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Detection Technology

Several factors of partial discharge

time:2021/3/6   source:华天电力  reading:241 time

First of all, the partial discharge test should be performed in the shielded room in use. The shielding device used by Zhuan can effectively shield external interference signals. If you use it on site, we need to pay attention to many details, such as large electromagnetic interference on site and grounding. The conditions, noise, etc., may affect the results of the partial discharge test.


Before the measurement, we still have to power off some electrical equipment, and then measure the ground resistance with a large grounding resistance tester to ensure that the ground resistance is very good. If the conditions are not suitable, it is recommended to measure the partial discharge in the middle of the night, so that the voltage is relatively stable , Electromagnetic interference is relatively small. Of course, this is only a relatively common way to deal with interference. If the interference on site is not enough, it is recommended to add a shielded room.


Partial Discharge Detector.png


Several factors of partial discharge


The electric field is too concentrated at a certain point; b. The solid medium has bubbles and harmful impurities have not been removed; c. The oil contains water, gas, and suspended particles; d. In different medium combinations, there are serious electric field distortions at the interface.


Partial discharge is mainly used to check whether large-scale electrical equipment has local defects in the discharge source. With the increasing voltage level and capacity of the power system, the measurement of partial discharge of transformers has received more and more attention from large-scale power transformer operation and management units. , It is one of the important indicators to determine the reliability of the insulation system. In addition, the partial discharge tester can also analyze whether there is an area with excessive dielectric strength inside the transformer, and effectively reduce the hazards that can be caused by the long-term safe operation of the transformer. Partial discharge of transformers can be used for power transformers, transformers, and lightning arresters


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