KR101072518B1

KR101072518B1 - Disconnecting switch

Info

Publication number: KR101072518B1
Application number: KR1020100087837A
Authority: KR
Inventors: 다츠로 가토; 도시아키 로쿠노헤; 료이치 시노하라
Original assignee: 가부시키가이샤 니혼 에이이 파워시스템즈
Priority date: 2009-09-09
Filing date: 2010-09-08
Publication date: 2011-10-11
Also published as: KR20110027604A; JP2011060535A; TWI421893B; CN102024610A; JP5434406B2; TW201120932A

Abstract

The insulation performance of the disconnecting unit is increased, and the diameter of the metal container of the disconnecting unit can be reduced.
A fixed-side conductor 7 provided in the center conductor of one insulating spacer in a sealed container 1 partitioned by insulating spacers 10a and 10b each having a center conductor 18a and 18b and encapsulating an insulating gas, The fixed side contactor 5a connected to the fixed side conductor 7, the fixed arc contact 3A provided inside the fixed side contactor 5a, and the fixed side contactor 5a. A mover which contacts the side shield 6a, the fixed side contactor 5a and the arc contact 3A, and opens from the fixed side contactor 5a prior to the opening of the arc contact 3A. (2) and a disconnecting device comprising a spring 4 for following the arc contact 3A to the axial movement during opening of the mover 2 and a follower means for the supporting frame 15A. The coil contacts 22 and the magnetic material are inducted in series with each other between the arc firing portion 21 of the arc contact 3A and the fixed side conductor 5a.

Description

Disconnector {DISCONNECTING SWITCH}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disconnector, and more particularly, to a disconnector of a switchgear installed in a substation or switchgear.

In switching devices such as a disconnector or a circuit breaker constituting the gas insulated switchgear, there is a high possibility of high frequency switching surge at the time of switching. In particular, in a disconnector having a relatively slow opening and closing speed, re-ignition is likely to occur during opening operation.

The generated surge by re-ignition during the opening operation of the disconnector has a high frequency from several MHz to several tens of MHz, and its occurrence frequency is abnormally high. Moreover, since such a generated surge is a steep overvoltage with a high frequency, the problem of the insulation performance of a disconnector arises.

As one of the countermeasures for suppressing the occurrence of surge which causes the decrease in insulation performance, for example, Japanese Patent Laid-Open Publication No. Hei 3-129615 (Patent Document 1) arranges a resistor in the vicinity of a portion where a surge occurs. In order to reduce the crest value of a steep surge voltage, a disconnector has been proposed.

However, the countermeasure of patent document 1 has a problem that a disconnecting part becomes large. In order to solve this problem, Japanese Patent Laid-Open Publication No. Hei 5-342952 (Patent Document 2) installs an inductance coil in a fixed contact portion of a disconnecting device to prevent the enlargement of the disconnecting portion, and thus the crest value of the open / close surge voltage is adjusted. The countermeasure which reduces is proposed.

In FIG. 16, the Example of the switching device which concerns on patent document 2 is shown. This switching device is characterized in that the inductance coil 102 is connected to the fixed electrode 101 in series, and the inductance coil 102 is connected to the shield 103 again. From this configuration, after the movable contact 104 is opened from the tulip contact 105, the arc discharge flows from the shield 103 via the inductance coil 102 to the fixed electrode 101.

Thereby, it becomes possible to reduce the crest value of the open / close surge voltage while preventing the enlargement of the disconnecting part. In this configuration, the inductance coil 102 has a structure in which a current flows only during the opening operation. Therefore, the effect of inductance for realizing surge reduction is to act only at the time of the opening operation in which surge easily occurs. As a result, it is possible to effectively suppress the high-frequency surge voltage.

However, according to the structure of the said patent document 2, the shield 103 is exposed to an arc. As a result, the shield 103 may deteriorate and consume, leading to a decrease in insulation.

Moreover, according to the structure of patent document 2, since the shield 103 is exposed to an arc, a high voltage is applied to this part. For this reason, insulation performance cannot be maintained unless the fixed distance is taken between the shield 103 and a metal container. As a result, there is a limit in miniaturization of the metal container.

Moreover, according to the structure of patent document 2, in order to suppress deterioration and consumption of the shield 103 by exposure to an arc, it is necessary to manufacture the shield 103 using the expensive metal material with few melting. . This causes a problem that the manufacturing cost increases.

An object of the present invention is to solve the problems of the present invention while maintaining the effect that the effect of inductance for realizing surge reduction acts only at the time of opening operation that is likely to cause surge. That is, it aims at maintaining insulation performance of a disconnecting device, and realizing further reduction of the diameter of a metal container and reduction of a manufacturing cost.

MEANS TO SOLVE THE PROBLEM In order to solve the said subject, this invention which concerns on Claim 1 is a fixed side conductor provided in the center conductor of one insulation spacer in the sealing container which is divided into the insulation spacer which has a center conductor, respectively, and encloses insulating gas, and said A fixed side contactor connected to the fixed side conductor, an arc contact provided inside the fixed side contactor, a fixed side shield disposed surrounding the fixed side contactor, the fixed side contactor and the arc contact And a disconnector having a mover open from the fixed side contact prior to the opening with the arc contact, and a tracking means for following the arc contact to the axial movement during opening of the mover. And an inductance electrically inserted in series between the arc callout of the arc contact and the fixed side conductor. That is characterized.

In the invention according to claim 2, in the invention according to claim 1, the tracking means includes a spring and a support frame for freely supporting the spring to electrically connect the arc contact and the fixed-side contactor. It is characterized by.

The invention according to claim 3 is the invention according to any one of claims 1 and 2, wherein the inductance is a coil portion in which a conductor is wound in a coil shape.

Moreover, the invention which concerns on Claim 4 is connected to the fixed side conductor provided in the center conductor of one insulation spacer, and the said fixed side conductor in the sealing container which is divided into the insulation spacer which has a center conductor, respectively, and encloses insulating gas. A fixed side contactor, an arc contact provided inside the fixed side contactor, a fixed side shield disposed surrounding the fixed side contactor, the fixed side contactor and the arc contact, and the arc contact A movable member opened from the fixed-side contactor prior to the opening of the spring, a spring for following the arc contact to an axial movement during opening of the movable member, and freely supporting the spring so that the arc contact and the fixed side In a disconnector consisting of a support frame that electrically insulates a contact, the spring is Is characterized in that the work as an inductance which is electrically inserted in series between the contacts and the fixed side conductor.

According to the invention of the configuration of claims 1 to 3, the arc is arced to the arc contact, so that the portion of the fixed side shield is exposed to the arc. As a result, there is a possibility that the fixed side seal is deteriorated and consumed, and the insulation performance can be maintained.

In addition, since it is possible to reduce the possibility of arc arcing on the fixed side shield and prevent high voltage from being applied to the fixed side shield, maintaining insulation performance even if the distance between the fixed side shield and the metal container is short. It becomes possible. This makes it possible to further miniaturize the metal container.

Moreover, since the possibility that the part of a fixed side shield will be exposed to an arc is reduced, it becomes possible to comprise a fixed side shield by aluminum etc. which are inexpensive materials. As a result, the manufacturing cost can be reduced.

Further, since the arc is not fired on the portion of the fixed side shield, the fixed side shield can be covered with an insulating material. Thereby, it becomes possible to implement | achieve insulation improvement further. In addition, the insulation distance from the fixed side shield to the metal container can be further shortened, and the diameter of the metal container can be further reduced.

According to invention of the structure of Claim 4, it can manufacture easily by making an arc contact and a spring separately, and connecting each other in series. This leads to a reduction in the burden of manufacturing as compared with the invention of the configuration of claims 1 to 3 having the coil structure in the arc contact itself. Therefore, according to the invention of the structure of Claim 4, in addition to the effect of invention of Claims 1-3, the reduction of the number of manufacturing processes, and the manufacturing cost are attained.

1 is a cross-sectional view showing a state immediately after the opening of a disconnector according to one embodiment of the present invention;
2 is a cross-sectional view showing a closed pole state of a disconnector according to one embodiment of the present invention;
3 is a cross-sectional view showing an open state of a disconnector according to one embodiment of the present invention;
4 is an enlarged cross-sectional view of the disconnecting unit of FIG. 1;
5 (a) is a front view of the fixed side of the disconnection unit of FIG. 1 as seen from the movable side,
5 (b) is a front view of the movable side of the disconnection unit of FIG. 1 seen from the fixed side;
6 is an enlarged cross-sectional view of the arc contact used in the first embodiment;
7 is a diagram showing an example of a generated re-curve surge waveform;
8 is a diagram showing a surge waveform generated when an arc contact according to Example 1 is applied;
9 is a diagram showing a relationship between a surge voltage and a circuit impedance;
10 is a diagram showing a comparison of the potential of an arc contact and the potential of a fixed side shield in the present invention;
11 shows a comparison of dielectric breakdown voltage with and without electrode coating;
12 is a diagram showing a second embodiment of the disconnector according to the present invention;
13 is a diagram showing a third embodiment of the disconnector according to the present invention;
14 shows a fourth embodiment of the disconnector according to the present invention;
15 is an enlarged cross-sectional view of an arc contact used in a fourth embodiment;
Fig. 16 is a cross-sectional view of a disconnecting unit structure of a conventional disconnecting device in which an inductance coil is provided in series with a fixed side shield.

EMBODIMENT OF THE INVENTION Hereinafter, embodiment of this invention is described with reference to drawings.

(Example 1)

1 to 3 are cross-sectional views showing disconnectors which are one embodiment of the present invention. 1 shows the state immediately after the opening of the disconnector, FIG. 2 shows the closed electrode state of the disconnecting device, and FIG. 3 shows the opening state of the disconnecting device. 4 is an enlarged cross-sectional view of the disconnection unit of FIG. 1. 5 (a) is a front view of the fixed side of the disconnecting unit as seen from the movable side, and FIG. 5 (b) is a front view of the movable side of the disconnecting unit as seen from the fixed side. 6 is an enlarged cross-sectional view of an arc contact.

The disconnector of the first embodiment includes a metal container 1, a mover 2, an arc contact 3A, a spring 4, a fixed side contact 5a, a movable side contact 5b, and a fixed side shield 6a. ), Movable side shield 6b, fixed side conductor 7, movable side cylindrical conductor 8, insulating spacers 10a, 10b, operation rod 12, support frame 15A, high voltage conductor 17a And 17b), and the center conductors 18a and 18b.

The airtight container 1 is partitioned by arranging the insulating spacers 10a, 10b having the center conductors 18a, 18b to each other. The airtight container 1 is made of dry air or SF _6. An insulating medium such as gas is enclosed. In the sealed container 1, the high voltage conductors 17a and 17b connected to the center conductors 18a and 18b of the insulating spacers 10a and 10b are supported in an electrically insulated state from the sealed container 1. It is.

In the center conductor 18a of one insulating spacer 10a, the fixed side contact 5a is provided in the fixed side conductor 7 fixed to this, and is electrically connected. This fixed side contactor 5a is arrange | positioned so that the inner side of the front end may contact the outer side of the movable element 2.

The fixed side contact 6a for electric field relaxation is arrange | positioned at the fixed side contact 5a so that this outer periphery may be surrounded. The fixed side shield 6a is made of a conductive metal such as aluminum, and is coated with an epoxy-based insulating material or the like around it.

In addition, a spring 4 for supporting the support frame 15A and the arc contact 3A is provided inside the fixed side contact 5a to form a follower, and the shaft at the time of opening of the mover 2. The structure can follow the direction movement. The arc caller 21 located at the distal end of the arc contact 3A is configured to protrude from the distal end of the fixed-side contact 5a in the open state so that only the movable element 2 is contacted and energized just before the opening.

The movable side contactor 5b is supported by the center conductor 18b of the other insulating spacer 10b via the movable side cylindrical conductor 8 fixed to this, and this movable side contactor 5b and the fixed side contactor ( 5a) are facing each other. The movable side shield 6b for electric field relaxation is arrange | positioned at the movable contact 5b so that this outer periphery may be surrounded. This movable side shield 6b is comprised similarly to the fixed side shield 6a.

The movable element 2 is bridging so that opening and closing is possible between the fixed side contactor 5a and the movable side contactor 5b. The movable member 2 is connected to one end side of the insulation operating rod 12, that is, the free end side, so as to open and close the axis line. On the other end side of this insulation operating rod 12, the rotating shaft 19 which led out of the sealing container 1 is connected, maintaining airtightness. Moreover, the manipulator which is not shown in figure is connected to this rotating shaft 19. As shown in FIG.

In Example 1, in order to suppress generation | occurrence | production of a high frequency surge, one part of 3 A of arc contacts is comprised in the coil shape used as an inductance. The detail of this arc contact is shown in FIG. As shown in FIG. 6, the arc contact 3A includes an arc arcing portion 21 to which arcs are arced, a coil portion 22 wound around a coil to form a coil, and a contact portion in electrical contact with the support frame 15A ( 23, and a support insulation 24 supporting each of them in the winding of the coil.

During arc firing, the current flows through the arc firing portion 21, the coil portion 22, and the contact portion 23 to the support frame 15A and the fixed side conductor 7, so that each must be electrically connected. There is. It is preferable to use the arc-resistant alloy which added tungsten, chromium, etc. to copper for the part exposed to the arc of the arc arc part 21 in order to suppress consumption by an arc.

On the other hand, since the coil part 22 and the contact part 23 need to flow an electric current at the time of a surge occurrence, it is comprised from the electrically conductive metal material, such as copper, aluminum, or these alloys, for example. do. Moreover, the support insulation part 24 is comprised from the insulation material with sufficient strength, such as a FRP material and an epoxy resin, in order to support each said element.

The operation of the first embodiment will be described below. FIG. 2 shows the closed pole state of the disconnector, and FIG. 3 shows the open state of the disconnector. 1 has shown the state immediately after the opening of a disconnecting device.

In the closed electrode state shown in FIG. 2, the movable element 2 is in contact with the arc contact 3A and the fixed side contact 5a. In this case, an electric current flows between the fixed side conductor 7 and the movable side cylindrical conductor 8 via the fixed side contact 5a, the movable element 2, and the movable side contact 5b. Since the system current hardly flows in the coil portion 22 of the arc contact 3A, the loss due to inductance is very small.

In contrast, in the state immediately after the opening shown in FIG. 1, the current does not flow through the fixed contact 5a, but the current flows through the arc contact 3A. In the opening operation, the mover 2 slides in the direction of the insulating spacer 10b as the operation rod 12 rotates clockwise from the closed electrode state of FIG. 2.

At this time, the arc contact 3A is extruded by the spring 4 along the support frame 15A, thereby moving in an integral state with the mover 2 in the direction of the insulating spacer 10b of the metal container 1. do. When the mover 2 further moves, the contact between the fixed side contactor 5a and the mover 2 is dropped, and the mover 2 is in contact with only the arc contact 3A.

When the mover 2 moves in the direction of the insulating spacer 10b, the arc contact 3A is stopped at the end of the supporting frame 15A. Moreover, when the movable element 2 moves, as shown in FIG. 1, the contact of the arc contact 3A and the movable element 2 will fall, and it will be in the state which arc arcs.

4 shows a state in which the left end of the movable element 2 is displaced to the right end of the fixed side shield 6a. In this state, the gap d between the arc firing portion 21 and the tip of the movable element 2 is set to be smaller than the gap D between the movable element 2 and the fixed side shield 6a. .

In this dimensional relationship, the arc occurs in the small gap d, and does not occur between the fixed side shield 6a and the mover 2. Therefore, since the arc current only flows from the arc firing section 21 to the coil section 22, the crest value of the surge voltage due to the arc is suppressed by the inductance of the coil section 22.

When the mover 2 further moves in the direction of the insulating spacer 10b from the state of FIG. 1 and the insulation distance between the arc contact 3A and the mover 2 is sufficiently widened, discharge is not generated. The current is cut off. This results in an open state shown in FIG. 3.

FIG. 7 is a diagram showing an example of a re-curve surge waveform generated when a normal arc contact having no inductance is used. The vertical axis represents voltage (p. U.) And the horizontal axis represents elapsed time (ns). This figure shows that a high frequency voltage of several MHz or more is generated during surge generation. The peak value of the generated voltage depends on the circuit conditions, but a maximum of about 2.5 times the operating voltage may occur.

8, the surge waveform which arises when the arc contact which concerns on Example 1 is applied is shown. The vertical axis represents voltage (p.u.) and the horizontal axis represents elapsed time (ns). 8 shows surge waveforms generated under the same circuit conditions as in FIG. 7 except that the arc contact of the present invention is applied.

When comparing the surge waveforms shown in Figs. 8 and 7, respectively, the waveform of Fig. 8 is gentle due to the effect of the inductance of the arc contact. In other words, it can be seen that by suppressing the vibration waveform of the surge wave of the surge, it is possible to suppress the overvoltage generated during the opening operation of the disconnecting device and to prevent the degradation of the insulation performance.

9 shows the relationship of the surge voltage to the circuit impedance. The vertical axis represents surge voltage (p.u.) and the horizontal axis represents impedance (Ω). As can be seen from FIG. 9, when the impedance is 70? Or more, the surge voltage is 2 p.u. When the impedance is set to 200 Ω or more, the surge voltage is 1.5 p.u. It can be set as follows. 2 p.u. means that the earth voltage crest value is twice the operating voltage. That is, it is possible to reduce the surge voltage by increasing the impedance of the inductance applied to the arc contact.

As described above, the disconnector according to the first embodiment is configured to form a part of the arc contact 3A in the form of a coil for inductance, and the arc contact 3A has a structure in which a current flows only during the opening operation. As a result, the effect of inductance for realizing surge reduction acts only at the time of opening operation in which surge easily occurs. Therefore, it is possible to effectively suppress the high frequency surge voltage.

Moreover, since the coil part 22 is arrange | positioned at 3 A of arc contacts, compared with the case where the mechanism which suppresses a surge is provided separately, it is possible to realize a surge reduction effect and to ensure insulation performance, without increasing a disconnector. It becomes possible.

In addition, the invention of the present application has an advantageous effect as compared with the invention (hereinafter, referred to as a conventional example) in which an inductance coil is provided in series in the shield according to Patent Document 2 described above.

10 is a diagram illustrating a comparison between an arc contact potential and a shield potential in the present invention. The vertical axis represents the potential (p.u.) applied to each site, and the horizontal axis represents the impedance (Ω). Assuming that the impedance is 100Ω, the shield potential becomes about 1.3 p.u. while the arc contact potential is about 1.75 p.u. In addition, assuming that the impedance is 200?, The arc contact potential is about 1.5 p.u., whereas the shield potential is about 1.25 p.u.

That is, compared with the part of 3 A of arc contacts in which an arc generate | occur | produces, the shield potential of the fixed side shield 6a will fall large. In particular, the voltage drop becomes remarkable because a high frequency surge occurs during re-invocation. Since the arc contact 3A exists inside the fixed side shield 6a, even if the arc contact potential is high, the shield potential is lowered by the inductance. The insulation performance between the fixed side shield 6a and the earth can be ensured to satisfy the insulation performance between the high voltage portion and the earth (ground).

On the other hand, in the conventional example, since the arc is directly fired by the shield, the shield potential becomes the generation potential of the high frequency surge. Therefore, it is necessary to ensure sufficient insulation performance between the shield and the earth.

By the above, the disconnector which concerns on Example 1 can reduce the electric potential applied to the fixed side shield 6a compared with the conventional example, and ensures insulation performance. Moreover, the insulation distance from the fixed side shield 6a to the metal container 1 can be shortened, and the diameter of the metal container 1 can be reduced. For this reason, the size of the metal container 1 can be further reduced as compared with the conventional example.

Moreover, since the disconnecting device which concerns on Example 1 does not call an arc to the fixed side shield 6a, it becomes possible to comprise the fixed side shield 6a by aluminum etc. which are inexpensive conductive materials. On the other hand, when the arc is arced to the shield as in the conventional example, the shield cannot be made of aluminum, which is an inexpensive conductive material, and it is necessary to use an expensive metal material with little melting. Therefore, the disconnector which concerns on Example 1 can reduce manufacturing cost compared with a conventional example.

In addition, since the disconnecting device concerning Example 1 does not call an arc to the fixed side shield 6a, it becomes possible to coat the fixed side shield 6a with an insulating member. On the other hand, in the conventional example, even when the shield is covered with the insulating member, the shield is exposed to the arc, so that the coating melts and loses the effect of the coating in a short period of time.

It is a figure which shows the comparison of dielectric breakdown voltage with or without electrode coating. Here, an epoxy-based insulating material is used as the coating material, and insulation coating having a thickness of several hundred 탆 is performed. As can be seen from FIG. 11, the dielectric breakdown voltage is increased by about 20% when there is a coating, compared with the case where there is no coating. That is, when the fixed side shield 6a and the movable side shield 6b of FIG. 1 have an insulation coating, it is possible to reduce the distance between the poles and the earth distance by about 20% compared with the case where there is no insulation coating. Do.

In this respect, the disconnector according to the first embodiment can realize an improvement in insulation as compared with the conventional example. Moreover, it becomes possible to further shorten the insulation distance from the fixed side shield 6a to the metal container 1. Therefore, the diameter of the metal container 1 can be further reduced.

(Example 2)

EMBODIMENT OF THE INVENTION Below, 2nd Embodiment of the disconnector which concerns on this invention is described based on FIG. In addition, the same code | symbol is attached | subjected to the equivalent to FIG. 1, and detailed description is abbreviate | omitted.

12 is a fixed side enlarged cross-sectional view of the disconnector according to the second embodiment. In this configuration, a coil spring 16 is provided between the arc contact 3B and the fixed side conductor 7 without providing a coil in the arc contact portion, and a current flows through the coil spring 16. It is characterized by. That is, the structure makes it function as an inductance in which a surge reduction effect is made by flowing an electric current through the coil spring 16 at the time of a surge occurrence.

In this case, the support frame 15B for moving the arc contact 3B in the axial direction is made of an insulating material so that no current flows. At the time of the opening operation, a current is applied to the coil spring 16, the arc contact 3B, the mover 2, and the movable contactor 5b between the fixed-side conductor 7 and the movable-side cylindrical conductor 8. Will flow. This makes it possible to reduce the surge generated.

The structure concerning Example 2 can be manufactured by making the arc contact 3B and the coil spring 16 separate, respectively, and connecting each other in series. That is, the structure concerning Example 2 can be manufactured easily compared with the structure which has the coil part 22 in 3 A of arc contacts itself like Example 1. Therefore, in addition to the effect of the structure of Example 1, the effect of reducing manufacturing cost and manufacturing process number is produced.

(Example 3)

EMBODIMENT OF THE INVENTION Below, 3rd Embodiment of the disconnector which concerns on this invention is described based on FIG. In addition, the same code | symbol is attached | subjected to the equivalent to FIG. 1, and detailed description is abbreviate | omitted.

The structure of Example 3 shown in FIG. 13 has the structure which the arc contact 3C is supported only by the coil spring 16, compared with the structure of Example 2 mentioned above, omitting the support frame 15B. There is a characteristic.

By omitting the support frame 15B, the length obtained by combining the arc contact 3C and the coil spring 16 according to the third embodiment can be made substantially the same as the length of the arc contact 3B according to the second embodiment. Thereby, compared with the structure which concerns on Example 2, the structure which concerns on Example 3 can shorten the length of each of the arc contact 3C, the fixed side contact 5a, and the fixed side shield 6a. As a result, the axial length of the metal container 1 can be shortened.

In addition, by omitting the support frame 15B, it is possible to reduce the number of parts, the number of manufacturing steps, and the manufacturing cost, as compared with the configuration according to the second embodiment. In addition, in the structure of Example 3, the recessed part which can fix 3 C of arc contacts may be provided in the front-end | tip of the movable element 2. Thereby, even if the support frame 15B is omitted, while the arc contact 3C and the mover 2 are in contact, the arc contact 3C can be reliably moved on the center axis of the mover 2. It becomes possible. Moreover, it is preferable that the shape of a recessed part is a shape which has arbitrary curvatures in order to relieve the electric field of the angled part.

(Example 4)

Below, 4th Embodiment of the disconnector which concerns on this invention is described based on FIG. In addition, the same code | symbol is attached | subjected to the equivalent to FIG. 1, and detailed description is abbreviate | omitted. The configuration of FIG. 14 is characterized in that it has a structure in which a magnetic substance is provided in the arc contact 3D.

15 is an enlarged cross-sectional view of the arc contact 3D of the disconnector according to the fourth embodiment. This arc contact 3D is comprised from the arc arc part 21, the magnetic body part 25, the contact part 23, and the conductor 26 which connects the arc arc part 21 and the contact part 23. As shown in FIG. When the arc is arced by the arc caller 21 at the time of opening and closing, a current flows through the support frame 15C and the fixed side conductor 7 through the arc caller 21, the conductor 26, and the contact 23. .

The magnetic body portion 25 is arranged in a cylindrical shape around the conductor 26, and when a high frequency current due to surge flows in the conductor 26, it converts it into thermal energy to reduce the high frequency current. As the magnetic permeability 25 increases, the magnetic resistance increases at high frequencies as the magnetic permeability increases, and the magnetic flux to be exited is converted into thermal energy to reduce the high frequency signal.

Iron, ferrite, silicon steel sheet, etc. are mentioned as a high permeability material used for the magnetic body part 25. As shown in FIG. By arranging these materials in the portion of the arc contact 3D, an effect equivalent to the inductance described in Embodiments 1 to 3 can be expected.

In addition, the structure which concerns on Example 4 can be manufactured easily by arrange | positioning the magnetic body part 25 to the periphery of the conductor 26 in a cylindrical shape. The structure concerning Example 4 has the effect that manufacture is easy compared with the structure of Examples 1-3. It is also possible to reduce the number of manufacturing steps.

Claims

A fixed side conductor provided in the center conductor of one insulating spacer, a fixed side contactor connected to said fixed side conductor, and said fixed side contactor in a sealed container partitioned by an insulating spacer having a center conductor, respectively, to enclose insulating gas. An arc contact provided in the inner side, a fixed side shield disposed surrounding the fixed side contactor, the fixed side contactor and the arc contact in contact with each other, and prior to the opening of the arc contact. A disconnector comprising a mover opened from the fixed side contactor and a tracking means for following the arc contact to an axial movement during opening of the mover,
And an inductance electrically inserted in series between the arc callout portion of the arc contact and the fixed side conductor.

The method of claim 1,
And said tracking means comprises a spring and a support frame for movably supporting said spring to electrically connect said arc contact and said fixed side contactor.

3. The method according to claim 1 or 2,
The inductance is a disconnector, characterized in that the coil wound around the conductor in a coil shape.

A fixed side conductor provided in the center conductor of one insulating spacer, a fixed side contactor connected to said fixed side conductor, and said fixed side contactor in a sealed container partitioned by an insulating spacer having a center conductor, respectively, to enclose insulating gas. An arc contact provided in the inner side, a fixed side shield disposed surrounding the fixed side contactor, the fixed side contactor in contact with the fixed side contactor and the arc contact, and prior to the opening of the arc contact. A movable frame opened from the spring, a spring for following the arc contact to the axial movement during opening of the mover, and a support frame for electrically insulating the arc contact and the fixed side contactor by freely supporting the spring. In the disconnector which consists of,
And the spring acts as an inductance inserted in series between the arc callout of the arc contact and the fixed side conductor.