JPH07312149A - Gas disconnector - Google Patents

Abstract

(57) [Abstract] [Purpose] The re-ignition arc reliably reaches the resistance contact from the movable contact by reducing the probability that the re-ignition arc generated from the movable contact flashes to the fixed contact. Thus, a highly reliable gas disconnector is provided in which the resistance contact and the fixed side contact portion are energized through the resistor, and the voltage level of the disconnector surge generated during re-ignition can be reduced. [Structure] The diameter of the opening 20 of the resistance contact 19 is D1, and between the poles of the gas disconnector (between the movable side contact portion 2 and the resistance contact 19).
The inter-electrode length, which is the length dimension of L, and the opening 2 of the resistance contact 19
When the thickness of the opening 20 of the movable contactor 4 in the axial direction is 1 at 0, the ratio D1 / of the opening diameter D1 and the gap length L is D1 /
L is 67%, the ratio of the opening thickness 1 to the opening diameter D1 is 1 /
D1 is configured to be 40%.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas disconnector equipped with a resistor for reducing the voltage level of a surge generated during re-ignition, and more particularly to a movable contactor and a resistor for opening and closing. The present invention relates to a gas disconnector in which the shape of the tip of a movable contactor and the shape of a resistance contact are improved in order to improve the direction in which a re-ignition arc is generated between the contact and the contact.

[0002]

2. Description of the Related Art Generally, in a gas-insulated switchgear,
In an airtight container filled with SF ₆ gas of about 3 to 6 atm,
It contains equipment required for opening and closing operations such as gas circuit breakers, gas disconnectors, grounding switches, current transformers, and instrument transformers.
Among them, the gas disconnector is normally opened and closed with the gas circuit breaker open.

By the way, it is known that when the gas disconnector is opened and closed, a steep wave surge called disconnector surge occurs in the gas disconnector. Since this disconnector surge propagates into the gas-insulated switchgear, if the gas-insulated switchgear is of UHV class, it may threaten the insulation of the device. Therefore, conventionally, a gas disconnector with a resistor has been proposed for the purpose of suppressing the voltage level of the disconnector surge. Here, a conventional example of such a gas disconnecting switch with a resistor will be specifically described with reference to FIGS. 9 and 10. 9 is an overall configuration diagram of a conventional example of a gas disconnector, and FIG. 10 is a principle diagram of the gas disconnector shown in FIG.

In the figure, 1 is SF _{6 of} about 3 to 6 atm.
It is a closed container filled with gas. This closed container 1
The movable side contact portion 2 and the fixed side contact portion 3 are arranged to face each other. Of these, a movable contact 4 is provided on the movable contact portion 2 so as to linearly slide. The movable contactor 4 slides between the movable side contact part 2 and the fixed side contact part 3 to open and close the electric circuit.

Next, the overall structure of the gas disconnector will be described with reference to FIG. That is, the movable contact portion 2 is attached to the closed container 1 via the insulating tube 5, and the fixed contact portion 3 is attached to the closed container 1 via the insulating tube 6. An operation mechanism 7 and an opening / closing mechanism 8 are fixed to the upper part of the closed container 1. An insulating operation rod 9 is connected to the opening / closing mechanism 8, and the movable contactor 4 is fixed to the tip of the insulating operation rod 9. The driving force of the operating mechanism 7 is converted from a rotary motion to a linear motion by the opening / closing mechanism 8, and the converted driving force is transmitted through the insulating operation rod 9 to linearly drive the movable contactor 4. .

Fingers 11 that contact the conductor 10 and the movable contact 4 are provided in the movable contact portion 2, and the conductor 10 is pulled out to the outside via an insulating spacer 12. Further, the fixed side contact portion 3 is provided with a finger 14 that contacts the conductor 13 and the movable contactor 4, and the conductor 13 is drawn out through the insulating spacer 12.

Further, a resistor shield device 15 is arranged around the fixed side contact portion 3. The resistor shield device 15 includes a pair of resistor shields 16 and 17 which are vertically separated from each other, and these two resistor shields 1.
It is composed of a plurality of resistors 18 connecting 6 and 17. The resistor shield 16 is electrically connected to the fixed side contact portion 3 via the resistor 18 and the resistor shield 17. The upper end of the resistor 18 is fixed to the inner surface of the upper resistor shield 16, and the lower end of the resistor 18 is fixed to the inner surface of the lower resistor shield 17. The resistance value of the resistor 18 is set sufficiently large.

The movable contactor 4 in the resistor shield 16
A resistance contact 19 is arranged at an end portion close to the. The resistance contact 19 has an opening 2 through which the movable contact 4 can pass.
0 is formed. In addition, the movable contact portion 2 and the resistance contact 1
The gap of 9 forms the gap between the gas disconnectors. The length dimension between the poles is determined by the voltage magnitude of the gas disconnector.

When the gas disconnecting switch having the above-mentioned structure is opened and closed, a re-ignition arc 21 is generated between the movable contact 4 and the resistance contact 19 (see FIG. 10). The re-ignition arc 21 is generated a plurality of times up to a predetermined position where the movable contactor 4 and the resistance setting 19 are restored to insulation, and the resistance contact 19 and the movable contactor 4 are flashed over during the opening / closing operation. As a result, electricity is supplied through the arc 21. At this time, the resistor 18 electrically mediates between the resistance contact 19 and the fixed-side contact portion 3, so that the resistance contact 19 and the fixed-side contact portion 3 are energized through the resistor 18. Therefore, the resistor 18 can suppress the voltage level of the disconnector surge to a low level.

As described above, in the gas disconnector provided with the resistor 18, the re-ignition arc 21 is moved from the movable contact 4 in order to reduce the voltage level of the disconnector surge generated during re-ignition. It is an important action that the resistor 18 reaches the resistance contact 19 and electrically mediates between the resistance contact 19 and the fixed side contact portion 3.

[0011]

However, when the re-ignition arc 21 is generated between the movable contact 4 and the resistance contact 19, as shown in FIG. 11, the re-ignition arc 21 branches off midway. A phenomenon may occur, and the branched arc 22 does not reach the resistance contact 19 from the movable contactor 4, but may reach the fixed side contact portion 3 through the opening 20 of the resistance contact 19. When the arc 22 flashes on the fixed side contact portion 3, the movable side contactor 4 causes a flashover with the fixed side contact portion 3. Therefore, the movable contact 4
The fixed-side contact portion 3 and the fixed-side contact portion 3 are electrically connected to each other by the branched arc 22 without interposing the resistor 18 therebetween.
A disconnector surge occurs in a state in which it does not play its role. As a result, the movable contact 4, the fixed contact portion 3, and the closed container 1 may cause dielectric breakdown.

The present invention has been proposed in order to solve the above problems, and its main purpose is to cause a re-ignition arc generated from a movable contactor and branched into a flash to a fixed side contact portion. By reducing the probability of entanglement, the re-ignition arc surely reaches the resistance contact from the movable contact and the resistance contact and the fixed side contact part are energized through the resistor, and the disconnector surge that occurs during re-ignition It is to provide a highly reliable gas disconnector capable of reducing the voltage level of

More specifically, the invention of claim 1 aims to reduce the probability that the branched re-ignition arc will be flashed to the fixed side contact portion by reducing the opening diameter of the resistance contact. .

A second object of the present invention is to increase the thickness of the opening portion of the resistance contact to reduce the probability that the branched re-ignition arc will be flashed to the fixed side contact portion.

A third aspect of the present invention has the object of directing the re-ignition arc generation direction only to the resistance contact side by the action of the insulating layer provided at the end of the movable contact.

An object of the invention of claim 4 is that a re-ignition arc branched by a closing member provided on the resistor shield closing the opening of the resistance contact passes through the opening to reach the fixed side contact portion. It is to prevent the arrival completely.

According to the fifth and sixth aspects of the invention, the re-ignition arc is generated by changing the electric field value at the tip of the movable contact between the central portion facing the fixed side contact portion and the peripheral portion close to the resistance contact. The purpose is to direct the direction to the resistance contact side only.

[0018]

According to the present invention for achieving the above object, a fixed-side contact portion and a movable-side contact portion face each other in a closed container filled with an insulating and arc-extinguishing gas. A movable contactor is disposed in the movable contact portion so as to be able to come into contact with and separate from the fixed contact portion, and is slidable with respect to the movable contact portion, and a resistor is provided around the fixed contact portion. A resistor shield is disposed at an end of the resistor facing the movable contact portion, and a resistor contact having an opening through which the movable contact can penetrate is disposed on the resistor shield. A gas disconnecting switch provided between the movable side contact portion and the resistance contact so that the gap between the electrodes is provided, and has the following structural features.

That is, in the invention of claim 1, when the diameter of the opening of the resistance contact is D1 and the inter-electrode length which is the length dimension between the poles is L, the opening diameter D1 and the inter-electrode length L are Ratio of D1 /
It is characterized in that L is configured to be 20% or more and 67% or less.

According to a second aspect of the present invention, when the thickness of the opening in the axial direction of the movable contact is 1 in the opening of the resistance contact, the ratio of this opening thickness 1 to the opening diameter D1. l
/ D1 is configured to be 40% or more and 100% or less.

Further, the invention of claim 3 is characterized in that an insulating layer is formed at an end portion of the movable contact facing the fixed side contact portion.

According to a fourth aspect of the invention, the resistor shield is provided with a closing member for closing the movable contact after passing through the opening of the resistance contact. is there.

According to a fifth aspect of the invention, at the tip of the movable contact, a first region having a low voltage value is formed in the central portion facing the fixed side contact portion, and a high area is formed in the peripheral portion close to the resistance contact. A second region having a voltage value is formed.

According to a sixth aspect of the invention, in the gas disconnector according to the fifth aspect, when the electric field value of the first region is X and the electric field value of the second region is Y, the ratio X of the two electric field values is X. / Y
Is configured to be 95% or less.

[0025]

The operation of the present invention having the above construction is as follows. That is, in the invention of claim 1, since the opening diameter D1 of the resistance contact is 67% or less of the inter-electrode length L, the resistance contact is compared with the inter-electrode length dimension that determines the magnitude of the voltage of the gas disconnector. The diameter of the opening can be set small. Therefore, even if the re-ignition arc generated between the movable contact and the resistance contact is branched, it is difficult for the branched arc to pass through the opening because the diameter of the opening is small. As a result, it is possible to reduce the probability that the arc will be flashed to the fixed side contact portion to a level where there is no problem in actual operation. In addition, since the opening diameter D1 of the resistance contact is set to 20% or more of the inter-electrode length L, the problem that the diameter of the movable contact, which becomes thin corresponding to the opening diameter D1, becomes too small does not occur.

By the way, when the electric field distribution between the resistance contact and the fixed side contact portion when the movable contact and the resistance contact are energized by the re-ignition arc is examined, when the opening thickness of the resistance contact is thin, When compared with the case where the resistance contact has a thick opening, the latter has a narrower interval between equipotential lines. In other words, a gas disconnector having a resistance contact with a thick opening has a steeper equipotential line between the resistance contact and the fixed side contact portion, and compared with a gas disconnector having a resistance contact with a thin opening. ,
It can be said that the branched re-ignition arc is less likely to enter the resistive contact opening.

According to the second aspect of the invention, since the opening thickness l of the resistance contact is set to 40% or more of the opening diameter D1 of the resistance contact, it is considerably thicker than the normal resistance contact opening thickness. Becomes Therefore, it is less likely that a branched re-ignition arc will enter the opening of the resistance contact, and the probability of the arc flashing to the fixed side contact part side is, in actual operation,
It is possible to reduce it to a level without problems. In addition,
Since the opening thickness l of the resistance contact is 100% or less of the opening diameter D1 of the resistance contact, the opening diameter D of the resistance contact is
It is possible to avoid increasing the size of the gas disconnector due to the increase in the wall thickness of 1.

According to the third aspect of the present invention, since the insulating layer is formed at the end portion of the movable contact facing the fixed side contact portion, the re-ignition arc generation position between the movable contact and the resistance contact is generated. Is outside the opening of the resistance contact. Therefore,
The flashover to the fixed side contact portion of the re-ignition arc can be greatly reduced.

In the invention of claim 4, since the closing member closes the opening of the resistance contact after the movable contact separates from the opening of the resistance contact, re-occurrence between the movable contact and the resistance contact occurs. Even if the ignition arc is branched, the branched arc does not flash through the opening of the resistance contact to the fixed side contact portion. Therefore, the re-ignition arc can only occur between the moving contact and the resistive contact.

In the invention of claim 5, the re-ignition arc is generated from the second region having a high voltage value at the tip of the movable contact, that is, the peripheral portion close to the resistance contact. This re-ignition arc generation position is outside the opening of the resistance contact. Therefore, the flashover to the fixed side contact portion of the re-ignition arc can be greatly reduced.

Particularly, in the invention of claim 6, the ratio X / of the electric field values of the first region and the second region at the tip of the movable contactor is X /.
Since Y is 95%, the re-ignition arc originates from the second region. Therefore, the occurrence position of the re-ignition arc is surely outside the opening of the resistance contact.

[0032]

Embodiments of the present invention will be specifically described below with reference to the drawings. The basic configuration of the following embodiments is the same as that of the conventional gas disconnector shown in FIG. 9, and the same members are designated by the same reference numerals and the description thereof is omitted.

First Embodiment [Structure of First Embodiment] A first embodiment corresponding to the inventions of claims 1 and 2 will be described with reference to FIGS. In the first embodiment, the diameter of the opening 20 of the resistance contact 19 is D1, and between the poles of the gas disconnector (between the movable side contact portion 2 and the resistance contact 19).
The inter-electrode length, which is the length dimension of L, and the opening 2 of the resistance contact 19
At 0, the thickness of the opening 20 of the movable contactor 4 in the axial direction is set to 1. At this time, the ratio D1 / L between the opening diameter D1 and the gap length L is 67%, and the ratio 1 / D1 between the opening thickness l and the opening diameter D1 is 40%.

[Operation and Effect of First Embodiment] The operation of the first embodiment having the above-mentioned structure is as follows. That is, the opening diameter D1 of the resistance contact 20 is 6 with respect to the gap length L.
Since it was set to 7%, the opening diameter D1 was set between the electrodes of the gas disconnector.
Can be set small. Here, with reference to the graph of FIG. 2, a relationship between the ratio D1 / L of the opening diameter D1 and the gap length L and the probability that the restriking arc 21 flashes to the fixed side contact portion 3 will be shown. The flashover probability in this graph is based on experimental values. As shown in the graph, the ratio D1 / L is set to 6
When set to 7%, the probability of flashover to the fixed-side contact portion 3 is 0.1.
The probability is 3%, which is a so-called normal distribution of 3σ, and can be set to a probability that can be considered to hardly occur in actual operation.

As already mentioned, when the movable contact 4 and the resistance contact 19 are energized by the re-ignition arc 21, the opening 20 of the resistance contact 19 is thicker than it is thin. Also, the interval of equipotential lines between the resistance contact 19 and the fixed side contact portion 3 becomes narrow. This will be specifically described with reference to the drawings. FIG. 3 is a diagram showing equipotential lines in the interelectrode portion of the conventional gas disconnecting switch in which the thickness of the opening 20 is thin, and FIG. 4 is a diagram showing equipotential lines in the interelectrode portion in the present embodiment.

As is clear from these figures, the opening 2
When the wall thickness of 0 is thin, the equipotential line between the resistance contact 19 and the fixed-side contact portion 3 is gentle (see FIG. 3), so that the re-ignition arc 21 branches and enters the opening 20. It is in a state where it is easy to do. Therefore, the re-ignition arc 21 is in a state of easily flashing on the fixed side contact portion 3. On the other hand, the opening 20
When the wall thickness is large, the equipotential line between the resistance contact 19 and the fixed-side contact portion 3 is steep (see FIG. 4), so that the re-ignition arc 21 generated from the movable contact 4 has an opening portion. It is difficult for the arc 22 to enter the inside 20, and the arc 22 can be prevented from flashing over the fixed-side contact portion 3.

FIG. 5 shows the flashover probability to the fixed side contact portion 3 when the thickness ratio 1 / D1 of the opening 20 of the resistance contact 19 is 40%. FIG. 5 is a graph showing the relationship between the ratio 1 / D1 of the opening thickness l of the resistance contact 19 and the opening diameter D1 and the probability of the restriking arc 21 flashing to the fixed side contact portion 3. The flashover probability of this graph is also based on experimental values, like the graph shown in FIG. As shown in the graph, when the ratio 1 / D1 is 40% or more,
The flashover probability to the fixed side contact portion 3 is 0.13%, which is a so-called normal distribution of 3σ. In other words, it is possible to set the probability to such an extent that it will almost never occur in actual operation.

As described above, according to the first embodiment, the ratio D1 / L between the opening diameter D1 and the gap length L is 67.
%, The ratio 1 / D1 of the opening thickness l and the opening diameter D1 is 4
By setting it to 0%, the flashover probability to the fixed-side contact portion 3 can be reduced to a probability (normal distribution 3σ) that can be considered to hardly occur in actual operation. Therefore, the re-ignition arc 21 generated between the movable contact 4 and the resistance contact 19 does not flash through the opening 20 of the resistance contact 19 to the fixed-side contact portion 3, and the movable contact is surely made. Only the resistance contact 19 is reached from the child 4. Therefore, the resistance contact 1
9 and the fixed side contact portion 3 can be energized via the resistor 18. As a result, the resistor 18 can always suppress the voltage level of the disconnector surge that occurs during re-ignition, and the gas disconnector can exhibit excellent reliability.

Second Embodiment [Structure of the Second Embodiment] The second embodiment corresponds to the invention of claim 3, which will be specifically described with reference to FIG. The structural feature of the second embodiment is that the insulating layer 23 is formed at the end of the movable contactor 4 facing the fixed-side contact portion 3.

[Effects of Second Embodiment] In the second embodiment having such a configuration, the re-ignition of the movable contact 4 is performed by the action of the insulating layer 23 formed at the end of the movable contact 4. The position where the arc 21 is generated is set to the opening 2 of the resistance contact 19.
It can be located outside 0. Therefore, the direction of occurrence of the re-ignition arc 21 is set to the lower fixed side contact portion 3
It can be directed not only to the side but to the resistance contact 19 side in the oblique direction in the figure.

As described above, according to the second embodiment, the re-ignition arc 21 is largely prevented from flashing to the fixed side contact portion 3, and the re-ignition arc 21 surely reaches the resistance contact 19. . Therefore, the resistor 18 can electrically mediate between the resistance contact 19 and the fixed-side contact portion 3, and can suppress the voltage level of the disconnector surge that occurs during re-ignition.

Third Embodiment [Structure of Third Embodiment] A third embodiment corresponding to the invention of claim 4 will be specifically described with reference to FIG. As shown in the figure, a mounting member 25 is fixed to the inner surface side of the resistor shield 16, and the closing member 24 made of an insulator is mounted on the resistor shield 16 by this mounting member 25. The closing member 24 closes the opening 20 of the resistance contact 19 in a normal state, and when the movable contact 4 passes through the opening 20 of the resistance contact 19, the closing member 24 moves toward the fixed-side contact portion 3 side. The flexible contact 4 is bent and the opening 2 of the resistance contact 19 is formed.
After opening from 0, the opening 20 is closed again.

[Effects of Third Embodiment] In the third embodiment having the above-described structure, the movable contact 4 separates the opening 20 of the resistance contact 19 and then the closing member 24 opens. Block 20. Therefore, when the gas disconnector performs the opening / closing operation to generate the re-ignition arc 21 between the movable contact 4 and the resistance contact 19, even if the re-ignition arc 21 branches, the closing member 24 opens. Since the portion 20 is closed, the re-ignition arc 21 causes the opening 20 of the resistance contact 19 to move.
It is impossible that the re-ignition arc 21 flashes over the fixed side contact portion 3 because it cannot pass through. Such a third
According to the embodiment, the re-ignition arc 21 can be generated only between the movable contact 4 and the resistance contact 19, and the resistor 18 electrically mediates between the resistance contact 19 and the fixed side contact portion 3. Therefore, it is possible to suppress the voltage level of the disconnector surge that occurs during re-ignition.

Fourth Embodiment [Structure of Fourth Embodiment] The fourth embodiment corresponds to the invention of claim 6, and this embodiment will be described with reference to FIG. As shown in the figure, the first region 26 is provided at the center of the tip of the movable contactor 4 so as to face the fixed-side contact portion 3.
Are formed. Further, a second region 27 is formed in the periphery of the tip of the movable contactor 4 in the vicinity of the resistance contact 19. Then, the electric field value of the first region 26 is X, and the second region 2 is
When the electric field value of 7 is Y, the ratio of two electric field values X / Y
Is 95%.

[Effects of Fourth Embodiment] In the fourth embodiment having the above-described structure, the electric field values of the first region 26 facing the fixed side contact portion 3 and the second region 27 other than the first region 26. Since the ratio X / Y is 95%, the re-ignition arc 21 in the movable contact 4 is generated in the second region, not in the center of the tip of the movable contact 4 forming the first region 26. It becomes the periphery of the tip of the movable contactor 4 forming 27. That is, the generation position of the re-ignition arc 21 in the movable contact 4 can be located outside the opening 20 of the resistance contact 19. Therefore, it is possible to reduce the flashover probability of the restriking arc 21 to the fixed side contact portion 3 to 5%. As a result, the re-ignition arc 21 can surely reach the resistance contact 19, and the resistance contact 19 and the fixed side contact portion 3 can be energized via the resistor 18. According to the gas disconnecting switch of such an embodiment, the voltage level of the disconnecting switch surge generated when the resistor 18 is re-ignited can be suppressed.

Other Embodiments The gas disconnecting switch according to the present invention is not limited to the above-mentioned embodiment, and in the invention of claim 1, the opening diameter D
The ratio D1 / L between 1 and the gap length L may be 20% or more and 67% or less. In the invention of claim 2, the ratio 1 / D1 between the opening thickness l and the opening diameter D1 is 40%. It may be 100% or more and 100% or less. For example, in a UHV gas disconnector, the ratio D1 / L is about 50% or more and 67% or less, and the ratio l
/ D1 is preferably 40% or more and 60% or less. Further, it goes without saying that the shape, size, material, etc. of each constituent member can be appropriately selected.

[0047]

As described above, according to the gas disconnecting switch of the present invention, the probability that the re-ignition arc generated between the movable contact and the resistance contact will flash on the fixed side contact portion is reduced. As a result, the re-ignition arc can reliably reach the resistance contact from the movable contact, and the resistor that electrically mediates between the resistance contact and the fixed-side contact portion can reduce the voltage level of the disconnector surge. It was possible and was able to demonstrate high reliability.

[Brief description of drawings]

FIG. 1 is a sectional view of a gap between electrodes according to a first embodiment of the present invention.

FIG. 2 is a graph showing the relationship between the ratio D1 / L of the opening diameter D1 of the resistance contact and the gap length L and the flashover probability to the fixed side contact portion 3.

FIG. 3 is a diagram showing equipotential lines in a gap between electrodes of a conventional gas disconnector.

FIG. 4 is a diagram showing equipotential lines in an inter-electrode portion of the first embodiment.

FIG. 5 is a graph showing the relationship between the ratio 1 / D1 of the resistance contact opening thickness l and the resistance contact opening diameter D1 and the flashover probability to the fixed side contact portion 3.

FIG. 6 is a sectional view of an interelectrode portion of a second embodiment of the present invention.

FIG. 7 is a sectional view of an interelectrode portion of a third embodiment of the present invention.

FIG. 8 is a sectional view of an interelectrode portion of a fourth embodiment of the present invention.

FIG. 9 is an overall configuration diagram of a conventional example of a gas disconnector.

FIG. 10 is a principle diagram of the gas disconnector shown in FIG.

FIG. 11 is a cross-sectional view of an interelectrode portion of a conventional gas disconnector showing a state in which a re-ignition arc causes a branching phenomenon and flashes through an opening of a resistance contact to a fixed-side contact portion.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Airtight container 2 ... Movable side contact part 3 ... Fixed side contact part 4 ... Movable contactor 5,6 ... Insulation cylinder 7 ... Operation mechanism 8 ... Opening / closing mechanism 9 ... Insulation operation rod 10, 13 ... Conductor 11, 14 ... Finger 12 ... Insulating spacer 15 ... Resistor shield device 16, 17 ... Resistor shield 18 ... Resistor 19 ... Resistive contact 20 ... Opening 21 ... Re-ignition arc 22 ... Branched re-ignition arc 23 ... Insulating layer 24 ... Closing member 25 ... Attachment member 26 ... First area 27 ... Second area X ... Electric field value of first area 26 Y ... Electric field value of second area 27

Claims (6)

[Claims] 1. A fixed-side contact portion and a movable-side contact portion are arranged to face each other in a closed container filled with an insulating and arc-extinguishing gas, and the fixed-side contact portion is arranged in the movable-side contact portion. A movable contact which can be brought into contact with and separated from the movable portion is slidably provided with respect to the movable contact portion, and a resistor is disposed around the fixed contact portion, and the movable contact portion of the resistor is provided. A resistor shield is disposed at an end portion that faces the resistor contact, and the resistor shield is provided with a resistance contact having an opening through which the movable contactor can penetrate. In a gas disconnecting switch in which the gap between the electrodes is formed, when the diameter of the opening of the resistance contact is D1 and the length of the gap, which is the length dimension of the gap, is L, the diameter of the opening D1 and the gap of the gap L
And a ratio D1 / L of 20% or more and 67% or less. 2. A fixed-side contact portion and a movable-side contact portion are arranged to face each other in an airtight container filled with an insulating and arc-extinguishing gas, and the fixed-side contact portion is arranged in the movable-side contact portion. A movable contact which can be brought into contact with and separated from the movable portion is slidably provided with respect to the movable contact portion, and a resistor is disposed around the fixed contact portion, and the movable contact portion of the resistor is provided. A resistor shield is disposed at an end portion that faces the resistor contact, and the resistor shield is provided with a resistance contact having an opening through which the movable contactor can penetrate. A gap between the electrodes, wherein when the thickness of the opening in the axial direction of the movable contact at the opening of the resistance contact is l, the opening thickness l and the opening Ratio 1 / D1 with part diameter D1 is 40% or more and 100%
A gas disconnector characterized by being configured as follows. 3. A fixed-side contact portion and a movable-side contact portion are arranged to face each other in an airtight container filled with an insulating and arc-extinguishing gas, and the fixed-side contact portion is provided to the movable-side contact portion. A movable contact which can be brought into contact with and separated from the movable portion is slidably provided with respect to the movable contact portion, and a resistor is disposed around the fixed contact portion, and the movable contact portion of the resistor is provided. A resistor shield is disposed at an end portion that faces the resistor contact, and the resistor shield is provided with a resistance contact having an opening through which the movable contactor can penetrate. A gas disconnector having a gap between electrodes, wherein an insulating layer is formed at an end of the movable contact facing the fixed contact portion. 4. A fixed side contact portion and a movable side contact portion are arranged facing each other in a closed container filled with a gas having an insulating property and an arc extinguishing property, and the fixed side contact portion is arranged on the movable side contact portion. A movable contact which can be brought into contact with and separated from the movable portion is slidably provided with respect to the movable contact portion, and a resistor is disposed around the fixed contact portion, and the movable contact portion of the resistor is provided. A resistor shield is disposed at an end portion that faces the resistor contact, and the resistor shield is provided with a resistance contact having an opening through which the movable contactor can penetrate. In a gas disconnector having a gap between electrodes, a blocking member for blocking the opening of the resistance contact after the movable contact passes through the opening of the resistance contact is provided in the resistor shield. Gas disconnector characterized by. 5. A fixed-side contact portion and a movable-side contact portion are arranged facing each other in a closed container filled with an insulating and arc-extinguishing gas, and the fixed-side contact portion is arranged in the movable-side contact portion. A movable contact which can be brought into contact with and separated from the movable portion is slidably provided with respect to the movable contact portion, and a resistor is disposed around the fixed contact portion, and the movable contact portion of the resistor is provided. A resistor shield is disposed at an end portion that faces the resistor contact, and the resistor shield is provided with a resistance contact having an opening through which the movable contactor can penetrate. A first region having a low voltage value is formed at a central portion of the movable contact tip, which is opposed to the fixed contact portion, at the tip of the movable contact. A second region having a high voltage value is formed in the peripheral portion close to Gas disconnector characterized and. 6. When the electric field value of the first area is X and the electric field value of the second area is Y, the ratio X / Y of the two electric field values is X / Y.
The gas disconnector according to claim 5, wherein the gas disconnector is configured so as to be 95% or less.