One of the causes of transformer failure is dielectric breakdown, which is mainly caused by partial discharge, which causes insulation deterioration and even breakdown. With the development of transformer fault diagnosis technology, people gradually realize that partial discharge is the root cause of many faults and accidents of transformers, so the test of partial discharge is getting more and more attention. In recent years, 50% of power transformer accidents above 110kV are caused by inter-turn short circuit under normal operating voltage, and also caused by partial discharge. Therefore, partial discharge measurement has been taken as one of the important projects for 220kV transformer handover and overhaul. Condition monitoring and troubleshooting will be very effective.
Through the discussion of transformer-related tests, we can see that in the handover test, the relevant test of the transformer is the inspection of the overall insulation of our transformer.
Only by conducting an effective insulation test on the transformer can we judge whether the insulation of the transformer meets our operational requirements. This is the main means by which we can judge whether the transformer can be put into operation.