Multi-channel discharge device for accelerating electrical aging of insulating silicone oil

Abstract

The invention relates to a multi-channel discharge electrical aging device for accelerating aging of insulating silicone oil. The device comprises an upper cover plate, a lower cover plate, a pressingflange, a pin electrode, a plate electrode, a tank body, an insulating sleeve, a connecting rod and a pin mounting plate. An external power supply is connected with the connecting rod to introduce required voltage to the pin electrode; the ground electrode is connected with the plate electrode, the pin electrode and the plate electrode are arranged in the glass tank body, the insulating siliconeoil is placed in the tank body, the cover plate and the tank body are fixed into a whole through the long bolts, and the whole device can contain the insulating silicone oil with the large size. An oil taking hole is formed in an upper cover plate for oil filling and taking operation, and an extension pipe is mounted at a lower cover plate. And oil extraction operation is carried out through the pipeline. 13 pins are mounted on the pin mounting plate, and the connecting rod is moved up and down by rotating the high-pressure guide rod positioning sleeve, so that the pin plate gap is controlled.The multi-pin electrode structure adopted by the invention can greatly shorten the time required for electrical aging at a relatively low voltage level.

Description

technical field [0001] The invention belongs to the field of electrical aging of insulating media, in particular to a multi-channel discharge device for accelerating electrical aging of insulating silicone oil. Background technique [0002] With the gradual transformation of urbanized transmission lines into underground cables, the safe operation of cables and cable accessories has become the basic guarantee for the safety of the entire power system. Compared with high-voltage cable bodies, cable terminals and joints are relatively weak links. The probability of line failures shows that the failure probability of cable accessories is about 70%. Therefore, the cable terminal is a key connection device, and its operation directly affects the safe operation of the cable line. [0003] As an indispensable accessory for connecting other electrical equipment when laying high-voltage cables, high-voltage cable terminals can be divided into many types according to their structure a...

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Problems solved by technology

[0004] However, during the operation of the line, the insulating oil filled in the cable terminal will be affected by external factors such as humidity, high temperature, strong electric field and impurities, and its mechanical and electrical properties will gradually age. , the aging degree of the insulating oil will gradually increase, which will greatly reduce the insulation performance of the terminal. In severe cases, it may lead to major accidents such as insulation breakdown and equipment burnout.

After the cable terminal is installed, the terminal will be sealed, and the insulating oil filled inside cannot be detected during operation. After the insulating oil ages, it will easily cause the cable terminal to heat up or even break down the insulation. Therefore, it is necessary to insulate the terminal. Research and analyze the aging characteristics of the oil, master the aging law of the terminal insulating oil, and ensure the safe operation of the power system

[0005] However, in the electrical aging process, for the common single-needle plate electrode model, a longer electrical aging time is often required. In order to save the time required for the experiment, the voltage level needs to be increased, and there are more serious problems at the high voltage level. Hazards to personal safety of test personnel

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