Contact resistance measurement on contacts for an Ultra Fast Disconnector

Inhalt:
The growing need of an HVDC grid requires the development of HVDC circuit breakers. One possible topology is the hybrid HVDC CB. The mechanical Ultra Fast Disconnector determines its performance. The UFD has to separate the contacts within a few milliseconds and provide a low loss current path. To achieve this goal, the development is split into different tasks; one task contains the development and testing of high current contacts. To test such contacts, a test stand was built which allows measuring the contact resistance and heat distribution of the contacts. With this test stand it is possible to test a number of different contact shapes and experimentally verify their performance. The first measurements could be carried out and the results are promising.