JP2001346306A - Switchgear - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a small-sized, inexpensive switchgear high in safety and excellent in versatility and maintainability. SOLUTION: A main circuit opening/closing portion 85 that connects a load- side conductor 87 with a main circuit conductor 99 and disconnects them from each other, and a main circuit ground switching portion 77 that connects the main circuit conductor 99 with a bus-side conductor 75 and a grounding conductor 79 and disconnects them from each other are placed in a vacuum vessel 74. The load-side conductor 87, the bus-side conductor 75, and the grounding conductor 79 are connected with the load side, the bus side, and the ground side, respectively, in the air and the main circuit opening/closing portion 85 and the main circuit ground switching portion 77 are driven by driving devices 96 and 84, respectively.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a switchgear having a main circuit opening / closing section and a main circuit ground switching section, and also including a bus, a power transmission cable and other measurement and protection devices.

[0002]

2. Description of the Related Art FIG. 19 and FIG.
FIG. 1 shows a schematic side sectional view and an electrical connection diagram of a conventional switchgear shown in No. 115.
Three buses 2 for supplying phase power are provided at appropriate intervals in the horizontal direction, and a conductive metal is formed in a substantially rectangular shape below each bus bar 2 to maintain a high degree of vacuum inside. Nine opening / closing units each having a vacuum vessel 3 are arranged in a line in the longitudinal direction of the bus 2. Each vacuum vessel 3 is grounded. A bushing 5 made of ceramics, in which a bus-side conductor 4 penetrates vertically, is provided in a portion of the vacuum vessel 3 facing the bus 2, and the bus-side conductor 4 and the bus 2 are connected. The bus 2 and the like are buried in the solid insulator 6.

[0003] The lower end of the bus-side conductor 4 is bent, and the bent portion is supported by the insulator 7, and the fixed electrode 14 a of the main circuit opening / closing section 14 is provided at the tip thereof.
The movable electrode 14b is provided so as to oppose a. A shield 9 supported by an insulator 7 surrounds each of the electrodes 14a and 14b.
Covered by The movable electrode 14b is the conductive rod 1
0, and the conductive rod 10 is insulated rod 11
Is connected to one end of the first operating rod 13a through the
The operating rod 13a is hermetically inserted into the vacuum vessel 3 via the bellows 12, and the other end is connected to a second operating rod 13b which is swung by the main circuit driving device 16.

A fixed electrode 15 is provided below the main circuit switch 14.
a fixed electrode 15a is attached to the tip of a grounding conductor 17 supported in the vacuum vessel 3 via an insulator 8.
The base end of the grounding conductor 17 passes through the bushing 19 and is grounded. The movable electrode 15b is attached to one end of the conductive rod 20, and the other end of the conductive rod 20 is connected to one end of the first operation rod 23a via the insulating rod 21,
The other end of the first operation rod 23a is connected to a second operation rod 23b which is swung by the ground drive device 24. The first operation rod 23a is hermetically inserted into the vacuum vessel 3 via the bellows 22. A flexible conductor 32 is provided between the conductive rods 10 and 20, and a lower end of the flexible conductor 32 is connected to an upper end of the load-side conductor 18 that passes through the bushing 25. A lower end of the load-side conductor 18 is connected to a power transmission cable. 26.

In the above configuration, when the second operating rod 13b is driven by the main circuit driving device 16, the conductive rod 10 is connected via the first operating rod 13a and the insulating rod 11.
Moves forward, and the movable electrode 14b moves forward from the disconnection position to the cutoff position. When the second operating rod 13b is further driven, the conductive rod 10 moves forward further, the movable electrode 14b comes into contact with the fixed electrode 14a, the main circuit opening / closing section 14 is closed, and the flexible electrode 32 and the load-side conductor 18 are used. Power is supplied to the power transmission cable 26. On the other hand, when the main circuit is in the circuit state, the second operating rod 23b is
When the conductive rod 20 is moved forward and backward via the first operating rod 23a and the insulating rod 21, the movable electrode 15
b and the fixed electrode 15a come into contact with and separate from each other, and the grounding switch 15 functions as a grounding switch.

FIGS. 21 and 22 show Japanese Patent Application Laid-Open No. 11-2851.
15 shows a schematic side sectional view and an electrical connection diagram of another switchgear shown in No. 15, and shows the main circuit switching unit 14 with a circuit breaker 27.
And the disconnector 28. Circuit breaker 27 is fixed electrode 2
7a and the movable electrode 27b, the fixed electrode 27a is attached to the tip of the bus bar side conductor 4, the movable electrode 27b is fixed to the tip of the conductive rod 29, and the conductive rod 29 is connected to the first operation via the insulating rod 30. It is connected to the rod 33a. The first operation rod 33a is hermetically inserted into the vacuum vessel 3 via the bellows 31, and is connected to the second operation rod 33b which is swung by the cut-off electrode driving device 34.

A disconnector 28 is provided below the circuit breaker 27. The disconnector 28 includes a fixed electrode 28a and a movable electrode 28.
The fixed electrode 28a is attached to the projecting upper end of the load-side conductor 18 supported by the insulators 35 and 36 in the vacuum vessel 3, and the grounding opening / closing portion 15 is fixed to the central projecting portion of the load-side conductor 18. A flexible conductor 32b is provided between the conductive rod 20 to which the electrode 15a is attached and the movable electrode 15b of the grounding switch 15 and the conductor 17 for grounding.
Is erected. The movable electrode 28b of the disconnector 28 is attached to a conductive rod 37, and the conductive rod 37 is connected to an operation rod 39 via an insulating rod 38. The operation rod 39 is inserted into the vacuum vessel 3 via a bellows 40. ing. Flexible conductor 32a between conductive rods 29 and 37
The operation rod 39 is driven by a disconnection electrode driving device 41. As described above, in the switchgear shown in FIGS. 21 and 22, the main circuit opening / closing unit 14 is divided into two parts, the circuit breaker 27 and the disconnector 28.

FIGS. 23 and 24 show Japanese Patent Application Laid-Open No. 11-2851.
15 shows a schematic side sectional view and an electrical connection diagram of still another switchgear shown in No. 15, in which a vacuum vessel 42 accommodates a circuit breaker 27 and a vacuum vessel 43 accommodates a disconnector 28. A bushing 5 through which the bus conductor 4 penetrates is provided in the vacuum container 42, and a circuit breaker 27 and a shield 9 are housed in the vacuum container 42, and the movable electrode 27 b of the circuit breaker 27 is provided.
Is driven forward and backward by the cut-off electrode driving device 34, so that the fixed electrode 27a and the movable electrode 27b are separated from each other.

The vacuum vessel 43 provided below the vacuum vessel 42 is formed larger than the vacuum vessel 42,
The bushing 25 through which the load-side conductor 18 penetrates
, A bushing 19 through which the grounding conductor 17 penetrates is provided, and a disconnector 28 and a grounding switch 15 are provided in the vacuum vessel 43. Connection bushings 44a, 44b are attached to opposing portions of the vacuum vessels 42, 43, and the periphery thereof is insulated by a connection mold 45, and the connection bushings 44a, 44b are provided.
Connection conductors 46a and 46b penetrate through a and 44b and are connected to each other. Between the conductive rod 29 of the circuit breaker 27 and the connection conductor 46a, and the conductive rod 37 of the disconnector 28
The flexible conductor 32c is provided between the
32d is installed, and thereby the conductive rods 29, 3
7 is electrically connected. A flexible conductor 3 is provided between the grounding conductor 17 and the conductive rod 20 of the grounding switch 15.
2e is installed. Thus, the circuit breaker 27 is insulated by the vacuum container 42, and the disconnector 2 is
8 and the grounding switch 15 are insulated.

FIGS. 25 and 26 show a side sectional view and a circuit diagram of a switchgear disclosed in Japanese Unexamined Patent Application Publication No. 11-113118 under no load as another prior art. Reference numeral 47 denotes a switchboard. Is provided with a cutoff compartment 49 in which a vacuum grounding container 48 is housed, and a power supply side compartment 50 and a conductor compartment 51 above and below it. The vacuum bus 52 arranged in the power supply side compartment 50 is connected to the three-phase vacuum switch gears 53 to 55 in the vacuum earthing container 48 of the cutoff compartment 49, and the vacuum switch gears 53 to 55 are connected to the load in the conductor compartment 51. It is connected to the side conductor 56 and the cable head 57.

The vacuum switch gears 53 to 55 have a shut-off function,
It has a disconnecting function, a grounding function, and a function in which buses are integrally assembled.
9 and a movable electrode 60 that moves between them. The fixed electrode 58 is connected to the power supply side conductor 62 via the connection conductor 61, and the movable electrode 60 is connected to the flexible conductor 63.
Is connected to the load side conductor 56, and the load side conductor 56 is connected to the cable head 57 outside the vacuum grounding container 48. The movable electrode 60 is mechanically connected to the movable blade 64, and rotates by the rotation of the movable blade 64 driven by the operation mechanism 65.

When the movable electrode 60 pivots and moves to a closing position where it contacts the fixed electrode 58, power is supplied, and when the movable electrode 60 rotates below the closing position to reach the blocking position, the movable electrode 60 separates from the fixed electrode 58, Cut off the current. When the movable electrode 60 is further rotated downward to the disconnection position, an insulation distance is provided between the movable electrode 60 and the fixed electrode 58. When the movable electrode 60 is further rotated downward to the ground position, the movable electrode 60 is moved to the ground electrode 59. Contact with.

[0013]

In the above-mentioned conventional switchgear, the main circuit switch and the ground switch are housed in the same vacuum vessel. There is a possibility that a power outage of all circuits sharing the bus may be required, and since the bus is not grounded, there is a problem in operation. Also, if a problem occurs in either the main circuit opening / closing section or the grounding opening / closing section, it may spread to all inside the vacuum vessel, and if a problem occurs due to insulation deterioration etc. due to vacuum leakage etc. of the vacuum vessel, It is necessary to stop energization of all the vacuum vessels similarly connected by a common bus line to this vacuum vessel and to restore the circuits, so that all the circuits need to be powered down, which requires a great deal of restoration work.

Further, since the fixed device configuration is used, it is not possible to cope with many circuit configurations, and a large increase in product cost is required to cope with the circuit configuration. In addition, since the energizing routes running parallel to each other are housed in the same vacuum vessel, and the movable parts are connected by flexible conductors and the like, they may not be able to open and close normally due to the effects of electromagnetic force, etc. And the reliability is low. Further, the vacuum vessel requires high airtightness and is difficult to manufacture. However, the shape of the vacuum vessel needs to be further complicated, making the vacuum vessel difficult, and the safety and reliability for the performance of the vacuum vessel. And increased product costs.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems. It is an object of the present invention to make it possible to reduce the size, to reduce the cost of the product, and to prevent an internal arc short circuit. It is a highly safe switchgear that does not cause an explosion even when
An object of the present invention is to provide a switchgear having excellent versatility and maintainability, which can easily configure a circuit for specifications required by the market and can quickly and easily perform maintenance and response to a failure.

[0016]

According to a first aspect of the present invention, there is provided a switchgear comprising: a main circuit opening / closing portion for connecting / disconnecting a main conductor to / from a load side conductor or a bus side conductor; Or, a main circuit ground switching unit that switches between the load side conductor and the grounding conductor, and the inside is maintained in a vacuum, the main circuit switching unit and the main circuit ground switching unit are housed, and the mother ship side conductor and the grounding conductor A part of each of the load-side conductors and a vacuum vessel containing the main circuit conductor, a busbar-side conductor, a grounding conductor and a part of the load-side conductor protruding from the vacuum vessel and the motherboard side,
It has an air connection portion that connects the ground side and the load side in the air, and a drive portion that is provided outside the vacuum vessel and drives the main circuit switching portion and the main circuit ground switching portion, respectively.

According to a second aspect of the present invention, there is provided a switchgear comprising: a main circuit opening / closing section for connecting / disconnecting a load side conductor or a bus side conductor to / from a main circuit conductor; and a main circuit conductor comprising a bus side conductor or a load side conductor and a grounding conductor. The main circuit ground switching unit that switches to and from the main circuit, and the inside is kept in a vacuum and houses the main circuit ground switching unit,
A first vacuum container containing a bus-side conductor or a load-side conductor, a grounding conductor, and a part of each of the one main circuit conductors; A second vacuum vessel containing a conductor or a bus-side conductor and a part of each of the other main circuit conductors; and a bus-bar conductor, a grounding conductor, a load-side conductor and one main circuit conductor protruding from each vacuum vessel. Aerial connection part where the part and the bus side, ground side, load side and the other main circuit conductor are connected in the air respectively, and provided outside the vacuum vessel to drive the main circuit opening / closing part and main circuit ground switching part respectively It is provided with each drive part which performs.

The switchgear according to the third aspect is the first aspect.
Or in 2, the main circuit switching unit is connected to the fixed electrode connected to the load-side conductor or the busbar-side conductor via the main circuit conductor and the flexible conductor, and is driven by the driving unit to make contact with the fixed electrode. It has a movable electrode to be separated.

The switchgear according to the fourth aspect is the first aspect.
In any one of (a) to (c), the main circuit ground switching portion includes a fixed electrode connected to the bus-side conductor or the load-side conductor, a ground electrode connected to the grounding conductor, and a main circuit conductor and a flexible conductor. A movable electrode which is connected and driven by a drive unit to switch and contact with and separate from the fixed electrode and the ground electrode.

The switchgear according to the fifth aspect is the fourth aspect.
Wherein the main circuit ground switching section has a bus or load connection position at which the movable electrode contacts the fixed electrode, a ground position at which the movable electrode contacts the ground electrode, and an intermediate disconnection position therebetween.

The switchgear according to claim 6 is the switchgear according to claim 3.
In any one of the first to fifth aspects, the movable electrode is connected to the drive unit via an insulating rod.

The switchgear according to the seventh aspect is the first aspect.
In any one of the above-mentioned items 6, the vacuum vessel is made of a ground metal or an insulator having a ground layer on the outer surface,
Each conductor partly protruding outside the vacuum vessel is supported by the vacuum vessel via an insulating bushing.

The switchgear according to the eighth aspect is the first aspect.
In any one of the first to seventh aspects, the bus is arranged on the back side.

According to a ninth aspect of the present invention, there is provided the switchgear according to any one of the first to fourth aspects, wherein
A fixed electrode connected to the load-side conductor or the bus-side conductor,
A drive unit is provided with a movable electrode which is driven via a conductive rod to contact and separate from a fixed electrode, and which is electrically connected to a main circuit conductor via a sliding contact which slides on the conductive rod. is there.

According to a tenth aspect of the present invention, in the switch gear according to the first to third aspects, the main circuit ground switching portion is connected to a fixed electrode connected to the bus-side conductor or the load-side conductor and to a grounding conductor. The ground electrode, which is driven by the driving unit via the conductive rod, switches and separates from the fixed electrode and the ground electrode, and is electrically connected to the main circuit conductor via the sliding contact sliding with the conductive rod. It has a movable electrode connected thereto.

According to a eleventh aspect of the present invention, there is provided the switchgear according to any one of the first to tenth aspects, wherein a rubber connection member is provided at the air connection portion of each conductor which is supported by the vacuum vessel via an insulating bushing so as to partially project. In this case, interface insulation is performed by the connection insulating cylinder.

According to a twelfth aspect of the present invention, in the switchgear according to any of the second to eleventh aspects, the shapes of the first and second vacuum vessels on the air connection side are unified.

According to a thirteenth aspect of the present invention, there is provided the switchgear according to any one of the first to twelfth aspects, wherein a bushing structure is provided at an in-air connection portion of a conductor supported so as to partially protrude from the vacuum vessel via an insulating bushing. A lightning arrester is connected, and interface insulation is performed on the aerial connection part including the lightning arrester by a rubber connection insulating cylinder.

According to a fourteenth aspect of the present invention, in the switchgear according to any one of the first to thirteenth aspects, a bushing structure is provided at an aerial connection portion of a conductor supported so as to partially protrude from a vacuum vessel via an insulating bushing. An instrument transformer is connected, and interface insulation is applied to the aerial connection section including the instrument transformer by a rubber connection insulating cylinder.

According to a fifteenth aspect of the present invention, there is provided the switchgear according to any one of the first to fourteenth aspects, wherein a bushing structure is provided at an air connection portion of a conductor supported so as to partially protrude from the vacuum vessel via an insulating bushing. A voltage detector is connected, and the insulated connection section including the voltage detector is insulated by a rubber connection insulating cylinder.

According to a sixteenth aspect of the present invention, in the switch gear according to any one of the first to fifteenth aspects, a bus bushing having a bushing conductor connected to the bus side conductor and a bushing conductor connected to the load side conductor are penetrated. A current transformer for the instrument is built in one or both of the cable bushings.

[0032]

Embodiment 1 Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 to FIG. 3 are a schematic side sectional view, a schematic rear view, and an electrical connection diagram showing a main part configuration of a switchgear according to Embodiment 1 of the present invention. Outside the rectangular outer box 70, three buses 71 for supplying three-phase power are provided at appropriate intervals in the vertical direction, and on the entire surface of the bus 71, three bus bushes 72 and Three vacuum vessels 74 whose interiors are maintained at a high degree of vacuum are arranged side by side in the longitudinal direction of the bus bar 71 via the built-in bushing conductors 73 respectively. The vacuum container 74 is formed of a ground metal or an insulator having a ground layer on the outer surface.

A portion of the vacuum container 74 facing the bus bar bushing 72 is formed by molding ceramics into a truncated cone shape.
A bushing 76 having a busbar-side conductor 75 built therein.
The busbar-side conductor 75 projects from the bushing 76. The bus-side conductor 75 and the three buses 71
Are connected at the air connection via a bushing conductor 73. The bus-bar-side conductor 75 is extended to an appropriate position in the vacuum container 74, and a fixed electrode 77a having a disk shape is provided at the tip. Reference numeral 77b denotes a donut-shaped installation electrode which is disposed to face the fixed electrode 77a. A disk-shaped movable electrode 77c is provided between the electrodes 77a and 77b.
7c constitutes a main circuit ground switching unit 77.

The ground electrode 77b is connected to a ground-side conductor 79 which penetrates a ceramic truncated conical bushing 78 and protrudes to the outside, and the ground-side conductor 79 is grounded.
The movable electrode 77c is attached to one end of the conductive rod 80. The conductive rod 80 penetrates so as not to contact the inside of the ground electrode 77b.
2 is connected. The operating rod 82 passes through the vacuum container 74 in a gas-tight manner via the bellows 83. Drive device 84
Drives the operating rod 82 so as to be in a first position having a small guiding angle and a second position having a larger guiding angle.
As a result, the operating rod 82, the insulating rod 81, and the conductive rod 80 advance and retreat in two stages, and when they advance most, the movable electrode 77c and the fixed electrode 77a come into contact with each other, and the main circuit is connected to the bus 71 side. The main circuit is disconnected when the stage is retracted, and the movable electrode 77c comes into contact with the ground electrode 77b when the stage is retracted two stages, so that the main circuit is connected to the ground side.

Below the main circuit ground switching section 77, there is provided a main circuit opening / closing section 85 in which a fixed electrode 85a and a movable electrode 85b are arranged to face each other. The fixed electrode 85a is attached to one end of the load-side conductor 87, and the load-side conductor 87 penetrates a bushing 86 provided in the vacuum vessel 74 and protrudes to the outside. The bushing 86 is formed by molding ceramics into a truncated cone shape. You. The projecting load-side conductor 87 is connected to one end of the bushing conductor 88 at an air connection portion, the bushing conductor 88 is built in the cable bushing 89, the other end is connected to the load conductor 91, and the load conductor 91 is connected to the cable bushing 8.
9 is connected to a power transmission cable 90 fitted externally. On the other hand, the movable electrode 85b is attached to one end of a conductive rod 92, and the other end of the conductive rod 92 is connected to one end of an operation rod 94 via an insulating rod 93.
Are passed through the vacuum container 74 while being kept airtight by a bellows 95. The other end of the operation rod 94 is connected to a driving device 96.

The driving device 96 induces the operating rod 94 at a constant speed, thereby moving the operating rod 94, the insulating rod 93 and the conductive rod 92 forward and backward. When connected, the main circuit is closed and the main circuit is shut off when the main circuit retreats. Each of the electrodes 85a and 85b is covered with a cylindrical shield 97, thereby preventing an arc generated between the electrodes 85a and 85b from touching the vacuum vessel 74 and grounding. A conductive rod 80 supporting the movable electrode 77c of the main circuit ground switching unit 77 and a conductive rod 92 supporting the movable electrode 85b are provided.
Are a main circuit conductor 99 supported by a main circuit conductor support 98 in a vacuum vessel 74 and flexible conductors 100a, 100a, respectively.
0b. Reference numeral 101 denotes a busbar connection insulating cylinder.

In the switchgear having the above structure, when the movable electrode 77c of the main circuit ground switching section 77 is in contact with the fixed electrode 77a and is connected to the bus 71, the drive rod 96 induces the operation rod 94. Then, when the insulating rod 93 and the conductive rod 92 are advanced, the movable electrode 85b comes into contact with the fixed electrode 85a from the blocking position, and the main circuit opening / closing section 8
5 is closed, and power is supplied to the power transmission cable 90 via the load-side conductor 87 and the load conductor 91.

On the other hand, the operating rod 9 is driven by the driving device 96.
4 is induced, and the insulating rod 93 and the conductive rod 92 retreat, the movable electrode 85b retreats from the closed position to the cutoff position, and the supply of power to the power transmission cable 90 is cut off. As described above, since the operation rod 94 is moved forward and backward by one operation, the mechanical vibration applied to the bellows 95 for keeping the airtight between the operation rod 94 and the vacuum vessel 74 is reduced, and the driving force of the driving device 96 is reduced. Durability and reliability can be improved and the size can be reduced.

On the other hand, when the main circuit opening / closing section 85 is in the cutoff state, the operating rod 82 is attracted by the driving device 84,
When the insulating rod 81 and the conductive rod 80 retreat one step from the most advanced position, the main circuit is disconnected. When the insulating rod 81 and the conductive rod 80 retreat two steps, the movable electrode 77c contacts the ground electrode 77b,
The main circuit is grounded. In this state, when a voltage is applied to the power transmission cable 90 from outside the vacuum container 74 via the bushing 78, the degree of vacuum of the vacuum container 74 can be checked. In addition, when the main circuit switch 85 is closed in this state, the load side can be grounded. By applying a voltage to the power transmission cable 90 from outside the vacuum vessel 74 via the bushing 78, the power transmission cable 90 A pressure test can also be performed.

In the first embodiment, each of the electrodes 77a to 77c, 85a, 85
Since b is housed, the required insulation distance between the ground and the contact can be reduced, and the configuration can be reduced.
Further, when an arc short-circuit occurs in the electrode portion in the vacuum vessel 74, there is no gas to expand in the vacuum vessel 74, so there is no possibility of explosion. Further, since the vacuum vessel 74 is configured for each single phase, an interphase short circuit due to an arc between contacts at the time of interruption is prevented. In addition, by adopting a combination of the electrode portions according to the driving method, the driving devices 84 and 96 can be simplified, and the load on the components of the driving mechanism can be reduced, and the reliability and safety can be improved. it can. The conductors 75, 79, and 87 are connected to the bus side, the ground side, and the load side in the air, and only important parts for insulation are housed in the vacuum vessel 74. And a highly reliable switchgear can be constructed at low cost.
The efficiency of connection work, the ease of maintenance, and the speed of on-site restoration work such as replacement at the time of trouble can be improved. further,
Since the bus bar 71 is located on the back side, it is easy to pull out or insert the single-sided panel independently, leaving the bus bar 71 in the row state even after construction on site, and it is even quicker for expansion work and recovery work in case of accident Work can be performed.

The movable electrode 85b of the main circuit opening / closing section 85 is connected to the main circuit conductor 99 via the conductive rod 92 and the flexible conductor 100b, and is welded between the movable electrode 85b and the main circuit conductor 99. Does not occur, and the device configuration can be simplified. Further, the main circuit ground switching section 77 is connected to the fixed electrode 77.
a, the ground electrode 77b and the movable electrode 77c, and two circuits can be switched. Therefore, the device configuration can be simplified, and the movable electrode 77c is connected to the main circuit conductor 99 via the flexible conductor 100a and the like. The movable electrode 77c and the main circuit conductor 99
Does not occur, and the device configuration can be simplified.
Further, the main circuit ground switching unit 77 has a disconnection position between the bus connection position and the ground position, thereby improving the safety of circuit switching and continuously switching the standby state, the operation state, and the ground state. Simplification and downsizing during maintenance.

The movable electrodes 77c and 85b are connected to the driving devices 84 and 96 via the insulating rods 81 and 93, and the driving devices 84 and 96 do not serve as a charging unit. Becomes easier. Further, each of the conductors 75, 79, 87 is connected to an insulating bushing 76, 7 respectively.
Since the vacuum vessel 74 is supported by the vacuum vessel 74 via the holes 8, 86, the vacuum vessel 74 can be grounded, and can be safely and downsized.
Further, since the surface of the vacuum container 74 is grounded, it is safe and can be reduced in size.

Embodiment 2 FIG. 4 is a schematic side sectional view showing a main part of a switchgear according to Embodiment 2, wherein a conductive rod 80 for supporting a movable electrode 77c of a main circuit ground switching section 77, and a main circuit. The conductive rod 92 supporting the movable electrode 85b of the opening / closing section 85 includes:
Sliding contacts 102a and 102b fixed to the main circuit conductor 99 supported by the main circuit conductor support 98 are slidably penetrated. Other configurations are the same as those of the first embodiment.

In the second embodiment, each conductive rod 8
Reference numerals 0 and 92 slidably penetrate through the sliding contacts 102a and 102b, thereby making an electrical connection. When the movable electrodes 77c and 85b are moved, the conductive rods 80 and 92 are respectively connected to the sliding contacts 102a and 102b. 102a,
Guided to 102b, the reliability is improved and the safety against the influence of the electromagnetic force is improved.

Third Embodiment FIGS. 5 to 7 are a schematic side sectional view, a schematic rear view, and an electrical connection diagram showing a main part of a switchgear according to a third embodiment. The vacuum container 2 is maintained at a high vacuum similarly to the vacuum container 74, and is formed of a ground metal or an insulator having a ground layer on the outer surface. A driving device 84 is provided in the first vacuum vessel 103.
The first vacuum vessel 103 is provided with a bushing 76 containing a bus-side conductor 75 and a bushing 78 containing a grounding conductor 79 in the first vacuum vessel 103. 75 is the first vacuum vessel 1
03 and is connected to the bushing conductor 73 in the air. The second vacuum vessel 10 below the first vacuum vessel 103
4 is provided with a bushing 86 having a load-side conductor 87 built therein. The load-side conductor 87 protrudes from the second vacuum vessel 104 and is connected to the bushing conductor 88 in the air.

A main circuit opening / closing section 85 is provided in the second vacuum vessel 104. Each vacuum vessel 103, 104
Are provided with bushings 105 and 106 at opposing portions of the main circuit conductor 9, respectively.
9a and 99b are connected in the air. Conductive rod 80,
A flexible conductor 1 is provided between the conductor 92 and the main circuit conductors 99a and 99b.
00a and 100b.

In the third embodiment, the first vacuum vessel 1
The main circuit grounding switching unit 77 is insulated and housed in 03, and the main circuit opening / closing unit 85 is insulated and housed in the second vacuum vessel 104 to prevent non-uniform electrode consumption due to arc of one electrode. As a result, the insulator force is stably maintained and the safety is improved without affecting the contact failure and the like.
In addition, since the vacuum chambers 103 and 104 are provided independently for each electrode portion, the size can be reduced, and the structure is simplified to improve the productivity. The performance is also improved.

Fourth Embodiment FIG. 8 is a schematic side sectional view showing a main part of a switchgear according to a fourth embodiment, in which a bus-bar-side conductor 75 protruding from a bushing 76 and a bushing conductor 73 protruding from a busbar bushing 72. At the aerial connection portion, a rubber connection insulating cylinder 108 is brought into close contact with the surface of both bushings 76 and 72 to provide interfacial insulation, thereby protecting the insulation. The connection insulating tube 108 is formed in a T shape having two connection fitting portions and one connection working port, and the connection fitting portion has an inner diameter smaller than the outer diameter of both bushings 72 and 76. A certain pressing force is applied by the self-compression of rubber when fitted to both bushings 72 and 76, and insulation is performed at the interface. When not working, an insulating plug is inserted into the connection working port, so that insulation is also performed at the interface.

Similarly, at the aerial connection portions of the main circuit conductors 99a, 99b projecting from the bushings 105, 106, the rubber connection insulating cylinder 107 is connected to both bushings 105, 106.
The surface is brought into close contact with the surface of 106. Also, bushings 86, 8
9, the load-side conductor 87 and the bushing conductor 88
In the aerial connection portion, a rubber connection insulating cylinder 109 is brought into close contact with the surface of both bushings 86 and 89 to provide interface insulation. The connection insulating cylinders 107 to 109 are detachable.

In the fourth embodiment, the interface between the air connection portions is insulated by the detachable connection insulating cylinders 107 to 109 made of rubber, so that the size can be further reduced without impairing the easiness of connection and maintenance. In addition, a switchgear with low cost and high safety and maintainability can be obtained.

Fifth Embodiment FIGS. 9 and 10 are a schematic side sectional view and an electrical connection diagram showing a main part of a switchgear according to a fifth embodiment. A bus-side conductor 75 is provided in a second vacuum vessel 104. A built-in bushing 76 is provided, and the busbar-side conductor 75 is connected to the bushing conductor 73 in the air. A main circuit opening / closing portion 85 is provided in the second vacuum vessel 104, the fixed electrode 85 a is attached to the inner end of the bus-side conductor 75, and the movable electrode 85 b is driven by a driving device 96. Second vacuum vessel 104
A first vacuum vessel 103 is provided below the bushing. A bushing bushing 86 containing a load-side conductor 87 and a bushing 78 containing a ground-side conductor 79 are provided in the first vacuum vessel 103. The load-side conductor 87 is connected to the bushing conductor 88 in the air. First vacuum vessel 10
A main circuit ground switching unit 77 is provided in the unit 3, the fixed electrode 77 a is attached to the inner end of the load-side conductor 87, and the movable electrode 77 c is driven by a driving device 84. Bushings 105, 1 are provided at opposing portions of the vacuum vessels 103, 104.
The main circuit conductors 99a and 99b are connected in the air. Each conductive rod 80, 92 is connected to a main circuit conductor 99a, 9 via a flexible conductor 100a, 100b.
9b.

The bus-side conductor 75 and the bushing conductor 73
At the aerial connection part, the connection insulating cylinder 108 is brought into close contact with the surface of the bushings 76 and 72 to provide interface insulation. or,
Aerial connection part of main circuits 99a and 99b and load side conductor 87
Also in the air connection between the bushing and the bushing conductor 88, interface insulation is provided by the connection insulating cylinders 107 and 109.

In the fifth embodiment, the main circuit switch 85
Separates the bus-side conductor 75 from the main circuit conductor 99b, and the main circuit ground switching unit 77 connects the main circuit conductor 99a to the load-side conductor 87.
And the ground conductor 79. In addition, each vacuum vessel 1
Since the shapes of the aerial connection portions 03 and 104 are unified, there is no problem even if the first and second vacuum vessels 103 and 104 are replaced and mounted, and the circuit is changed according to the required functions. This makes it easy to obtain a highly versatile switchgear satisfying many specifications at low cost.

Embodiment 6 FIGS. 11 and 12 show a schematic side sectional view and an electrical connection diagram of a main part of a switchgear according to Embodiment 6, and show an air connection between a load-side conductor 87 and a bushing conductor 88. , A lightning arrester 113 is connected to a primary conductor 111 that is built in a bushing 110 and branched from an aerial connection portion. Further, a rubber connection insulating cylinder 114 is provided at the aerial connection portion of the conductors 87, 88, 111 with the bushings 86, 8 respectively.
9 and 110 are brought into close contact with each other to provide interface insulation. Also,
From the lightning arrester 113, a ground conductor 112 for diverting a current such as a lightning strike and a switching surge to the ground protrudes, and is grounded by a conductor connected to its base end. Connection insulation tube 1
Reference numeral 14 denotes a cross shape having three connection fitting portions and one connection working port, and a bushing 8 is provided on each connection fitting portion.
6, 89, and 110 are fitted to each other to provide interface insulation. An insulating plug is inserted into the connection port so that a similar interfacial insulation can be achieved.

In the sixth embodiment, the connection insulating cylinder 114 is connected to the air connection portion to which the lightning arrester 113 having the bushing structure is connected.
The interface is insulated, and the shape of each connection part that makes the interface insulation is unified, the connection of the lightning arrester 113 becomes easy, and the protection of the circuit against lightning impulse and switching surge becomes possible. The circuit can be easily configured with ease, and a reduced, safe and versatile switchgear can be obtained.

Seventh Embodiment FIGS. 13 and 14 are a schematic side sectional view and an electrical connection diagram showing a main part of a switchgear according to a seventh embodiment.
An instrument transformer 117 is connected to an aerial connection between the load-side conductor 87 and the bushing conductor 88 via a primary conductor 116 built in the bushing 115. Further, a rubber connection insulating cylinder 114 is connected to each of the bushings 86, 89, 1 with respect to the aerial connection portion to which the conductors 87, 88116 are connected.
No. 15 is closely adhered from the creepage surface, and insulation protection is performed by interfacial insulation. The bushings 86, 89, and 115 are fitted to respective fitting portions of the connection insulating cylinder 114 to provide interface insulation. The connection working port is also as described above, and the whole is insulated.

In the seventh embodiment, the insulated connecting portion to which the instrument transformer 117 having the bushing structure is connected is insulated by the connection insulating cylinder 114, and the shape of each connecting portion forming the interfacial insulation is unified. This makes it easy to connect the instrument transformer 117, enables protection and measurement of the voltage of the circuit, makes it easy to configure the circuit for the required functions, and is low-cost and satisfies many specifications. A highly reliable switchgear can be obtained.

Eighth Embodiment FIGS. 15 and 16 show a schematic side sectional view and an electrical connection diagram of a main part of a switchgear according to an eighth embodiment, wherein an air connection between a load-side conductor 87 and a bushing conductor 88 is shown. A voltage detector (VD) 120 is branched and connected via a primary conductor 119 built in the bushing 118. Also, conductor 87,
Rubber connection insulating tubes 114 are brought into close contact with the aerial connection portions 88 and 119 from the creeping surfaces of the bushings 86, 89 and 118 to provide interfacial insulation and provide insulation protection. The shape of the connection insulating cylinder 114 is as described above, and the bushings 86, 89, and 118 are fitted into the respective fitting portions to perform interface insulation. Also, an insulating plug is inserted into a connection working port of the connection insulating cylinder 114 to perform interface insulation.

In the eighth embodiment, the connection insulating cylinder 114 is connected to the air connection portion to which the voltage detector 120 having the bushing structure is connected.
The surface of each connection part that forms the interface insulation is unified, the connection of the detector 120 is easy, the voltage of the circuit can be detected, and the circuit can be easily configured for the required functions. And a highly versatile switchgear satisfying many specifications at low cost.

Ninth Embodiment FIGS. 17 and 18 are a schematic side sectional view and an electrical connection diagram showing a main part of a switchgear according to a ninth embodiment, respectively.
An instrument current transformer 121 is incorporated in the busbar bushing 72 penetrating the bushing conductor 73, and an instrument current transformer 122 is incorporated in the cable bushing 89 penetrating the bushing conductor 88. Bushing conductor 73,
88 penetrates the current transformers 121 and 122 for instruments.
Note that one of the instrument current transformers 121 and 122 may be used.

In the ninth embodiment, it is possible to measure and protect the current of the bus or the load while maintaining the shape of each connection part forming the interface insulation, and to easily configure a circuit for required functions. It is possible to obtain a highly versatile switchgear satisfying many specifications at a low cost.

[0062]

As described above, according to the first aspect of the present invention, since the main circuit opening / closing section and the main circuit ground switching section are housed in a vacuum vessel having excellent insulation properties, it is necessary to provide a connection between the ground and the contacts. Insulation distance can be reduced, and the size of the switchgear can be reduced. Further, when an arc short-circuit occurs in the electrode portion in the vacuum vessel, there is no gas to expand in the vacuum vessel, so there is no possibility of explosion. Furthermore, since the vacuum vessel is configured for each single phase, interphase short-circuit due to arc between contacts at the time of interruption is prevented. In addition, by adopting a combination configuration of the electrode units according to the driving method, the driving unit can be simplified, the load on the components of the driving mechanism can be reduced, and the reliability and safety can be improved. In addition, the connection part is in the air, and only the important parts for insulation are housed in the vacuum container. This simplifies the vacuum container, makes it possible to construct a low-cost and highly reliable switchgear, Efficiency, easiness of maintenance, and quickness of on-site restoration work such as replacement in the event of trouble can be achieved.

According to the second aspect of the present invention, the main circuit switching section and the main circuit ground switching section are housed in separate vacuum vessels, so that non-uniform consumption by one of the electrodes due to the arc is prevented, and a stable dielectric strength is maintained. And safety is improved without affecting the contact failure and the like. In addition, since they are stored separately, miniaturization is possible, and the simplification of the structure improves productivity, and the reliability and safety of each vacuum vessel to high vacuum are improved.

According to the third aspect, the movable electrode of the main circuit opening / closing portion is connected to the main circuit conductor via a flexible conductor, so that welding does not occur between the two and the device configuration can be simplified. .

According to the fourth aspect, the main circuit ground switching section is composed of a fixed electrode, a ground electrode, and a movable electrode, and two circuits can be switched. Therefore, the device configuration can be simplified and the movable electrode can be used. Since it is connected to the main circuit conductor via the conductor, welding between the two does not occur, and the device configuration can be simplified and reduced.

According to claim 5, the main circuit ground switching unit includes:
A disconnection position is provided between the bus or load connection position and the grounding position, improving the safety of circuit switching, and enabling continuous switching between the standby state, operating state, and grounding state, and maintenance. Time can be simplified and reduced.

According to the sixth aspect, the movable electrode is connected to the driving section via the insulating rod, and the driving section does not become a charging section. Therefore, the connection of the driving section is facilitated and the size can be reduced.

According to the seventh aspect, since each conductor is supported by the vacuum vessel via the insulating bushing, the vacuum vessel can be grounded, and can be reduced in size safely, and the surface of the vacuum vessel is grounded. Therefore, it is possible to safely reduce the size.

According to the eighth aspect, since the bus bar is arranged on the back side, it is easy to pull out or insert the single-sided board independently while leaving the bus bar in the row state even after construction on site, and to add In addition, quick work can be performed for recovery work in the event of an accident.

According to the ninth and tenth aspects, the movable electrode is electrically connected to the main circuit conductor through the sliding contact sliding on the conductive rod, and the movable shaft is supported by the sliding contact. The reliability is improved, and the safety against the influence of the electromagnetic force is improved.

According to the eleventh aspect, the interface insulation of the air connection portion is performed by the rubber connection insulating cylinder, and further reduction in size can be achieved without impairing the easiness of connection and maintenance. A switchgear with low cost and high safety and maintainability can be obtained.

According to the twelfth aspect, since the shape of the vacuum connection side of each vacuum vessel is unified, there is no problem even if the vacuum vessel is replaced and mounted, and the circuit is adapted to the required function. It is easy to change, and a highly versatile switchgear that satisfies many specifications at low cost can be obtained.

According to the thirteenth aspect, by facilitating the connection of the lightning arrester, it is possible to protect the circuit against lightning impulse and switching surge, and to obtain a downsized, safe and versatile switchgear.

According to the fourteenth aspect, the connection of the instrument transformer is facilitated, the protection against the voltage of the circuit and the measurement are enabled, and a downsized, safe and versatile switchgear can be obtained.

According to the fifteenth aspect, the connection of the voltage detector is facilitated, the voltage of the circuit can be detected, and the downsized, safe and versatile switchgear can be obtained.

According to the sixteenth aspect, the switchgear can be measured and protected against the current of the bus or the load while maintaining the shape of each connection part forming the interface insulation, and is downsized, safe and versatile. Is obtained.

[Brief description of the drawings]

FIG. 1 is a schematic side sectional view of a switchgear according to a first embodiment.

FIG. 2 is a schematic rear view of the switchgear according to the first embodiment.

FIG. 3 is an electrical connection diagram of a switchgear according to the first embodiment.

FIG. 4 is a schematic side sectional view of a switchgear according to a second embodiment.

FIG. 5 is a schematic side sectional view of a switchgear according to a third embodiment.

FIG. 6 is a schematic rear view of a switchgear according to a third embodiment.

FIG. 7 is an electrical connection diagram of a switchgear according to a third embodiment.

FIG. 8 is a schematic side sectional view of a switchgear according to a fourth embodiment.

FIG. 9 is a schematic side sectional view of a switchgear according to a fifth embodiment.

FIG. 10 is an electrical connection diagram of a switchgear according to a fifth embodiment.

FIG. 11 is a schematic side sectional view of a switchgear according to a sixth embodiment.

FIG. 12 is an electrical connection diagram of a switchgear according to a sixth embodiment.

FIG. 13 is a schematic side sectional view of a switchgear according to a seventh embodiment.

FIG. 14 is an electrical connection diagram of a switchgear according to a seventh embodiment.

FIG. 15 is a schematic side sectional view of a switchgear according to an eighth embodiment.

FIG. 16 is an electrical connection diagram of a switchgear according to an eighth embodiment.

FIG. 17 is a schematic side sectional view of a switchgear according to a ninth embodiment.

FIG. 18 is an electrical connection diagram of a switchgear according to a ninth embodiment.

FIG. 19 is a schematic side sectional view of a conventional switchgear.

FIG. 20 is an electrical connection diagram of a conventional switchgear.

FIG. 21 is a schematic side sectional view of another conventional switchgear.

FIG. 22 is an electrical connection diagram of another conventional switchgear.

FIG. 23 is a schematic side sectional view of still another switchgear.

FIG. 24 is an electrical connection diagram of still another switchgear.

FIG. 25 is a schematic side sectional view of another conventional switchgear.

FIG. 26 is an electrical connection diagram of another conventional switchgear.

[Explanation of symbols]

71 busbar 72 busbar bushing 73, 88 bushing conductor 74, 103, 104 vacuum vessel 75 busbar side conductor 76, 78, 86, 105, 106, 110, 115,
118 bushing 77 main circuit ground switching section 77a, 85a fixed electrode 77b ground electrode 77c, 85b movable electrode 79 ground conductor 80, 92 conductive rod 81, 93 insulating rod 84, 96 driving device 85 ... Main circuit opening / closing part 87 ... Load side conductor 89 ... Cable bushing 99,99a, 99b ... Main circuit conductor 100a, 100b ... Flexible conductor 102a, 102b ... Sliding contact 107-109,114 ... Connection insulating tube 113 ... Lightning arrester 117: Instrument transformer 120: Voltage detector 121, 122: Instrument current transformer

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Satoshi Sato 2-1-1-17 Osaki, Shinagawa-ku, Tokyo Inside the company Meidensha Co., Ltd. (72) Yukio Yamada 2-1-1-17 Osaki, Shinagawa-ku, Tokyo Stock Company F-term (reference) in Shameidensha 5G017 AA23 BB01 BB12 FF01 JJ01 5G026 RA01

Claims (16)

[Claims] A main circuit switch for connecting and disconnecting a load-side conductor or a bus-side conductor to and from a main circuit conductor, and a main circuit for switching a main-circuit conductor between a bus-side conductor or a load-side conductor and a grounding conductor. The ground switching unit, the inside of which is kept in vacuum, housed the main circuit switching unit and the main circuit ground switching unit, and housed a part of each of the motherboard-side conductor, the grounding conductor, and the load-side conductor and the main circuit conductor. A vacuum vessel, an air connection part where the busbar side conductor, the grounding conductor and the load side conductor protruding from the vacuum vessel and the mother ship side, the ground side and the load side are connected in the air, respectively, and provided outside the vacuum vessel. A switchgear comprising a drive unit for driving a main circuit switching unit and a main circuit ground switching unit. 2. A main circuit opening / closing portion for connecting / disconnecting a load side conductor or a bus side conductor to / from a main circuit conductor, and a main circuit for switching / separating the main circuit conductor between a bus side conductor / load side conductor and a grounding conductor. A ground switching unit and a first circuit in which the inside is kept in a vacuum, the main circuit ground switching unit is housed, and the bus-side conductor or the load-side conductor, the grounding conductor, and a part of each of the one main circuit conductor are housed. A vacuum container, a second vacuum container having an interior kept in vacuum, accommodating the main circuit opening / closing section, and accommodating a part of each of the load-side conductor or the bus-side conductor and the other main circuit conductor; Aerial connection where the conductor, grounding conductor, load-side conductor and one main circuit conductor protruding from each vacuum vessel and the bus, ground, load and other main circuit conductors are connected in the air, respectively. And provided outside the vacuum vessel,
A switchgear comprising a drive unit for driving a main circuit switching unit and a main circuit ground switching unit, respectively. 3. The main circuit switching section is connected to a fixed electrode connected to the load-side conductor or the busbar-side conductor, is connected to the main circuit conductor via a flexible conductor, and is driven by the driving section to form the fixed electrode. 3. The switchgear according to claim 1, further comprising a movable electrode that comes in contact with and separates from the switchgear. 4. The main circuit ground switching section is connected to a fixed electrode connected to a bus-side conductor or a load-side conductor, a ground electrode connected to a grounding conductor, and a main circuit conductor and a flexible conductor. The switchgear according to any one of claims 1 to 3, further comprising a movable electrode that is driven by the drive unit to switch to and away from the fixed electrode and the ground electrode. 5. The main circuit ground switching section has a bus or load connection position where the movable electrode is in contact with the fixed electrode, a ground position where the movable electrode is in contact with the ground electrode, and an intermediate disconnection position therebetween. The switchgear according to claim 4, wherein 6. The switchgear according to claim 3, wherein the movable electrode is connected to the drive unit via an insulating rod. 7. The vacuum container is formed of a ground metal or an insulator having a ground layer on the outer surface, and each conductor partially projecting outside the vacuum container is supported by the vacuum container via an insulating bushing. The switchgear according to any one of claims 1 to 6, wherein 8. The switchgear according to claim 1, wherein the bus is arranged on the back side. 9. The main circuit switching part includes a fixed electrode connected to the load-side conductor or the bus-side conductor, and a driving part driven by a driving part via a conductive rod to come in contact with and separate from the fixed electrode. The switchgear according to any one of claims 1, 2, 4 to 8, further comprising a movable electrode electrically connected to the conductive rod via a sliding contact that slides. 10. A main circuit ground switching unit, comprising: a fixed electrode connected to a bus-side conductor or a load-side conductor; a ground electrode connected to a grounding conductor; and a driving unit driven via a conductive rod. While switching to and from the fixed electrode and the ground electrode,
10. The switchgear according to claim 1, further comprising a movable electrode electrically connected to the main circuit conductor via a sliding contact that slides with the conductive rod. . 11. An insulated portion of an air connection portion of each conductor supported so as to partially protrude from a vacuum container via an insulating bushing is provided with an interface insulation by a rubber connection insulating cylinder. The switchgear according to any one of 1 to 10. 12. The switchgear according to claim 2, wherein the first and second vacuum vessels have a unified shape on the air connection side. 13. A lightning arrester having a bushing structure is connected to an aerial connection portion of a conductor supported so as to partly protrude through an insulating bushing in a vacuum container, and a rubber connection is made to the aerial connection portion including the arrestor. The switchgear according to any one of claims 1 to 12, wherein interface insulation is provided by the connection insulating cylinder of (1). 14. A transformer for an instrument having a bushing structure is connected to an in-air connection part of a conductor supported so as to partly protrude through an insulating bushing to a vacuum container, and an air transformer including the transformer for the instrument is connected. The switchgear according to any one of claims 1 to 13, wherein the middle connection portion is provided with interface insulation by a rubber connection insulating cylinder. 15. An electric connector having a bushing structure is connected to an aerial connection portion of a conductor supported so as to partly protrude through an insulating bushing in a vacuum vessel, and the aerial connection portion including this detector is connected to the aerial connection portion. The switchgear according to any one of claims 1 to 14, wherein interface insulation is provided by a rubber connection insulating cylinder. 16. A current transformer for an instrument is incorporated in one or both of a bus bushing penetrating a bushing conductor connected to a bus-side conductor and a cable bushing penetrating a bushing conductor connected to a load-side conductor. The switchgear according to any one of claims 1 to 15, wherein: