An environmentally friendly gas switch cabinet for a ring network system and an operating method thereof

Abstract

The present invention relates to an environmentally friendly gas switch cabinet for a ring network system, characterized in that it comprises a frame, a gas box, a switch device, an upper door panel, and a lower door panel; the upper door panel is arranged at the upper front of the frame, and the lower door panel is arranged at the lower front of the frame; the grounding switch directly closes the short-circuit fault current of the cable outlet, which is simple to operate; the grounding knife adopts silver carbide contacts arranged in a herringbone shape, which has a stronger short-circuit closing capability than copper tungsten materials; the movable contact and the static contact of the isolating switch are both installed in a shielding cover, which optimizes the electric field structure; a fully sealed and fully insulated gas box made of welded stainless steel is arranged outside the switch cabinet frame, and the gas box adopts a three-dimensional shape structure and is internally provided with an insulating plate, which improves the arc-proof performance of the gas box frame.

Description

Technical Field

[0001] The present invention relates to the technical field of environmentally friendly gas switch cabinets, and in particular to an environmentally friendly gas switch cabinet for a ring network system and an operating method thereof. Background Art

[0002] Currently, switchgear available in China is primarily categorized into air-insulated ring main units (RMUs), SF6 gas-insulated RMUs, solid-state insulated RMUs, and environmentally friendly gas-insulated RMUs. Air-insulated RMUs are bulky; SF6 gas-insulated RMUs are currently the most widely used, but SF6 is a major greenhouse gas; solid-state insulated RMUs exhibit unstable partial discharge (PD) indicators, and the insulation material is difficult to degrade and subsequently recycle. There are three main types of environmentally friendly gas-insulated RMUs: atmospheric-pressure sealed insulated RMUs, synthetic gas-insulated RMUs, and natural gas-insulated RMUs. Atmospheric-pressure sealed insulated RMUs incorporate a filter system to effectively isolate dust, moisture, and contaminants from the operating environment, while also ensuring pressure balance inside and outside the sealed enclosure. While this somewhat addresses the gas leakage issues associated with air-filled RMUs, while maintaining switch insulation performance, they are larger and require more space. Synthetic gas-insulated RMUs primarily utilize gases equivalent to C4 and C5. Due to their presence of PFAS, which are biotoxic and environmentally polluting, they have been banned in many regions internationally. The natural and environmentally friendly gas insulated ring network cabinet is made by vacuuming the gas box and then filling it with dry air of a certain pressure value, so that the switch cabinet can meet the insulation capacity required by the technology, and has achieved good application results in actual operation. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide an environmentally friendly gas switch cabinet for a ring network system and an operating method thereof, which can solve the environmental protection problems of general environmentally friendly gas switch cabinets, as well as the problems of complex grounding operation, large size compared to SF6 ring network cabinets, inadequate and unreasonable switch design, and short life.

[0004] To solve the above technical problems, the technical solution of the present invention is: an environmentally friendly gas switchgear for a ring network system, the innovation of which is that it includes a frame, a gas box, a switch device, an upper door panel and a lower door panel; the upper door panel is arranged at the upper front of the frame, and the lower door panel is arranged at the lower front of the frame;

[0005] The frame is a rectangular parallelepiped structure, and a sealing plate structure is provided around the frame; a support frame for installing a switch device is provided inside the frame; the gas box is provided on the outside of the sealing plate on the frame, and an insulating plate is provided inside the gas box;

[0006] The switch device is arranged at the upper rear portion of the frame, and includes a circuit breaker switch, a circuit breaker mechanism, a three-position switch, a three-position mechanism, and an interlocking device; the three-position switch is arranged below the circuit breaker switch and is fixedly connected to the circuit breaker switch;

[0007] The circuit breaker switch includes a vacuum interrupter, a fixed insulating cylinder, an overtravel spring assembly, an insulating shield, a circuit breaker transmission shaft, and a circuit breaker cam; the circuit breaker mechanism is in transmission connection with the circuit breaker; the circuit breaker cam is fixedly connected to the circuit breaker transmission shaft, and the overtravel spring assembly is connected above the circuit breaker cam; the vacuum interrupter is connected above the overtravel spring assembly;

[0008] The three-position switch includes an isolating static contact, an insulating transmission shaft, a three-position movable blade, and a grounding contact; the three-position movable blade is located between the isolating static contact and the grounding contact; one end of the insulating transmission shaft is connected to the three-position movable blade, and the other end of the insulating transmission shaft is connected to an external drive source;

[0009] The switch device also includes a circuit breaker closing button, a circuit breaker opening button, an energy storage operating shaft, an energy storage spring and an external adapter shaft; the interlocking device includes a circuit breaker interlocking plate and an isolation interlocking plate; the energy storage operating shaft is connected to the energy storage spring, a cam is fixed on the external adapter shaft, the cam is connected to the circuit breaker interlocking plate, an isolation interlocking plate is connected above the circuit breaker interlocking plate, and the isolation interlocking plate includes an isolation operating shaft shielding portion and a grounding operating shaft shielding portion.

[0010] The grounding contacts are made of carbide silver contacts and are distributed in a triangular shape.

[0011] An operating method for an environmentally friendly gas switchgear for a ring network system, the innovation of which lies in: the specific operating method is as follows:

[0012] S1: Power outage operation:

[0013] S1.1: Internal action of the switch: The circuit breaker mechanism drives the circuit breaker drive shaft to rotate counterclockwise. The circuit breaker cam fixed on the circuit breaker drive shaft rotates counterclockwise, driving the overtravel spring assembly to pull the vacuum interrupter downward. The contacts inside the vacuum interrupter separate and the circuit breaker opens.

[0014] S1.2: Interlocking device action: The two ends of the circuit breaker dynamic seal are connected to the circuit breaker drive shaft and the external adapter shaft respectively. The circuit breaker drive shaft rotates counterclockwise, causing the cam fixed on the external adapter shaft to rotate counterclockwise, thereby driving the circuit breaker interlocking plate and the isolation interlocking plate to move downward. The isolation operating shaft shielding part and the grounding operating shaft shielding part do not block the isolation operating shaft and the grounding operating shaft; insert the operating handle into the isolation operating shaft and rotate it counterclockwise. The isolation mechanism assembly on the isolation / grounding mechanism drives the isolation drive shaft to rotate clockwise. At the same time, the crank arm assembly connected to the isolation drive shaft drives the isolation movable knife to rotate clockwise. The isolation movable knife separates from the isolation static contact, and the disconnector is opened;

[0015] Insert the operating handle into the grounding operating shaft and rotate it clockwise. The grounding mechanism assembly on the isolation / grounding mechanism drives the isolation drive shaft to rotate clockwise. At the same time, the crank arm assembly connected to the isolation drive shaft drives the isolation movable knife to continue to rotate clockwise. The isolation movable knife connects with the grounding contact, and the grounding switch is closed. At this time, the grounding circuit of the switch is in the conductive state, and the lower door panel can be opened.

[0016] S2: Power supply operation:

[0017] S2.1: After closing the lower door panel, insert the operating handle into the grounding operating shaft and rotate it counterclockwise. The grounding mechanism assembly on the three-position mechanism drives the isolation drive shaft to rotate counterclockwise. At the same time, the crank arm assembly connected to the isolation drive shaft drives the isolation movable knife to rotate counterclockwise, separating the isolation movable knife from the grounding contact, and opening the grounding switch. In addition, the grounding operating shaft rotates counterclockwise, and the rotating pressure plate fixed to the grounding operating shaft rotates counterclockwise, pressing down the baffle on the connecting rod assembly. The grounding interlocking plate fixed to the connecting rod assembly moves downward, pressing the lower door panel. At this time, in the grounding state, the lower door panel cannot be opened.

[0018] Insert the operating handle into the isolation operating shaft and turn it clockwise. The isolation mechanism assembly on the isolation / grounding mechanism drives the isolation drive shaft to rotate counterclockwise. At the same time, the crank arm assembly connected to the isolation drive shaft drives the isolation movable knife to continue to rotate counterclockwise. The isolation movable knife is connected to the isolation static contact, and the isolation switch is closed. Insert the operating handle into the energy storage operating shaft and turn it clockwise to stretch the energy storage spring on the circuit breaker mechanism to the set value, and the circuit breaker mechanism stores energy. Press the circuit breaker closing button, and the switch will operate internally: the circuit breaker mechanism drives the circuit breaker. The drive shaft of the circuit breaker rotates clockwise, and the circuit breaker cam fixed on the drive shaft of the circuit breaker rotates clockwise, driving the overtravel spring assembly to push the vacuum interrupter upward, the contacts inside the vacuum interrupter close, and the circuit breaker is closed. At this time, the entire switch circuit is in the on state; the interlocking device acts: the energy storage spring releases energy, the interlock on the circuit breaker mechanism pushes the external transfer shaft to rotate clockwise, and the cam fixed on the external transfer shaft rotates clockwise, driving the circuit breaker interlocking plate and the isolation interlocking plate to move upward, blocking the isolation operating shaft and the grounding operating shaft.

[0019] Furthermore, a rotating pressure plate is fixed on the grounding operating shaft, and the interlocking device includes a connecting rod assembly, a baffle that cooperates with the rotating pressure plate is connected to the connecting rod assembly, and a grounding interlocking plate is fixed at the lower end of the connecting rod assembly, which is used to lock the lower door panel.

[0020] Furthermore, a knockout bushing is provided above the switch device, and a soft busbar is used to connect the knockout bushing to the isolating / earthing switch.

[0021] The advantages of the present invention are:

[0022] 1) In the present invention, the grounding switch directly closes the short-circuit fault current of the cable outlet, which is simple to operate. The grounding knife uses silver carbide contacts arranged in a herringbone shape, which has a stronger short-circuit closing capability than copper-tungsten materials. The moving and static contacts of the disconnector are both installed in a shielding cover, which optimizes the electric field structure. A fully sealed and fully insulated stainless steel welded gas box is installed outside the switch cabinet frame. The gas box adopts a three-dimensional structure and is equipped with an insulating plate inside, which improves the arc-proof performance of the gas box frame. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0024] Figure 1 The figure is a schematic diagram of the internal structure of an environmentally friendly gas switch cabinet for a ring network system according to the present invention.

[0025] Figure 2 This is a front view of the internal structure of an environmentally friendly gas switch cabinet for a ring network system according to the present invention. DETAILED DESCRIPTION

[0026] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0027] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention as claimed, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort shall fall within the scope of protection of the present invention.

[0028] like Figure 1 Figure 2An environmentally friendly gas switchgear for a ring network system shown includes a frame, a gas box, a switch device, an upper door panel and a lower door panel; the upper door panel is arranged at the upper front of the frame, and the lower door panel is arranged at the lower front of the frame.

[0029] The frame is a rectangular parallelepiped structure, and a sealing plate structure is arranged around the frame; a support frame for installing the switch device is arranged inside the frame; the gas box is arranged on the outside of the sealing plate on the frame, and an insulating plate is arranged inside the gas box.

[0030] The switch device is arranged at the upper rear of the frame, and the switch device includes a circuit breaker switch, a circuit breaker mechanism, a three-position switch, a three-position mechanism and an interlocking device; the three-position switch is arranged below the circuit breaker switch and is fixedly connected to the circuit breaker switch.

[0031] The circuit breaker switch includes a vacuum interrupter, a fixed insulating cylinder 11, an overtravel spring assembly, an insulating shield, a circuit breaker drive shaft 12 and a circuit breaker cam; the circuit breaker mechanism is connected to the circuit breaker transmission; the circuit breaker cam is fixedly connected to the circuit breaker drive shaft 12, and the overtravel spring assembly is connected above the circuit breaker cam; the vacuum interrupter is connected above the overtravel spring assembly.

[0032] The three-position switch includes an isolating static contact, an insulating transmission shaft 21, a three-position movable knife and a grounding contact; the three-position movable knife is located between the isolating static contact and the grounding contact; one end of the insulating transmission shaft is connected to the three-position movable knife, and the other end of the insulating transmission shaft is connected to an external drive source.

[0033] The switch device also includes a circuit breaker closing button, a circuit breaker opening button, an energy storage operating shaft, an energy storage spring and an external adapter shaft; the interlocking device includes a circuit breaker interlocking plate and an isolation interlocking plate; the energy storage operating shaft is connected to the energy storage spring, a cam is fixed on the external adapter shaft, the cam is connected to the circuit breaker interlocking plate, and an isolation interlocking plate is connected above the circuit breaker interlocking plate. The isolation interlocking plate includes an isolation operating shaft shielding portion and a grounding operating shaft shielding portion.

[0034] The grounding contacts are made of carbide silver contacts and are distributed in a triangular shape.

[0035] An operating method for an environmentally friendly gas switchgear for a ring network system, the specific operating method is as follows:

[0036] S1: Power outage operation:

[0037] S1.1: Internal action of the switch: The circuit breaker mechanism drives the circuit breaker drive shaft to rotate counterclockwise. The circuit breaker cam fixed on the circuit breaker drive shaft rotates counterclockwise, driving the overtravel spring assembly to pull the vacuum interrupter downward. The contacts inside the vacuum interrupter separate and the circuit breaker opens.

[0038] S1.2: Interlocking device action: The two ends of the circuit breaker dynamic seal are connected to the circuit breaker drive shaft and the external adapter shaft respectively. The circuit breaker drive shaft rotates counterclockwise, causing the cam fixed on the external adapter shaft to rotate counterclockwise, thereby driving the circuit breaker interlocking plate and the isolation interlocking plate to move downward. The isolation operating shaft shielding part and the grounding operating shaft shielding part do not block the isolation operating shaft and the grounding operating shaft; insert the operating handle into the isolation operating shaft and rotate it counterclockwise. The isolation mechanism assembly on the isolation / grounding mechanism drives the isolation drive shaft to rotate clockwise. At the same time, the crank arm assembly connected to the isolation drive shaft drives the isolation movable knife to rotate clockwise. The isolation movable knife separates from the isolation static contact, and the disconnector is opened;

[0039] Insert the operating handle into the grounding operating shaft and rotate it clockwise. The grounding mechanism assembly on the isolation / grounding mechanism drives the isolation drive shaft to rotate clockwise. At the same time, the crank arm assembly connected to the isolation drive shaft drives the isolation movable knife to continue to rotate clockwise. The isolation movable knife connects with the grounding contact, and the grounding switch is closed. At this time, the grounding circuit of the switch is in the conductive state, and the lower door panel can be opened.

[0040] S2: Power supply operation:

[0041] S2.1: After closing the lower door panel, insert the operating handle into the grounding operating shaft and rotate it counterclockwise. The grounding mechanism assembly on the three-position mechanism drives the isolation drive shaft to rotate counterclockwise. At the same time, the crank arm assembly connected to the isolation drive shaft drives the isolation movable knife to rotate counterclockwise, separating the isolation movable knife from the grounding contact, and opening the grounding switch. In addition, the grounding operating shaft rotates counterclockwise, and the rotating pressure plate fixed to the grounding operating shaft rotates counterclockwise, pressing down the baffle on the connecting rod assembly. The grounding interlocking plate fixed to the connecting rod assembly moves downward, pressing the lower door panel. At this time, in the grounding state, the lower door panel cannot be opened.

[0042] Insert the operating handle into the isolation operating shaft and turn it clockwise. The isolation mechanism assembly on the isolation / grounding mechanism drives the isolation drive shaft to rotate counterclockwise. At the same time, the crank arm assembly connected to the isolation drive shaft drives the isolation movable knife to continue to rotate counterclockwise. The isolation movable knife is connected to the isolation static contact, and the isolation switch is closed. Insert the operating handle into the energy storage operating shaft and turn it clockwise to stretch the energy storage spring on the circuit breaker mechanism to the set value, and the circuit breaker mechanism stores energy. Press the circuit breaker closing button, and the switch will operate internally: the circuit breaker mechanism drives the circuit breaker. The drive shaft of the circuit breaker rotates clockwise, and the circuit breaker cam fixed on the drive shaft of the circuit breaker rotates clockwise, driving the overtravel spring assembly to push the vacuum interrupter upward, the contacts inside the vacuum interrupter close, and the circuit breaker is closed. At this time, the entire switch circuit is in the on state; the interlocking device acts: the energy storage spring releases energy, the interlock on the circuit breaker mechanism pushes the external transfer shaft to rotate clockwise, and the cam fixed on the external transfer shaft rotates clockwise, driving the circuit breaker interlocking plate and the isolation interlocking plate to move upward, blocking the isolation operating shaft and the grounding operating shaft.

[0043] A rotating pressure plate is fixed on the grounding operating shaft, and the interlocking device includes a connecting rod assembly, a baffle that cooperates with the rotating pressure plate is connected to the connecting rod assembly, and a grounding interlocking piece is fixed at the lower end of the connecting rod assembly, which is used to lock the lower door panel.

[0044] A top bushing is provided above the switchgear, and a flexible busbar is used to connect the top bushing to the isolating / earthing switch.

[0045] Those skilled in the art will appreciate that the present invention is not limited to the foregoing embodiments. The foregoing embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and modifications are intended to fall within the scope of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An environmentally friendly gas switchgear for a ring network system, characterized by: It includes a frame, an air box, a switch device, an upper door panel and a lower door panel; the upper door panel is arranged at the upper front of the frame, and the lower door panel is arranged at the lower front of the frame; The frame is a rectangular parallelepiped structure, and a sealing plate structure is provided around the frame; a support frame for installing a switch device is provided inside the frame; the gas box is provided on the outside of the sealing plate on the frame, and an insulating plate is provided inside the gas box; The switch device is arranged at the upper rear portion of the frame, and includes a circuit breaker switch, a circuit breaker mechanism, a three-position switch, a three-position mechanism, and an interlocking device; the three-position switch is arranged below the circuit breaker switch and is fixedly connected to the circuit breaker switch; The circuit breaker switch includes a vacuum interrupter, a fixed insulating cylinder, an overtravel spring assembly, an insulating shield, a circuit breaker transmission shaft, and a circuit breaker cam; the circuit breaker mechanism is in transmission connection with the circuit breaker; the circuit breaker cam is fixedly connected to the circuit breaker transmission shaft, and the overtravel spring assembly is connected above the circuit breaker cam; the vacuum interrupter is connected above the overtravel spring assembly; The three-position switch includes an isolating static contact, an insulating transmission shaft, a three-position movable blade, and a grounding contact; the three-position movable blade is located between the isolating static contact and the grounding contact; one end of the insulating transmission shaft is connected to the three-position movable blade, and the other end of the insulating transmission shaft is connected to an external drive source; The switch device also includes a circuit breaker closing button, a circuit breaker opening button, an energy storage operating shaft, an energy storage spring and an external adapter shaft; the interlocking device includes a circuit breaker interlocking plate and an isolation interlocking plate; the energy storage operating shaft is connected to the energy storage spring, a cam is fixed on the external adapter shaft, the cam is connected to the circuit breaker interlocking plate, an isolation interlocking plate is connected above the circuit breaker interlocking plate, and the isolation interlocking plate includes an isolation operating shaft shielding portion and a grounding operating shaft shielding portion.

2. The environmentally friendly gas switch cabinet for a ring network system according to claim 1, characterized in that: The grounding contacts are made of carbide silver contacts and are distributed in a triangular shape.

3. A method for operating an environmentally friendly gas switchgear for a ring network system, characterized in that: The specific operation method is as follows: S1: Power outage operation: S1.1: Internal action of the switch: The circuit breaker mechanism drives the circuit breaker drive shaft to rotate counterclockwise. The circuit breaker cam fixed on the circuit breaker drive shaft rotates counterclockwise, driving the overtravel spring assembly to pull the vacuum interrupter downward. The contacts inside the vacuum interrupter separate and the circuit breaker opens. S1.2: Interlocking device action: The two ends of the circuit breaker dynamic seal are connected to the circuit breaker drive shaft and the external adapter shaft respectively. The circuit breaker drive shaft rotates counterclockwise, causing the cam fixed on the external adapter shaft to rotate counterclockwise, thereby driving the circuit breaker interlocking plate and the isolation interlocking plate to move downward. The isolation operating shaft shielding part and the grounding operating shaft shielding part do not block the isolation operating shaft and the grounding operating shaft; insert the operating handle into the isolation operating shaft and rotate it counterclockwise. The isolation mechanism assembly on the isolation / grounding mechanism drives the isolation drive shaft to rotate clockwise. At the same time, the crank arm assembly connected to the isolation drive shaft drives the isolation movable knife to rotate clockwise. The isolation movable knife separates from the isolation static contact, and the disconnector is opened; Insert the operating handle into the grounding operating shaft and rotate it clockwise. The grounding mechanism assembly on the isolation / grounding mechanism drives the isolation drive shaft to rotate clockwise. At the same time, the crank arm assembly connected to the isolation drive shaft drives the isolation movable knife to continue to rotate clockwise. The isolation movable knife connects with the grounding contact, and the grounding switch is closed. At this time, the grounding circuit of the switch is in the conductive state, and the lower door panel can be opened. S2: Power supply operation: S2.1: After closing the lower door panel, insert the operating handle into the grounding operating shaft and rotate it counterclockwise. The grounding mechanism assembly on the three-position mechanism drives the isolation drive shaft to rotate counterclockwise. At the same time, the crank arm assembly connected to the isolation drive shaft drives the isolation movable knife to rotate counterclockwise, separating the isolation movable knife from the grounding contact, and the grounding switch is opened. In addition, the grounding operating shaft rotates counterclockwise, and the rotating pressure plate fixed to the grounding operating shaft rotates counterclockwise, pressing down the baffle on the connecting rod assembly. The grounding interlocking plate fixed to the connecting rod assembly moves downward, pressing the lower door panel. At this time, in the grounding state, the lower door panel cannot be opened. Insert the operating handle into the isolation operating shaft and turn it clockwise. The isolation mechanism assembly on the isolation / grounding mechanism drives the isolation drive shaft to rotate counterclockwise. At the same time, the crank arm assembly connected to the isolation drive shaft drives the isolation movable knife to continue to rotate counterclockwise. The isolation movable knife is connected to the isolation static contact, and the isolation switch is closed. Insert the operating handle into the energy storage operating shaft and turn it clockwise to stretch the energy storage spring on the circuit breaker mechanism to the set value, and the circuit breaker mechanism stores energy. Press the circuit breaker closing button, and the switch will operate internally: the circuit breaker mechanism drives the circuit breaker. The drive shaft of the circuit breaker rotates clockwise, and the circuit breaker cam fixed on the drive shaft of the circuit breaker rotates clockwise, driving the overtravel spring assembly to push the vacuum interrupter upward, the contacts inside the vacuum interrupter close, and the circuit breaker is closed. At this time, the entire switch circuit is in the on state; the interlocking device acts: the energy storage spring releases energy, the interlock on the circuit breaker mechanism pushes the external transfer shaft to rotate clockwise, and the cam fixed on the external transfer shaft rotates clockwise, driving the circuit breaker interlocking plate and the isolation interlocking plate to move upward, blocking the isolation operating shaft and the grounding operating shaft.

4. The method for operating an environmentally friendly gas switchgear for a ring network system according to claim 3, characterized in that: A rotating pressure plate is fixed on the grounding operating shaft, and the interlocking device includes a connecting rod assembly, a baffle that cooperates with the rotating pressure plate is connected to the connecting rod assembly, and a grounding interlocking piece is fixed at the lower end of the connecting rod assembly, which is used to lock the lower door panel.

5. The method for operating an environmentally friendly gas switchgear for a ring network system according to claim 3, characterized in that: A top bushing is provided above the switchgear, and a flexible busbar is used to connect the top bushing to the isolating / earthing switch.

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