JP2003203543A - Gas-insulated disconnecting switch - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an economical and highly reliable gas-insulated disconnecting switch for restraining the occurrence of a grounding accident from an arc of interpolar discharge without enlarging a dimension of the whole disconnecting switch. <P>SOLUTION: This gas-insulated disconnecting switch has opposed fixed contact part and movable contact part in a metallic tank 12 for sealing insulating gas 11, has the fixed contact part having a fixed contact 18 and a fixed contact part side shield 17, and has the movable contact part having a movable contact part side shield 22 and a movable electrode 19 capable of contacting with and separating from the fixed contact part, and is characterized by arranging a barrier insulator 23 on the outer periphery of clearance between the fixed contact part and the movable electrode 19. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas disconnector which suppresses a ground fault phenomenon from an arc surface to a tank due to an inter-electrode discharge during switching.

[0002]

2. Description of the Related Art A diagram for explaining a conventional gas disconnector is shown in FIG.
Is. The gas disconnector has a movable contact portion and a fixed contact portion as high voltage conductor portions in the metal tank 8, and has a fixed side conductor 1 and a movable side conductor 2 at each contact portion, and a movable side conductor 2 The circuit is turned on and off (closed and opened) by the operation of. During this opening / closing operation, the fixed contact 3 or the fixed contact side shield 5
An arc 7 is generated between the movable electrode 4 and the movable electrode 4. There is a phenomenon that the electric field strength on the surface of the arc becomes high and the metal tank 8 is grounded. Reference numeral 6 is a movable contact portion side shield, and 9 is an insulating gas sealed in the metal tank 8.

FIG. 9 is a graph showing an arc surface electric field in which a ground fault phenomenon occurs in a tank. (Reference: Showa 60
Annual Meeting of the Institute of Electrical Engineers No. 1259) Here, in the part above the curve in the graph and the part where the electric field strength on the arc surface is high, it is a region where the arc is grounded to the tank. In order to suppress such a ground fault phenomenon to the tank, it is necessary to relax the electric field strength against the tank on the arc surface. As this method, the fixed contact portion side shield 5 which is the distance between the poles is arranged so that the arc is kept on the central axis as much as possible.
The distance between the movable contact side shield 6 and the movable contact side shield 6 is increased, the pressure of the insulating gas 9 is increased, and the diameters of the fixed contact side shield 5 and the movable contact side shield 6, which are the shields on both sides between the poles, are increased. For example, the diameter of the tank 8 may be increased. In the conventional disconnector, there is a limit in reducing the distance between the poles and increasing the pressure of the insulating gas, and increasing the shield diameter between the fixed contact portion and the movable contact portion,
Alternatively, the electric field strength on the arc surface is kept low by increasing the tank diameter.

[0004]

However, the above-mentioned method has a problem that the entire disconnecting switch is inevitably large due to the increase in the shield diameter and the tank diameter.

Further, since the opening and closing speeds of the gas-insulated disconnecting switch are relatively low, many re-ignition arcs are likely to occur during opening and closing, and it is essential to reliably prevent the ground fault phenomenon from the arc. is there.

The present invention has been made in view of the above circumstances, and suppresses the occurrence of a ground fault from an arc of a gap between electrodes without increasing the size of the entire disconnecting switch, which is economical and reliable. An object is to provide a high gas insulation disconnecting switch.

[0007]

In order to achieve the above-mentioned object, a gas insulated disconnector according to a first aspect of the present invention is provided with a fixed contact portion and a movable contact portion facing each other in a metal tank filled with an insulating gas. The fixed contact part has a fixed contact and a fixed contact part side shield, and the movable contact part has a movable contact side shield and the fixed contact part, and a gas insulating disconnector having a movable electrode capable of contacting and separating. It is characterized in that a barrier insulator is provided on the outer periphery of the gap between the fixed contact portion and the movable electrode.

According to the invention described in claim 1, the following effects can be obtained.

That is, since the barrier insulator is inserted between the arc generating portion and the metal tank, even if the electric field on the arc surface becomes high, the progress of the discharge generated from there toward the tank is limited. Therefore, it is possible to prevent the occurrence of dielectric breakdown that short-circuits the insulating space and ensure high reliability.

Further, in the gas insulated disconnector according to the second aspect of the present invention, in the gas insulated disconnector, the barrier insulator is arranged at a position having a diameter larger than the maximum diameters of the fixed contact portion and the movable contact portion. It is characterized by that.

According to the invention described in claim 2, the following effects can be obtained.

By arranging the fixed contact portion and the movable contact portion, which are high voltage conductors, at a position having a diameter larger than the maximum diameter, all the high voltage conductors near the disconnector electrodes can be surrounded by the barrier insulator. Therefore, the arc can be reliably surrounded regardless of the position where the arc is generated. Also,
Since it is arranged closer to the metal tank, the barrier insulator can be fixed to the tank.

Further, in the gas insulated disconnector according to the third aspect of the present invention, in the gas insulated disconnector, the barrier insulator is arranged at a position having a diameter smaller than the maximum diameters of the fixed contact portion and the movable contact portion. It is characterized by that.

According to the invention described in claim 3, the following effects can be obtained.

When the electric field is designed so that the location where the arc is generated is closer to the center side, by arranging the barrier at a position where the diameter is smaller than the outer diameter of the contact portion shield where the arc is not generated, the barrier insulator Can be prevented from becoming large,
Further, the unit in which the contact portion and the barrier insulator are integrated has an excellent assembly property.

The gas insulated disconnector according to a fourth aspect of the present invention is characterized in that, in the gas insulated disconnector, a contact portion for energization is provided outside the barrier insulator.

According to the invention described in claim 4, the following effects can be obtained.

When the gas insulation disconnecting switch is in the closed state, a conducting current flows, but a larger conducting cross section and a larger surface area of the conducting portion can suppress the temperature rise of the conducting portion. By providing the contact part for energization on the outside of the barrier insulator which does not generate an arc, the temperature rise of the energization part can be suppressed.

The gas insulated disconnector according to a fifth aspect of the present invention is characterized in that, in the gas insulated disconnector, the barrier insulator is connected to either one of the movable contact portion and the fixed contact portion. .

According to the invention described in claim 5, the following effects can be obtained.

When the disconnector is in the open state, a voltage is generated between the movable contact portion and the fixed contact portion. When connected to both the movable contact portion and the fixed contact portion, the voltage between them is applied to the barrier insulator. Here, when only one of the contact portions is connected, a gas gap exists between the contact portions, and the voltage applied to the barrier insulator is also shared with the gas gap, which facilitates electric field design. .

Further, a gas insulation disconnector according to a sixth aspect of the present invention is characterized in that, in the gas insulation disconnector, a barrier insulator is connected to both the movable contact portion and the fixed contact portion.

According to the invention described in claim 6, the following effects can be obtained.

By connecting the movable contact portion, the fixed contact portion and the barrier insulator, the arc generated in the barrier insulator can be reliably confined. The reliability can be improved by confining the discharge extending from the arc.

According to a seventh aspect of the present invention, there is provided the gas insulated disconnector according to claim 7, wherein the gas insulated disconnector has at least two barrier insulators, one or more on each side of the movable contact portion and the fixed contact portion. It is characterized by being connected.

According to the invention described in claim 7, the following effects can be obtained.

No barrier insulator is connected to both sides of the movable contact portion and the fixed contact portion, and no voltage between the electrodes is applied to the barrier insulator. Also, by stacking barrier insulators connected to the movable contact portion and the fixed contact portion in the radial direction from the arc toward the metal tank,
The structure is effective for confining the arc.

Further, in the gas insulated disconnecting switch according to the present invention, a metal tank filled with an insulating gas has a fixed contact portion and a movable contact portion which face each other for three phases. Has a fixed contactor and a fixed contact part side shield, and the movable contact part has a movable contact part side shield and a movable electrode capable of contacting and separating from the fixed contact part. A barrier insulator is provided around the outer periphery of the gap between the fixed contact portion and the movable electrode.

According to the invention described in claim 8 as described above, the following effects can be obtained.

By enclosing the space between the three-phase disconnector electrodes all together with the barrier insulator, the number of parts of the barrier insulator can be reduced, and the grounded metal tank can be protected against an arc generated in any of the three phases. The entanglement phenomenon can be suppressed.

Further, the gas insulation disconnecting switch according to the invention of claim 9 has a fixed contact portion and a movable contact portion for three phases, which face each other, in a metal tank filled with insulating gas. Has a fixed contactor and a fixed contact portion side shield, and the movable contact portion has a movable contact portion side shield and a movable electrode capable of coming in and out of contact with the fixed contact portion. In addition, a barrier insulator is provided on the outer periphery of the gap between the fixed contact portion and the movable electrode.

Further, in the gas insulated disconnector according to the invention of claim 9, the fixed tank has a stationary tank and a movable tank which are opposed to each other and which have three phases and are opposed to each other in a metal tank filled with an insulating gas. Has a fixed contactor and a fixed contact portion side shield, and the movable contact portion has a movable contact portion side shield and a movable electrode capable of coming in and out of contact with the fixed contact portion. In addition, it has a barrier insulator surrounding an arc generated when the movable electrode is opened and closed with respect to the fixed contact portion.

According to the invention of claim 9 as described above, the following effects can be obtained.

In the three-phase all-in-one configuration, it is possible that the discharge from the arc generated in a certain phase extends not only to the metal tank but also to the other phase. By having a barrier insulator surrounding the arc for each phase, it is effective not only for preventing the metal tank but also for preventing the short circuit phenomenon to other phases.

The gas insulated disconnector according to a tenth aspect of the present invention is the gas insulated disconnector, wherein the barrier insulator is an inner conductor or inner conductor connected to the fixed contact side shield or the movable contact side shield. It is characterized in that it is connected to an insulating spacer supporting the same with airtightness and divides the insulating gas inside and outside the barrier insulator.

According to the invention of claim 10 as described above, the following effects can be obtained.

That is, since the gas can be surely separated, the arc can be surely confined in the space inside the barrier insulator, and the extension of the discharge from the arc can be prevented. Thereby, the reliability of the gas insulation disconnector can be improved.

The gas insulation disconnector according to the invention of claim 11 is characterized in that, in the gas insulation disconnector, the gas pressure of the insulating gas inside and outside the barrier insulator is changed.

According to the invention described in claim 11, the following effects can be obtained.

That is, the gas pressure inside the barrier insulator containing the high-voltage conductor and the arc can be increased to improve the insulation performance, and the gas pressure outside can be made lower than that. Therefore, it is not necessary to increase the mechanical strength of the metal tank as a pressure vessel, and a gas-insulated disconnector having excellent economical efficiency can be obtained.

The gas insulation disconnector according to the twelfth aspect of the invention is characterized in that, in the gas insulation disconnector, the constituent components of the insulating gas inside and outside the barrier insulator are changed.

According to the twelfth aspect of the invention as described above, the following effects can be obtained.

That is, a high voltage conductor having a high electric field strength,
SF inside the barrier insulation containing the₆like
Barrier with low electric field strength using gas with excellent insulation performance
On the outside of the insulator, SF₆Use cheaper gas other than
Can be expensive SF ₆To reduce the use of
You can also Therefore, with a gas-insulated disconnector with excellent economy
can do.

Further, in the gas insulated disconnector according to the invention of claim 13, in the gas insulated disconnector, the barrier insulator is sublimated or thermally decomposed by the thermal energy of the arc when the arc is generated, and has a high thermal conductivity. It is characterized by containing a material that releases a molecule.

According to the invention described in claim 13, the following effects can be obtained.

The thermal conductivity of the arc can be increased by incorporating a material into the barrier insulator that emits a molecule having a small molecular weight by ablation when the arc is generated. As the thermal conductivity of the arc increases, the arc becomes thicker and the electric field strength on the arc surface can be reduced. That is, it is possible to reduce the probability of discharge from the arc surface toward the metal tank.

The barrier insulator is preferably epoxy resin, glass fiber reinforced plastic (FRP), or Teflon (registered trademark). That is,
Epoxy resin, glass fiber reinforced plastic (FR
P) and Teflon (registered trademark) have excellent insulation performance. In particular, since FRP is also excellent in mechanical strength, insulation between the inside and outside of the barrier insulator and separation of the inside and outside gases can be reliably performed, and reliability can be improved.

Further, the material to be contained in the barrier insulator is preferably an organic polymer.

The organic polymer easily releases hydrocarbons and the like and is effective in increasing the thermal conductivity of the arc. Polytetrafluoroethylene (PTF) as an organic polymer
E), polyacetal and the like.

Further, as a material to be contained in the barrier insulator, boron nitride (BN) or boron carbonitride (BNC)
Is preferred.

BN or BNC has a high thermal conductivity and is effective in increasing the thermal conductivity of the entire arc.

Further, in the gas insulated disconnector according to the fourteenth aspect of the present invention, in the gas insulated disconnector, the electrode material of the movable contact portion or the fixed contact portion where the arc is generated has a work function higher than that of copper, tungsten or iron. It is characterized by containing a small metal material.

According to the invention described in claim 14, the following effects can be obtained.

Regarding the electrode where the arc is generated, thermoelectron emission and field electron emission are generated at the arc spot of the cathode. By including a material that easily emits electrons in the electrodes, the base of the arc becomes wide, and the arc diameter can be increased and the arc surface electric field can be suppressed.

As metallic materials, yttrium, titanium, alkali metals, alkaline earth metals, BaB ₆ , SrB ₆ , Ca
_{B 6, LaB 6, TiC,} ZrC, ZMoC, TaC, W 2 C, TiN, ZrN, Mg
O, CaO, SrO, BaO, TiO ₂ , ZrO ₂ , ThO ₂ , BaS, CdS, LaS
It is preferable to contain at least one element from among the above.

Yttrium and the like have a small work function and are easy to emit electrons, and are effective in expanding the arc diameter.

According to a fifteenth aspect of the present invention, in the gas insulated disconnector, in the gas insulated disconnector, the movable contact or the fixed contact is provided with a magnetic field generating means having a component orthogonal to the arc, and the arc is driven to rotate. The feature is to let.

According to the invention described in claim 15, the following effects can be obtained.

When the arc is driven to rotate by a magnetic field, the same effect as that of effectively increasing the arc diameter can be obtained. Also, because the arc electric field changes in a short time,
The stress on the space is relieved.

[0060]

Embodiments of the present invention will be described in detail below with reference to the drawings. It should be noted that parts corresponding to the same parts will be described with the same reference numerals.

[First Embodiment] [Structure] FIG. 1 is a sectional view showing the structure of a gas insulation disconnector according to a first embodiment of the present invention. As shown in the figure,
In this embodiment, a fixed-side conductor 13 and a movable-side conductor 14 are provided facing each other with a gap in the axial direction in a cylindrical metal tank 12 containing an insulating gas 11. A concave portion 1 is formed in the central portion of the fixed conductor 13 facing the movable conductor 14.
5, a fixed contact portion side shield 17 having a protrusion 16 formed on the outer peripheral portion thereof is provided, and a fixed contact 18 is provided in the center of the recess 15 of the fixed contact portion side shield 17. It is formed to be shorter than the tip of 17. A movable electrode 19 is provided on the shaft portion of the movable-side conductor 14 so as to protrude toward the fixed-side conductor 13 side facing portion, and a recess 20 is formed at the center of the tip of the movable electrode 19.
A movable contact portion side shield 22 having a protruding portion 21 formed on the outer peripheral portion of the fixed side conductor 13 side facing portion of the movable side conductor 14.
Is provided. The fixed contact 18 and the fixed contact portion side shield 17 form a fixed contact portion, and the movable contact portion side shield 22 and the movable electrode 19 form a movable contact portion. When the movable contact portion is moved to the fixed contact portion side, the recess 20
The movable electrode 19 is inserted into the concave portion 15 while the fixed contactor 18 is inserted thereinto, and the movable contact portion side shield 22 is brought into contact with the fixed contact portion side shield 17. A cylindrical barrier insulator 23 is coaxially attached to the inner wall of the metal tank 12 by a support insulator 24 and is attached to the outer periphery of the gap formed between the movable contact portion and the fixed contact portion opposite to each other. .

In this way, the movable electrode 19 is constructed so as to be able to come into contact with and separate from the fixed contact portion, and when the movable contact portion is moved,
An arc 25 is generated between the movable contact portion and the fixed contact portion as opening / closing discharge. The arc 25 is mainly the movable electrode 19
Between the fixed contact portion side shield 17 and the fixed contact portion side shield 17. The barrier insulator 23 is inserted between the arc 25 and the metal tank 12 so as to surround the arc 25. The barrier insulator 23 is insulated and supported by a support insulator 24 attached to the inner wall of the metal tank 12. Further, the barrier insulator 23 and the support insulator 24 may be integrated. The barrier insulator 23 and the support insulator 24 may be fastened together with a belt or the like made of an insulator.

Further, as the insulating gas 11 enclosed in the metal tank 12, a single gas of sulfur hexafluoride gas, nitrogen gas, dry air, carbon dioxide or oxygen,
Alternatively, a mixed gas composed of any of them is used. Furthermore, as the barrier insulator 23, for example, an epoxy resin having excellent electric field strength and mechanical strength, FRP, Teflon (registered trademark), or the like is used.

[Advantages] The advantages of the present embodiment having the above-mentioned structure are as follows.

That is, since the barrier insulator 23 is inserted between the arc 25 and the metal tank 12, even if the electric field on the surface of the arc 25 increases, the progress of the discharge generated from there toward the tank 12 is limited. To be done. Therefore, it is possible to prevent the occurrence of dielectric breakdown that short-circuits the insulating space and ensure high reliability.

Further, in the gas insulated disconnecting switch according to the present embodiment example, the barrier insulator 23 improves the insulation performance against the ground fault from the arc 25, so that the S insulation having excellent insulation performance is provided.
Even with an insulating gas other than F ₆ , it is possible to ensure the same insulation performance against arcs as that of the conventional gas insulated disconnecting switch. Therefore, the amount of expensive SF ₆ used can be reduced,
The device can have excellent insulation.

[Second Embodiment] [Structure] FIG. 2 is a sectional view showing the structure of a gas insulation disconnector according to a second embodiment of the present invention. As shown in the figure, in this embodiment, the barrier insulator 23 is inserted between the metal tank 12 and the arc 25 generated between the movable contact portion and the fixed contact portion in the metal tank 12.
The barrier insulator 23 is made of the same material as that of the first embodiment and is attached to the movable side contact portion and the fixed side contact portion.

The barrier insulator 23 is attached to the fixed contact side shield 17 and the movable contact side shield 22 so as to be arranged on the outer peripheral portion of the gap between the fixed contact 18 and the movable electrode 19.

The insulating gas 11 sealed in the metal tank 12 is the same as in the first embodiment.

[Operation and Effect] The operation and effect of the present embodiment having the above-mentioned structure are as follows.

That is, since the barrier insulator 23 is inserted between the arc 25 and the metal tank 12, even if the electric field on the surface of the arc 25 becomes high, the progress of the discharge generated from there toward the tank 12 is limited. To be done. In particular, since it is connected to both sides of the movable side contact portion and the fixed side contact portion, the arc generated in the barrier insulator 23 can be surely confined, and high reliability can be secured.

[Third Embodiment] [Structure] FIG. 3 is a sectional view showing the structure of a gas insulation disconnector according to a third embodiment of the present invention. (A) is a cross-sectional view during the opening / closing operation, and (b) is a cross-sectional view during opening. As shown in the figure, in this embodiment, the barrier insulator 23 is inserted between the metal tank 12 and the arc 25 generated between the movable contact portion and the fixed contact portion in the metal tank 12. The barrier insulator 23 is made of the same material as that of the first embodiment and is attached to the movable conductor 14.
It is operable with the movable conductor 14. The arc 25 is mainly generated between the fixed contact 18 and the movable electrode 19.

The barrier insulator 23 is attached to the movable electrode 19 so as to be arranged on the outer periphery of the gap between the fixed contact 18 and the movable electrode 19, and the fixed side conductor 13 is provided with the barrier insulator 2.
A barrier insulator insertion portion 26 into which 3 can be inserted / removed is provided.

The barrier insulator may be provided at the fixed contact portion such as the fixed side conductor, and the barrier insulator insertion portion may be provided at the movable contact portion such as the movable side conductor.

As shown in FIGS. 3 (a) and 3 (b), during opening / closing operation when the movable electrode 19 is attached to / detached from the fixed contact 18, and when the contact is opened, the barrier insulator 23 causes the movable electrode 19 and the fixed contact 18 to move. Enclose the perimeter of the gap between.

Further, the insulating gas 11 sealed in the metal tank 12 is the same as that in the first embodiment.

[Advantages] The advantages of the present embodiment having the above-mentioned structure are as follows.

That is, since the barrier insulator 23 is inserted between the arc 25 and the metal tank 12, even if the electric field on the surface of the arc 25 becomes high, the progress of the discharge generated from there toward the tank 12 is limited. To be done. Barrier insulator 2
3 is connected only to the movable side contact portion, and not all the voltage between the electrodes is applied to the insulator, which facilitates the electric field design of the insulator. Further, the barrier insulator 23 has a sufficient length to surely surround the arc 25 with respect to the tank 12 during the opening / closing operation.

[Fourth Embodiment] [Structure] FIG. 4 is a sectional view showing the structure of a gas insulation disconnector according to a fourth embodiment of the present invention. (A) is a cross-sectional view during the opening / closing operation, and (b) is a cross-sectional view during opening. As shown in the figure, in this embodiment, the barrier insulators 23, 23 are inserted between the metal tank 12 and the arc 25 generated between the movable contact portion and the fixed contact portion in the metal tank 12. There is. The barrier insulators 23, 23 are the above-mentioned first
It is made of the same material as that of the embodiment and is attached to the movable side contact portion and the fixed side contact portion. The arc 25 is mainly generated between the fixed contact 18 and the movable electrode 19.

The barrier insulator 23 is attached to the movable electrode 19 so as to be arranged on the outer periphery of the gap between the fixed contact 18 and the movable electrode 19, and the fixed side conductor 13 has the barrier insulator 2 attached thereto.
A barrier insulator insertion portion 26 into which 3 can be inserted / removed is provided.
Another barrier insulator 2 is formed on the outer periphery of the barrier insulator 23.
3 is attached to the fixed contact side shield 17, and the barrier insulator 23 is formed shorter than the barrier insulator 23 of FIG. Fixed contact 18 with both barrier insulators 23, 23
And the movable electrode 19 is formed so as to surround the outer peripheral portion of the gap.

As shown in FIGS. 4 (a) and 4 (b), both the barrier insulators 23 and 23 are connected to the movable electrode 19 at the time of opening / closing operation when the movable electrode 19 is attached / detached to / from the fixed contact 18 and at the time of opening the electrode. The outer circumference of the gap between the fixed contacts 18 is surrounded.

The insulating gas 11 sealed in the metal tank 12 is the same as in the first embodiment.

[Advantages] The advantages of the present embodiment having the above-mentioned structure are as follows.

That is, since the barrier insulators 23, 23 are inserted between the arc 25 and the metal tank 12,
Even if the electric field on the surface of the arc 25 rises, the tank 1
The progress of the discharge that occurs toward 2 is limited. The barrier insulators 23, 23 are connected to both sides of the movable-side contact portion and the fixed-side contact portion, and not all the voltage between the electrodes is applied to the insulator, which facilitates the electric field design of the insulator. In addition, the barrier insulators 23, 23 are overlapped in the radial direction from the arc 25 to the tank 12,
The structure is such that the arc 25 can be surely surrounded with respect to the tank 12 during the opening / closing operation.

[Fifth Embodiment] [Structure] FIG. 5 is a sectional view showing the structure of a gas insulation disconnector according to a fifth embodiment of the present invention. (A) is a sectional view at the time of closing, and (b) is a sectional view at the time of opening / closing operation. As shown in the figure, in this embodiment, the barrier insulator 23 is inserted between the metal tank 12 and the arc 25 generated between the movable contact portion and the fixed contact portion in the metal tank 12. The barrier insulator 23 is made of the same material as that of the first embodiment and is attached to the movable conductor 14.
It is operable with the conductor 14. Further, it has a fixed side energization contact 28 and a movable side energization contact 27. Arc 25
Occurs mainly between the fixed contact 18 and the movable electrode 19.

The barrier insulator 23 is attached to the movable electrode 19 so as to be arranged on the outer peripheral portion of the gap between the fixed contact 18 and the movable electrode 19, and the fixed side conductor 13 is covered with the barrier insulator 2.
A barrier insulator insertion portion 26 into which 3 can be inserted / removed is provided.
A movable-side energizing contact 27 is provided on the movable contact-side shield 22 so as to project toward the fixed contact-side shield 17 along the outer peripheral surface of the barrier insulator 23, and on the inner peripheral surface of the fixed contact-side shield 17. The fixed side energization contact 28 is provided so that the movable side energization contact 27 can be inserted and removed.

As shown in FIG. 5A, when the fixed contact 18 is inserted into the movable electrode 19, the barrier insulator 23 is inserted into the barrier insulator insertion portion 26, and the movable side energization contact is made. 27 is inserted into the stationary side energizing contact 28.
As shown in FIG. 5B, the barrier insulator 23 surrounds the outer circumference of the gap between the movable electrode 19 and the fixed contact 18 during the opening / closing operation in which the fixed contact 18 is escaped from the movable electrode 19.

The barrier insulator may be provided at the fixed contact portion such as the fixed side conductor, and the barrier insulator insertion portion may be provided at the movable contact portion such as the movable side conductor.

The insulating gas 11 sealed in the metal tank 12 is the same as in the first embodiment.

[Function and Effect] The function and effect of the present embodiment having the above-mentioned structure are as follows.

That is, since the barrier insulator 23 is inserted between the arc 25 and the metal tank 12, even if the electric field on the surface of the arc 25 becomes high, the progress of the discharge generated from there toward the tank 12 is limited. To be done. Barrier insulator 2
3 is connected only to the movable side contact portion, and not all the voltage between the electrodes is applied to the insulator, which facilitates the electric field design of the insulator. Further, the barrier insulator 23 has a sufficient length to surely surround the arc 25 with respect to the tank 12 during the opening / closing operation. Also,
In the energized state when the electrodes are closed, a current flows through the energized contact having a large energized cross-sectional area and a large surface area for heat dissipation, and the temperature rise of the energized portion can be suppressed.

[Sixth Embodiment] [Structure] FIG. 6 is a sectional view showing the structure of a gas insulation disconnector according to a sixth embodiment of the present invention. (A) is a cross-sectional view (transverse cross-sectional view) from above, and (b) is a side cross-sectional view (longitudinal cross-sectional view). As shown in the figure, in the present embodiment example, in the metal tank 12 in which the insulating gas 11 is filled,
The stationary contact portion and the movable contact portion are opposed to each other, and the stationary contact portion has a stationary contact 18 and a stationary contact portion side shield 17,
The movable contact portion is a three-phase collective gas-insulated disconnector having a movable contact side shield 22 and a movable electrode 19 capable of contacting and separating from the fixed contact portion. The barrier insulator 2 made of the same material as in the above-described first embodiment is also provided between the metal tank 12 and the arc 25 generated between the fixed portion and the fixed contact portion.
3 is inserted. The barrier insulator 23 collectively surrounds the high-voltage conductor portions for three phases. Therefore,
It is possible to provide a barrier insulator 23 that surrounds all the arcs 25 generated when the movable electrode 19 is opened and closed with respect to the fixed contact portions for the three phases.

Gas insulation disconnecting switches 29, 30, 31 for three phases
A cylindrical barrier insulator 23 is integrally attached to the outer periphery of the gap between each fixed contact portion and the movable electrode 19 and is coaxially insulated and supported on the inner wall of the metal tank 12 by the support insulator 24.

The insulating gas 11 sealed in the metal tank 12 is the same as that in the above-described first embodiment.

[Advantages] The advantages of the present embodiment having the above-mentioned structure are as follows.

That is, since the barrier insulator 23 is inserted between the arc 25 generated in any phase and the metal tank 12, even if the electric field on the surface of the arc 25 becomes high, the barrier insulator 23 is directed toward the tank 12. The progress of the generated discharge is limited. It is possible to suppress the ground fault phenomenon to the tank 12 with one barrier insulator 23 having a small number of parts for the three-phase gaps.

[Seventh Embodiment] [Structure] FIG. 7 is a sectional view showing the structure of a gas insulation disconnector according to a seventh embodiment of the present invention. (A) is a cross-sectional view (transverse cross-sectional view) from above, and (b) is a side cross-sectional view (longitudinal cross-sectional view). As shown in the figure, in the present embodiment example, in the metal tank 12 in which the insulating gas 11 is filled,
The stationary contact portion and the movable contact portion are opposed to each other, and the stationary contact portion has a stationary contact 18 and a stationary contact portion side shield 17,
The movable contact part is a movable contact part side shield 22 and a movable electrode 19 which can be contacted and separated from the fixed contact part. Arc 25 generated between contact parts
Also, barrier insulators 23, 23, 23 made of the same material as in the first embodiment are individually inserted between the metal tank 12 and each phase. The barrier insulators 23, 23, 23 individually surround the high voltage conductor portion for each phase. Therefore, the arc 25 generated when the movable electrode 19 is opened and closed with respect to the fixed contact portion for each phase.
Barrier insulators 23, 23, 23 may be provided to individually surround the.

Cylindrical barrier insulators 23, 23, 23 are individually provided around the outer periphery of the gap between the fixed contact portions of the gas insulation disconnecting switches 29, 30, 31 of each phase and the movable electrode 19, and the supporting insulator 24. , 24, 24 are coaxially insulated and supported and attached to the inner wall of the metal tank 12.

The insulating gas 11 sealed in the metal tank 12 is the same as in the first embodiment.

[Advantages] The advantages of the present embodiment having the above-mentioned structure are as follows.

That is, since the barrier insulator 23 is inserted in each phase between the metal tank 12 and the arc 25 generated in each phase, even if the electric field on the arc 25 surface becomes high, The progress of the discharge generated toward the tank 12 is limited. Further, the arc 25 generated in a certain phase
For the phenomenon that the discharge from the battery extends not only to the metal tank 12 but also to other phases, the barrier insulators 23, 23, 2
Since it has 3, it is effective.

[Eighth Embodiment] [Structure] FIG. 8 is a sectional view showing the structure of a gas insulation disconnector according to an eighth embodiment of the present invention. As shown in the figure, in the present embodiment, between the arc 25 generated between the movable contact portion and the fixed contact portion in the metal tank 12 and the metal tank 12, the same as in the above-described first embodiment example. A barrier insulator 23 made of a different material is inserted. The barrier insulator 23 is connected to the fixed contact side shield 17 or the movable contact side shield 22 to form the high-voltage inner conductor 1.
It is insulated and supported by insulating spacers 32 and 33 which support 3 and 14. That is, by the barrier insulator 23 and the insulating spacers 32 and 33, the high voltage inner conductors 13 and 1
A hermetic container having airtightness is configured around 4, and an insulating gas space is divided inside and outside the barrier insulator 23.

The fixed-side conductor 13 is a disk-shaped insulating spacer 3.
2, the movable side conductor 14 is insulated and supported in the axial direction in the metal tank 12 by the disc-shaped insulating spacer 33.
Insulated in the axial direction. Cylindrical barrier insulators 23 are attached to the insulating spacers 32 and 33 at both ends on the outer peripheral portions of the movable contact portions of the movable side conductor 14 and the fixed side conductor 13 opposite to the movable contact portions and the fixed contact portions.
Insulated and supported coaxially with.

The barrier insulator 23 may be hermetically connected to the fixed-side conductor 13 and the movable-side conductor 14 of the high-voltage inner conductor.

The insulating gas 11 sealed in the metal tank 12 is the same as that in the above-described first embodiment.

[Advantages] The advantages of the present embodiment having the above-mentioned structure are as follows.

That is, since the barrier insulator 23 is inserted between the arc 25 and the metal tank 12, even if the electric field on the surface of the arc 25 becomes high, the progress of the discharge generated from there toward the tank 12 is limited. To be done. Therefore, it is possible to prevent the occurrence of insulation breakdown that short-circuits the insulation space,
It is possible to secure high reliability.

Further, in the gas insulated disconnecting switch according to the present embodiment example, since the barrier insulator 23 improves the insulation performance against the ground fault from the arc 25, the S insulation having excellent insulation performance is obtained.
Even with an insulating gas other than F ₆ , it is possible to ensure the same insulation performance against arcs as that of the conventional gas insulated disconnecting switch. Therefore, the amount of expensive SF ₆ used can be reduced,
The device can have excellent insulation.

In particular, in this embodiment, the gas can be divided, so that the barrier insulator 2 in which the arc 25 exists.
It is possible to use an insulating gas having excellent insulation performance such as SF _{6 on} the inner side of 3 and an inexpensive insulating gas other than SF _{6 on the} outer side of the barrier insulator 23 having a low electric field strength.

Further, since the gas can be divided, the gas pressure of the insulating gas can be changed between the inside and the outside of the barrier insulator 23. That is, the barrier insulator 23
The gas pressure on the inner side can be increased to suppress the discharge from the arc 25, and the gas pressure on the outer side can be lowered.
Therefore, the pressure can be made to be similar to that of the conventional gas insulated disconnector, and it is not necessary to increase the mechanical strength of the metal tank 12 as a pressure container. Also, the barrier insulator 23 only needs to consider the pressure difference between the inside and the outside, and can be designed according to the design criteria conventionally used as a pressure vessel such as FRP.

When the barrier insulator 23 having a plurality of airtightness is provided, the gas pressure can be considerably increased in the gas section including the innermost arc by making the gas pressure higher toward the inner side. Accordingly, it becomes possible to provide a gas insulated disconnector having an economically excellent configuration.

[Other Embodiments] It should be noted that the present invention is not limited to the above-mentioned embodiments, and the specific shapes of the respective members, the mounting positions and the methods thereof can be appropriately changed. For example, the shape of the barrier insulator 23 is not limited to the illustrated shape, and may be any other shape as long as it surrounds the arc and can suppress the extension of discharge.

Further, in the eighth embodiment shown in FIG. 8, both ends of the barrier insulator 23 are insulating spacers 32 and 33.
May be fixed to the barrier insulator or the barrier insulator 2
It is also possible to separately provide a support insulator that insulates and supports 3 and to fix it and the end portion of the barrier insulator 23 to form a sealed container.

Further, the barrier insulator may be made to contain a material which sublimes or thermally decomposes by the thermal energy of the arc when the arc is generated and releases a molecule having a high thermal conductivity.

An organic polymer can be used as a material contained in the barrier insulator.

BN or BNC can be used as a material to be contained in the barrier insulator.

The electrode material of the movable contact portion or the fixed contact portion where the arc is generated may contain a metal material having a work function smaller than that of copper, tungsten or iron.

As the metal material contained in the electrode material of the movable contact portion or the fixed contact portion, yttrium, titanium, alkali metal, alkaline earth metal, BaB ₆ , Sr, etc.
_{B 6, CaB 6, LaB 6} , TiC, ZrC, ZMoC, TaC, W 2 C, TiN, Zr
N, MgO, CaO, SrO, BaO, TiO ₂ , ZrO ₂ , ThO ₂ , BaS, Cd
At least one element can be included from S and LaS.

It is also possible to rotate the arc by providing a means for generating a magnetic field having a component orthogonal to the arc in the movable contact portion or the fixed contact portion.

[0120]

As described above, according to the present invention, the arc generated when the gas insulated disconnector is opened / closed can be confined in the insulator, and the ground fault phenomenon from the arc to the tank can be suppressed. Become. Further, it is possible to increase the thermal conductivity of the arc and facilitate the emission of electrons from the electrode, resulting in a thicker arc diameter and a lower surface electric field. As a result, it is possible to provide a compact and highly reliable gas-insulated disconnector without the need for enlarging the shield diameter between the electrodes or enlarging the tank diameter for suppressing the electric field on the arc surface.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a configuration of a gas insulation disconnector according to a first embodiment of the present invention when opened and closed.

FIG. 2 is a cross-sectional view showing a configuration of a gas insulation disconnector according to a second embodiment of the present invention when opened and closed.

FIG. 3 is a cross-sectional view showing a configuration of a gas insulation disconnector according to a third embodiment of the present invention during opening / closing operation and opening.

FIG. 4 is a cross-sectional view showing a structure of a gas insulation disconnector according to a fourth embodiment of the present invention during opening / closing operation and opening.

FIG. 5 is a cross-sectional view showing a configuration of a gas insulation disconnector according to a fifth embodiment of the present invention during closing and opening / closing operations.

6A and 6B are a horizontal cross-sectional view and a vertical cross-sectional view at the time of opening and closing, showing the configuration of a gas insulation disconnector according to a sixth embodiment of the present invention.

7A and 7B are a horizontal sectional view and a vertical sectional view at the time of opening and closing, showing a configuration of a gas insulation disconnector according to a seventh embodiment of the present invention.

FIG. 8 is a cross-sectional view showing the structure of a gas insulation disconnector according to an eighth embodiment of the present invention when opened and closed.

FIG. 9 is a characteristic diagram illustrating a ground fault phenomenon from an arc surface in a conventional gas insulated disconnector.

FIG. 10 is a cross-sectional view showing a configuration of a conventional gas insulation disconnector.

[Explanation of symbols]

11 insulating gas 12 metal tanks 13 Fixed side conductor 14 Movable conductor 17 Fixed contact side shield 18 Fixed contact 19 Movable electrode 22 Movable contact side shield 23 Barrier insulation 24 Support insulator 25 arc 27 Movable side energizing contact 28 Fixed side energizing contact 32 insulating spacer 33 Insulation spacer

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Yuji Arima             2-1, Ukishima-cho, Kawasaki-ku, Kawasaki-shi, Kanagawa             Ceremony Company Toshiba Hamakawasaki Factory (72) Inventor Ken Shinkai             2-1, Ukishima-cho, Kawasaki-ku, Kawasaki-shi, Kanagawa             Ceremony Company Toshiba Hamakawasaki Factory F-term (reference) 5G017 BB02 DD01 HH04                 5G027 AA08 AA09 DA06

Claims (15)

[Claims] 1. A metal tank containing an insulating gas has a fixed contact portion and a movable contact portion facing each other, the fixed contact portion has a fixed contact and a shield on the fixed contact portion side, and the movable contact portion is A gas insulation disconnector having a movable contact side shield and a movable electrode capable of coming into contact with and separating from the fixed contact portion, wherein a barrier insulator is provided around an outer periphery of a gap between the fixed contact portion and the movable electrode. Gas insulated disconnector. 2. The gas insulated disconnector according to claim 1, wherein the barrier insulator is arranged at a position having a diameter larger than the maximum diameter of the fixed contact portion and the movable contact portion. 3. The gas insulated disconnector according to claim 1, wherein the barrier insulator is arranged at a position having a diameter smaller than the maximum diameter of the fixed contact portion and the movable contact portion. 4. The gas insulated disconnector according to claim 3, wherein a contact portion for energization is provided outside the barrier insulator. 5. The gas insulated disconnector according to claim 3, wherein the barrier insulator is connected to either one of the movable contact portion and the fixed contact portion. 6. The barrier insulating material is connected to both the movable contact portion and the fixed contact portion, as claimed in claim 3 or 4.
The gas-insulated disconnector described. 7. The gas-insulated disconnector according to claim 3, wherein at least two barrier insulators are provided, and one or more barrier movable insulators are connected to each of the movable contact portion and the fixed contact portion. 8. A metal tank containing an insulating gas has three phases of fixed contact parts and movable contact parts facing each other, and the fixed contact part has a fixed contact and a fixed contact part side shield. ,
The movable contact part is a three-phase batch gas insulation disconnector having a movable contact side shield and a movable electrode capable of contacting and separating from the fixed contact part. A gas-insulated disconnector for a three-phase package, characterized in that a barrier insulator is provided on the. 9. A metal tank filled with an insulating gas has a fixed contact portion and a movable contact portion facing each other for three phases, and the fixed contact portion has a fixed contact and a fixed contact portion side shield. ,
The movable contact part is a three-phase collective gas-insulated disconnector having a movable contact side shield and a movable electrode that can be contacted and separated from the fixed contact part, and the outer periphery of the gap between the fixed contact part and the movable electrode for each phase. A gas-insulated disconnector for a three-phase package, characterized in that a barrier insulator is provided on the. 10. A barrier insulator is hermetically connected to an inner conductor connected to a fixed contact portion side shield or a movable contact portion side shield or an insulating spacer supporting the inner conductor, and the barrier insulator is connected inside and outside the barrier insulator. The gas insulation disconnecting switch according to claim 1, wherein the insulation gas is divided. 11. The gas insulated disconnector according to claim 10, wherein the gas pressure of the insulating gas inside and outside the barrier insulator is changed. 12. The composition of the insulating gas inside and outside the barrier insulator is changed.
The gas-insulated disconnector described. 13. The barrier insulating material contains a material which, when an arc is generated, is sublimated or thermally decomposed by the thermal energy of the arc to release a molecule having a high thermal conductivity. The gas-insulated disconnector according to item 1. 14. The metal material having a work function smaller than that of copper, tungsten, or iron is contained in the electrode material of the movable contact portion or the fixed contact portion where the arc is generated. A gas insulated disconnector according to the item. 15. The gas insulation according to claim 1, wherein the movable contact portion or the fixed contact portion is provided with means for generating a magnetic field having a component orthogonal to the arc to drive the arc to rotate. Disconnector.