the fixed shield;
A movable contact that is movably disposed facing the fixed energized contact;
A movable shield fixed to the movable contact base so as to surround the movable contact;
An operating rod connected to the movable contact and fixed with a piston;
In a gas insulated switchgear comprising: an operating mechanism for reciprocating the operating rod to separate the movable contact from the fixed arc contact and the fixed energized contact;
Inside the movable shield, the piston of the operation rod is used as a partition, a compression chamber is formed on the movable contact base side, and a suction chamber is formed on the movable contact side, respectively.
The operating rod is provided with a hollow portion and a communication hole that communicates the hollow portion and the compression chamber.
The movable contact is provided with a vent hole penetrating from the end surface of the movable contact to the hollow portion of the operation rod,
The compression chamber compresses the insulating gas in the chamber by the movement of the piston accompanying the movement of the operation rod during the opening operation, and the fixed arc is passed through the communication hole, the hollow portion, and the vent hole. Spraying the insulating gas on an arc generated between the contact and the movable contact;
A gap is provided between the outer peripheral part of the movable contact and the inner peripheral part of the movable shield,
The suction chamber expands the indoor space by the movement of the piston accompanying the movement of the operating rod during the opening operation, thereby reducing the pressure inside the chamber and causing the high-temperature insulating gas heated by the arc to pass through the gap. A gas insulated switchgear characterized by being sucked into a room from the inside.
Formed on the end face of the movable contactor base facing the compression chamber is a first intake hole for sucking the insulating gas into the compression chamber during a closing operation,
2. The gas insulated switchgear according to claim 1, wherein the first intake hole is provided with a valve that closes the intake hole during the opening operation and opens the intake hole during the closing operation.
The piston communicates with the suction chamber and the compression chamber, and forms a second intake hole for sucking the insulating gas in the suction chamber into the compression chamber during a closing operation,
The gas-insulated switchgear according to claim 1 or 2, wherein a valve that closes the intake hole during an opening operation and opens the intake hole during a closing operation is attached to the second intake hole. .
The gas insulated switchgear according to claim 2 or 3, wherein the valve is disposed in the compression chamber.
5. The gas insulated switchgear according to any one of claims 2 to 4, further comprising a valve positioning portion for positioning the valve at the end of the closing operation.
The said air hole is formed so that the flow-path cross-sectional area of the said insulating gas may be expanded toward the end surface of the said movable contact from the part connected with the said hollow part of the said operating rod. 6. A gas insulated switchgear according to any one of 1 to 5.
The gas insulated switchgear according to any one of claims 1 to 6, wherein a plurality of the vent holes are arranged.
The gas insulated switchgear according to any one of claims 1 to 7, wherein at least one of the fixed arc contact and the fixed energization contact is biased toward the movable contact.
The gas according to any one of claims 1 to 7, wherein a gas flow rate restricting portion is provided on an end face of the movable contact base to cover at least a part of the communication hole at the end of the opening operation. Insulated switchgear.
A sliding packing is arranged so as to be in contact with the inner peripheral part of the movable contact base and the outer peripheral part of the operation rod,
The gas-insulated switchgear according to any one of claims 1 to 9, wherein the sliding packing is configured to close a part of the communication hole of the operation rod at the end of the opening operation.