Automatic vacuum degassing and dewatering device and method for transformer oil

Abstract

The invention discloses a transformer oil automatic vacuum degassing and dewatering device which comprises a main machine box body, a horizontal plate is arranged on the main machine box body, a magnetic stirrer is arranged on the horizontal plate, a glass upper nozzle suction flask is placed on the magnetic stirrer, a temperature sensor is inserted into the glass upper nozzle suction flask, and a rotary vane type vacuum pump and a buffer tank are arranged in the main machine box body. The rotary-vane vacuum pump is connected with the buffer tank through a first KF stainless steel vacuum corrugated pipe, a digital Pirani vacuum pressure sensor is arranged at the top of the buffer tank, the upper part of the buffer tank is connected with a vacuum hoop pagoda joint through a second KF stainless steel corrugated vacuum pipe, and the upper glass nozzle suction flask is connected with the vacuum hoop pagoda joint through a vacuum hose. The invention further discloses an automatic vacuum degassing and dewatering method for the transformer oil. The device can be used for carrying out vacuum degassing and dewatering treatment on the transformer oil, the water content of the transformer oil can be reduced to below 10mg / kg, the gas content can be reduced to below 0.5%, and the working efficiency and the control precision are improved.

Description

Technical Field

[0001] The invention belongs to the technical field of transformer oil processing, and in particular relates to a transformer oil automatic vacuum degassing and dehydrating device, and also relates to a transformer oil automatic vacuum degassing and dehydrating method. Background Art

[0002] Transformer oil plays the main role of insulation, cooling and information carrier in electrical equipment such as transformers. Untreated transformer oil will absorb air and moisture in the dissolved environment and affect insulation properties such as breakdown voltage. Its gas content is about 10%, and its water content is 20-50mg / kg. It also contains H2, CH4 and C2H2, which affect the power industry's judgment of transformer failure. Therefore, before the power industry injects transformer oil into electrical equipment such as transformers, it must strictly vacuum degassing and dehydrating the transformer oil to meet the insulation performance requirements. For example, the water content of transformer oil injected into 500kV is required to be no more than 10mg / kg, the gas content is no more than 1%, and the breakdown voltage is no less than 65kV.

[0003] In order to evaluate the insulation performance of transformer oil, the transformer oil must also be vacuum degassed and dehydrated 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 under vacuum conditions for degassing and dehydration. Since the vacuum degree needs to be manually controlled, in order to prevent sudden boiling of the oil when the gas content and water content are high in the initial stage, the stirring speed must also be controlled. The vacuum degree and stirring speed need to be adjusted at all times, the vacuum degree fluctuates greatly, and the test accuracy and efficiency are low. Summary of the invention

[0004] The purpose of the present invention is to provide an automatic vacuum degassing and dehydrating device for transformer oil, which solves the problems of low efficiency and large fluctuation of vacuum degree of transformer oil vacuum degassing and dehydration in the prior art.

[0005] Another object of the present invention is to provide a method for automatic vacuum degassing and dehydration of transformer oil.

[0006] The technical scheme adopted by the present invention is that the transformer oil automatic vacuum degassing and dehydration device comprises a mainframe box, a horizontal plate is arranged on the upper part of the mainframe box, a magnetic stirrer is arranged on the horizontal plate, a glass upper mouth suction bottle is placed on the magnetic stirrer, a temperature sensor is inserted into the glass upper mouth suction bottle, a rotary vane vacuum pump and a buffer tank are arranged at the bottom of the mainframe box, 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 pagoda joint through a second KF stainless steel corrugated vacuum tube, the glass upper mouth suction bottle is connected to the vacuum clamp pagoda joint through a vacuum hose; a vacuum ball valve is also arranged on the second KF stainless steel corrugated vacuum tube; and the bottom of the buffer tank is connected to the venting ball valve through a stainless steel tube.

[0007] The present invention is also characterized in that:

[0008] The mouth of the glass upper mouth suction filter bottle is sealed by a rubber stopper, the temperature sensor passes through the rubber stopper and extends into the glass upper mouth suction filter bottle, and the temperature sensor is inserted into 1 / 3 of the oil surface in the glass upper mouth suction filter bottle; the bottom of the mainframe box is provided with a box moving universal wheel.

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

[0010] The middle of the buffer tank is connected to the gas mass flow controller through a pipeline; the digital Pirani vacuum pressure sensor is connected to the top of the buffer tank through a vacuum clamp; a main power air switch and a touch-type LCD display are arranged on one side of the main engine box.

[0011] It also includes a PLC controller, a digital Pirani vacuum pressure sensor, a temperature sensor, a gas mass flow controller, a rotary vane vacuum pump, a magnetic stirrer, and a touch-type LCD display screen, all of which are connected to the PLC controller.

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

[0013] Step S1: Add the transformer oil to be treated into a glass filter bottle with a top nozzle, plug the bottle mouth with a rubber stopper, immerse the temperature sensor into the oil at 1 / 3, connect the vacuum hose to the glass filter bottle with a top nozzle, and then place it steadily on a magnetic stirrer;

[0014] Step S2: close the vent ball valve, open the vacuum ball valve, start the magnetic stirrer and vacuum pump, and perform four-stage vacuum degassing and dehydration;

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

[0016] Step S3, close the vacuum ball valve, unplug the vacuum hose, and after returning to normal pressure, measure the gas content and water content in the transformer oil to be treated. If the requirements are not met, continue with step S2 until the requirements are met, and complete the transformer oil vacuum degassing and dehydration test.

[0017] The beneficial effect of the present invention is that the device can perform vacuum degassing and dehydration treatment on transformer oil, can reduce the water content of transformer oil to below 10 mg / kg, and the gas content to below 0.5%, thereby improving work efficiency and control accuracy, saving labor, and also providing theoretical support for industrial on-site vacuum degassing process conditions. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0019] Figure 2 The schematic diagram of the structure of the automatic vacuum degassing and dehydrating device for transformer oil of the present invention (II);

[0020] Figure 3 1 is a schematic diagram of the interior of the main engine housing in the automatic vacuum degassing and dehydrating device for transformer oil of the present invention (I);

[0021] Figure 4 2 is an internal schematic diagram of a main engine box in the automatic vacuum degassing and dehydrating device for transformer oil of the present invention.

[0022] In the figure, 1. mainframe box, 2. first KF stainless steel vacuum bellows, 3. universal wheels for box movement, 4. touch-screen LCD, 5. upper-mouth glass suction bottle, 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 joint, 15. digital Pirani vacuum pressure sensor, 16. second KF stainless steel corrugated vacuum tube, 17. temperature sensor, 18. magnetic stirrer. DETAILED DESCRIPTION

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

[0024] Example 1

[0025] The automatic vacuum degassing and dehydrating device for transformer oil of the present invention is as follows: Figure 1 and Figure 2As shown, it includes a main box body 1, and a main power air switch and a touch-type liquid crystal display screen 4 are arranged on one side of the main box body 1; a horizontal plate is arranged on the upper part of the main box body 1, and a magnetic stirrer 6 is arranged on the horizontal plate, and a glass upper mouth suction bottle 5 is placed on the magnetic stirrer 6, and the bottle mouth of the glass upper mouth suction bottle 5 is sealed by a rubber stopper, and a temperature sensor 17 is inserted into the glass upper mouth suction bottle 5, and transformer oil is contained in the glass upper mouth suction bottle 5, and the temperature sensor 17 passes through the rubber stopper and extends into the glass upper mouth suction bottle 5, and the temperature sensor 17 is inserted into 1 / 3 of the oil surface in the glass upper mouth suction bottle 5; a magnetic stirrer 18 is also arranged at the bottom of the glass upper mouth suction bottle 5, and a box body moving universal wheel 3 is arranged at the bottom of the main box body 1;

[0026] like Figure 3 and Figure 4 As shown, a rotary vane vacuum pump 10 and a buffer tank 9 are arranged at the bottom of the main engine 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, and an oil mist filter 11 is installed on the exhaust hole of the rotary vane vacuum pump 10; a digital Pirani vacuum pressure sensor 15 is arranged on the top of the buffer tank 9, the bottom of the buffer tank 9 is connected to the vent ball valve 13 through a stainless steel pipe, and the middle part of the buffer tank 9 is connected to the gas mass flow controller 12 through a pipeline; the digital Pirani vacuum pressure sensor 15 is connected to the top of the buffer tank 9 through a vacuum clamp.

[0027] The upper part of the buffer tank 9 is connected to the vacuum clamp pagoda joint 14 through the second KF stainless steel corrugated vacuum tube 16, and a vacuum ball valve 8 is also provided on the second KF stainless steel corrugated vacuum tube 16. The glass upper mouth suction bottle 5 is connected to the vacuum clamp pagoda joint 14 through the vacuum hose 7.

[0028] 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 all connected to the PLC controller.

[0029] Example 2

[0030] The transformer oil automatic vacuum degassing and dehydration device of the present invention has the following specific working principles:

[0031] First, turn on the main power air switch of the equipment, and input the temperature of each section of transformer oil vacuum degassing and dehydration, magnetic stirrer stirring speed, vacuum degree and processing time parameters through the touch-type LCD screen 4; put the glass upper mouth suction filter bottle 5 containing the transformer oil to be treated on the magnetic stirrer 6, immerse the temperature sensor 17 in the oil at 1 / 3, connect the vacuum hose 7 to the glass upper mouth suction filter bottle 5, and confirm the start of the test through the touch-type LCD 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 upper mouth suction filter bottle 5 according to the set parameters; the vacuum system composed of the 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 it by adjusting the air intake of the gas mass flow controller 12.

[0032] Example 3

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

[0034] Step S1: Add the transformer oil to be treated into the glass upper mouth suction bottle 5, plug the bottle mouth with a rubber stopper, immerse the temperature sensor 17 into the oil at 1 / 3, connect the vacuum hose 7 to the glass upper mouth suction bottle 5, and then stably place it 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 vacuum pump 10, and perform four stages of vacuum degassing and dehydration in sequence;

[0036] 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;

[0037] The second stage: stirring temperature is 45-50°C, stirring speed is 200-300 rpm, stirring time is 25-30 minutes, vacuum degree is 500-600Pa;

[0038] The third stage: stirring temperature is 45-50℃, stirring speed is 400-500 rpm, stirring time is 25-30 minutes; vacuum degree is 100-150Pa;

[0039] The fourth stage: stirring temperature is 45-50°C, stirring speed is 500-600 rpm, stirring time is 60 minutes; vacuum degree is 50-60Pa;

[0040] During the vacuum degassing and dehydration process, the oil temperature is measured by the temperature sensor 17. When it is lower than the set temperature, the magnetic stirring heater starts the heating function; the magnetic stirring speed is controlled by the built-in function of the magnetic stirring heater; the vacuum degree is measured by the digital Pirani vacuum pressure sensor 15. When the vacuum degree deviates from the set parameters, it is adjusted by controlling the air intake flow rate entering the vacuum buffer tank by the gas mass flow controller 12.

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

[0042] Example 4

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

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

[0045] Step S2: close the vent ball valve 13, open the vacuum ball valve 8, start the magnetic stirrer 6 and the vacuum pump 10, and perform four stages of vacuum degassing and dehydration in sequence;

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

[0047] The second stage: stirring temperature is 50°C, stirring speed is 200 rpm, stirring time is 30 minutes, and vacuum degree is 500 Pa;

[0048] The third stage: stirring temperature is 50°C, stirring speed is 500 rpm, stirring time is 30 minutes; vacuum degree is 100 Pa;

[0049] The fourth stage: stirring temperature is 50°C, stirring speed is 500 rpm, stirring time is 60 minutes, vacuum degree is 50 Pa;

[0050] Step S3, close the vacuum ball valve 8, unplug the vacuum hose 7, and after the normal pressure is restored, unplug the rubber plug, measure the gas content and water content in the transformer oil to be treated, and complete the transformer oil vacuum degassing and dehydration test.

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

[0052] Table 1 Vacuum degassing and dehydration treatment results of different transformer oils

[0053]

[0054] As can be seen from Table 1, after the transformer oil is treated by this device, the water content of the transformer oil can be reduced to below 10mg / kg, and the gas content can be reduced to below 0.5%, both of which meet the index requirements of 500kV transformer new oil after purification.

Claims

1. Automatic vacuum degassing and dehydration device for transformer oil, characterized in that: The invention comprises a mainframe housing (1), wherein a horizontal plate is arranged on the upper part of the mainframe housing (1), a magnetic stirrer (6) is arranged on the horizontal plate, a glass upper-mouth suction bottle (5) is placed on the magnetic stirrer (6), a temperature sensor (17) is inserted into the glass upper-mouth suction bottle (5), a rotary vane vacuum pump (10) and a buffer tank (9) are arranged at the bottom of the mainframe housing (1), and 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). The top of the buffer tank (9) is provided with a digital Pirani vacuum pressure sensor (15); the upper part of the buffer tank (9) is connected to a vacuum clamp pagoda joint (14) via a second KF stainless steel corrugated vacuum tube (16); the glass upper mouth suction bottle (5) is connected to the vacuum clamp pagoda joint (14) via a vacuum hose (7); a vacuum ball valve (8) is also provided on the second KF stainless steel corrugated vacuum tube (16); the bottom of the buffer tank (9) is connected to a venting ball valve (13) via a stainless steel tube.

2. The automatic vacuum degassing and dehydrating device for transformer oil according to claim 1, characterized in that: The mouth of the glass upper mouth suction filter bottle (5) is sealed by a rubber stopper, the temperature sensor (17) passes through the rubber stopper and extends into the glass upper mouth suction filter bottle (5), and the temperature sensor (17) is inserted into the 1 / 3 position of the oil surface in the glass upper mouth suction filter bottle (5); the bottom of the main housing (1) is provided with a housing moving universal wheel (3).

3. The automatic vacuum degassing and dehydrating device for transformer oil according to claim 1, characterized in that: An oil mist filter (11) is installed on the exhaust hole of the rotary vane vacuum pump (10).

4. The automatic vacuum degassing and dehydrating device for transformer oil according to claim 1, characterized in that: The middle of the buffer tank (9) is connected to a gas mass flow controller (12) via a pipeline; the digital Pirani vacuum pressure sensor (15) is connected to the top of the buffer tank (9) via a vacuum clamp; and a main power air switch and a touch-type liquid crystal display screen (4) are provided on one side of the main housing (1).

5. The automatic vacuum degassing and dehydrating device for transformer oil according to claim 4, characterized in that: It also includes 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 all connected to the PLC controller.

6. A method for automatic vacuum degassing and dehydrating transformer oil, using the automatic vacuum degassing and dehydrating device for transformer oil according to any one of claims 1 to 5, characterized in that: Follow the steps below to implement it: Step S1: Add the transformer oil to be treated into a glass filter bottle (5), plug the bottle mouth with a rubber stopper, immerse the temperature sensor (17) into the oil by 1 / 3, connect the vacuum hose (7) to the glass filter bottle (5), and then place it stably on a magnetic stirrer (6); Step S2: close the vent ball valve (13), open the vacuum ball valve (8), start the magnetic stirrer (6) and the vacuum pump (10), and perform four-stage vacuum degassing and dehydration; Step S3, close the vacuum ball valve (8), unplug the vacuum hose (7), and after the normal pressure is restored, 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, and complete the transformer oil vacuum degassing and dehydration test.

7. The automatic vacuum degassing and dehydrating method for transformer oil according to claim 6, characterized in that: In step 2, when four stages of 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; The second stage: stirring temperature is 45-50℃, stirring speed is 200-300 rpm, stirring time is 25-30 minutes, and vacuum degree is 500-600Pa; The third stage: stirring temperature is 45-50℃, stirring speed is 400-500 rpm, stirring time is 25-30 minutes, and vacuum degree is 100-150Pa; The fourth stage: the stirring temperature is 45-50°C, the stirring speed is 500-600 rpm, the stirring time is 60 minutes; the vacuum degree is 50-60Pa.

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