Automatic gas heating device for sulfur hexafluoride electrical equipment

Abstract

The present invention relates to the technical field of heating of insulating gas electrical equipment, and is a gas automatic heating device for sulfur hexafluoride electrical equipment. It includes a constant heating chamber, a constant air replenishing chamber, a tail gas tank, a vacuum pump, and a compression pump. The constant heating chamber is provided with a heater and a temperature controller. A discharge pipeline is fixedly connected to the first air inlet end at the upper part of the constant heating chamber. A heating chamber vacuum pipeline is fixedly connected between the air outlet end at the lower part of the constant heating chamber and the first air inlet end of the vacuum pump. A tail gas pipeline is fixedly connected between the air outlet end of the vacuum pump and the tail gas tank. A replenishing chamber vacuum pipeline is fixedly connected between the air outlet end at the lower part of the constant air replenishing chamber and the second air inlet end of the vacuum pump. By automatically operating the processes of deflation, air replenishment, and heating of sulfur hexafluoride gas in the gas-filled electrical equipment, the present invention avoids the occurrence of low-temperature liquefaction of sulfur hexafluoride gas in the sulfur hexafluoride gas-filled electrical equipment, eliminates potential safety hazards of the equipment, and only requires regular inspections by staff, greatly reducing the workload of personnel.

Description

Technical Field

[0001] The present invention relates to the technical field of heating of insulating gas electrical equipment, and is an automatic heating device for the gas of sulfur hexafluoride electrical equipment. Background Art

[0002] In most areas in the north of China, it is relatively cold in winter. For sulfur hexafluoride electrical equipment in this area, including circuit breakers, voltage transformers, and current transformers, when the external environment temperature is low, part of the sulfur hexafluoride gas in the gas chamber liquefies, resulting in a pressure drop. The arc extinguishing ability and insulation level of sulfur hexafluoride gas decrease significantly, causing insufficient insulation performance and breaking ability of the equipment, and in severe cases, leading to alarm and locking of electrical equipment, affecting the safe operation of the power grid. At present, there are mainly two measures to solve the liquefaction of sulfur hexafluoride gas: one is an external surface heating device, and the other is to use a mixture with a lower liquefaction temperature to solve it. Although the above two measures can basically meet the requirements of metal shell type gas-filled equipment, the effect on gas-filled equipment such as porcelain column circuit breakers is poor. Summary of the Invention

[0003] The present invention provides an automatic heating device for the gas of sulfur hexafluoride electrical equipment, which overcomes the above-mentioned deficiencies of the prior art and can effectively solve the problem that part of the sulfur hexafluoride gas in the gas chamber of existing sulfur hexafluoride electrical equipment liquefies.

[0004] The technical solution of the present invention is achieved by the following measures: an automatic heating device for the gas of sulfur hexafluoride electrical equipment, including a constant heating chamber, a constant air supplement chamber, a tail gas tank, a vacuum pump, and a compression pump. The constant heating chamber is provided with a heater and a temperature controller. The first intake end at the upper part of the constant heating chamber is fixedly communicated with a discharge pipeline. A heating chamber vacuum pipeline is fixedly connected between the outlet end at the lower part of the constant heating chamber and the first intake end of the vacuum pump. A tail gas pipeline is fixedly connected between the outlet end of the vacuum pump and the tail gas tank. A air supplement chamber vacuum pipeline is fixedly connected between the outlet end at the lower part of the constant air supplement chamber and the second intake end of the vacuum pump. A communication pipeline is fixedly connected between the air supplement chamber vacuum pipeline and the heating chamber vacuum pipeline. A first compression pipeline is fixedly connected between the outlet end at the upper part of the constant heating chamber and the inlet of the compression pump. A second compression pipeline is fixedly connected between the outlet of the compression pump and the intake end at the lower part of the constant air supplement chamber. A three-way valve is fixedly installed on the discharge pipeline, and a gas supplement pipeline is fixedly connected between the lower port of the three-way valve and the outlet end at the upper part of the constant air supplement chamber.

[0005] The following is a further optimization and / or improvement of the above technical solution:

[0006] A first pressure sensor and a first temperature sensor are fixedly installed on the side of the constant heating chamber.

[0007] A second pressure sensor and a second temperature sensor are fixedly installed on the side of the constant air supplement chamber.

[0008] A flow meter, a third pressure sensor, and a third temperature sensor are fixedly installed on the exhaust gas pipeline between the intake port of the above-mentioned exhaust gas pipeline and the gas supply pipeline.

[0009] The above-mentioned sulfur hexafluoride electrical equipment gas automatic heating device further includes a controller, and the control ends of the vacuum pump and the compression pump are electrically connected to the controller.

[0010] The above-mentioned first pressure sensor, first temperature sensor, second pressure sensor, second temperature sensor, third pressure sensor, third temperature sensor, and flow meter are all electrically connected to the controller.

[0011] Safety valves are installed on the above-mentioned constant heating chamber, constant gas supply chamber, and tail gas tank.

[0012] A one-way valve is installed on the above-mentioned connecting pipeline.

[0013] The beneficial effects of the present invention are as follows: The sulfur hexafluoride electrical equipment gas automatic heating device can accurately control the intake and exhaust gas volumes according to the trend of the sulfur hexafluoride gas state changing with temperature, ensure that the pressure of the electrical equipment is within the normal range. At the same time, the gas coming out of the electrical equipment is subjected to constant temperature heating treatment and then sent back to the electrical equipment. Through a complete set of cyclic processing, the temperature of the sulfur hexafluoride gas in the electrical equipment in a low-temperature environment is increased, preventing its low-temperature liquefaction. In addition, the tail gas tank provided in the present invention can treat the exhausted tail gas. Through the provided safety valve, the pressure of the tank body is prevented from being too high, improving the safety of the present invention, and making the present invention have good social and economic benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Attached Figure 1 is a schematic process flow diagram of the present invention.

[0015] The codes in the drawings are respectively: 1 is a constant heating chamber, 2 is a constant gas supply chamber, 3 is a tail gas tank, 4 is a vacuum pump, 5 is a compression pump, 6 is a heater, 7 is a temperature controller, 8 is an exhaust gas pipeline, 9 is a heating chamber vacuum pipeline, 10 is a tail gas pipeline, 11 is a gas supply chamber vacuum pipeline, 12 is a connecting pipeline, 13 is a first compression pipeline, 14 is a second compression pipeline, 15 is a three-way valve, 16 is a gas supply pipeline, 17 is a first pressure sensor, 18 is a first temperature sensor, 19 is a second pressure sensor, 20 is a second temperature sensor, 21 is a flow meter, 22 is a third pressure sensor, 23 is a third temperature sensor, 24 is a controller, 25 is a safety valve, 26 is a one-way valve. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0016] The present invention is not limited by the following embodiments, and specific implementation manners can be determined according to the technical solutions of the present invention and actual situations. In the present invention, unless otherwise specified, the devices and apparatuses used are the existing well-known and commonly used devices and apparatuses in the art. In the present invention, for the convenience of description, the description of the relative positional relationship of each component is based on the layout mode of the Figure 1 layout in the attached drawings, such as the positional relationships of front, back, up, down, left, right, etc. are determined according to the layout direction of the Figure 1 attached drawings.

[0017] The present invention will be further described below in conjunction with embodiments and the accompanying drawings:

[0018] Embodiment 1: As shown in the Figure 1 attached drawings, the sulfur hexafluoride electrical equipment gas automatic heating device includes a constant heating chamber 1, a constant air supplement chamber 2, an exhaust gas tank 3, a vacuum pump 4, and a compression pump 5. The constant heating chamber 1 is provided with a heater 6 and a temperature controller 7. A discharge pipeline 8 is fixedly connected to the first intake end at the upper part of the constant heating chamber 1. A heating chamber vacuum pipeline 9 is fixedly connected between the outlet end at the lower part of the constant heating chamber 1 and the first intake end of the vacuum pump 4. A tail gas pipeline 10 is fixedly connected between the outlet end of the vacuum pump 4 and the exhaust gas tank 3. An air supplement chamber vacuum pipeline 11 is fixedly connected between the outlet end at the lower part of the constant air supplement chamber 2 and the second intake end of the vacuum pump 4. A connecting pipeline 12 is fixedly connected between the air supplement chamber vacuum pipeline 11 and the heating chamber vacuum pipeline 9. A first compression pipeline 13 is fixedly connected between the outlet end at the upper part of the constant heating chamber 1 and the inlet of the compression pump 5. A second compression pipeline 14 is fixedly connected between the outlet of the compression pump 5 and the inlet end at the lower part of the constant air supplement chamber 2. A three-way valve 15 is fixedly installed on the discharge pipeline 8. A gas supplement pipeline 16 is fixedly connected between the lower port of the three-way valve 15 and the outlet end at the upper part of the constant air supplement chamber 2.

[0019] According to actual needs, the above sulfur hexafluoride electrical equipment gas automatic heating device can be further optimized and / or improved:

[0020] Embodiment 2: The difference from Embodiment 1 is that: as shown in the Figure 1 attached drawings, a first pressure sensor 17 and a first temperature sensor 18 are fixedly installed on the side of the constant heating chamber 1.

[0021] Embodiment 3: The difference from Embodiments 1 to 2 is that: as shown in the Figure 1 attached drawings, a second pressure sensor 19 and a second temperature sensor 20 are fixedly installed on the side of the constant air supplement chamber 2.

[0022] Embodiment 4: The difference from Embodiments 1 to 3 is that: as shown in the Figure 1As shown, a flow meter 21, a third pressure sensor 22, and a third temperature sensor 23 are fixedly installed on the vent gas pipeline 8 between the intake port of the vent gas pipeline 8 and the make-up gas pipeline 16.

[0023] Embodiment 5: The difference from Embodiments 1 to 4 is that as shown in the appendix Figure 1 As shown, the sulfur hexafluoride electrical equipment gas automatic heating device further includes a controller 24, and the control ends of the vacuum pump 4 and the compression pump 5 are electrically connected to the controller 24.

[0024] Embodiment 6: The difference from Embodiments 1 to 4 is that as shown in the appendix Figure 1 As shown, the first pressure sensor 17, the first temperature sensor 18, the second pressure sensor 19, the second temperature sensor 20, the third pressure sensor 22, the third temperature sensor 23, and the flow meter 21 are all electrically connected to the controller 24.

[0025] Embodiment 7: The difference from Embodiments 1 to 6 is that as shown in the appendix Figure 1 As shown, safety valves 25 are installed on the constant heating chamber 1, the constant make-up gas chamber 2, and the tail gas tank 3. The safety valve 25 can prevent damage to the tail gas tank 3, the constant heating chamber 1, and the constant make-up gas chamber 2 caused by excessive pressure.

[0026] Embodiment 8: The difference from Embodiments 1 to 7 is that as shown in the appendix Figure 1 As shown, a one-way valve 26 is installed on the connecting pipeline 12.

[0027] As needed, electromagnetic valves that can enable the normal operation of the sulfur hexafluoride electrical equipment gas automatic heating device are fixedly installed on each pipeline. During use, the opening and closing of each electromagnetic valve can be controlled by the controller 24.

[0028] In the present invention, the configured constant heating chamber 1 is equipped with a first temperature sensor 18, a first pressure sensor 17, a heater 6, and a temperature controller 7, and can accurately control the intake air volume. Through the pressure sensor configured in the chamber, quantitative heating of the gas can be achieved. In addition, a heating coil and a temperature control coil are embedded in the housing of the constant heating chamber 1 or fixedly installed at the inner wall of the heating housing. The constant make-up gas chamber 2 can accurately control the make-up gas volume. In actual use of the present invention, the controller 24 can be configured with a display screen and control software. The control software can edit the operation process. By collecting data from the flow sensors, pressure sensors, and temperature sensors on the constant heating chamber 1, the constant make-up gas chamber 2, and the pipelines, the start and stop of each valve and pump can be controlled to accurately control each step and realize the automatic operation of the process. The tail gas tank 3 can store sulfur hexafluoride gas for recovery. During use, the vacuum pump 4 can also cooperate with the electromagnetic valves on the device pipelines to flush each pipeline and chamber of the device, ensuring the purity of the sulfur hexafluoride gas inside the device. The sulfur hexafluoride gas after flushing is stored in the tail gas tank 3, avoiding pollution to the atmosphere.

[0029] Before the first use of the automatic gas heating device for sulfur hexafluoride electrical equipment, first use the vacuum pump 4 to evacuate the constant gas replenishing chamber 2, and then fill the qualified sulfur hexafluoride gas in the external sulfur hexafluoride gas cylinder into the constant gas replenishing chamber 2 through the gas discharge pipeline 8 and the gas replenishing pipeline, and accurately control the gas intake through the temperature sensor and the pressure sensor.

[0030] Connect the gas discharge pipeline 8 of the automatic gas heating device for sulfur hexafluoride electrical equipment to the gas chamber of the inflatable electrical equipment that needs to be heated. The entire operation process during use is divided into gas discharge, gas replenishment, and heating. During gas discharge, use the vacuum pump 4 to extract the pressure in the constant heating chamber 1 to the set value (the extracted gas enters the tail gas tank 3), and the three-way valve 15 switches to the direction of the constant heating chamber 1. The sulfur hexafluoride in the inflatable electrical equipment gas chamber enters the constant heating chamber 1 cavity through the pressure difference. After the pressure in the constant heating chamber 1 reaches the set value, the three-way valve 15 switches to the direction of the constant gas replenishing chamber 2, and the gas replenishment operation starts. During gas replenishment, the sulfur hexafluoride gas in the constant gas replenishing chamber 2 is transported to the inflatable electrical equipment gas chamber through the compression pump 5. After the pressure in the constant gas replenishing chamber 2 reaches the set value, the gas replenishment ends. After the gas replenishment ends, the heating process starts. The constant heating chamber 1 starts to heat. When the gas is heated to the set temperature, it starts to maintain a constant temperature. After maintaining a constant temperature for 10 minutes, the sulfur hexafluoride gas in the constant heating chamber 1 enters the constant gas replenishing chamber 2 through the connecting pipeline 12. When the pressure in the constant heating chamber 1 is slightly higher than that in the constant gas replenishing chamber 2, start the compression pump 5 to transport the remaining gas in the constant heating chamber 1 to the constant gas replenishing chamber 2. After the pressure in the constant heating chamber 1 reaches the set value, stop the operation of the compression pump 5, close the valve, and this process ends. The entire process is cyclically repeated according to the above steps of gas discharge, gas replenishment, and heating. Stop the operation of the device after the pressure and temperature on the device and the gas discharge pipeline 8 reach the set values.

[0031] In summary, the present invention provides an automatic gas heating device for sulfur hexafluoride electrical equipment. On the premise of ensuring the safe operation of the equipment, by transporting the sulfur hexafluoride gas in the inflatable electrical equipment to the constant heating chamber for heating, and then filling the sulfur hexafluoride gas into the inflatable electrical equipment from the constant gas replenishing chamber, and so on in a cycle, it realizes the automatic operation of the gas discharge, gas replenishment, and heating processes, avoids the occurrence of low-temperature liquefaction phenomenon of sulfur hexafluoride gas-filled electrical equipment, eliminates the potential safety hazards of the equipment, and the staff only needs to conduct regular inspections, greatly reducing the workload of personnel.

[0032] The above technical features constitute the embodiments of the present invention, which have strong adaptability and implementation effects. Non-essential technical features can be increased or decreased according to actual needs to meet the requirements of different situations.

Claims

1. An automatic gas heating device for sulfur hexafluoride electrical equipment, characterized in that It includes a constant-heating chamber, a constant-air-supplementing chamber, an exhaust gas tank, a vacuum pump, and a compression pump. The constant-heating chamber is provided with a heater and a temperature controller. The first intake end at the upper part of the constant-heating chamber is fixedly communicated with a discharge pipeline. A heating-chamber vacuum pipeline is fixedly communicated between the outlet end at the lower part of the constant-heating chamber and the first intake end of the vacuum pump. A tail gas pipeline is fixedly communicated between the outlet end of the vacuum pump and the exhaust gas tank. A gas-supplementing-chamber vacuum pipeline is fixedly communicated between the outlet end at the lower part of the constant-air-supplementing chamber and the second intake end of the vacuum pump. A connecting pipeline is fixedly communicated between the gas-supplementing-chamber vacuum pipeline and the heating-chamber vacuum pipeline. A first compression pipeline is fixedly communicated between the outlet end at the upper part of the constant-heating chamber and the inlet of the compression pump. A second compression pipeline is fixedly communicated between the outlet of the compression pump and the intake end at the lower part of the constant-air-supplementing chamber. A three-way valve is fixedly installed on the discharge pipeline. A gas-supplementing pipeline is fixedly communicated between the lower port of the three-way valve and the outlet end at the upper part of the constant-air-supplementing chamber; It further includes a controller. The control ends of the vacuum pump and the compression pump are electrically connected to the controller. A first pressure sensor is fixedly installed on the side of the constant-heating chamber. A second pressure sensor is fixedly installed on the side of the constant-air-supplementing chamber. A third pressure sensor is fixedly installed on the discharge pipeline between the intake port of the discharge pipeline and the gas-supplementing pipeline. The first pressure sensor, the second pressure sensor, and the third pressure sensor are all electrically connected to the controller.

2. The automatic gas heating device for sulfur hexafluoride electrical equipment according to claim 1, characterized in that A first temperature sensor is fixedly installed on the side of the constant-heating chamber.

3. The sulfur hexafluoride electrical equipment gas automatic heating device according to claim 2, characterized in that A second temperature sensor is fixedly installed on the side of the constant-air-supplementing chamber.

4. The automatic gas heating device for sulfur hexafluoride electrical equipment according to claim 3, characterized in that A flowmeter and a third temperature sensor are fixedly installed on the discharge pipeline between the intake port of the discharge pipeline and the gas-supplementing pipeline.

5. The automatic gas heating device for sulfur hexafluoride electrical equipment according to claim 4, characterized in that The first temperature sensor, the second temperature sensor, the third temperature sensor, and the flowmeter are all electrically connected to the controller.

6. The automatic gas heating device for sulfur hexafluoride electrical equipment according to any one of claims 1 to 5, characterized in that Safety valves are installed on the constant-heating chamber, the constant-air-supplementing chamber, and the exhaust gas tank.

7. The automatic gas heating device for sulfur hexafluoride electrical equipment according to claim 6, characterized in that A one-way valve is installed on the connecting pipeline.

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