Gas insulated switchgear

Abstract

To provide a gas insulation switchgear in which a wire for transmitting power is protected while suppressing increase of a structure to be installed outside a tank.SOLUTION: A gas insulation switchgear 100 comprises: a tank 10 in which insulation gas is encapsulated; an operation device 30 with a drive pulley 31 rotated by a motor 32; an opening / closing operation device 20 with an opening / closing operation unit 25 which performs an opening / closing operation in the tank 10 and a driven pulley 22 which rotates in accordance with rotation of the drive pulley 31 to transmit force of the opening / closing operation to the opening / closing operation unit 25; a wire 40 which transmits torque from the drive pulley 31 to the driven pulley 22; a gas gauge 50 which measures pressure of the insulation gas in the tank 10; a gas piping 60 which connects the tank 10 with the gas gauge 50; and a first wire piping 71 which branches at a first branching part 61 of the gas piping 60 to be connected with the operation device 30. The wire 40 is bridged over the drive pulley 31 and the driven pulley 22 through the gas piping 60 and the first wire piping 71.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present disclosure relates to a gas-insulated switchgear including a circuit breaker and an earthing switch.

Background Art

[0002] Conventionally, in a gas-insulated switchgear, for the purpose of miniaturizing switching operation devices installed in a tank, such as a circuit breaker and an earthing switch, and performing a switching operation, as disclosed in Patent Document 1, a structure is adopted in which an operating device that transmits torque to the switching operation device to perform a switching operation is separated from the switching operation device and installed separately.

[0003] As disclosed in Patent Document 1, in a gas-insulated switchgear in which an operating device is separated from a circuit breaker and a switch, the circuit breaker, the switch, and the operating device are connected using a wire for power transmission. Pulleys are installed on the shafts of the circuit breaker and the switch and the output shaft of the motor of the operating device. By rotating the pulley on the operating device side with a motor, transmitting power through a wire, and rotating the pulley on the circuit breaker and switch side, a switching operation is performed.

[0004] The wire stretched between the pulleys of the circuit breaker and the switch and the pulley of the operating device is protected by passing through a metal tube such as a pre-cable tube.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0006] However, in the above conventional gas-insulated switchgear, since it is necessary to install a metal tube dedicated to protecting the wire outside the tank, the structures installed outside the tank increase, which may impose restrictions on the layout of the device.

[0007] This disclosure has been made in view of the above, and aims to provide a gas-insulated switchgear that protects power transmission wires while suppressing an increase in the number of structures installed outside the tank. [Means for solving the problem]

[0008] To solve the above-mentioned problems and achieve the objective, the gas-insulated switchgear according to this disclosure comprises a tank filled with insulating gas, an operating device equipped with a motor and a drive pulley rotated by the motor, a switchgear equipped with a switchgear unit that performs switching operations within the tank and a driven pulley that rotates in conjunction with the rotation of the drive pulley and transmits the force of the switching operation to the switchgear unit, a wire that transmits torque from the motor from the drive pulley to the driven pulley, a gas gauge that measures the pressure of the insulating gas in the tank, a gas pipe connecting the tank and the gas gauge, and a first wire pipe that branches off from the gas pipe at a first branching point and is connected to the operating device. The wire is stretched between the drive pulley and the driven pulley through the gas pipe and the first wire pipe. [Effects of the Invention]

[0009] According to this disclosure, it is possible to provide a gas-insulated switchgear that protects power transmission wires while suppressing an increase in the number of structures installed outside the tank. [Brief explanation of the drawing]

[0010] [Figure 1] Diagram showing the configuration of a gas-insulated switchgear according to Embodiment 1. [Figure 2] Diagram showing the Geneva mechanism of a gas-insulated switchgear according to Embodiment 1. [Figure 3] This figure shows the state in which the pin of the driven pulley of the Geneva mechanism of the gas-insulated switchgear according to Embodiment 1 has moved to the outer diameter side of the slot. [Figure 4] This figure shows the state of the Geneva mechanism when the switching operation device of the gas-insulated switchgear according to Embodiment 1 is in the closed state. [Figure 5]Enlarged view of the connection between the operating device of the gas-insulated switchgear according to Embodiment 1 and the first wire piping. [Modes for carrying out the invention]

[0011] A gas-insulated switchgear according to an embodiment will be described in detail below with reference to the drawings.

[0012] Embodiment 1. Figure 1 shows the configuration of a gas-insulated switchgear according to Embodiment 1. The gas-insulated switchgear 100 according to Embodiment 1 includes a tank 10 filled with insulating gas. Inside the tank 10 are switchgear 20, including a circuit breaker (not shown), a disconnector, and a grounding switch. The gas-insulated switchgear 100 also includes an operating device 30, which is the power source for the switchgear operation of the switchgear 20. The operating device 30 includes a motor 32 on which a drive pulley 31 is installed. The switchgear 20 includes a switchgear operation unit 25 equipped with a movable contact 25a and a fixed contact 25b, and a Geneva mechanism 21 that converts continuous rotation into intermittent rotation. The switchgear 20 is in a closed state when the movable contact 25a contacts the fixed contact 25b, and in an open state when the movable contact 25a moves away from the fixed contact 25b. The opening / closing device 20 performs an opening / closing operation by rotating the drive pulley 31 on the operating device 30 side with the motor 32, and rotating the driven pulley 22 on the Geneva mechanism 21 side with the power transmitted by the wire 40, thereby switching between the open and closed states.

[0013] Figure 2 shows a Geneva mechanism of a gas-insulated switchgear according to Embodiment 1. The Geneva mechanism 21 includes a driven pulley 22 that rotates in the same direction as the drive pulley 31, a driven wheel 23 that rotates intermittently with respect to the rotation of the driven pulley 22, and a shaft 24 provided on the driven wheel 23. The driven pulley 22 is provided with a pin 27 on one end face in the axial direction. The driven wheel 23 is pivotally supported by the housing of the Geneva mechanism 21. The driven wheel 23 is positioned such that the side opposite to the side on which the shaft 24 is provided faces the side of the driven pulley 22 on which the pin 27 is provided. The radius of the driven wheel 23 is greater than the radius of the driven pulley 22. The driven wheel 23 is provided with a slot 28 into which the pin 27 engages. The slot 28 is, for example, V-shaped, with two radially extending portions connected at the center of the driven wheel 23. The pin 27 is guided into the slot 28 and moves within the slot 28 as the driven pulley 22 rotates. The driven wheel 23 remains stationary and does not follow the driven pulley 22 when the pin 27 is in the center of the slot 28, and follows the driven pulley 22 when the pin 27 is in a part of the slot 28 other than the center. The driven wheel 23 operates intermittently to operate the movable contact 25a of the opening / closing device 20 within a preset drive range. In other words, the positional relationship between the pin 27 and the slot 28 is set to realize such operation of the driven wheel 23. The shaft 24 is the shaft that drives the movable contact 25a of the opening / closing device 20 and is directly or indirectly connected to the movable contact 25a. The driven wheel 23 drives the movable contact 25a of the opening / closing device 20 via the shaft 24. Figure 2 shows the Geneva mechanism 21 when the opening / closing device 20 is in the open state, with the movable contact 25a and the fixed contact 25b separated.

[0014] The operation of the switching mechanism 20 from the open state to the closed state will now be described. When the switching mechanism 20 is in the open state, the Geneva mechanism 21 has a pin 27 positioned in the center of the slot 28, and the driven wheel 23 is not driven by the driven pulley 22. In this state, when the motor 32 is rotated forward and the drive pulley 31 is rotated, the driven pulley 22 also rotates forward via the wire 40, and the pin 27 moves towards the outer diameter side within the slot 28. Figure 3 shows the state in which the pin of the driven pulley of the Geneva mechanism of the gas-insulated switchgear according to Embodiment 1 has moved towards the outer diameter side of the slot. The driven pulley 22 rotates freely until the pin 27 moves a certain distance radially within the slot 28 from the center of the V-shape of the slot 28, and thereafter the pin 27 and the slot 28 mesh, and the rotation of the driven pulley 22 is transmitted to the driven wheel 23. After the pin 27 moves outward within the slot 28, causing the driven wheel 23 to rotate in the forward direction, the pin 27 changes direction of movement within the slot 28 and moves inward, causing the driven wheel 23 to rotate further in the forward direction. As a result, the movable contact 25a contacts the fixed contact 25b, and the switching mechanism 20 closes. Figure 4 shows the state of the Geneva mechanism when the switching mechanism of the gas-insulated switchgear according to Embodiment 1 is in the closed state. When the switching mechanism 20 is in the closed state, the driven pulley 22 rotates freely again, causing the driven wheel 23 to stop, and the movable contact 25a of the switching mechanism 20 stops in contact with the fixed contact 25b. The motor 32 is controlled to stop while the driven pulley 22 is rotating freely after the switching mechanism 20 is in the closed state.

[0015] The operation of the opening / closing mechanism 20 from the closed state to the open state will now be described. When the opening / closing mechanism 20 is in the closed state, the Geneva mechanism 21 has a pin 27 positioned in the center of the slot 28, and the driven wheel 23 is not driven by the driven pulley 22. In this state, when the motor 32 is rotated in reverse and the drive pulley 31 is rotated, the driven pulley 22 also rotates in reverse via the wire 40, and the pin 27 moves outward within the slot 28. The driven pulley 22 rotates freely until the pin 27 moves a certain distance radially within the slot 28 from the center of the V-shape of the slot 28. After that, the pin 27 and the slot 28 engage, and the rotation of the driven pulley 22 is transmitted to the driven wheel 23. After the pin 27 moves outward within the slot 28 and rotates the driven wheel 23 in reverse, the pin 27 changes direction of movement within the slot 28 and moves inward, further rotating the driven wheel 23 in reverse. As a result, the movable contact 25a separates from the fixed contact 25b, and the opening / closing mechanism 20 opens. When the opening / closing mechanism 20 is open, the driven pulley 22 starts to spin freely again, causing the driven wheel 23 to stop, and the movable contact 25a of the opening / closing mechanism 20 stops separated from the fixed contact 25b. The motor 32 is controlled to stop while the driven pulley 22 is spinning freely after the opening / closing mechanism 20 has opened.

[0016] As described above, the Geneva mechanism 21 is a mechanism that converts continuous rotation into intermittent rotation and has the function of absorbing the lack of movement due to elongation, which is a weakness unique to the wire 40. A free-spinning region is provided in the slot 28 at the opening and closing operation completion position, and the driven wheel 23 does not rotate even if the driven pulley 22 rotates excessively, so that the opening and closing operation device 20 can operate at a constant rate without being affected by the elongation of the wire 40.

[0017] The gas-insulated switchgear 100 is equipped with a gas gauge 50 for measuring the pressure of the insulating gas in the tank 10. The gas gauge 50 is connected to the tank 10 by a gas pipe 60. The gas pipe 60 has a first branch 61 and a second branch 62. The first branch 61 is connected to the operating device 30 by a first wire pipe 71. The second branch 62 is connected to the Geneva mechanism 21 by a second wire pipe 72. The wire 40 is stretched between the drive pulley 31 of the operating device 30 and the driven pulley 22 of the Geneva mechanism 21 through the first wire pipe 71, the portion of the gas pipe 60 between the first branch 61 and the second branch 62, and the second wire pipe 72. Hereinafter, the portion of the gas pipe 60 between the first branch 61 and the second branch 62 will be referred to as the shared gas wire pipe 81. The first wire pipe 71, the second wire pipe 72, and the gas pipe 60 are made of metal and are not flexible.

[0018] Figure 5 is an enlarged view of the connection between the operating device and the first wire piping of the gas-insulated switchgear according to Embodiment 1. The operating device 30 has an O-ring 38 and an X-ring 39 installed at the connection point with the first wire piping 71. The insulating gas in the first wire piping 71 is blocked by the O-ring 38, preventing it from leaking out through the gap between the operating device 30 and the first wire piping 71. Furthermore, the insulating gas in the first wire piping 71 is blocked by the X-ring 39, preventing it from flowing into the operating device 30. The same applies to the connection point between the Geneva mechanism 21 and the second wire piping 72, where an O-ring 38 and an X-ring 39 are installed at the connection point between the Geneva mechanism 21 and the second wire piping 72. Therefore, the insulating gas in the second wire piping 72 is blocked by the O-ring 38 and X-ring 39, preventing it from leaking out through the gap between the Geneva mechanism 21 and the second wire piping 72, or from flowing into the interior of the Geneva mechanism 21.

[0019] The wire 40 has a structure in which a metal inner 41 is covered with a resin outer 42. When the drive pulley 31 of the operating device 30 rotates, only the inner 41 moves along with the rotation of the drive pulley 31, but the position of the outer 42 does not change. Therefore, no friction is generated between the X-ring 39 and the wire 40 due to the movement of the wire 40. Thus, it is difficult for the airtightness by the X-ring 39 to deteriorate.

[0020] In the gas-insulated switchgear 100 according to the first embodiment, since the wire 40 spanned between the operating device 30 and the Geneva mechanism 21 is covered by the first wire pipe 71, the gas-wire shared pipe 81, and the second wire pipe 72, the wire 40 can be protected. By protecting the wire 40 using the gas-wire shared pipe 81, compared with the case where a pre-cable for protecting the wire 40 is provided separately from the gas pipe 60, the structures outside the tank 10 can be reduced, and the restrictions on the device layout can be minimized.

[0021] Also, since the first wire pipe 71, the second wire pipe 72, and the gas pipe 60 do not have flexibility, structures for holding the first wire pipe 71, the second wire pipe 72, and the gas pipe 60 are unnecessary. Therefore, the structures outside the tank 10 can be reduced, and the restrictions on the device layout can be minimized.

[0022] The configurations shown in the above embodiments are examples of the content, and it is possible to combine them with other known technologies, and it is also possible to omit or change a part of the configuration without departing from the gist.

Explanation of Reference Numerals

[0023] 10 Tank, 20 Opening / closing mechanism, 21 Geneva mechanism, 22 Driven pulley, 23 Driven wheel, 24 Shaft, 25 Opening / closing unit, 25a Movable contact, 25b Fixed contact, 27 Pin, 28 Slot, 30 Operating device, 31 Drive pulley, 32 Motor, 38 O-ring, 39 X-ring, 40 Wire, 41 Inner, 42 Outer, 50 Gas gauge, 60 Gas piping, 61 First branch, 62 Second branch, 71 First wire piping, 72 Second wire piping, 81 Gas wire shared piping, 100 Gas-insulated switchgear.

Claims

1. a tank filled with insulating gas; an operating device including a motor and a drive pulley rotated by the motor; an opening / closing device including an opening / closing operation unit that performs an opening / closing operation inside the tank, and a driven pulley that rotates in accordance with the rotation of the drive pulley and transmits the force of the opening / closing operation to the opening / closing operation unit; a wire for transmitting torque generated by the motor from the driving pulley to the driven pulley; a gas gauge for measuring the pressure of the insulating gas in the tank; a gas pipe connecting the tank and the gas gauge; a first wire pipe branching from the gas pipe at a first branching portion and connected to the operating device; The gas-insulated switchgear is characterized in that the wire is laid across the drive pulley and the driven pulley through the gas piping and the first wire piping.

2. 2. The gas-insulated switchgear according to claim 1, wherein the switching operation device comprises a Geneva mechanism having the driven pulley and a driven wheel that intermittently follows the driven pulley.

3. The Geneva mechanism is installed outside the tank, a second wire pipe branching from the gas pipe at a position closer to the opening / closing device than the first branching portion; 3. The gas-insulated switchgear according to claim 2, wherein the wire is laid across the drive pulley and the driven pulley through the second wire pipe in addition to the gas pipe and the first wire pipe.

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