Simulation test device for gas production rule of local thermal fault of mixed insulating oil

Abstract

The invention discloses a simulation test device for a gas production rule of a local thermal fault of mixed insulating oil, and relates to the field of high-voltage electrical equipment insulation. The test device comprises a vegetable insulating oil storage device, a mineral insulating oil storage device, a test sample oil storage device, a first oil mixer, a second oil mixer, a high-temperaturefurnace and a waste oil collecting bottle. The accuracy of the composition proportion of the mixed oil is high; gas generated by faults does not escape; oil at the initial stage of the test is discharged to ensure the accuracy of the test result. Flow is centrally controlled, and operation is convenient; and a one-way valve prevents damage to the system due to rapid pressure increase caused by rapid temperature rise after oil flows into the high-temperature furnace. The tester is simple in structure, high in mixed oil preparation speed and uniform in mixing, the overheating fault generation temperature and type are closer to the reality, the test research result is accurate and reliable, and the problem in researching the characteristic gas generation rule of the mixed insulating oil under the action of heat energy is solved. The tester is suitable for the simulation test of the gas production rule of the local thermal fault of the mixed insulating oil.

Description

technical field [0001] The invention relates to the field of insulation of high-voltage electrical equipment, in particular to a simulation test device for the law of gas production in local thermal faults of mixed insulating oil. Background technique [0002] Insulating oil is widely used in power grid equipment, mainly for high-voltage electrical equipment, such as transformers, reactors, circuit breakers, transformers, bushings, cables, etc., for insulation, cooling and arc extinguishing. Common insulating oils include mineral insulating oil, synthetic insulating oil (such as silicone oil, alpha oil, beta oil, synthetic ester, etc.), natural ester insulating oil, mixed insulating oil, etc. Based on the low viscosity, low freezing point, high oxidation resistance of mineral insulating oil and the high ignition point, high aging resistance and complete degradation characteristics of vegetable insulating oil, the two are usually mixed to form a new mixed insulating oil to im...

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Problems solved by technology

[0004] It is extremely difficult to study the characteristic gas generation law of mixed insulating oil under the action of heat energy. On the other hand, there will be no overall high temperature overheating of the oil inside the operating transformer, and equipment failures are caused by local overheating, so it is necessary to simulate local hot spots; thirdly, the ignition point of mineral oil is around 160°C, and plant The ignition point of insulating oil is about 330°C. When the oil temperature exceeds the ignition point, it is very easy to cause a fire hazard.

[0005] Patent ZL201510020765.6 discloses a simulation test device for overheating failure of insulating oil. This device can only carry out the test of insulating oil with a single composition ratio, and cannot conveniently and quickly realize the test research of insulating oil with different composition ratios; The overheating contact area is much larger than the oil volume in the test device, which is inconsistent with the actual working conditions; the most important thing is that the overheating source heats the entire oil in the test device, and the oil temperature on the contact surface with the heat source will be far away. Much lower than the temperature of the heat source, resulting in a great deviation in the test conclusion

[0006] Patent 201810933546.0 discloses a transformer internal fault simulation experiment device. Although the device sets the hot spot inside the device, it still heats the insulating oil in the device as a whole. The temperature measuring thermocouple 14 is closely connected with two heating plates , the measured temperature is the temperature inside the heating plate, and the oil temperature on the contact surface with the heating plate is still far lower than the temperature tested by the galvanic couple 14, which leads to a great deviation in the test conclusion

[0007] Patent ZL201420228809.5 discloses a thermal failure simulation device for transformers. This device realizes the occurrence of high-temperature hot spots through a heater, and the temperature of the oil flow in the oil-paper container 3 is the same as the temperature of the heater; The test of insulating oil with composition ratio cannot realize the test research of insulating oil with different composition ratio conveniently and quickly; the second is that there is no check valve on the oil flow pipeline of the device, at high temperature, when the oil flows through the heater due to the sharp temperature High and decomposition, resulting in pressure rise in the oil pipeline and instantaneous return of oil; third, the capacity of the oil container 2 is small, and the oil flowing out of the heater enters from the top, and most of the low-molecular combustible gas generated by the pyrolysis of the oil escapes , but not dissolved in oil, resulting in serious deviation of test results

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