JP2014099381A - Gas-insulated switchgear - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a gas-insulated switchgear which can be made downsized by decreasing hight thereof.SOLUTION: An electric power receiving cable 5 lead from a cable 6 is electrically connected to an electric power receiving side disconnector 2a, an electric power receiving side grounding switch 2b, and an arrester 2c. A breaker 1a, in an electric power receiving side region, is connected to the electric power receiving cable 5 through the electric power receiving side disconnector 2a and is connected to a disconnector with grounding switch arranged on a downside through an insulation spacer 100c. The disconnector with grounding switch arranged on the downside includes a grounding electrode on a backside of a gas-insulated container 100a and a bus bar side electrode 3c closer to a grounding electrode 3b side rather than to an electrically connected part with the disconnector 1a. The bus bar side electrode 3c is connected to one bus bar 7a through a main circuit side electrode 4i of a disconnector with a grounding switch arranged on an upper side. The disconnector with the grounding switch arrange on the upper side includes a grounding electrode 4b in a front side of the gas-insulated container 100a. The other bus bar 7b is connected between the main circuit electrode 4i and the grounding electrode 4b of the disconnector with the grounding switch arranged on the upper side.

Description

  The present invention relates to a gas-insulated switchgear, and more specifically, a circuit breaker and a disconnector are installed in a gas-insulated sealed container, a power receiving unit that receives power from the power system, and a circuit breaker and a disconnector are installed in the gas-insulated container. The present invention relates to a gas insulated switchgear having a power supply unit that supplies power to a load side via a bus.

  As background art of the present invention, Patent Document 1 discloses a cubicle type gas insulated switchgear (C-GIS).

Main circuit devices such as power disconnecting switch, circuit breaker, and bus disconnecting switch are housed in a sealed container filled with insulating gas such as SF ₆ or dry air, and a power cable is connected to the outer frame on the back side of the sealed container. The bus bar is accommodated, and the operation mechanism of the main circuit device is installed on the front side of the sealed container, and the devices are connected by the main circuit conductor.

  In addition, the sealed container is divided into a compartment that houses the circuit breaker by a partition wall and a compartment that contains the busbar disconnector, so that the impact when an accident such as a short circuit occurs in each compartment is kept to a minimum. Yes.

  In this power-receiving gas-insulated switchgear, power is drawn from the power system by a power cable, and power is supplied to the bus via the power-receiving disconnector-breaker-busbar disconnector.

  In the case of a gas insulated switchgear for power supply, power is received from the bus and is supplied to the power cable connected to the load via the busbar disconnector-breaker-feeder disconnector. In the gas insulated switchgear configured as described above, there is an advantage that the main circuit device and the main circuit conductor can be downsized by installing them in a sealed container filled with an insulating gas.

JP 2004-64955 A

  However, even in the above-described gas insulated switchgear, when the power receiving system with two-line pull-in-1 VCT-2 line feed and bypass disconnector is configured with a cubicle type gas insulated switchgear, the double bus is switched as shown in FIG. Therefore, it is necessary to use two combinations of the disconnect switch (DS) 301 and the ground switch (ES) 302. In this case, in order to arrange the operation mechanism of the devices on the front surface of the device, it is necessary to arrange these devices up and down and to install a conductor while maintaining a distance to ensure insulation, which increases the height of the device. There are challenges.

  The present invention has been made in consideration of the above-described problems, and is capable of switching between double busbars, grounding each busbar, and reducing the height of the apparatus and reducing the size of the gas-insulated switchgear. An object is to provide an apparatus.

  The gas-insulated switchgear according to the present invention is configured by accommodating a main circuit device having at least a disconnect switch, a ground switch, a circuit breaker, and a disconnect switch with a ground switch in a gas insulating container filled with an insulating gas. The inside of the gas insulation container is divided into two regions on the bus bar side and the power reception side by a partition plate, and a cable head for drawing a power reception cable into the region on the power reception side is disposed on the back side of the gas insulation container. The power receiving cable is electrically connected to a power receiving side disconnector, a power receiving side ground switch, and an arrester in the power receiving side region. The circuit breaker is electrically connected to the power receiving cable through the power receiving side disconnector in the power receiving side region. The circuit breaker is electrically connected to a disconnector with a grounding switch disposed on the busbar side through an insulating spacer that is provided on the partition plate and secretly connects the divided area. Is done. The disconnector with grounding switch arranged at the lower side has a grounding electrode on the back side of the gas insulating container, and has a bus-side electrode on the grounding electrode side of the electrical connection with the circuit breaker. The bus bar side electrode is electrically connected to one bus bar via the main circuit side electrode of the disconnector with grounding switch arranged on the upper side. The upper-disposed disconnect switch with ground switch has a ground electrode on the front side of the gas insulating container. The other bus is connected between the main circuit electrode and the grounding electrode of the disconnector with grounding switch arranged on the upper side.

  According to the apparatus of the present invention, it is possible to perform bus switching and bus grounding with the shortest conductor length without separately providing a grounding switch and a disconnecting switch in the bus switching unit in the gas insulated switchgear. Thereby, a gas insulated switchgear can be reduced in size and an installation volume can be reduced.

It is an internal block diagram which shows Example 1 of this invention. It is a figure which shows an example of a structure of the disconnecting switch unit with a ground switch (lower side). It is a figure which shows an example of a structure of the disconnecting switch unit with an earthing switch (upper side). It is a figure which shows the other structural example of a disconnecting switch unit with a ground switch (lower side). It is an internal block diagram which shows Example 2 of this invention. It is a figure which shows the structural example of the power receiving unit of the conventional cubicle type gas insulated switchgear.

  The present invention will be described below with reference to the drawings.

  FIG. 1 is a cross-sectional view of a vertical side surface showing the internal configuration of a power receiving panel of a gas insulated switchgear. In the figure, the left side of the apparatus is the front side, and the right side of the apparatus is the back side.

  The main circuit devices of the circuit breaker unit 1, the power receiving side disconnector unit 2, the busbar side disconnector unit (lower side) 3, and the busbar side disconnector unit (upper side) 4 are accommodated in the gas insulating container 100a of the power receiving panel. Each device is connected by a main circuit conductor. An operation mechanism for each device is disposed on the front side of the power receiving panel, and a cable head 6 serving as a connecting portion of the power receiving cable 5 is disposed on the rear side.

  The circuit breaker unit 1 includes a circuit breaker 1a and an operating device 1b, and the unit is installed in the gas hermetic container 100a. Blade-type grounding devices 1c and 1d are installed on the gas compartment side of the back plate to which the circuit breaker operating device 1b is attached, so that both poles of the circuit breaker 1a can be grounded.

  The power receiving side disconnector unit 2 includes a power receiving side disconnector 2a, a power receiving side ground switch 2b, and an arrester 2c, and the unit is installed in the gas hermetic container 100a.

  The inside of the gas insulating container 100a is divided into two regions by a partition plate 100b in two areas on the busbar side and the power receiving side. The partition plate 100b is provided with an insulating spacer 100c that secretly connects the two regions on the bus side and the power receiving side. The circuit breaker 1a on the power receiving side and the busbar side disconnector unit (lower side) 3 on the busbar side are electrically connected via the insulating spacer 100c.

  The bus-side disconnector unit (lower side) 3 is constituted by a disconnector 3a with a grounding switch arranged at the lower side, and the grounding electrode 3b is located on the axis of the disconnector with the busbar-side electrode 3c interposed therebetween. It is installed on the opposite side of 3l, that is, on the back side of the gas insulated switchgear.

  The bus-side disconnector unit (upper side) 4 is composed of an upper-disposed disconnecting switch 4a with a grounding switch, and the grounding electrode 4b is on the operating unit 4h side on the axis of the disconnecting switch, that is, the front surface of the gas insulated switchgear. It is installed on the side.

  The double bus bars are arranged on the rear bus bar 7a and the front bus bar 7b when viewed from the front side of the apparatus. The power is received by the cable head 6 and connected to the power receiving side disconnector unit 2 at the lower part of the apparatus via the power receiving cable 5.

  The circuit is connected to the circuit breaker unit 1 when the power receiving side disconnector 2a is in the “ON” state. It connects with the disconnecting switch unit (lower side) 3 with a ground switch via the circuit breaker 1a. The disconnector 3a with the grounding switch disposed at the lower side is set to the “ON” state and connected to the bus 7a.

  When the disconnecting switch unit 4a with the grounding switch disposed on the upper side of the disconnecting switch unit (upper side) 4 with the grounding switch is set to the “ON” state, the circuit is switched to the bus bar 7b. In FIG. 1, when the disconnecting switch 4 a with the grounding switch placed on the upper side is in the “on” state, both the buses 7 a and 7 b are energized. The entire bus switching is realized by combining two devices, one VCT, and one bypass DS.

  At the time of inspection, the bus bar 7a and the bus bar 7b can be grounded by setting the disconnector 4a with the grounding switch on the upper side and the disconnector 3a with the grounding switch on the lower side to the "grounding" state.

  Generally, in the C-GIS in the form of a double bus, in order to save space, the three-phase conductors of the bus 7a and the three-phase conductors of the bus 7b arranged in the width direction of the device are arranged in the depth direction of the device. Place in parallel.

  In this arrangement, in the conventional structure (FIG. 6), the earthing pole of the earthing switch is arranged on the operating device side. For this reason, in order to switch the buses and arrange the respective busbars to be grounded in a state in which the operation device of the device is arranged on the front surface of the apparatus, a ground switch is provided on each busbar, and two disconnectors are provided. Must be provided. In this case, since it arrange | positions ensuring the insulation distance between a disconnecting switch and a grounding switch, an apparatus height direction becomes high and it enlarges.

  In addition, when using a disconnect switch with a ground switch, the conventional structure has a ground pole on the side of the operating unit. Therefore, in order to switch each bus to ground, Since the operation device of the container is separately installed on the front surface and the back surface of the device, the size of the device is increased in the depth direction of the device, and the operability of the gas insulated switchgear is lowered.

  On the other hand, in the embodiment of the present invention (FIG. 1), in the disconnector with a grounding switch arranged up and down, the disconnecting switch 4a with the grounding switch arranged on the upper side is connected to the bus bar 7b arranged in front of the apparatus, 4b is installed on the front side. Further, the disconnecting switch 3a with the grounding switch disposed on the lower side is connected to the bus 7a on the back side of the apparatus, and the grounding electrode 3b is disposed on the back side of the apparatus.

  In this way, by arranging the grounding poles of the disconnecting switch with grounding switch placed up and down on the front side and the back side in the device depth direction, switching the busbars while placing the operating device on the front side of the device, and switching each busbar Since it is possible to ground independently, and it is not necessary to install a grounding switch and disconnect switch separately, it is possible to reduce the height of the grounding switch in the device height direction. .

  An example of the configuration of the disconnecting switch unit (lower side) 3 with the ground switch is shown in FIG. The supporting insulating cylinder 3d and the circuit side electrode 3e have an integral structure, and the circuit side electrode 3e is electrically connected to the main circuit conductor 3f. The main circuit conductor 3f is electrically connected to the circuit breaker 1a at the other end. A contact 3g is provided inside the circuit side electrode 3e, and electrical contact is made between the mover 3h and the circuit side electrode 3e.

  The circuit side electrode 3e, the bus bar side electrode 3c, and the grounding electrode 3b are arranged on the same axis, and the movable element 3h moves on the disconnector shaft from the front side to the back side of the device. The ground state and state change.

  The mover 3h moves on the disconnector shaft by the rotational movement of the screw-like insulating rod 3i. In the ground state, the bus-side electrode 3c is grounded. The operation by the screw-shaped insulating rod may be moved by moving the insulating rod by pushing and pulling.

  An example of the configuration of the disconnecting switch unit with an earthing switch (upper side) 4 is shown in FIG. The supporting insulating cylinder 4c and the bus bar side electrode 4d have an integral structure. A contact 4e is provided inside the bus-side electrode 4d, and electrical contact is made between the mover 4f and the bus-side electrode 4d.

  A ground electrode 4b is provided inside the support insulating cylinder 4c. A main circuit side electrode 4i is provided at a position facing the bus bar side electrode 4d. The supporting insulating cylinder 4c, the grounding electrode 4b, the bus bar side electrode 4d, and the main circuit side electrode 4i are arranged on the same axis, and the movable element 4f moves on the disconnector shaft from the front side to the back side of the device, The state changes from a grounded state to a disconnected state and a closed state.

  The mover 4f moves on the disconnector shaft by the rotational movement of the screw-like insulating rod 4g. In the ground state, the bus-side electrode 4d is grounded. The operation by the screw-shaped insulating rod may be moved by moving the insulating rod by pushing and pulling.

  In the embodiment shown in FIG. 1, by arranging the disconnecting switch unit with the grounding switch shown above up and down, the disconnecting switch 4a with the grounding switch arranged on the upper side is connected to the bus 7b arranged in front of the device, The ground electrode 4b is installed on the front side. Further, the disconnecting switch 3a with the grounding switch disposed on the lower side is connected to the bus 7a on the back side of the apparatus, and the grounding electrode 3b is disposed on the back side.

  In this way, by arranging the grounding poles of the disconnecting switch with grounding switch placed up and down on the front side and the back side in the device depth direction, switching the busbars while placing the operating device on the front side of the device, and switching each busbar It becomes a structure that can be grounded independently.

  In the present embodiment, in the disconnecting switch unit (upper side) 4 with the ground switch, the movable element 4f and the contact element 4e, and the movable element 4f and the main circuit side electrode 4i are in contact with each other (FIG. 3 (3)). The mover 4f moves away from the main circuit side electrode 4i by the operation of “pulling” of the operating device in which the mover 4f moves toward the front of the device, and an electrical disconnection is performed between the bus 7b and the bus 7a on the front side of the device ( 3 (2)), and by further performing a “pull” operation, the grounding electrode 4b on the front side of the apparatus, the mover 4f, and the bus 7b come into contact with each other, and the bus 7b is grounded (FIG. 3 (1)).

  Due to the operation of “pushing” the operating unit that moves the mover 4f from the grounded state toward the back of the apparatus, the grounding is switched to the disconnection, and the disconnection is switched to the closing state.

  Further, in the disconnecting switch unit (lower side) 3 with a grounding switch, the grounding electrode 3b is disposed on the back side of the device, and the movable element 3h and the circuit side electrode 3e, and the movable element 3h and the bus bar side electrode 3c are in contact with each other. The circuit-side electrode 3e and the mover 3h are separated from the main circuit conductor 3f and the device by the "pushing" operation of the operation device in which the mover 3h moves in the direction toward the back of the device from the charged state (FIG. 2 (1)). Conducting electrical disconnection with the bus 7a on the back side (FIG. 2 (2)), and further performing a “push” operation, the grounding pole 3b, the mover 3h and the bus 7a come into contact with each other, and the bus 7a is grounded. It is done (FIG. 2 (3)).

  As a result, the bus bar 7a can be grounded while the operation device is disposed on the front surface of the apparatus. By the “pull” operation of moving the mover 3h from the grounding direction toward the front of the apparatus, the grounding is switched to the disconnection, and the disconnection is switched to the closing state.

  As described above, in the present embodiment, the bus bar switching and grounding can be realized by arranging the operation device on the front surface of the apparatus. In the conventional structure shown in FIG. 6, bus switching and bus grounding are performed by two grounding switches and two disconnecting switches.

  In this embodiment, it is not necessary to separately install a grounding switch and a disconnecting switch with respect to the conventional structure of FIG. 6, so the length of the main circuit conductor arranged in the vertical direction in the disconnecting switch unit portion is grounded with respect to the conventional structure. It is possible to shorten the two switch heights and the insulation distance required for the ground switch.

  Furthermore, in this embodiment, since the operation devices of the respective devices can be installed on the front surface of the apparatus, the apparatus height can be reduced without changing the apparatus depth length, and the gas insulated switchgear can be miniaturized.

  Different embodiments of the invention are shown below. FIG. 4 shows a configuration example of the disconnecting switch unit (lower side) 3 with a ground switch. The supporting insulating cylinder 3d and the circuit side electrode 3e have an integral structure, and the circuit side electrode 3e is electrically connected to the main circuit conductor 3f. The main circuit conductor 3f is electrically connected to the circuit breaker 1a at the other end.

  A grounding electrode 3j is provided inside the supporting insulating cylinder 3d. Further, the mover 3k is disposed on the front side of the apparatus inside the supporting insulating cylinder 3d. A contact 3g is provided inside the circuit side electrode 3e, and electrical contact is made between the mover 3h and the circuit side electrode 3e.

  The circuit side electrode 3e, the bus bar side electrode 3c, the grounding electrode 3b, and the grounding electrode 3j are arranged on the same axis, and the movable element 3h moves on the disconnector shaft from the front side to the back side of the device, thereby turning on. The state changes from (1) to disconnected state (2) and grounding state (3).

  When the mover 3h is in the ground state, the mover 3k simultaneously brings the ground electrode 3j and the circuit side electrode 3e into electrical contact with each other, thereby bringing the circuit side electrode 3e into the ground state.

  The mover 3h and the mover 3k move on the disconnector shaft by the rotational movement of the screw-like insulating rod 3i. In addition, you may move the operation | movement by a screw-shaped insulating rod by the movement by pushing and pulling of an insulating rod.

  In the ground state, the ground electrode 3b grounds the bus-side electrode 3c, and the ground electrode 3j grounds the circuit-side electrode 3e.

  In addition to the above configuration, the charged charge of the main circuit conductor on the circuit breaker side can be grounded by replacing the power receiving side disconnector 2a of the power receiving side disconnector unit 2 in Embodiment 1 with a disconnector with a ground switch.

  With the above configuration, it is possible to ground the charge of the main circuit conductor of the circuit breaker bipolar without installing the blade type grounding devices 1c and 1d on both polar sides of the circuit breaker 1a, and downsizing the device while reducing the number of parts. (Fig. 5).

  DESCRIPTION OF SYMBOLS 1a ... Circuit breaker, 1b ... Circuit breaker operation device, 1c, 1d ... Blade type grounding device, 2a ... Power receiving side disconnect switch, 2b ... Power receiving side ground switch, 2c ... Arrestor, 3a: Disconnector with ground switch on the lower side, 3b ... Grounding electrode, 3c ... Bus side electrode, 3d ... Support insulation cylinder, 3e ... Circuit side electrode, 3f ..Main circuit conductor, 3g ... contact, 3h ... mover, 3i ... insulating rod, 3j ... grounding pole, 3k ... mover, 3l ... operator, 4a ..Disconnector with grounding switch arranged on the upper side, 4b ... grounding electrode, 4c ... support insulation cylinder, 4d ... bus side electrode, 4e ... contact, 4f ... mover, 4g ... Insulating rod, 4h ... Operator, 4i ... Main circuit side electrode, 5 ... Power receiving cable, 6 ... Cable head, 7a, 7 ... bus,

Claims (4)

In a gas-insulated switchgear comprising a main circuit device having at least a disconnector, a ground switch, a circuit breaker, and a disconnector with a ground switch in a gas insulating container filled with an insulating gas,
The inside of the gas insulating container is divided into two regions by a partition plate on the bus side and the power receiving side,
On the back side of the gas insulating container, a cable head for drawing a power receiving cable into the power receiving side region is arranged,
The power receiving cable is electrically connected to the power receiving side disconnector, the power receiving side ground switch and the arrester in the power receiving side region,
The circuit breaker is electrically connected to the power receiving cable through the power receiving side disconnector in the region on the power receiving side,
The circuit breaker is electrically connected to a disconnector with a grounding switch disposed on the busbar side through an insulating spacer that is provided on the partition plate and secretly connects the divided area. And
The disconnector with a grounding switch disposed on the lower side has a grounding electrode on the back side of the gas insulating container, and has a bus-side electrode on the grounding electrode side of the electrical connection with the circuit breaker. ,
The bus bar side electrode is electrically connected to one bus bar via the main circuit side electrode of the disconnect switch with ground switch on the upper side,
The disconnect switch with the ground switch of the upper arrangement has a ground electrode on the front side of the gas insulation container,
A gas insulated switchgear characterized in that the other busbar is connected between the main circuit electrode and the grounding electrode of the disconnector with grounding switch arranged on the upper side. The gas insulated switchgear according to claim 1,
The power-reception-side disconnector, the power-reception-side ground switch, the circuit breaker, the lower-arranged disconnector with a grounding switch, and the upper-arranged disconnector with a grounding switch are the front side of the gas insulation container. A gas insulated switchgear characterized by being arranged on the side. The gas insulated switchgear according to claim 1 or 2,
A gas-insulated switchgear having a blade-type grounding device at both poles of the circuit breaker. The gas insulated switchgear according to claim 1 or 2,
Instead of the disconnector with the ground switch of the lower arrangement, two ground electrodes, a circuit side electrode and a bus bar side electrode provided between the two ground electrodes, the circuit side electrode and the bus bar side electrode The two movers for grounding each of the two grounding poles are arranged coaxially to constitute a disconnector with a grounding switch disposed on the lower side,
In the charged state, the one mover for short-circuiting the bus-side electrode bridges the circuit-side electrode and the bus-side electrode,
In the ground state, each of the movers grounds the circuit side electrode and the bus side electrode,
A gas insulated switchgear comprising a disconnector with a ground switch instead of the power receiving side disconnector.