Gas density relay for GIS equipment

Abstract

The invention provides a gas density relay for GIS (gas insulated switchgear) equipment, which comprises a shell, and a circuit control chamber, a compensation gas chamber and a body gas chamber which are communicated with one another are sequentially arranged in the shell from top to bottom; a plurality of touch switches and pressure gauges are arranged in the circuit control chamber; compensation gas is arranged in the compensation gas chamber and used for guaranteeing gas pressure balance between the compensation gas chamber and the body gas chamber. The body air chamber is connected with an air chamber of the GIS equipment; a pressure measuring element capable of moving up and down is arranged in the compensation air chamber and is also used for isolating a communication path among the circuit control chamber, the compensation air chamber and the body air chamber; a pointer blocking rod is further arranged in the shell, the top end of the pointer blocking rod is connected with the pressure gauge, and the bottom end of the pointer blocking rod is connected with a pressure measuring element. The pointer blocking rod is also connected with a touch switch; when the pointer blocking rod is at an initial point, the touch switch is switched off; and when the pointer blocking rod moves to a preset pressure point, the touch switch is switched on. According to the invention, the hidden danger that the SF6 air pressure of the air chamber quickly leaks to zero pressure is found in advance and early warning is carried out.

Description

Technical Field

[0001] This invention relates to the field of gas density monitoring technology, and in particular to a gas density relay for GIS equipment. Background Technology

[0002] Gas-insulated metal-enclosed switchgear (GIS) has a history of over several decades since its development. Because it houses major components such as circuit breakers, disconnectors, grounding switches, busbars, instrument transformers, surge arresters, bushings, cable terminals, and oil / gas bushings within a sealed metal container filled with insulating gas, it offers advantages such as small size, minimal footprint, immunity to external environmental influences, safe and reliable operation, simple maintenance, and long repair cycles. It is now widely used in various types of substations.

[0003] During on-site operation, under non-internal gas chamber faults, the abnormal rupture of the explosion-proof membrane in the outdoor GIS equipment's gas chamber can lead to a continuous and rapid leakage of SF6 gas, even when the GIS equipment has no protective action and only an SF6 low pressure alarm is triggered. This can cause the GIS equipment to trip due to an internal fault. This is particularly problematic for the numerous unattended sites where maintenance personnel, after receiving dispatch notifications, cannot quickly arrive on-site to verify the actual equipment condition and cannot distinguish whether the low SF6 pressure alarm indicates a slow leak in the gas chamber or that the pressure has already reached zero. Summary of the Invention

[0004] The purpose of this invention is to propose a gas density relay for GIS equipment, which solves the technical problem of how to detect the potential danger of rapid leakage of SF6 gas pressure to "zero pressure" in the gas chamber in advance, and provides data support for jamming situations.

[0005] On the one hand, a gas density relay for GIS equipment is provided, comprising: The housing includes, from top to bottom, an interconnected circuit control chamber, a compensation gas chamber, and a main body gas chamber. The circuit control chamber contains multiple touch switches and pressure gauges. The compensation gas chamber contains compensation gas to ensure pressure balance between the compensation gas chamber and the main body gas chamber. The main body gas chamber is connected to the gas chamber of the GIS equipment. The compensation chamber is equipped with a pressure measuring element that can move up and down. The pressure measuring element is also used to isolate the communication path between the circuit control chamber, the compensation chamber and the main body chamber. The housing also includes a pointer stop bar, the top of which is connected to the pressure gauge, and the bottom of which is connected to the pressure sensing element; the pointer stop bar is also connected to the touch switch. When the pointer stop bar is at the initial point, the touch switch is off; when the pointer stop bar moves to the preset pressure point, the touch switch is on.

[0006] Preferably, the pressure measuring element is convex in shape, with openings at its top and bottom, and its sidewalls are made of a stretchable elastic material.

[0007] Preferably, the top end of the pressure measuring element is fixed to the top wall of the compensation air chamber, and its top opening covers the passage between the circuit control chamber and the compensation air chamber; the bottom end of the pressure measuring element is fixed to the bottom wall of the compensation air chamber, and its bottom opening covers the passage between the compensation air chamber and the main body air chamber.

[0008] Preferably, the bottom end of the pointer stop bar passes through the passage between the circuit control chamber and the compensation gas chamber and is embedded in the top opening of the pressure measuring element, so that it can move with the pressure measuring element.

[0009] Preferably, the touch switch is provided with a magnet and a moving contact; when the pointer stop bar moves to a preset pressure point, the moving contact is attracted to the preset contact point by the magnetic action of the magnet, so that the touch switch is connected; when the pointer stop bar is at the initial point, the moving contact is separated from the preset contact point by the magnetic action of the magnet, so that the touch switch is disconnected.

[0010] Preferably, the trigger switch is connected to the signal circuit of the monitoring and control device, and when its switch state changes, it outputs a corresponding low air pressure alarm signal to the signal circuit of the monitoring and control device.

[0011] Preferably, the trigger switch is also connected to a control circuit, and when its switching state changes, it outputs a corresponding low air pressure lockout signal to the measurement and control device.

[0012] Preferably, the air chamber of the GIS equipment is a busbar disconnector air chamber. When the pressure difference between the compensation air chamber and the main body air chamber exceeds a preset safety threshold, a corresponding alarm signal is output to the alarm circuit. The safety threshold includes at least the pressure safety threshold between the busbar disconnector air chamber and the compensation air chamber.

[0013] Preferably, the air chamber of the GIS equipment is the outgoing side disconnector air chamber. When the pressure difference between the compensation air chamber and the main body air chamber exceeds a preset safety threshold, a corresponding alarm signal is output to the alarm circuit. The safety threshold includes at least the pressure safety threshold between the outgoing side disconnector air chamber and the compensation air chamber.

[0014] In summary, implementing the embodiments of the present invention has the following beneficial effects: The gas density relay for GIS equipment provided by this invention is used to detect the potential danger of rapid leakage of SF6 gas pressure to "zero pressure" in the gas chamber, providing data support for jamming situations; it can detect the potential danger of rapid leakage of SF6 gas pressure to "zero pressure" in the gas chamber in advance; and it can provide early warning to remind dispatching and maintenance personnel to quickly isolate the gas chamber through remote means. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, obtaining other drawings based on these drawings without creative effort still falls within the scope of the present invention.

[0016] Figure 1 This is a schematic diagram of a gas density relay for GIS equipment according to an embodiment of the present invention.

[0017] Figure 2 This is a schematic diagram illustrating how a gas density relay used in a GIS device provides data support for handling jamming situations, as described in an embodiment of the present invention. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings.

[0019] like Figure 1 The diagram shown is a schematic representation of an embodiment of a gas density relay for GIS equipment provided by the present invention. This embodiment includes: The housing 1 contains, from top to bottom, interconnected circuit control chamber 2, compensation gas chamber 3, and main body gas chamber 4. The circuit control chamber 2 contains multiple touch switches 21 and a pressure gauge 22. The compensation gas chamber 3 contains compensation gas to ensure pressure balance between the compensation gas chamber 3 and the main body gas chamber 4. The main body gas chamber 4 is connected to the gas chamber of the GIS equipment. The compensation gas chamber 3 contains a vertically movable pressure measuring element 31, which also isolates the communication path between the circuit control chamber 2, the compensation gas chamber 3, and the main body gas chamber 4. The housing 1 also contains a pointer stop bar 5, with its top end connected to the pressure gauge 22 and its bottom end connected to the pressure measuring element 31. The pointer stop bar 5 is also connected to the touch switches 21. When the pointer stop bar 5 is at its initial point, the touch switch 21 is open; when the pointer stop bar 5 moves to a preset pressure point, the touch switch 21 is closed.

[0020] In one specific embodiment of the present invention, the pressure measuring element 31 is convex in shape, with openings at its top and bottom, and its sidewalls are made of a stretchable elastic material. The top end of the pressure measuring element 31 is fixed to the top wall of the compensation chamber 3, and its top opening covers the passage between the circuit control chamber 2 and the compensation chamber 3; the bottom end of the pressure measuring element 31 is fixed to the bottom wall of the compensation chamber 3, and its bottom opening covers the passage between the compensation chamber 3 and the main body chamber 4.

[0021] In one embodiment, the bottom end of the pointer stop bar 5 passes through the passage between the circuit control chamber 2 and the compensation gas chamber 3, and is embedded in the top opening of the pressure measuring element 31, so that it can move with the pressure measuring element 31.

[0022] In one embodiment, the touch switch 21 is equipped with a magnet and a moving contact. When the pointer stop bar 5 moves to a preset pressure point, the moving contact is attracted to a preset contact point by the magnet, thus connecting the touch switch 21. When the pointer stop bar 5 is at the initial point, the moving contact is separated from the preset contact point by the magnet, thus disconnecting the touch switch 21. When the pointer stop bar 5 approaches the set pressure, the magnet causes the contacts to quickly close due to the magnetism, thus connecting the electrical circuit. The reset force generated by the pressure sensing element 31 is greater than the magnetic attraction between the contacts, causing the contacts to quickly open and disconnecting the electrical circuit.

[0023] like Figure 2 As shown, this device is designed to address the potential danger of rapid SF6 gas pressure leakage to "zero pressure" in the gas chamber, providing data support for jamming situations. The implementation method is as follows: The trigger switch 21 is connected to the signal circuit of the monitoring and control device. When its switching state changes, it outputs a corresponding low gas pressure alarm signal to the monitoring and control device signal circuit. The trigger switch 21 is also connected to the control circuit. When its switching state changes, it outputs a corresponding low gas pressure lockout signal to the monitoring and control device signal circuit.

[0024] In one embodiment, the air chamber of the GIS equipment is a busbar disconnector air chamber. When the pressure difference between the compensation air chamber 3 and the main body air chamber 4 exceeds a preset safety threshold, a corresponding alarm signal is output to the alarm circuit. The safety threshold includes at least the pressure safety threshold between the busbar disconnector air chamber and the compensation air chamber 3. Alternatively, the air chamber of the GIS equipment can be an outgoing-side disconnector air chamber. When the pressure difference between the compensation air chamber 3 and the main body air chamber 4 exceeds a preset safety threshold, a corresponding alarm signal is output to the alarm circuit. The safety threshold includes at least the pressure safety threshold between the outgoing-side disconnector air chamber and the compensation air chamber 3.

[0025] In summary, implementing the embodiments of the present invention has the following beneficial effects: The gas density relay for GIS equipment provided by this invention is used to detect the potential danger of rapid leakage of SF6 gas pressure to "zero pressure" in the gas chamber, providing data support for jamming situations; it can detect the potential danger of rapid leakage of SF6 gas pressure to "zero pressure" in the gas chamber in advance; and it can provide early warning to remind dispatching and maintenance personnel to quickly isolate the gas chamber through remote means.

[0026] The above description discloses only preferred embodiments of the present invention and should not be construed as limiting the scope of the present invention. Therefore, equivalent variations made in accordance with the claims of the present invention are still within the scope of the present invention.

Claims

1. A gas density relay for GIS equipment, characterized in that, include: The housing includes, from top to bottom, an interconnected circuit control chamber, a compensation gas chamber, and a main body gas chamber. The circuit control chamber contains multiple touch switches and pressure gauges. The compensation gas chamber contains compensation gas to ensure pressure balance between the compensation gas chamber and the main body gas chamber. The main body gas chamber is connected to the gas chamber of the GIS equipment. The compensation chamber is equipped with a pressure measuring element that can move up and down. The pressure measuring element is also used to isolate the communication path between the circuit control chamber, the compensation chamber and the main body chamber. The housing also includes a pointer stop bar, the top of which is connected to the pressure gauge, and the bottom of which is connected to the pressure sensing element; the pointer stop bar is also connected to the touch switch. When the pointer stop bar is at the initial point, the touch switch is off; when the pointer stop bar moves to the preset pressure point, the touch switch is on.

2. The gas density relay as described in claim 1, characterized in that, The pressure measuring element is convex in shape, with openings at its top and bottom, and its sidewalls are made of a stretchable elastic material.

3. The gas density relay as described in claim 2, characterized in that, The top end of the pressure measuring element is fixed to the top wall of the compensation air chamber, and its top opening covers the passage between the circuit control chamber and the compensation air chamber; the bottom end of the pressure measuring element is fixed to the bottom wall of the compensation air chamber, and its bottom opening covers the passage between the compensation air chamber and the main body air chamber.

4. The gas density relay as described in claim 3, characterized in that, The bottom end of the pointer stop bar passes through the passage between the circuit control chamber and the compensation gas chamber and is embedded in the top opening of the pressure measuring element, so that it can move with the pressure measuring element.

5. The gas density relay as described in claim 4, characterized in that, The touch switch is equipped with a magnet and a moving contact. When the pointer stop bar moves to a preset pressure point, the moving contact is attracted to the preset contact point by the magnetic force of the magnet, thus connecting the touch switch. When the pointer stop bar is at the initial point, the moving contact is separated from the preset contact point by the magnetic force of the magnet, thus disconnecting the touch switch.

6. The gas density relay as described in claim 5, characterized in that, The trigger switch is connected to the signal circuit of the monitoring and control device. When its switch state changes, it outputs a corresponding low air pressure alarm signal to the signal circuit of the monitoring and control device.

7. The gas density relay as described in claim 6, characterized in that, The trigger switch is also connected to a control circuit. When its switching state changes, it outputs a corresponding low air pressure lockout signal to the measurement and control device.

8. The gas density relay as described in claim 7, characterized in that, The air chamber of the GIS equipment is the busbar disconnector air chamber. When the pressure difference between the compensation air chamber and the main body air chamber exceeds a preset safety threshold, a corresponding alarm signal is output to the alarm circuit. The safety threshold includes at least the pressure safety threshold between the busbar disconnector air chamber and the compensation air chamber.

9. The gas density relay as described in claim 7, characterized in that, The air chamber of the GIS equipment is the outgoing side disconnector air chamber. When the air pressure difference between the compensation air chamber and the main body air chamber exceeds a preset safety threshold, a corresponding alarm signal is output to the alarm circuit. The safety threshold includes at least the air pressure safety threshold between the outgoing side disconnector air chamber and the compensation air chamber.

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