Automatic vacuum degassing and dewatering device and method for transformer oil

Abstract

The application discloses a transformer oil automatic vacuum degassing and dewatering device, which comprises a main box body, a horizontal plate is arranged on the main box body, a magnetic stirrer is arranged on the horizontal plate, a glass mouth filter bottle is placed on the magnetic stirrer, a temperature sensor is inserted into the glass mouth filter bottle, a rotary vane vacuum pump and a buffer tank are arranged in the main box body, the rotary vane vacuum pump is connected with the buffer tank through a first KF stainless steel vacuum bellows, a digital Pirani vacuum pressure sensor is arranged on the top of the buffer tank, a vacuum clamp tower joint is connected with the upper portion of the buffer tank through a second KF stainless steel bellows vacuum pipe, and the glass mouth filter bottle is connected with the vacuum clamp tower joint through a vacuum hose. The application further discloses a transformer oil automatic vacuum degassing and dewatering method. The device can perform vacuum degassing and dewatering treatment on transformer oil, can reduce the water content of the transformer oil to below 10 mg / kg, reduce the gas content to below 0.5%, and improve work efficiency and control precision.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of transformer oil processing, and particularly relates to a transformer oil automatic vacuum degassing and dewatering device and a transformer oil automatic vacuum degassing and dewatering method. BACKGROUND

[0002] Transformer oil mainly plays the roles of insulation, cooling and information carrier in electrical equipment such as transformers. The untreated transformer oil can absorb and dissolve air and moisture in the environment, thereby affecting the insulation performance such as breakdown voltage. The gas content is about 10%, the water content is 20-50 mg / kg, and the transformer oil also contains H2, CH4 and C2H2 and other gases affecting the judgment of transformer failure in the power industry. Therefore, the power industry needs to strictly perform vacuum degassing and dewatering treatment on the transformer oil before the transformer oil is injected into electrical equipment such as transformers to meet the insulation performance requirements. For example, the water content of the transformer oil injected into a 500kV transformer should be not more than 10 mg / kg, the gas content should be not more than 1%, and the breakdown voltage should be not less than 65kV.

[0003] In order to evaluate the insulation performance of transformer oil, the transformer oil also needs to be subjected to vacuum degassing and dewatering treatment in the laboratory. At present, the transformer oil is generally placed in a vacuum filter bottle, placed on a magnetic stirrer, and then connected to a vacuum pump. The transformer oil is heated and stirred to perform degassing and dewatering under vacuum conditions. Since the vacuum degree needs to be manually controlled, the stirring speed also needs to be controlled to prevent the oil from boiling suddenly when the initial gas content and water content are high. The vacuum degree and stirring speed need to be adjusted at all times. The vacuum degree fluctuates greatly, and the test precision and efficiency are low. SUMMARY

[0004] The purpose of the present application is to provide a transformer oil automatic vacuum degassing and dewatering device, which solves the problems of low vacuum degassing and dewatering efficiency and large vacuum degree fluctuation in the prior art.

[0005] Another purpose of the present application is to provide a transformer oil automatic vacuum degassing and dewatering method.

[0006] The technical scheme adopted by the present application is as follows: a transformer oil automatic vacuum degassing and dewatering device, comprising a main machine box body, a horizontal plate is arranged on the upper part of the main machine box body, a magnetic stirrer is arranged on the horizontal plate, a glass upper nozzle filter bottle is placed on the magnetic stirrer, a temperature sensor is inserted into the glass upper nozzle filter bottle, a rotary vane vacuum pump and a buffer tank are arranged in the bottom of the main machine box body, the rotary vane vacuum pump is connected to the upper part of the buffer tank through a first KF stainless steel vacuum bellows, a digital Pirani vacuum pressure sensor is arranged on the top of the buffer tank, the upper part of the buffer tank is connected to a vacuum clamp tower joint through a second KF stainless steel bellows vacuum pipe, and the glass upper nozzle filter bottle is connected to the vacuum clamp tower joint through a vacuum hose; a vacuum ball valve is further arranged on the second KF stainless steel bellows vacuum pipe; and a venting ball valve is connected to the bottom of the buffer tank through a stainless steel pipe.

[0007] The application also has the characteristics that,

[0008] The bottle mouth of the glass mouth filter bottle is sealed by a rubber plug, the temperature sensor is inserted into the glass mouth filter bottle through the rubber plug, and the temperature sensor is inserted into the glass mouth filter bottle to 1 / 3 of the oil surface; and the bottom of the main box body is provided with box body moving universal wheels.

[0009] An oil mist filter is installed on the exhaust hole of the rotary vane vacuum pump.

[0010] The middle part of the buffer tank is connected with a gas mass flow controller through a pipeline; the digital Pirani vacuum pressure sensor is connected with the top of the buffer tank through a vacuum clamp; and the side of the main box body is provided with a total power air switch and a touch liquid crystal display screen.

[0011] The PLC controller, the digital Pirani vacuum pressure sensor, the temperature sensor, the gas mass flow controller, the rotary vane vacuum pump, the magnetic stirrer and the touch liquid crystal display screen are connected with the PLC controller.

[0012] Another technical solution adopted by the application is a transformer oil automatic vacuum degassing and dehydration method, which is implemented according to the following steps:

[0013] Step S1: transformer oil to be treated is added into a glass mouth filter bottle, a rubber plug is added to the bottle mouth, a temperature sensor is immersed into the oil to 1 / 3, a vacuum hose is connected to the glass mouth filter bottle, and then the magnetic stirrer is placed stably;

[0014] Step S2: the emptying ball valve is closed, the vacuum ball valve is opened, the magnetic stirrer and the rotary vane vacuum pump are started, and four-stage vacuum degassing and dehydration are performed;

[0015] When the four-stage vacuum degassing and dehydration are performed, in the first stage, the stirring temperature is room temperature, the stirring speed is 150-200 rpm, the stirring time is 25-30 minutes, and the vacuum degree is 1000-1500 Pa; in the second stage, the stirring temperature is 45-50 DEG C, the stirring speed is 200-300 rpm, the stirring time is 25-30 minutes, and the vacuum degree is 500-600 Pa; in the third stage, the stirring temperature is 45-50 DEG C, the stirring speed is 400-500 rpm, the stirring time is 25-30 minutes, and the vacuum degree is 100-150 Pa; and in the fourth stage, the stirring temperature is 45-50 DEG C, the stirring speed is 500-600 rpm, the stirring time is 60 minutes, and the vacuum degree is 50-60 Pa.

[0016] Step S3: the vacuum ball valve is closed, the vacuum hose is pulled out, after the normal pressure is restored, the gas content and the water content in the transformer oil to be treated are measured, if the requirements are not met, step S2 is continuously performed until the requirements are met, and the transformer oil vacuum degassing and dehydration test is completed.

[0017] The beneficial effects of this invention are that the device can perform vacuum degassing and dehydration treatment of transformer oil, which can reduce the water content of transformer oil to below 10mg / kg and the gas content to below 0.5%, thereby improving work efficiency and control accuracy, saving labor, and providing theoretical support for vacuum degassing process conditions in industrial settings. Attached Figure Description

[0018] Figure 1 This is a schematic diagram (I) of the automatic vacuum degassing and dehydration device for transformer oil of the present invention.

[0019] Figure 2 This is a schematic diagram (II) of the automatic vacuum degassing and dehydration device for transformer oil of the present invention.

[0020] Figure 3 This is a schematic diagram (a) of the interior of the main unit housing in the automatic vacuum degassing and dehydration device for transformer oil of the present invention.

[0021] Figure 4 This is a schematic diagram (II) of the internal structure of the main unit housing in the automatic vacuum degassing and dehydration device for transformer oil of the present invention.

[0022] In the diagram, 1. Main unit housing, 2. First KF stainless steel vacuum bellows, 3. Housing casters, 4. Touchscreen LCD display, 5. Top-nozzle glass filtration flask, 6. Magnetic stirrer, 7. Vacuum hose, 8. Vacuum ball valve, 9. Buffer tank, 10. Rotary vane vacuum pump, 11. Oil mist filter, 12. Gas mass flow controller, 13. Vent ball valve, 14. Vacuum clamp pagoda connector, 15. Digital Pirani vacuum pressure sensor, 16. Second KF stainless steel corrugated vacuum tube, 17. Temperature sensor, 18. Magnetic stirrer. Detailed Implementation

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

[0024] Example 1

[0025] The present invention relates to an automatic vacuum degassing and dehydration device for transformer oil, such as... Figure 1 and Figure 2As shown, including the mainframe 1, the mainframe 1 side is provided with the total power air switch, touch liquid crystal display 4;The upper part of the mainframe 1 is provided with a horizontal plate, the horizontal plate is provided with a magnetic stirrer 6, the magnetic stirrer 6 is placed on the glass mouth filter bottle 5, the bottle mouth of the glass mouth filter bottle 5 is sealed by a rubber plug, a temperature sensor 17 is inserted into the glass mouth filter bottle 5, the glass mouth filter bottle 5 is filled with transformer oil, the temperature sensor 17 extends into the glass mouth filter bottle 5 through the rubber plug, and the temperature sensor 17 is inserted into the glass mouth filter bottle 5 to the 1 / 3 of the oil surface;The bottom of the glass mouth filter bottle 5 is also provided with a magnetic stirrer 18, and the bottom of the mainframe 1 is provided with a box moving universal wheel 3;

[0026] As Figure 3 And Figure 4 As shown, the bottom of the mainframe 1 is provided with a rotary vane vacuum pump 10 and a buffer tank 9, the rotary vane vacuum pump 10 is connected with the upper part of the buffer tank 9 through a first KF stainless steel vacuum corrugated pipe 2, and an oil mist filter 11 is installed on the exhaust hole of the rotary vane vacuum pump 10;The top of the buffer tank 9 is provided with a digital skinani vacuum pressure sensor 15, the bottom of the buffer tank 9 is connected with a venting ball valve 13 through a stainless steel pipe, and the middle part of the buffer tank 9 is connected with a gas mass flow controller 12 through a pipeline;The digital skinani vacuum pressure sensor 15 is connected with the top of the buffer tank 9 through a vacuum clamp.

[0027] The upper part of the buffer tank 9 is connected with a vacuum clamp tower joint 14 through a second KF stainless steel corrugated vacuum pipe 16, and a vacuum ball valve 8 is also arranged on the second KF stainless steel corrugated vacuum pipe 16, and the glass mouth filter bottle 5 is connected with the vacuum clamp tower joint 14 through a vacuum hose 7.

[0028] The digital skinani vacuum pressure sensor 15, the temperature sensor 17, the gas mass flow controller 12, the rotary vane vacuum pump 10, the magnetic stirrer 6 and the touch liquid crystal display 4 are connected with the PLC controller.

[0029] Example 2

[0030] The specific working principle of the transformer oil automatic vacuum degassing and dehydration device is:

[0031] First, the total power air switch is turned on, the temperature of each section of the transformer oil vacuum degassing and dehydration, the stirring speed of the magnetic stirrer, the vacuum degree and the processing time parameters are input through the touch liquid crystal display screen 4; the glass mouth filter bottle 5 containing the transformer oil to be treated is placed on the magnetic stirrer 6, the temperature sensor 17 is immersed in the oil 1 / 3, the vacuum hose 7 is connected to the glass mouth filter bottle 5, and the test is started through the touch liquid crystal display screen 4. At this time, the temperature and stirring speed control system composed of the magnetic stirrer 6, the temperature sensor 17 and the PLC controller controls the temperature and stirring speed of the transformer oil to be treated in the glass mouth filter bottle 5 according to the set parameters; the vacuum system composed of the rotary vane vacuum pump 10, the digital Pirani vacuum pressure sensor 17, the gas mass flow controller 12 and the PLC controller controls the vacuum degree of the vacuum system according to the set parameters. When the vacuum degree deviates from the set parameters, the control system adjusts the air intake of the gas mass flow controller 12 for adjustment.

[0032] Example 3

[0033] The transformer oil automatic vacuum degassing and dehydration method of the application is implemented according to the following steps:

[0034] Step S1: add the transformer oil to be treated in the glass mouth filter bottle 5, plug the bottle opening with a rubber plug, immerse the temperature sensor 17 in the oil 1 / 3, and then place it stably on the magnetic stirrer 6 with heating function;

[0035] Step S2: close the vent ball valve 13, open the vacuum ball valve 8, start the magnetic stirrer 6 and the rotary vane vacuum pump 10, and sequentially perform four-section vacuum degassing and dehydration;

[0036] First section: the stirring temperature is room temperature, the stirring speed is 150-200 revolutions per minute, the stirring time is 25-30 minutes, and the vacuum degree is 1000-1500 Pa;

[0037] Second section: the stirring temperature is 45-50℃, the stirring speed is 200-300 revolutions per minute, the stirring time is 25-30 minutes, and the vacuum degree is 500-600 Pa;

[0038] Third section: the stirring temperature is 45-50℃, the stirring speed is 400-500 revolutions per minute, the stirring time is 25-30 minutes, and the vacuum degree is 100-150 Pa;

[0039] Fourth section: the stirring temperature is 45-50℃, the stirring speed is 500-600 revolutions per minute, the stirring time is 60 minutes, and the vacuum degree is 50-60 Pa;

[0040] In the process of vacuum degassing and dehydration, the oil temperature is measured by the temperature sensor 17, and when it is lower than the set temperature, the magnetic stirring heater starts the heating function; the magnetic stirring speed is controlled by the function of the magnetic stirring heater; the vacuum degree is measured by the digital Pirani vacuum pressure sensor 15, and when the vacuum degree deviates from the set parameters, the air flow into the vacuum buffer tank is adjusted through the control of the gas mass flow controller 12.

[0041] Step S3, close the vacuum ball valve 8, pull out the vacuum hose 7, after the atmospheric pressure is restored, pull out the rubber plug, measure the gas content and water content in the transformer oil to be treated, if the requirements are not met, continue to step S2 until the requirements are met, complete the transformer oil vacuum degassing and dehydration test.

[0042] Example 4

[0043] The transformer oil automatic vacuum degassing and dehydration method of the application is implemented according to the following steps:

[0044] Step S1: add the transformer oil to be treated into the 5-liter glass mouth filter bottle 5, plug the bottle opening with a rubber plug, immerse the temperature sensor 17 into the oil at 1 / 3 of the height, connect the vacuum hose 7 to the glass mouth filter bottle 5, and then place it stably on the magnetic stirrer 6 with heating function;

[0045] Step S2: close the vent ball valve 13, open the vacuum ball valve 8, start the magnetic stirrer 6 and the rotary vane vacuum pump 10, and sequentially perform four-stage vacuum degassing and dehydration;

[0046] First stage: the stirring temperature is room temperature, the stirring speed is 200 rpm, the stirring time is 30 minutes, and the vacuum degree is 1000 Pa;

[0047] Second stage: the stirring temperature is 50℃, the stirring speed is 200 rpm, the stirring time is 30 minutes, and the vacuum degree is 500 Pa;

[0048] Third stage: the stirring temperature is 50℃, the stirring speed is 500 rpm, the stirring time is 30 minutes, and the vacuum degree is 100 Pa;

[0049] Fourth stage: the stirring temperature is 50℃, the stirring speed is 500 rpm, the stirring time is 60 minutes, and the vacuum degree is 50 Pa;

[0050] Step S3, close the vacuum ball valve 8, pull out the vacuum hose 7, after the atmospheric pressure is restored, pull out the rubber plug, measure the gas content and water content in the transformer oil to be treated, if the requirements are not met, continue to step S2 until the requirements are met, complete the transformer oil vacuum degassing and dehydration test.

[0051] The vacuum degassing and dehydration treatment results of different transformer oils under the above treatment conditions are shown in Table 1.

[0052]

[0053] From Table 1, it can be seen that after the transformer oil is treated by the device, the water content of the transformer oil can be reduced to below 10 mg / kg, and the gas content can be reduced to below 0.5%, both of which meet the requirements of the new oil purification index of 500 kV transformers.

Claims

1. An automatic vacuum degassing and dehydration method for transformer oil is implemented using an automatic vacuum degassing and dehydration device for transformer oil. The automatic vacuum degassing and dehydration device for transformer oil includes a main unit housing (1). A horizontal plate is provided on the upper part of the main unit housing (1). A magnetic stirrer (6) is provided on the horizontal plate. A glass top-nozzle suction flask (5) is placed on the magnetic stirrer (6). A temperature sensor (17) is inserted into the glass top-nozzle suction flask (5). A rotary vane vacuum pump (10) and a buffer tank (9) are provided at the bottom of the main unit housing (1). The rotary vane vacuum pump (10) is connected to the upper part of the buffer tank (9) through a first KF stainless steel vacuum bellows (2). A digital Pirani vacuum pressure sensor (15) is provided on the top of the buffer tank (9). A second KF vacuum pressure sensor (15) is connected to the upper part of the buffer tank (9) through a second KF vacuum bellows (2). The F stainless steel corrugated vacuum tube (16) is connected to the vacuum clamp pagoda connector (14), and the glass top-nozzle filtration bottle (5) is connected to the vacuum clamp pagoda connector (14) through the vacuum hose (7); the second KF stainless steel corrugated vacuum tube (16) is also equipped with a vacuum ball valve (8); the bottom of the buffer tank (9) is connected to the vent ball valve (13) through a stainless steel tube; the mouth of the glass top-nozzle filtration bottle (5) is sealed with a rubber stopper, and the temperature sensor (17) extends through the rubber stopper into the glass top-nozzle filtration bottle (5), and the temperature sensor (17) is inserted into 1 / 3 of the oil level in the glass top-nozzle filtration bottle (5); the bottom of the main unit housing (1) is equipped with a housing swivel wheel (3); an oil mist filter (11) is installed on the exhaust port of the rotary vane vacuum pump (10); characterized in that, The specific implementation is as follows: Step S1: add the transformer oil to be treated into the glass mouth filter bottle (5), plug the bottle opening with a rubber plug, immerse the temperature sensor (17) into the oil at 1 / 3 position, connect the vacuum hose (7) to the glass mouth filter bottle (5), and then place the magnetic stirrer (6) steadily; Step S2: close the emptying ball valve (13), open the vacuum ball valve (8), start the magnetic stirrer (6) and the rotary vane vacuum pump (10), and perform four-stage vacuum degassing and dehydration; First stage: the stirring temperature is room temperature, the stirring speed is 150-200 rpm, the stirring time is 25-30 minutes, and the vacuum degree is 1000-1500 Pa; Second stage: the stirring temperature is 45-50℃, the stirring speed is 200-300 rpm, the stirring time is 25-30 minutes, and the vacuum degree is 500-600 Pa; Third stage: the stirring temperature is 45-50℃, the stirring speed is 400-500 rpm, the stirring time is 25-30 minutes, and the vacuum degree is 100-150 Pa; Fourth stage: the stirring temperature is 45-50℃, the stirring speed is 500-600 rpm, the stirring time is 60 minutes, and the vacuum degree is 50-60 Pa; 2. The transformer oil automatic vacuum degassing and dehydrating method according to claim 1, characterized by, Step S3: close the vacuum ball valve (8), pull off the vacuum hose (7), measure the gas content and water content in the transformer oil to be treated after the pressure is restored, if the requirements are not met, continue to perform step S2 until the requirements are met, and complete the transformer oil vacuum degassing and dehydration test.

3. The transformer oil automatic vacuum degassing and dehydrating method according to claim 2, characterized by, The middle part of the buffer tank (9) is connected with the gas mass flow controller (12) through a pipeline; the digital Pirani vacuum pressure sensor (15) is connected with the top of the buffer tank (9) through a vacuum clamp; one side of the main box body (1) is provided with a total power air switch and a touch type liquid crystal display screen (4). The transformer oil automatic vacuum degassing and dehydration device further comprises a PLC controller, and the digital Pirani vacuum pressure sensor (15), the temperature sensor (17), the gas mass flow controller (12), the rotary vane vacuum pump (10), the magnetic stirrer (6) and the touch type liquid crystal display screen (4) are connected with the PLC controller.

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