A simulation test device for gas production law of mixed insulating oil in local thermal fault

Abstract

The invention discloses a simulation test device for the law of gas production in local thermal faults of mixed insulating oil, which relates to the field of insulation of high-voltage electrical equipment. It includes vegetable insulating oil storage, mineral insulating oil storage, test sample oil storage, first oil mixer, second oil mixer, high temperature furnace and waste oil collection bottle. In the invention, the composition ratio of the mixed oil has high accuracy; the gas generated by the failure does not escape; the oil at the initial stage of the test is drained to ensure the accuracy of the test result. Centralized flow control for easy operation; one-way valve prevents the oil from entering the high-temperature furnace and the temperature rises sharply, resulting in a rapid increase in pressure and causing damage to the system. The device of the invention has the advantages of simple structure, fast preparation speed of mixed oil, uniform mixing, overheating failure generation temperature and type closer to reality, accurate and reliable test and research results, and solves the difficult problem of research on characteristic gas generation law of mixed insulating oil under the action of heat energy. The device of the invention is suitable for the simulation test of the gas production law of the local thermal fault of the mixed insulating oil.

Description

Technical field [0001] The present invention relates to the field of high voltage electrical equipment insulation, and more particularly to a mixed insulating oil topical thermal fault gas law simulation test device. Background technique [0002] Insulated oils in the grid equipment, mainly used in high-voltage electrical equipment, such as transformers, reactors, circuit breakers, transformers, sleeves, cables, etc., insulation, cooling, heat dissipation, and arcing. Common insulating oils include mineral insulating oils, synthetic insulating oils (such as silicone oil, alpha oil, β oil, synthetic ester, etc.), natural ester insulating oil, mixed insulating oil, etc. Based on the low viscosity, low aggregation, high antioxidation resistance and plant insulating oil, high-resistance and complete degradation characteristics, which usually mix it, constitute new mixed insulating oil, improve its application performance To meet the needs of high-voltage power equipment with high-lev...

AI Technical Summary

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

Images