JP2002008500A - Vacuum chamber - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a miniaturized vacuum switch gear which equips a mean of suppressing generation of heat efficiently. SOLUTION: The vacuum switch gear comprise insulating spacers 105A, 105B having a large electric resistance and arranged around electrodes. A heat generated around the electrodes while electric current flows is released through the insulating spacers 105A, 105B to the outside of the vacuum switch gear efficiently.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vacuum switchgear in which one or more of a conductor, a circuit breaker, a disconnector, a load switch, and a grounding device are assembled, or a vacuum vessel containing a conductor.

[0002]

2. Description of the Related Art The power consumption in urban areas is concentrated in some areas, and in response to the increasing demand for power consumption, it is difficult to locate distribution substations and there is not enough room for distribution piping. In response to demands for higher utilization of supply facilities, the distribution voltage is boosted, that is, by increasing the capacity per line, it is possible to actively absorb the load in a high voltage system.
This leads to the formation of efficient power supply facilities. For this purpose, it is necessary to further reduce the size of distribution equipment and power receiving and transforming equipment. As substation equipment for downsizing,
For example, SF described in JP-A-3-273804
A six gas insulated switchgear is conceivable.

In this switchgear, a circuit breaker, two disconnectors, and a grounding switch are individually manufactured and housed in a unit room and a bus room in which a distribution box is filled with insulating gas. When using a vacuum circuit breaker as a circuit breaker, the movable electrode moves up and down with respect to the fixed electrode by the operation mechanism of the vacuum circuit breaker,
Turn on and off.

Further, as in a vacuum circuit breaker described in Japanese Patent Application Laid-Open No. 55-143727, a movable electrode is rotated left and right around a main shaft to contact and separate from a fixed electrode, and is turned on and off. There are also things. By the way, in the SF6 gas insulated switchgear, when dielectric breakdown occurs in the gas container, the pressure inside the container increases due to generation of an arc, and there is a danger of explosion. Therefore, in response to a demand for increasing the internal pressure, the thickness of the steel plate constituting the container increases, and the price increases accordingly. We also avoid using it in places where there are many traffic such as shoulders.

In response to this problem, Japanese Patent Application Laid-Open No. H11-417
As a switchgear described in Japanese Patent Publication No. 26, there is proposed a switchgear in which an opening / closing unit is housed in a grounded vacuum vessel. The thickness of the vacuum vessel is such that it can withstand atmospheric pressure (about 1).
mm), and up to a rated voltage of 72 kV, which has a higher dielectric strength than SF6 gas.

[0006]

However, the above switchgear has a problem of heat radiation efficiency. The Joule heat generated in each part when energized is locally radiated by the cable head at the end of the vacuum vessel connected to the fixed electrode or the movable electrode. In addition, since the internal conductor temperature increases, thermionic emission is promoted, and the insulation performance decreases. To suppress heat generation, increase the conductor size to lower the current density, or apply a higher contact pressure to the electrodes in the open / close section,
The contact resistance must be reduced. Therefore, there is a drawback that the whole device is enlarged, the operation mechanism requires a larger driving force, and the device is eventually enlarged.

An object of the present invention is to provide a more compact vacuum switchgear by providing means for effectively suppressing heat generation in a vacuum vessel.

[0008]

According to the present invention, a radiating insulating spacer made of a ceramic member is arranged between a conductor connected to a heat generating source and a vacuum vessel, and the radiating insulating spacer is transmitted to the conductor by the radiating insulating spacer. The heat is released outside the vacuum vessel.

Further, according to the present invention, an insulating layer is provided on a lead conductor drawn out of a vacuum vessel, a conductive layer provided on the insulating layer is grounded, and an induced current due to a magnetic field generated by a current flowing through the conductor is generated in the vacuum vessel. A circulating current that circulates from the ground on one side to the ground on the other side from between the surface and the conductive layer,
The heat generated by the circulating current is suppressed by the stopping means provided at a part between the surface of the vacuum vessel and the conductive layer.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. The circuit diagram of FIG. 1 shows the overall configuration of the collective switchgear of the present invention. FIG. 2 is a front view of the collective switchgear, and FIG. 3 shows a cross section of the switchgear for one phase.

First, the configuration of the collective switchgear 100 will be described with reference to FIGS. The collective switchgear 100 includes a plurality of circuits, for example, switchgears 1, 2, 3 for three circuits in FIG. The circuit switch gears 1, 2, 3 of each phase are connected to each other by buses 8X, 8Y, 8Z in the bus unit 8.

The circuit switchgear 1 includes a power supply side cable 11
Thereby, it is electrically connected to the external system power supply 12. The circuit switchgear 2 is connected to a load 13, and the circuit switchgear 3 is connected to a system power supply 14. The circuit switchgears 1, 2, 3 enable two-line power reception switching or loop power reception. The circuit switchgear 3 is connected to a load. The connection of the power supply and the load may be selected in any circuit switch gear, and may be determined in consideration of the cable lead-in state at the installation location.

Since the structures of the circuit switch gears 1, 2 and 3 of each phase are the same, the second circuit switch gear 2 will be described below.
And the description of the other circuit switchgears 1 and 3 is omitted. Also, since the configurations of the phase switch gears 2X, 2Y, and 2Z constituting the circuit switch gear 2 are also the same,
Only the first-phase phase switch gear 2X will be described, and description of the other phase switch gears 2Y and 2Z will be omitted.

The phase switch gear 2X has a shut-off function, a disconnection function, and a ground opening / closing function integrally housed in a vacuum vessel. That is, the phase switch gear 2 </ b> X mainly includes three parts, that is, the breaking part 5, the disconnecting part 6, and the grounding opening / closing part 7. The breaking unit 5 is connected to the bus 8X of the bus unit 8. The grounding switch 7 is connected to the load-side conductor 21, and the load-side conductor 21 is connected to the cable head 10 extending outside the vacuum vessel. The cable head 10 is connected to a load 13.

The detailed configuration of the phase switch gear 2X will be described with reference to FIGS. Electrical devices such as the shut-off unit 5, disconnecting unit 6, and ground opening / closing unit 7 of the phase switch gear 2X are arranged in the vacuum vessel 60. The vacuum vessel 60 is composed of two vacuum vessel sections 40 and 41. Vacuum container part 4 on one side
The shut-off unit 5 is housed in the vacuum vessel unit 41, and the disconnecting unit 6 and the grounding opening / closing unit 7 are housed in the vacuum vessel unit 41 on the other side. Vacuum container section 40,
41 is spatially separated by a ceramic insulating partition plate 42. The insulating partition plate 42 is made of a disc-shaped ceramic having a high thermal conductivity. A through hole that penetrates the connection conductor 52 is formed inside the insulating partition plate 42.

In the operation procedure, for example, when the load 13 connected to the circuit switchgear 2 is cut off, the current is cut off by the cutoff operation of the cutoff section 5 and the disconnection section 6 is cut off to apply a high voltage such as lightning. So that the load side is not affected. Further, at the time of maintenance / inspection on the load side, the breaking section 5 and the disconnecting section 6 are opened, and the grounding opening / closing section 7 is turned on to secure the safety of the worker. In any case, after the circuit is disconnected from the system, the circuit is insulated at the two locations of the interrupting section 5 and the disconnecting section 6 housed in the individual vacuum vessel sections 40 and 41.

As in the present invention, by completely separating the vacuum vessel sections 40 and 41 into two, even if one of the vacuum vessel sections 40 causes a vacuum leak, the other vacuum vessel section 41 may be used. As a result, the safety of the worker can be secured without flashing on the load side.

The vacuum vessel section 40 includes a metal tube 43, an insulating partition plate 42, a busbar bushing 44, an end plate 45, and a bellows 4.
8A is formed by brazing in a vacuum furnace. Metal tube 4
Reference numeral 3 is used to connect a ground line E to a ground potential to ensure safety even when an operator touches the power supply. A shut-off chamber 47 is provided inside the vacuum vessel section 40. The shut-off chamber 47 is provided with the insulating partition plate 4.
2. Intermediate shield 49 and ceramic insulating plate 50
The structure is separated from the space outside.

FIG. 4 shows details of the mounting portion of the intermediate shield 49. The intermediate shield 49 and the metal cylinder 43 are brazed to metallizations 51A and 51B provided on the insulating partition plate 42, respectively. Metallizations 51A and 51B are electrically insulated. As a result, the intermediate shield 49 has a floating potential. The reason why the cutoff chamber 47 is separated from other spaces is that charged particles (ions and electrons) generated at the time of cutoff are further separated from the cutoff chamber in order to prevent an arc generated at the cutoff from directly touching the vacuum vessel and causing a ground fault. 47 to prevent dielectric breakdown between the main circuit and the metal tube 43 at the ground potential.

The outer peripheral portion P of the insulating partition plate 42 is in an electrically floating state, and is in a state in which electric charges are accumulated when electricity is supplied. In order to ensure safety, it is only necessary to approach the ground potential. Specifically, as shown in FIG. 4, if the metallization 51B is applied to the outer peripheral end of the insulating partition plate 42, and the distance L1 from the metal cylinder 43 to the outer peripheral end is made larger than the thickness t of the insulating partition plate 42, Good. At this time, the outer peripheral end P is swept away from the connection conductor 52 to which the power is applied and is shielded by the metal cylinder 43 at the ground potential and the metallization 51B, so that there is almost no charge storage. The insulating partition plate 42 also has a role of avoiding a circulating current generated at the time of energization, and this point will be described later.

The interruption is performed by opening and closing the fixed electrode 5a and the movable electrode 5b of the interruption section 5. The fixed electrode 5a of the blocking unit 5
It is fixed to a connection conductor 52 extending to the vacuum container section 41 containing the disconnecting section 6 and the grounding opening / closing section 7. The movable electrode 5b of the blocking unit 5 is connected to the movable blade 5c via the movable conductor 5d and the insulating rod 101A made of ceramic. The movable blade 5c is driven by an operation mechanism (not shown) in the operation unit 30 to open and close the electrodes. Movable blade 5c
Is connected to the end plate 45 via the bellows 48A so that the movable electrode 5b of the blocking unit 5 can be operated while maintaining the degree of vacuum.

One of the flexible conductors 53A is fixed to the movable conductor 5d, and the other is connected to the busbar-side conductor 9. Electric conduction from the busbar side conductor 9 to the cutoff section 5 is enabled by the flexible conductor 53A via the movable conductor 5d. The bus-side conductor 9 passes through the ceramic bus-side bushing 44 and is connected to the lead conductor 8B of the bus unit 8. The lead conductor 8b is provided on the insulating layer 8A covering the periphery thereof with a conductive layer C.
And grounded by a ground line E1 connected to the conductive layer C.

The vacuum vessel section 41 comprises a vacuum vessel 60 which is a grounded metal cylinder, a load-side bushing 61, a voltage measurement bushing 71, a load-side conductor 21, an insulating partition plate 42, and a connection conductor 52. The disconnecting section 6 and the ground opening / closing section 7 are housed inside the vacuum vessel section 41.

The fixed electrode 6a of the disconnecting section 6 is fixed to a connecting conductor 52 extending to the vacuum container section 40 in which the blocking section 5 is housed, and the movable conductor 6b of the disconnecting section 6 which is opposed to the movable conductor 6 is movable via an insulating rod 101B made of ceramic. It is connected to the blade 6c. The flexible conductor 53 is provided on the movable electrode 6b of the disconnecting portion 6.
One of B is fixed, and the other is fixed to the connection conductor 54. The connection conductor 54 penetrates a ceramic voltage measurement bushing 71 and is connected to a voltage measurement capacitor 72. The load conductor 21 branches off in the connection conductor 54.

In the vacuum switchgear of this embodiment, the current detecting current transformer 200 is provided around the vacuum vessel section 40.
It is possible to realize functions such as overcurrent detection and, in addition, a power amount detection in combination with the voltage measurement capacitor 72. The fixed electrode 7a of the grounding switch 7 is fixed to the connection conductor 54, and the movable electrode 7b of the grounding switch 7 is connected to the movable conductor 7d. The movable conductor 7d is short-circuited in the operation unit 30 with the movable conductor 7d of the ground switchgear 7 in another phase switchgear or circuit switchgear, and is grounded by the ground line E.

The movable blade 6c of the disconnecting section 6 and the movable conductor 7d of the grounding opening / closing section 7 are connected to bellows 48B and 48C, one of which is connected to the vacuum vessel, and
With the operation mechanism within 0, the operation can be performed while maintaining the degree of vacuum.

The bus unit 8 includes buses 8X, 8 of each phase.
The insulating layers 8A and 8Z are formed by molding an insulating layer 8A with an insulating resin such as epoxy. A conductive layer C coated with a conductive paint is grounded by a ground line E1 around the periphery thereof, and is fixed at a ground potential. The outer shape of the insulating layer 8A of the busbar unit 8 and the facing bushing 44 made of ceramic and the insulating plug 62a are conical, and the size is set to a size that can be attached to a standard cable head.

Next, a method of attaching the bushing around the vacuum vessel 60 and its peripheral members will be described.

The basic concept of the vacuum switchgear of the present invention is to connect a cable, and the busbar bushing 44, the load bushing 61, and the voltage measurement bushing 71 extending from the vacuum vessel 60 can be connected to a standard cable head. There is a conical structure. A screw 9a is provided at the end of the bus-side conductor 9 that penetrates the bus-side bushing 44, and the insulating plug 62a is tightened with the lead-out conductor 8b extending from the bus unit 8 held therebetween. At this time,
Bus-side bushing 44, insulating layer 8A of bus unit 8,
The insulating plug 62a is in close contact with the cable head connecting portion 63a made of insulating rubber, and maintains insulation with this contact pressure. The load side bushing 61 is connected to the power cable 11 integrated with the rubber cable head connecting portion 63b by an insulating plug 62b (cable head 10). The connection is performed in a manner similar to that of the busbar side, in which the insulating plug 62b is tightened.

That is, the cable head connecting portion 63a integrally forms the insulating layer 8A, the busbar side bushing 44, and the three storing portions for storing the insulating plug 62a. After the insulating layer 8A and the busbar bushing 44 are stored in these storage sections, the insulating plug 62a is stored. A screw 9a is inserted into a through hole provided in a storage portion for storing the insulating plug 62a.
a is formed with a female screw 62Z. The female screw 62Z is fixed to the screw 9a by rotating the insulating plug 62a.

The voltage measuring bushing 71 is connected to an insulating plug 62c formed by molding a voltage measuring capacitor 72 with an insulating resin such as epoxy. The connection method is based on the bus-side bushing 44 and the load-side bushing 6.
1, the cable head connection portion 63b
The voltage measurement bushing 71 and the insulating plug 62c are stored in the two storage portions. The conductive layer C on the surface of the voltage measurement bushing 71 and the cable head connection portion 63b is connected to the ground line E.
To fix to the ground potential.

If the bus-side bushing 44, the load-side bushing 61 and the voltage measurement bushing 71 are made of the same ceramic, the power cable 11, the bus-bar unit 8, the voltage It is only necessary to consider where to connect the measuring capacitor 71, and the switchgear can be made versatile.

Next, a method of radiating heat using the ceramic spacer of the present invention and its effects will be described.

An insulating spacer 105A and a connecting conductor 54 provided between the connecting conductor 52 in the vacuum container 41 and the vacuum container 60.
An insulating spacer 105B provided between the vacuum chamber 60 and the vacuum vessel 60 is provided as a heat radiating means simultaneously with the mechanical support of the connection conductors 52 and 54. That is, since heat generated during energization is radiated to the outside through the insulating spacers 105A and 105B, local heating of the cable head provided at the end of the vacuum vessel can be suppressed, and the emission of thermoelectrons from the internal conductor is reduced. As a result, the insulation characteristics are improved. Note that the insulating spacers 105A, 1
05B is connected to the connection conductors 52 and 54 and the vacuum vessel 60 via the fittings 107A and 107B. Hardware 107
A and 107B are best made of copper having a high thermal conductivity, but stainless steel having excellent dielectric strength may be used in order to reduce the size.

The insulating spacers 105A and 105B are provided near the disconnecting portion 6, near the grounding opening / closing portion 7 and the flexible conductor 53B. Insulating spacers 105A, 105B
Is provided in a portion having a particularly high electric resistance, that is, in the vicinity of the contact surfaces of the switching electrodes and the flexible conductors 53A and 53B, heat radiation efficiency is improved. Insulating spacer 105
A and 105B are provided to face the fixed electrode 6a of the disconnecting section 6 and the fixed electrode 7a of the grounding opening / closing section 7, respectively. This is to cope with the bending force acting on the connection conductors 52 and 54 by the contact force of the electrodes when the disconnecting portion 6 or the grounding opening / closing portion 7 is in the on state.

Heat sinks 106A and 106B are provided in the vacuum vessel 60 facing the insulating spacers 105A and 105B. This is to prevent the outer surface of the vacuum vessel 60 from being locally heated, and further to increase the internal heat radiation efficiency. If the heat is sufficiently released by natural cooling by the atmosphere, these heat sinks are not necessary. The heat generated at the electrode contact surface of the blocking unit 5 is radiated through the insulating partition plate 42.
Therefore, the temperature inside the vacuum vessel 60 is reduced, and the size of the vacuum switchgear can be reduced.

The insulating spacers 105A and 105B and the insulating partition plate 42 need to have a high thermal conductivity for heat radiation and have a high melting point material (1000 ° C.) that can withstand the sealing of the vacuum vessel 60 in a vacuum furnace. Above). Therefore, it is appropriate to use ceramics, and alumina, beryllia, magnesia and the like are excellent as additives. The thermal conductivity of each ceramic was 36.0 W / m2 of alumina ceramic.
K, beryllia ceramic 272W / mK, magnesia 4
At 8.4 W / mK, the thermal conductivity of the stainless steel 304 is larger than that of, for example, 16.0 W / mK. Other high thermal conductivity materials such as silicon carbide SiC and beryllium oxide Be
O ₇ or the like may be used.

As described above, the insulating spacers 105A and 105B made of ceramic having high thermal conductivity and the insulating partition plate 4 are provided.
2, the heat source at the time of opening / closing of the cutoff unit 2, the disconnecting unit 6, and the grounding switch 7 is transmitted to the insulating spacers 105A and 105B and the insulating partition plate 42 via the connection conductors 52 and 54. The heat is radiated from the insulating spacers 105A and 105B and the insulating partition plate 42 to the outside of the vacuum vessel, and the temperature inside the vacuum vessel can be reduced.

When stainless steel 304 is used for the vacuum container 60, ceramics having better thermal conductivity than the stainless steel 304 is used for the insulating spacers 105 A and 105 B and the insulating partition plate 42. Then, for example, when the fixed electrodes 6a, 7a are brazed to the connection conductors 52, 54 in a vacuum furnace, the surface of the vacuum vessel is at a higher temperature than in the vacuum vessel due to radiant heat in the vacuum furnace. Since the temperature inside the vacuum vessel is not so high, it takes a long time to braze.

However, as in the present invention, the insulating spacer 10
Since the thermal conductivity of 5A, 105B and the insulating partition plate 42 is better than the thermal conductivity of stainless steel 304, the radiant heat in the vacuum furnace is reduced by the insulating spacers 105A, 105.
B and the insulating partition plate 42 to conduct the connection conductors 52 and 5.
The temperature at the brazing point between the electrode 4 and the fixed electrodes 6a, 7a can be increased, and the brazing time can be shortened.

On the other hand, the insulating partition plate 42 has not only the heat dissipation but also the effect of suppressing the circulating current described below. The collective switchgear 100 includes, for example, a busbar-side conductor 9, a cutoff section 5, a disconnection section 6, a ground switch 7, and a connection conductor 5 in a vacuum vessel.
2, 54, when a current flows through the load-side conductor 21, the induced current due to the magnetic field generated by the conduction current is applied to the conductive layer C of the insulating layer 8A of the busbar unit 8, as shown in FIG.
Flows from the ground line E1 provided through the ground to the ground line E2 provided on the conductive layer C of the insulating layer of the load side bushing 61, and further flows from the ground line E2 to the surface of the vacuum vessel 60 via the conductive layer C. A so-called circulating current I flows. When the vacuum container 60 is made of, for example, a stainless steel member having a high resistivity, heat is generated on the surface of the container by the circulating current I, thereby deteriorating the internal insulating characteristics, further causing power loss, or causing the insulating spacers 105A, 105B, and The effect of dissipating heat by using ceramics having good thermal conductivity of the insulating partition plate 42 is lost.

Therefore, in the present invention, the vacuum vessel 60 is divided into two vacuum vessel sections 40 and 41, and an insulating partition plate 42 is arranged between the vacuum vessel section 40 and the vacuum vessel section 41, so that the circulating current I Flow is prevented so that heat is not generated in the vacuum vessel 60, so that the temperature inside the vacuum vessel 60 is further reduced, and the size of the vacuum switchgear can be reduced.

Further, as shown in FIG.
1, bushing 71 for voltage measurement, bushing 44 on the busbar side
The flange portion which is a part of the conductive layer C has an insulating portion F in which the conductive layer C is not provided. The insulating portion F prevents the flow of the circulating current I. When the insulating portion F is provided, the insulating partition plate 42 may be omitted. In particular, if the flange portion is made of the insulating portion F, the worker can easily find the insulating portion at the time of work, and work is easy, and if the conductive layer C is provided on the protrusion of the flange portion, the tool of the worker during the work can be obtained. However, there is a possibility that the flange will contact the ceramic without being noticed and be damaged. If the insulating portion F is not provided on the flange portion, a separate insulating means may be provided on a part of the conductive layer C between the ground wire and the vacuum vessel 60 so as to prevent the flow of the circulating current I.

If the flow of the circulating current I is electrically insulated by the insulating partition plate 42 or the insulating portion F in this manner, the circulating current does not flow, and the above-described problem can be avoided. Further, as described above, the vacuum vessel sections 40 and 41 are divided into two, and the cutoff section 5 and the disconnection section 6 are arranged in each of the vacuum vessel sections 40 and 41, and the induced current of each of the vacuum vessel sections 40 and 41 is grounded. The line E was grounded, and the safety of the worker was ensured so that even if the worker touched each of the vacuum vessel sections 40 and 41, no electric shock would be caused. In this case, when providing the insulating partition plate 42 in the vacuum container 60,
The vacuum vessel 60 is grounded via two ground lines E, and circulating currents I2 and I3 flow in two paths. This circulating current I2,
Since I3 is blocked by the insulating portion F of the conductive layer C, no heat is generated in the vacuum vessel 60.

When the current is large and the current time change rate di / dt is high, the induced voltage given by the product of the inductance L of the path through which the circulating current I flows and the current time change rate di / dt. It is conceivable that Ldi / dt is applied to the insulating partition plate 42 to cause a discharge. In this case, the vacuum vessel section 40 and the vacuum vessel section 41 must be electrically connected, but a conductive layer C having a high electric resistivity is used for the conductive section on the surface of the busbar unit 8, or the coating thickness is reduced. May be limited to reduce the circulating current I.

In the phase switch gear 2 shown in FIG. 6, a breaking part 5, a disconnecting part 6, and a grounding opening / closing part 7 similar to those described above are connected to a conductor 101 disposed inside each of the three-phase vacuum vessels 60. I have. Each of the conductors 101 is a bus 8X of the bus unit 8,
8Y and 8Z. The busbars 8X, 8Y, 8Z are covered with an insulating layer 8A. The insulating layer 8A grounds the ground line E connected to the conductive layer C of the insulating layer 8A in the same manner as described above with reference to FIG. The load side conductor 101 is the cable head 10
To a load (not shown).

The circulating current I flows from the ground line E2 of the vacuum vessel 60 on one side to the ground line E3 on the other side, and flows from the ground line E3 to the conductive layer C on the busbar side via the vacuum vessel 60 on the other side. In the present invention, an insulating partition plate 42 is arranged between the vacuum vessel 50 and the vacuum vessel section 41 which divide the vacuum vessel 60 to prevent the flow of the circulating current I, reduce the temperature of the vacuum vessel, and reduce the size of the vacuum switchgear. It is trying to make it. A circulating current also flows from the ground line E1 or E2 to the ground line E, but the insulating portion F prevents the circulating current from flowing.

FIG. 7 shows a state in which the conductor 101 is disposed in the vacuum vessel 60 and the conductor 101 is provided with the interrupter 5, the disconnector 6, and the grounding switch 7.
3 is the same as the embodiment of FIG. 3 except that it is not connected, so that the detailed description is omitted. Inside the vacuum vessel 60 and the conductor 10
1, an insulating spacer 105A is arranged between the first and second heat dissipating plates, and a heat radiating plate 10
6A is attached, the heat inside the vacuum vessel is radiated, and the temperature inside the vacuum vessel is reduced, thereby reducing the size of the vacuum vessel. In addition, an insulating partition plate 42 is arranged between the vacuum vessel divided into the vacuum vessel 60 and the vacuum vessel to prevent the flow of the circulating current I, further reduce the temperature in the vacuum vessel, and reduce the size of the vacuum vessel. I have.

[0049]

As described above, according to the present invention, the temperature of the vacuum vessel can be reduced, and the size of the vacuum vessel containing the vacuum switchgear or the conductor can be reduced.

[Brief description of the drawings]

FIG. 1 is a circuit diagram of a switchgear according to an embodiment of the present invention.

FIG. 2 is a front view of a switchgear according to the embodiment of the present invention.

FIG. 3 is a sectional view of a phase switchgear according to an embodiment of the present invention.

FIG. 4 is a sectional view of the vicinity of an insulating partition plate 42 of the switchgear according to the embodiment of the present invention.

FIG. 5 is a schematic diagram illustrating a circulating current in FIG. 3;

FIG. 6 is a front view of the switchgear of FIG. 3 as viewed from the left side.

FIG. 7 is a schematic view of a vacuum container containing a conductor according to another embodiment of the present invention.

[Explanation of symbols]

1, 2, 3 ... circuit switch gear, 2X, 2Y, 2Z ... phase switch gear, 5 ... cutoff part, 5a ... fixed electrode, 5b ... movable electrode, 6 ... disconnection part, 6a ... fixed electrode, 6b ... movable electrode, Reference numeral 7: grounding switch, 7a: fixed electrode, 7b: movable electrode, 8: busbar unit, 9: load-side conductor, 10: cable head, 30: operating mechanism, 40, 41: vacuum vessel part,
42: insulating partition plate, 53: flexible conductor, 60: vacuum container, 105A, 105B: insulating spacer, 106
A, 106B: heat sink, 100: collective switchgear,
C: conductive layer, F: insulating part.

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Takuya Midai 1-1-1, Kokubuncho, Hitachi City, Ibaraki Prefecture Inside Kokubu Office, Hitachi, Ltd. (72) Inventor Shuichi Kikugawa 1-1-1, Kokubuncho, Hitachi City, Ibaraki Prefecture No. 1 Hitachi Kokubu Office Hitachi, Ltd. (72) Inventor Toru Tanimizu 1-1-1, Kokubuncho, Hitachi City, Ibaraki Prefecture F-term (reference) 5G017 CC02 FF06 5G026 EB06 EB08

Claims (8)

[Claims] 1. A conductor connected to a heat generating source is disposed in a container, and the conductor is supported by a heat-radiating insulating spacer made of a ceramic member so as to release heat transferred to the conductor to the outside of the container. A vacuum vessel characterized by the above. 2. A conductor disposed in a grounded vacuum vessel is partially drawn out of the vacuum vessel, an insulating layer is provided around a portion where the conductor is drawn out of the vessel, and a conductive layer covering the insulating layer is provided. A blocking means is provided for grounding the layer, and for preventing a circulating current flowing by circulating an induced current due to a magnetic field generated by a current flowing through the lead conductor between the surface of the vacuum vessel and the conductive layer and the ground. A vacuum vessel, characterized in that: 3. The conductor is formed such that a fixed electrode disposed in a vacuum vessel and a movable electrode that opens and closes the fixed electrode face each other, and an opposing surface of the conductor, the fixed electrode, and the movable electrode. The vacuum switch is constituted by a lead conductor drawn out of the vacuum vessel from the opposite side of the vacuum switch.
The vacuum container according to item 1. 4. The vacuum vessel according to claim 2, wherein an insulating means for preventing a circulating current is provided in a part of the vacuum vessel or the conductive layer as the blocking means. 5. As the insulating means, an insulating plate having a through hole penetrating the conductor is provided between the divided one vacuum vessel and the other vacuum vessel by dividing the vacuum vessel. The vacuum vessel according to claim 4, wherein the vacuum vessel is arranged so as to be in contact with the conductor. 6. A breaking part is provided in one of the divided vacuum vessels, a disconnecting part and a grounding switch part are provided in the other vacuum vessel, and the conductor passes through a through hole of the insulating plate. The vacuum vessel according to claim 5, wherein the vacuum vessel is electrically connected to the breaking section and the disconnecting section. 7. The heat-dissipating insulating spacer is provided on at least a pair of opposed fixed electrodes and a movable electrode provided on a conductor arranged in a vacuum vessel and a side on which the fixed electrode is provided. The vacuum vessel according to claim 1, wherein the vacuum vessel is provided on an opposite conductor. 8. A radiator plate is provided outside the vacuum vessel facing the insulating spacer for radiating heat.
8. The vacuum container according to 7.