JP2001312948A - Switching device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a switching device which eliminates both the generation of a cracked product and cracked gas and exhaust of SF6 gas by using no SF6 gas, proceeding with compact designing and cost reduction and which conforms to environmental harmony. SOLUTION: A silicon oil 62 is filled in the metal container 61, which is electrically grounded, and also the circuit breaker 60 is incorporated therein. Two vacuum valves 70a, 70b connected electrically in series are provided in the circuit breaker 61 facing each other. Each of the vacuum valves 70a, 70b is provided with one pair of the fixed side electrode 73a and the movable side electrode 73b, both of which are able to make contact with and separate, and with an arc shield 77 which surrounds the one pair of the electrodes 73a, 73b.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a switchgear in harmony with the environment.

[0002]

2. Description of the Related Art In recent years, the construction cost of substation facilities and the cost of land acquisition have been increasing. However, in the case of a 500 kV class switchgear, in addition to this, contamination of a charged part, safety, noise, and the like become problems. I have. Therefore, downsizing and sealing of the switchgear are required, and gas-insulated switchgears have been developed to meet this demand. In the gas insulated switchgear, each electric device is housed in a pipe-shaped metal container, and this metal container is filled with high-pressure SF ₆ gas as an insulating medium. According to such a gas insulated switchgear, it is possible to realize the miniaturization and sealing of the device, to improve the reliability and safety, to simplify the maintenance and inspection, and to construct a narrow site in a short time. . Therefore, recently, many gas insulated switchgears have been operated.

FIG. 8 shows a configuration of a conventional example of a typical gas insulated switchgear. In the figure, the gas insulated switchgear includes a bushing 1, a power receiving chamber 2, disconnectors 4, 5, 6, a lightning arrester 7, and a circuit breaker 8. High voltage drawn in by the bushing 1 is a conductor of the power receiving chamber 2. 3a, 3b, 3c
Are connected to disconnectors 4, 5, 6, a lightning arrester 7, and a circuit breaker 8. These devices are housed in an electrically grounded metal container, inside thereof is SF ₆ gas is filled 4-5 atmospheres as insulating arc-extinguishing medium. Power receiving room 2
Insulating spacers 9a and 9b are provided between the power supply and the disconnectors 4 and 5, and are divided into gas. In addition, disconnector 5,
Insulating spacers 9c and 9d are also provided between the circuit breaker 6 and the circuit breaker 8 to separate the gas.

At both ends of the circuit breaker 8, current transformers 10a and 10b for measuring current are arranged. When an arc is generated between the contacts upon the current interruption breaker 8 blows SF ₆ gas compressed by the piston (not shown) to the arc, so as to cut off the current is extinguished arc. Such a circuit breaker 8 is called a puffer-type gas circuit breaker, and is currently the mainstream. In addition, disconnectors 4, 5, 6
Regarding the above, a self-extinguishing type or a puffer type such as the circuit breaker 8 is selected depending on the required performance.

[0005]

The switchgear as above [0008] are used a large amount of SF ₆ gas as an insulating arc-extinguishing medium. SF ₆ gas has about 100 times the arc extinguishing performance and about 3 times the insulating performance as compared with air. This SF ₆ gas is a colorless, odorless, tasteless, nonflammable and very stable gas under normal operating conditions, and is non-toxic. As described above, SF ₆ gas is excellent as an insulating and arc-extinguishing medium.
When arc discharge occurs in F ₆ gas, SOF ₂ , SO
It is known to generate decomposition products and decomposition gases such as ₂ , SO ₂ F ₂ , SOF ₄ , HF, and SiF ₄ . When the fault current of several tens of kA is cut off by the circuit breaker 8, such decomposition products and decomposition gases are generated in large quantities. Further, in the disconnectors 4, 5, and 6, bus switching and line switching in the substation are performed, so that the duty of breaking the loop current is required. This loop current has a current value close to the rated current, and at that time, the above-described decomposition products and decomposition gases are generated in the disconnectors 4, 5, and 6.

[0006] decomposition products and decomposition gas toxicity of these SF ₆ gas is strong, if the recovery of decomposed products and gases, require special processing and management. Therefore, an adsorbent for recovering decomposition products and decomposition gases is indispensable inside the circuit breaker 8 and the disconnectors 4, 5, and 6. This adsorbent not only causes an increase in the size of the apparatus, but also makes it difficult to treat and manage the adsorbent after the recovery of decomposition products and decomposition gases, which makes it difficult to handle.

At present, environmental protection is a problem on a global scale.
Global warming as one of the indicators of global warming
There is a coefficient GWP (Global Warming Potential),
Contribution to global warming when a certain amount is released₂To
It is expressed as a ratio. SF ₆Gas is chemically very cheap
It has a long life in the atmosphere of 3200 years
Because it is big, SF₆GWP of gas is 23900 times
Big. However, the magnitude of contribution to global warming is GW
It is given by the product of P and the concentration in the atmosphere.₆gas
Is extremely low in the atmosphere, so SF₆The influence of gas
CO₂Very small compared to.

[0008] However, a large GWP means a large potential influence on global warming.
As SF ₆ gas emissions increase and their concentrations in the atmosphere increase in the future, their impact may be significantly greater than CO ₂ . From this point of view,
In the United Nations Framework Conference of the Parties to the Convention on the 3rd Climate Change, which was held in Kyoto (COP3) to the moon, SF ₆ gas is also added as a reduction target gas, correspondence is required for the reduction and suppression of emissions. As described above, it is difficult to use SF ₆ gas for the switchgear from the environmental point of view.

[0009] The present invention has been proposed in order to solve the above problems, and an object, the non-use of SF ₆ gas, eliminates the discharge of generation and SF ₆ gas decomposition products and decomposition gases Another object of the present invention is to provide a switchgear that is more compact, lower in cost, and more suitable for environmental harmony.

[0010]

To achieve the above object, a switchgear provided with a circuit breaker and a disconnector includes:
It has the following technical features.

According to a first aspect of the present invention, there is provided an electrically grounded metal container, wherein the metal container is filled with silicon oil and the circuit breaker is housed therein, and the circuit breaker includes a plurality of circuit breakers. Vacuum valves are arranged to face each other, and each of the vacuum valves is provided with a pair of fixed-side electrodes and a movable-side electrode that can be contacted and separated, and an arc shield surrounding the pair of electrodes. A fixed-side energized shaft is fixed to the movable-side electrode, and a movable-side energized shaft is fixed to the movable-side electrode, and the movable-side energized shafts are connected to each other via a conductor. A side energizing shaft is connected to the disconnector.

In the switchgear according to the first aspect having the above-described configuration, it is possible to interrupt the fault current in the vacuum valve in the circuit breaker. At this time, S
Instead of filling with F ₆ gas, silicon oil is filled to ensure insulation performance. Therefore, there is no generation of decomposition gas or decomposition products of SF ₆ gas at the time of current interruption. As a result, an adsorbent for recovering decomposition products and decomposition gases is not required, and mechanical strength such as a gas circuit breaker is not required, so that the configuration is simplified, and the apparatus is made more compact and lower in cost. Can be. Also, there is no need to consider the handling of the adsorbent after the decomposition products and decomposition gases have been collected. Furthermore, since SF ₆ gas is not emitted, the environment is extremely excellent.
Since silicon oil is difficult to ignite and has a small amount of combustion gas, it is an oil but has a low risk of fire as compared with mineral oil and is safe.

According to a second aspect of the present invention, in the switchgear according to the first aspect, four vacuum valves are disposed opposite to each other in the circuit breaker, and a vacuum valve adjacent to the vacuum valves disposed at both ends is provided. The movable energizing shafts are connected via a conductor, and the fixed-side energizing shafts of adjacent central vacuum valves are connected via another conductor, so that four vacuum valves are electrically connected in series. The fixed energizing shafts of the vacuum valves arranged at both ends are connected to the disconnecting switch, respectively.

In the switching device according to the second aspect of the present invention, the same effect as that of the first aspect of the invention can be obtained in a circuit breaker comprising a four-point vacuum valve. The installation area can be reduced,
This can contribute to cost reduction of the switchgear.

The third aspect of the present invention provides the first or second aspect.
The switchgear according to the above, wherein the disconnector, the grounding device, and the lightning arrester are housed in the metal container.

[0016] In switchgear or more third aspect, not only the circuit breaker in a metal container filled with silicone oil, disconnectors, because it houses the ground device and arrester, nonuse of SF ₆ gas It is suitable for environmental harmony. In addition, since multiple electrical devices are housed in the same metal container, the amount of silicon oil can be reduced,
The installation space for the switchgear can be reduced.

According to a fourth aspect of the present invention, in the opening and closing device according to the first, second or third aspect, an insulating rod for opening and closing operation is connected to the movable-side energized shaft, and the insulating rod is connected to the insulating rod through a link. An operation rod is connected, and an operation mechanism is connected to the operation rod.

In the opening / closing device according to the fourth aspect, the driving force from the operating mechanism can be transmitted to the movable-side energized shaft via the operating rod, the link, and the insulating rod. Can be simultaneously opened and closed. Therefore, the opening / closing operation timing of each vacuum valve is not shifted, and the reliability of current interruption is improved. Further, the cost of the operation mechanism can be reduced.

The invention according to claim 5 is the invention according to claims 1, 2, 3
5. The switchgear according to claim 4, wherein the vacuum valve is supported and fixed by an insulator having a relative dielectric constant of 7 or more.

In the switchgear according to the fifth aspect, by setting the relative permittivity of the insulator supporting the vacuum valve to 7 or more, the capacitance of the vacuum valve is increased, and the capacitance from the metal container is reduced. Can be suppressed. Therefore, the shared voltage of a plurality of vacuum valves connected in series can be made uniform, and excellent insulation characteristics can be exhibited.

According to a sixth aspect of the present invention, there is provided the first and second aspects.
6. The switching device according to 3, 4, or 5, wherein the vacuum valve is supported and fixed by an insulator made of epoxy resin filled with alumina.

The invention according to claim 6 also relates to an insulator for supporting a vacuum valve, similarly to the invention according to claim 5, but here, it is easy to fill the epoxy resin with alumina so as to easily form the insulator. The relative permittivity of the insulator can be increased. This makes it possible to increase the capacitance of the vacuum valve, suppress imbalance in the shared voltage of the vacuum valves connected in series, and improve the insulation characteristics.

[0023] The invention according to claim 7 is the first or second invention.
7. The switchgear according to 3, 4, 5, or 6, wherein the vacuum valve is housed in a cylindrical insulating cylinder, and has the same electric potential as the fixed-side energizing shaft and the movable-side energizing shaft in the insulating cylinder. And an arc shield side buried electrode having the same potential as that of the arc shield is disposed so as to face each other.

In the switching device according to the seventh aspect of the present invention, by providing the energized shaft side embedded electrode and the arc shield side embedded electrode, the capacitance of the vacuum valve can be increased. Similarly to the inventions of the sixth and sixth aspects, the sharing of the plurality of vacuum valves connected in series becomes uniform, and a switchgear having excellent insulation characteristics can be provided.

[0025]

Embodiments of the present invention will be described below in detail with reference to the drawings. (1) First Embodiment FIG. 1 shows 275 kV or 500 k according to the first embodiment.
It is a longitudinal section showing an example of composition of a V class switchgear.

In FIG. 1, a switchgear according to a first embodiment includes a bushing 1, a power receiving room 30, a connection bus 40,
It is composed of disconnectors 50a, 50b, a lightning arrester 32, and a circuit breaker 60, and the high voltage drawn in by the bushing 1 is connected to the connection bus 40 via the conductors 31a, 31b of the power receiving chamber 30.
It is connected to disconnectors 50a, 50b, lightning arrester 32, and circuit breaker 60.

The circuit breaker 60 is housed in a metal container 61 electrically grounded. In the metal container 61, two vacuum valves 70a and 70b are arranged to face each other. 145k in the example of the switchgear of 275kV class
The V-class vacuum valves 70a and 70b are opposed to two 275-kV class vacuum valves 70a and 70b in the case of a 500 kV class switching device.

The vacuum valves 70 a and 70 b are accommodated in an insulating tube 88 and supported and fixed, and are connected in series via a conductor 80. The metal container 61 is filled with silicone oil 62. In addition, the power receiving room 30,
The connection bus 40, the disconnectors 50 a and 50 b, and the lightning arrester 32 are also filled with silicone oil 62. Note that 9
6a and 96b are conservators for adjusting the oil amount of the silicon oil 62.

FIG. 2 shows a structural example of the vacuum valves 70a and 70b.
Shown in Each of the vacuum valves 70a and 70b is provided with an insulating cylinder 71 made of ceramic or glass. A fixed-side end plate 72a is provided at the upper opening of the insulating cylinder 71.
The movable side end plate 72b is brazed to the lower opening. A fixed-side energizing shaft 74a penetrates the fixed-side end plate 72a, and a movable-side energizing shaft 74b that can move up and down is penetrated through the movable-side end plate 72b. Movable energized shaft 7
A bellows 76 is attached to the opening of the movable side end plate 72b, and the insulating cylinder 71 is hermetically sealed. At this time, the internal pressure of the insulating cylinder 71 is 10 ⁻² P
a.

A fixed-side electrode 73a is joined to a lower end of the fixed-side energized shaft 74a, and a movable-side electrode 73b is joined to an upper end of the movable-side energized shaft 74b so as to face the fixed-side electrode 73a. Fixed side electrode 73a and movable side electrode 73b
Are provided with disk-shaped contacts 75a, 75b. The movable-side energizing shaft 74b is connected to an operating mechanism (not shown), and receives a driving force from the operating mechanism, and
b moves up and down, and the fixed side electrode 73a and the movable side electrode 73b
Are configured such that the contact points 75a and 75b of the contact point are separated from each other. Note that the disconnecting switch 50 is provided on the fixed-side energized shaft 74a side.
a, 50b are connected, and the conductor 80 is connected to the movable-side conducting shaft 74b side.

Further, an arc shield 7 is provided on the inner surface of the insulating cylinder 71 so as to surround the fixed side electrode 73a and the movable side electrode 73b. This arc shield 7
Is caused by the adhesion of metal vapor or metal powder scattered from the contacts 75a, 75b and the electrodes 73a, 73b.
This is for preventing the phenomenon that the insulation performance of the inner surface is reduced.

In the first embodiment having the above configuration, when a command to open the circuit breaker 60 is issued from the control circuit of the switchgear due to an accident or the like, the movable energizing shaft 74b connected to the operating mechanism (not shown) is activated. When driven, the fixed side electrode 73a and the movable side electrode 73b are opened. An arc is generated between the contacts 75a and 75b due to the fault current, but the plasma of the metal vapor forming the arc is diffused in a vacuum and extinguished at the next current zero point. At this time, in the first embodiment, even if the fault current is cut off, the SF ₆ gas is not filled in the metal container 61, so that no decomposition gas or decomposition products of the SF ₆ gas are generated.

Therefore, an adsorbent for recovering decomposition products and decomposition gas is not required, and the apparatus can be made compact. In addition, there is no worry about handling the adsorbent after recovering the decomposition products and the decomposition gas. Moreover, SF ₆
Since gas is not charged, a high mechanical strength such as a gas circuit breaker is not required, and an inexpensive metal container 61 can be employed, which is advantageous in terms of cost. Furthermore, since no SF ₆ gas is emitted, the environment is extremely excellent.

Various characteristics of the silicone oil 62 that insulates the outside of the vacuum valve 70 will be described based on the following Table 1 in comparison with other insulating oils. Silicone oil 6
2 insulation performance, as can be seen from Table 1, a substantially the same as the mineral oil used in transformers and the like, of about 4 atmospheres SF ₆
It is almost the same as gas. Therefore, the size of the circuit breaker 60 can be made substantially the same as the conventional gas circuit breaker without using SF ₆ gas.

[Table 1]

The flash point of silicone oil 62 is much higher than that of mineral oil used in transformers and the like, and it is difficult to ignite. Further, the combustion state of the silicon oil 62 is different from that of the mineral oil, and the amount of generated combustion gas is small and the combustion heat is small. Therefore, the flame is small and the risk of spreading fire to the surroundings is greatly reduced. Moreover, as expected from the high oxygen index, if the supply of oxygen from the surroundings is not sufficient, the spread of fire does not continue. Therefore, although it is oil,
Fire risk is extremely low and safe compared to mineral oil.

(2) Second Embodiment FIG. 3 shows a 275 kV or 500 k according to a second embodiment.
It is a longitudinal section showing an example of composition of a V class switchgear. The same parts as those in FIG. 1 are denoted by the same reference numerals, and description thereof will be omitted. Only different parts will be described here.

The feature of the second embodiment is that the circuit breaker 60 is constituted by a four-point vacuum valve. That is, the vacuum valves 70a, 70b, 70
c, 70d are arranged facing each other. Fixed-side energized shafts 74a of the vacuum valves 70a, 70d at both ends
Are connected to disconnectors 50a and 50b. In addition, the vacuum valve 7 adjacent to the vacuum valve 70a disposed at both ends.
The movable energizing shafts 74b of Ob are connected via a conductor 81, and the fixed energizing shafts 74a of the vacuum valves 70b and 70c are connected via another conductor. Further, the movable-side energizing shafts 74b of the vacuum valves 70c and 70d are connected to each other via a conductor 83, whereby the four vacuum valves 70a, 70b, 70c and 7 are connected.
0d is connected in series.

Also, in the second embodiment, the movable side conducting shaft 74b of the vacuum valves 70a, 70b, 70c, 70d
Is connected to an insulating rod 84 for opening and closing operation. An operating rod 86 is connected to the insulating rod 84 via a link 87 in a direction orthogonal to the insulating rod 84. Further, an operation mechanism 85 is connected to the operation rod 86.

The operation and effect of the second embodiment having the above configuration are as follows. That is, the circuit breaker 60
Even if a four-point vacuum valve is used, the vacuum valve 70
According to the connection configuration of a, 70b, 70c, and 70d, the same operation and effect as those of the first embodiment can be obtained, which is excellent not only in cost and environment but also in the installation area of the circuit breaker 60. The size can be reduced.

Further, in the second embodiment, the driving force from the operating mechanism 85 is applied to the operating rod 86 and the link 87.
In addition, it can be transmitted to the movable-side conducting shaft 74b via the insulating rod 84. At this time, the vacuum valves 70a, 70
The movement directions of the insulating rods 84 during the opening / closing operations of the b, 70c, and 70d are the same, and all the insulating rods 84 are connected to the operating rods 86 via the links 87. Vacuum valve 70
a, 70b, 70c, 70d can be simultaneously opened and closed. As a result, it is possible to contribute to the cost reduction of the operation mechanism 85, and at the same time, each vacuum valve 70a, 7
There is no fear that the timing of the opening / closing operation of Ob, 70c, 70d is shifted, and the current interruption can be reliably performed.

(3) Third Embodiment In a third embodiment, as shown in FIG. 4, an electrically grounded metal container 63 is filled with silicon oil 62. Inside the metal container 63, in addition to the circuit breaker 60, the lightning arrester 32, the disconnectors 50a and 50b, the vacuum valve 7
0a and 70b are collectively stored.

In the third embodiment as described above, the lightning arrester 32 and the disconnectors 50a, 50
b. Since the vacuum valves 70a and 70b are housed, the installation space for the opening and closing device can be significantly reduced. In addition, it is possible to reduce the filling amount of the silicone oil 62. Although two vacuum valves 70a and 70b are housed in the metal container 63 in FIG. 5, a structure in which four vacuum valves 70a, 70b, 70c and 70d are housed in the metal container 63 as shown in FIG. It may be.

(4) Fourth Embodiment The fourth embodiment is characterized in that the insulating cylinder 88 for supporting and fixing the vacuum valves 70a and 70b is made of a material having a relative dielectric constant of 7 or more. is there.

Vacuum valve 70 housed in metal container 61
The shared voltage of a and 70b is affected by the capacitance between the conductor 80 and the metal container 63. Further, since the relative dielectric constant of the silicone oil 62 is 2.5 as shown in Table 1 described above, the capacitance between the conductor 80 and the metal container 61 increases, and the use of the silicone oil 62 This promotes imbalance of the shared voltage in the vacuum valves 70a and 70b.

FIG. 6 is a graph showing the relationship between the relative dielectric constant of the insulating tube 88 and the shared voltage of the vacuum valve 70a. This is because the voltage V is applied to the fixed-side conducting shaft 74a of the vacuum valve 70a.
(100%) is applied, and the fixed-side conducting shaft 74a of the vacuum valve 70b is grounded. From this analysis result, it is understood that when the relative dielectric constant of the insulating cylinder 88 is set to 7 or more, the saturation occurs at about 50%, and the shared voltage becomes nearly uniform.

In the fourth embodiment, by setting the relative permittivity of the insulating cylinder 88 to 7 or more, the vacuum valves 70a, 7
0b can be increased, and the capacitance between the conductor 60 and the metal container 61 is less likely to be affected by the capacitance. Therefore, even when the silicone oil 62 is used as the insulating medium, there is no imbalance in the shared voltages of the vacuum valves 70a and 70b, and excellent insulating characteristics can be secured.

(5) Fifth Embodiment The fifth embodiment is characterized in that the material of the insulating cylinder 88 for supporting and fixing the vacuum valves 70a and 70b is made of epoxy resin filled with alumina. .

The relative permittivity of the epoxy resin itself is about 3 to 4, but the relative permittivity is increased by filling the epoxy resin with alumina. When the relative dielectric constant of the insulating cylinder 88 supporting the vacuum valves 70a and 70b increases, the capacitance of the vacuum valves 70a and 70b increases and the conductor 8
The influence of the capacitance between the zero and the metal container 63 is less likely to be affected, and the imbalance of the shared voltages of the vacuum valves 70a and 70b is reduced. Therefore, even if the silicon oil 62 is used, the imbalance of the shared voltage in the vacuum valves 70a and 70b can be suppressed, and the circuit breaker 60 having good insulation characteristics can be provided.

(6) Sixth Embodiment FIG. 7 is a longitudinal sectional view showing a configuration example of a vacuum valve and an insulating cylinder according to a sixth embodiment.

The insulating cylinder 8 for supporting and fixing the vacuum valve 70a
8, a fixed-side energizing shaft 74a and a movable-side energizing shaft 74
b-side buried electrodes 91 and 92 having the same electric potential as b.
And an arc shield side buried electrode 93 having the same potential as the arc shield 77 are arranged to face each other. The arc shield side embedded electrode 93 is connected to the arc shield 77 via a metal member 94.

Since the potential of the arc shield 77 is determined by the capacitance between the buried electrode 93 and the buried electrode 91 and the capacitance between the buried electrode 93 and the buried electrode 92, the buried electrodes 91, 92 and 93 are opposed to each other. By setting the same distance, the electric potential of the arc shield 77 can be set at an intermediate level. That is, in the sixth embodiment, by providing the embedded electrodes 91, 92, and 93, the capacitance of the vacuum valves 70a and 70b can be increased, and the electrostatic capacitance between the conductor 80 and the metal container 61 can be increased. The effect of the capacity can be reduced. As a result, it is possible to reduce the imbalance between the shared voltages of the vacuum valves 70a and 70b, and to obtain excellent insulation characteristics even when the silicon oil 62 is used.

[0052]

As described above, according to the present invention,
Without using SF ₆ gas at all, generation of decomposition products and decomposition gas and discharge of SF ₆ gas are eliminated, and a switchgear suitable for environmental harmony while promoting compactness and low cost can be provided.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a first embodiment of the present invention.

FIG. 2 is a vertical sectional view of the vacuum valve according to the first embodiment.

FIG. 3 is a longitudinal sectional view of a second embodiment of the present invention.

FIG. 4 is a longitudinal sectional view of a third embodiment of the present invention.

FIG. 5 is a longitudinal sectional view of a modified example of the third embodiment.

FIG. 6 is a graph showing a relationship between a relative dielectric constant of an insulating cylinder and a shared voltage of a vacuum valve.

FIG. 7 is a longitudinal sectional view of a vacuum valve according to a sixth embodiment of the present invention.

FIG. 8 is a longitudinal sectional view of a conventional switchgear.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Bushing 2, 30 ... Power receiving room 3a, 3b, 3c, 31a, 31b, 80, 81, 8
2,83 ... conductors 4,5,6,50a, 50b ... disconnector 7,32 ... lightning arrester 8,60 ... breaker 40 ... connection bus 61,63 ... metal container 62 ... silicon oil 70a, 70b, 70c, 70d ... Vacuum valve 71: insulating cylinder 73a: fixed-side electrode 73b: movable-side electrode 74a: fixed-side conducting shaft 74b: movable-side conducting shaft 75a: fixed-side contact 75b: movable-side contact 76: bellows 77: arc shield 84: insulating rod 85 ... Operation mechanism 86 ... Link 87 ... Operation rod 88 ... Insulating cylinder 91,92 ... Electrified shaft side embedded electrode 93 ... Arc shield side embedded electrode 94 ... Metal member

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) H02B 13/02 H02B 13/02 A (72) Inventor Toshiaki Inohara 2-1 Ukishima-cho, Kawasaki-ku, Kawasaki-ku, Kawasaki-shi, Kanagawa In the Toshiba Hamakawasaki Plant (72) Inventor Satoru Yanagibu 2-1 Ukishima-cho, Kawasaki-ku, Kawasaki-shi, Kanagawa Prefecture Inside the Toshiba Hamakawasaki Plant (72) Inventor Junichi Sato 1, Toshiba-cho, Fuchu-shi, Tokyo Stock 5G017 AA12 HH04 5G026 EA04 HA01 HA04 QA01 QB01 RA06

Claims (7)

[Claims] 1. A switchgear provided with a circuit breaker and a disconnector, wherein a metal container electrically grounded is provided, and the metal container is filled with silicon oil and the circuit breaker is housed therein. A plurality of vacuum valves are disposed opposite to each other in the circuit breaker, and each of the vacuum valves is provided with a pair of fixed-side electrodes and movable-side electrodes that can be contacted and separated, and an arc shield surrounding the pair of electrodes. A fixed-side energized shaft is fixed to the fixed-side electrode, and a movable-side energized shaft is fixed to the movable-side electrode. The movable-side energized shafts are connected to each other via a conductor, so that the vacuum valve is electrically connected. Wherein the fixed-side energized shaft is connected to the disconnector. 2. The circuit breaker is provided with four vacuum valves facing each other, the movable energizing shafts of the vacuum valves arranged at both ends and adjacent vacuum valves are connected via a conductor, and By connecting the fixed-side energizing shafts of adjacent vacuum valves via another conductor, four vacuum valves are electrically connected in series, and the fixed energizing shafts of the vacuum valves arranged at both ends are connected to each other. The switchgear according to claim 1, wherein each of the switchgears is connected to the disconnector. 3. The switchgear according to claim 1, wherein the disconnector, the grounding device, and the lightning arrestor are housed in the metal container. 4. An opening / closing operation insulating rod is connected to the movable energizing shaft, an operation rod is connected to the insulating rod via a link, and an operation mechanism is connected to the operation rod. The switchgear according to claim 1, 2 or 3, wherein: 5. The vacuum valve according to claim 1, wherein the vacuum valve is supported and fixed by an insulator having a relative dielectric constant of 7 or more.
Or the switchgear according to 4. 6. The switchgear according to claim 1, wherein the vacuum valve is supported and fixed by an insulator made of epoxy resin filled with alumina. 7. The vacuum valve is housed in a cylindrical insulating cylinder, and in the insulating cylinder, an energized shaft-side buried electrode having the same electric potential as the fixed-side energized shaft and the movable-side energized shaft; An arc shield and an arc shield side buried electrode having the same potential are arranged to face each other.
The switchgear according to 3, 4, 5 or 6.