SF6 automatic alarm cut-off device for high-voltage equipment

Abstract

The application discloses a SF6 automatic alarm cut-off device for high-voltage equipment and belongs to the technical field of power maintenance auxiliary devices. The SF6 automatic alarm cut-off device comprises a gas pipe, one end of the gas pipe is connected to a main gas cylinder for sending SF6, a pressure reducing valve is arranged in the middle of the gas pipe, a functional connector is arranged at the other end of the gas pipe, the functional connector can be connected to an auxiliary gas cylinder to be supplied with gas and a gas inlet of high-voltage equipment to be supplied with gas respectively, an automatic overpressure alarm cut-off device and a pressure gauge for measuring the pressure of SF6 gas in the side pipeline are further arranged on the gas pipe, and the SF6 automatic alarm cut-off device solves the problem that there is no device with an alarm cut-off function when SF6 is supplied to high-voltage equipment.

Description

Technical Field

[0001] This invention relates to the field of power maintenance auxiliary devices, specifically to an automatic alarm and shut-off device for SF6 gas replenishment in high-voltage equipment. Background Technology

[0002] When replenishing SF6 insulated electrical equipment, workers must constantly monitor the density relay of the gas chamber in the high-voltage equipment to prevent overfilling, which could loosen the sealing rings, detach the connecting pipes, and cause a large amount of gas leakage. Currently, however, the system relies solely on a supervisor constantly monitoring the pressure gauge to determine if overfilling has occurred. Furthermore, existing gas replenishment devices lack automatic alarm functions and overfill cutoff mechanisms. This means that negligence by workers could lead to overfilling, causing a large amount of gas leakage, damaging the electrical equipment insulation, triggering a busbar trip, a widespread power outage, and endangering the lives of those replenishing the gas. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide an automatic alarm and shut-off device for SF6 replenishment of high-voltage equipment, so as to solve the problem that the current devices for SF6 replenishment of high-voltage equipment lack alarm and shut-off functions.

[0004] To address the above problems, the present invention provides the following technical solution:

[0005] An automatic alarm and shut-off device for SF6 gas replenishment in high-pressure equipment is provided. It includes a gas pipe; one end of the gas pipe is connected to the main gas cylinder supplying SF6; a pressure reducing valve is provided in the middle of the gas pipe; a functional connector is provided at the other end of the gas pipe; the functional connector can be connected to the auxiliary gas cylinder to be supplied and the gas inlet of the high-pressure equipment to be replenished; an automatic overpressure alarm and shut-off device and a pressure gauge for the SF6 gas pressure in the side pipeline are also installed on the gas pipe.

[0006] Preferably, a manual shut-off valve is also installed on the air pipe; the pressure reducing valve, the manual shut-off valve, the automatic overpressure alarm shut-off device, and the pressure gauge are arranged sequentially from the side of the air pipe closest to the main gas cylinder.

[0007] Preferably, the functional connector includes a first connector located at the tail end of the trachea; the shape and size of the first connector are adapted to the mouth of the auxiliary gas cylinder; a retractable outer trachea is sleeved on the outside of the first connector; a second connector is installed at the other end of the outer trachea; the shape and size of the second connector are matched to the air inlet of the high-pressure equipment; the inner diameter of the second connector is larger than the outer diameter of the first connector.

[0008] Furthermore, the tail end of the outer trachea is sealed to the side of the first connector near the trachea, and when the outer trachea is in its natural state, the second connector completely encloses the first connector inside.

[0009] Preferably, the automatic overpressure alarm shut-off device includes a pressure sensor and an electrically controlled one-way valve disposed inside the trachea; both the pressure sensor and the electrically controlled one-way valve are connected to a microprocessor; the microprocessor is mounted on the outside of the trachea and is powered by a built-in button battery; an alarm is also integrated into the microprocessor.

[0010] Furthermore, the automatic overpressure alarm shut-off device also includes a boss located on the outside of the trachea; a microprocessor is placed in the boss, and a rotatable cap is provided on the top of the boss; the lower part of the cap is a rotating shaft structure, and the rotating shaft structure is connected to the input end of the digital-to-analog converter; the output end of the digital-to-analog converter is connected to an input interface of the microprocessor.

[0011] Furthermore, a pressure conversion indicator corresponding to different rotation angles of the twist cap is provided on the top of the boss; and an arrow pointing to these indicators is provided on the twist cap.

[0012] Preferably, the microprocessor is a single-chip microcomputer-based integrated circuit; the digital-to-analog converter is an axial-angular position digital-to-analog converter.

[0013] This invention also discloses a method for using an automatic alarm and shut-off device for SF6 gas replenishment in high-voltage equipment, which includes the following steps:

[0014] S1. Set the parameters of the pressure reducing valve according to the input air pressure required by the equipment to be replenished, and keep the pressure reducing valve port closed;

[0015] S2. Connect one end of the air tube to the main gas cylinder. Select either the first or second connector on the side with the functional connector, depending on the type of equipment to be replenished. If it is necessary to replenish high-pressure equipment, directly connect the second connector to the air inlet of the high-pressure equipment. If it is necessary to replenish the auxiliary gas cylinder, the second connector needs to be removed from the first connector and then the first connector needs to be disconnected and connected to the mouth of the auxiliary gas cylinder.

[0016] S3. Rotate the toggle cap until the arrow on the toggle cap points to the pressure mark corresponding to the boss; then turn on the built-in power of the automatic overpressure alarm shut-off device and open the pressure reducing valve to replenish the air;

[0017] S4. During the gas replenishment process, if the pressure value input to the microprocessor by the pressure sensor reaches the alarm pressure written inside the microprocessor, the microprocessor controls the alarm to sound an alarm bell; if the pressure value input to the microprocessor by the pressure sensor reaches the real-time cutoff pressure written to the microprocessor by the digital-to-analog converter from the position of the torsion cap, the transmission of SF6 gas in the pipeline is quickly cut off within 0.5 seconds; during the gas replenishment process, if the operator finds that the pressure gauge reading is abnormal, the pressure reducing valve is improperly set, the pressure reducing valve is damaged, or excessive gas replenishment is caused by human error, the gas pipeline can be closed by manually shutting off the valve.

[0018] S5. After completing the gas replenishment, disconnect both sides of the gas pipe and reset all equipment to complete the entire gas replenishment operation.

[0019] The beneficial effects of this invention are reflected in the following aspects:

[0020] Economic benefits: By adopting the "intelligent SF6 gas replenishment device under the background of intrinsically safe power grid", the process of replenishing gas-insulated electrical equipment can be simplified, the preparation time of test work can be reduced, and injuries to people and equipment can be prevented. It can also avoid large-scale gas leakage in the gas chamber, which could cause busbar tripping and large-scale power outages, saving the company 200,000 RMB per year.

[0021] Social benefits: This technology allows only two people to complete the entire gas replenishment process, making it lightweight and convenient, freeing up manpower, and improving work standardization. This innovation optimizes human-machine efficiency, effectively simplifying complex processes and enhancing the social image of power supply companies.

[0022] Safety benefits: This device can prevent negligence by staff, over-inflation, and large-scale air leakage in the gas chamber, which could damage the insulation of electrical equipment, cause busbar tripping and large-scale power outages, and endanger the lives of gas replenishment personnel. It ensures the reliable operation of the power grid and guarantees the safety of gas replenishment personnel. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the structure of the inventive device in this embodiment;

[0024] Figure 2 This is a schematic diagram of the functional connector in this embodiment;

[0025] Figure 3 This is a schematic diagram of the automatic overvoltage alarm shut-off device in this embodiment;

[0026] Explanation of reference numerals in the attached drawings: 1. Automatic overpressure alarm shut-off device; 1A. Pressure sensor; 1B. Electrically controlled one-way valve; 1C. Microprocessor; 1D. Alarm; 1E. Boss; 1F. Torque cap; 1G. Digital-to-analog converter; 2. Pressure gauge; 3. Air tube; 4. Manual shut-off valve; 5. Main gas cylinder; 6. Pressure reducing valve; 7. Functional connector; 7A. First connector; 7B. Outer air tube; 7C. Second connector. Detailed Implementation

[0027] The present invention will be further described below with reference to the accompanying drawings and specific embodiments:

[0028] Example:

[0029] Reference Figure 1This embodiment provides an automatic alarm and shut-off device for SF6 gas replenishment in high-pressure equipment. It includes a gas pipe 3; one end of the gas pipe 3 is connected to the main SF6 cylinder 5; a pressure reducing valve 6 is installed in the middle of the gas pipe 3; a functional connector 7 is installed at the other end of the gas pipe 3; the functional connector 7 can be connected to the auxiliary gas cylinder to be supplied and the air inlet of the high-pressure equipment to be replenished; an automatic overpressure alarm and shut-off device 1 and a pressure gauge 2 for the SF6 gas pressure in the side pipeline are also installed on the gas pipe 3. In this embodiment, several pipe clamps are provided inside the housing 1 for detachably installing the gas pipe 2 inside.

[0030] A manual shut-off valve 4 is also installed on the gas pipe 3; the pressure reducing valve 6, the manual shut-off valve 4, the automatic overpressure alarm shut-off device 1 and the pressure gauge 2 are arranged in sequence from the side of the gas pipe 3 closest to the main gas cylinder.

[0031] The functional connector 7 includes a first connector 7A located at the tail end of the air tube 3; the shape and size of the first connector 7A are adapted to the mouth of the auxiliary gas cylinder; a retractable outer air tube 7B is sleeved on the outside of the first connector 7A; a second connector 7C is installed at the other end of the outer air tube 7B; the shape and size of the second connector 7C are matched with the air inlet of the high-pressure equipment; the inner diameter of the second connector 7C is larger than the outer diameter of the first connector 7C.

[0032] The tail of the outer trachea 7B is sealed to the side of the first connector 7A near the trachea 3, and when the outer trachea 7B is in its natural state, the second connector 7C completely covers the first connector 7A inside.

[0033] The automatic overpressure alarm shut-off device 1 includes a pressure sensor 1A and an electrically controlled one-way valve 1B disposed inside the trachea 3; both the pressure sensor 1A and the electrically controlled one-way valve 1B are connected to a microprocessor 1C; the microprocessor 1C is mounted on the outside of the trachea 1 and is powered by a built-in button battery; an alarm 1D is also integrated on the microprocessor 1C. In this embodiment, the alarm 1D includes an indicator light and a buzzer.

[0034] The automatic overpressure alarm shut-off device 1 also includes a boss 1E disposed on the outside of the trachea 1; the microprocessor 1C is placed in the boss 1E, and a rotatable cap 1F is disposed on the top of the boss 1E; the lower part of the cap 1F is a rotating shaft structure, and the rotating shaft structure is connected to the input terminal of the digital-to-analog converter 1G; the output terminal of the digital-to-analog converter 1G is connected to an input interface of the microprocessor 1C.

[0035] A pressure conversion indicator corresponding to different rotation angles of the twist cap 1F is provided on the top of the boss 1E; and an arrow pointing to these indicators is provided on the twist cap 1F.

[0036] The microprocessor 1C is a microcontroller-based integrated circuit; the digital-to-analog converter 1G is an axial angular position digital-to-analog converter.

[0037] This invention also discloses a method for using an automatic alarm and shut-off device for SF6 gas replenishment in high-voltage equipment, which includes the following steps:

[0038] S1. Set the parameters of pressure reducing valve 6 according to the input air pressure required by the equipment to be replenished, and keep the valve port of pressure reducing valve closed.

[0039] S2. Connect one end of the air tube to the main gas cylinder. Select either the first connector 7A or the second connector 7B on the side with the functional connector 7, depending on the type of equipment to be replenished. If it is necessary to replenish high-pressure equipment, directly connect the second connector 7B to the air inlet of the high-pressure equipment. If it is necessary to replenish the auxiliary gas cylinder, the second connector 7B needs to be removed from the first connector 7A and then the first connector 7A needs to be connected to the mouth of the auxiliary gas cylinder.

[0040] S3. Rotate the toggle cap 1F so that the arrow on the toggle cap 1F points to the corresponding pressure mark on the boss 1E; then turn on the built-in power of the automatic overpressure alarm shut-off device 1 and open the valve of the pressure reducing valve to replenish the air.

[0041] S4. During the gas replenishment process, if the pressure value input to the microprocessor 1C by the pressure sensor 1A reaches the alarm pressure written inside the microprocessor 1C, the microprocessor 1C controls the alarm 1D to sound an alarm. If the pressure value input to the microprocessor 1C by the pressure sensor 1A reaches the real-time cutoff pressure written to the microprocessor 1C by the digital-to-analog converter 1G from the position of the torsion cap 1F, the transmission of SF6 gas in the pipeline is quickly cut off within 0.5s. During the gas replenishment process, if the operator finds that the pressure gauge reading is abnormal, the pressure reducing valve is improperly set, the pressure reducing valve is damaged, or excessive gas replenishment is caused by human error, the operator can manually shut off the gas pipe 3 by using the shut-off valve 4.

[0042] S5. After completing the gas replenishment, disconnect both sides of the gas pipe and reset all equipment to complete the entire gas replenishment operation.

Claims

1. An automatic alarm and shut-off device for SF6 gas replenishment in high-pressure equipment, comprising a gas pipe (3); one end of the gas pipe (3) is connected to a main gas cylinder (5) supplying SF6; a pressure reducing valve (6) is provided in the middle of the gas pipe (3); characterized in that: A functional connector (7) is provided at the other end of the trachea (3); the functional connector (7) can be connected to the auxiliary gas cylinder to be supplied with gas and the air inlet of the high-pressure equipment to be replenished with gas respectively; an automatic overpressure alarm shut-off device (1) and a pressure gauge (2) for measuring the SF6 gas pressure in the pipeline are also installed on the trachea (3); the functional connector (7) includes a first connector (7A) provided at the tail end of the trachea (3); the shape and size of the first connector (7A) are adapted to the mouth of the auxiliary gas cylinder; a retractable outer trachea (7B) is sleeved on the outside of the first connector (7A); a second connector (7C) is installed at the other end of the outer trachea (7B); the shape and size of the second connector (7C) are matched with the air inlet of the high-pressure equipment; the inner diameter of the second connector (7C) is larger than the outer diameter of the first connector (7A); the tail of the outer trachea (7B) is sealed to the side of the first connector (7A) near the trachea (3), and when the outer trachea (7B) is... In its natural state, the second connector (7C) completely encloses the first connector (7A); the automatic overpressure alarm shut-off device (1) includes a pressure sensor (1A) and an electrically controlled check valve (1B) installed inside the trachea (3); both the pressure sensor (1A) and the electrically controlled check valve (1B) are connected to the microprocessor (1C); the microprocessor (1C) is installed on the outside of the trachea (3) and is powered by a built-in button battery; an alarm (1D) is also integrated on the microprocessor (1C); the automatic overpressure alarm shut-off device (1) also includes a boss (1E) installed on the outside of the trachea (3); the microprocessor (1C) is placed in the boss (1E), and a rotatable cap (1F) is provided on the top of the boss (1E); the lower part of the cap (1F) is a rotating shaft structure, and the rotating shaft structure is connected to the input end of the digital-to-analog converter (1G); the output end of the digital-to-analog converter (1G) is connected to an input interface of the microprocessor (1C).

2. The SF6 gas replenishment automatic alarm and shut-off device for high-voltage equipment according to claim 1, characterized in that: A manual shut-off valve (4) is also installed on the gas pipe (3); the pressure reducing valve (6), the manual shut-off valve (4), the automatic overpressure alarm shut-off device (1) and the pressure gauge (2) are arranged in sequence from the side of the gas pipe (3) closest to the main gas cylinder.

3. The SF6 gas replenishment automatic alarm and shut-off device for high-voltage equipment according to claim 1, characterized in that: The top of the boss (1E) is provided with a conversion pressure mark corresponding to different rotation angles of the twist cap (1F); and the twist cap (1F) is provided with arrows for pointing to these marks.

4. The SF6 gas replenishment automatic alarm and shut-off device for high-voltage equipment according to claim 1, characterized in that: The microprocessor (IC) is a single-chip microcomputer-based integrated circuit; the digital-to-analog converter (ICG) is an axial-angle position digital-to-analog converter.

5. The method of using an automatic alarm and shut-off device for SF6 gas replenishment in high-voltage equipment according to any one of claims 1 to 4, characterized in that: Includes the following steps: S1. Set the parameters of the pressure reducing valve (6) according to the input air pressure required by the equipment to be replenished, and keep the valve port of the pressure reducing valve closed. S2. Connect one end of the air tube to the main gas cylinder. Select the first connector (7A) or the second connector (7C) on the side with the functional connector (7) according to the type of equipment to be replenished. If it is necessary to replenish the high-pressure equipment, directly connect the second connector (7C) to the air inlet of the high-pressure equipment. If it is necessary to replenish the auxiliary gas cylinder, the second connector (7C) needs to be removed from the first connector (7A) and then the first connector is connected to the mouth of the auxiliary gas cylinder. S3. Rotate the toggle cap (1F) so that the arrow on the toggle cap (1F) points to the corresponding pressure mark on the boss (1E); then turn on the built-in power supply of the automatic overpressure alarm shut-off device (1) and open the valve of the pressure reducing valve to replenish air; S4. During the gas replenishment process, if the pressure value input from the pressure sensor (1A) to the microprocessor (1C) reaches the alarm pressure written inside the microprocessor (1C), the microprocessor (1C) controls the alarm (1D) to sound an alarm bell; if the pressure value input from the pressure sensor (1A) to the microprocessor (1C) reaches the real-time cutoff pressure written to the microprocessor (1C) by the digital-to-analog converter (1G) through the rotation position of the torsion cap (1F), the transmission of SF6 gas in the pipeline is quickly cut off within 0.5s; during the gas replenishment process, if the operator finds that the pressure gauge reading is abnormal or the pressure setting of the pressure reducing valve is improper, the pressure reducing valve is damaged, or excessive gas replenishment is caused by human error, the gas pipe (3) is closed by manually shutting off the valve (4); S5. After completing the gas replenishment, disconnect both sides of the gas pipe and reset all equipment to complete the entire gas replenishment operation.

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