A new method for the research of electrode-end contact degradation of metallized polypropylene pulse capacitors

The disconnection of “sprayed ends” from the electrode edges of metallized polypropylene pulse capacitors is studied. Some new special experimental samples, which are similar to the construction of the metallized film capacitor, are used to test the influences of the electric stress and the mechanical stress toward the connection between “sprayed-ends” and the electrode edges of the metallized film. Comparative experiments are also carried out on the new samples. The results obtained show that electrode-end contact degradation under high electric stress is more related to the mechanical stress, which depends on the peak value of the current pulse, rather than the energy content of the current pulse