A synthetic test circuit for current switching tests of HVDC circuit breakers

High voltage direct current (HVDC) circuit breaker current switching test in a test laboratory is difficult due to the limited test power installation. Reproduction of test stresses by means of direct testing confronts huge investment. Synthetic testing, as an alternative method, could amplify the test power more than ten times with a relative low cost. A synthetic test circuit based on the most used parallel current injection method was developed for the current switching test of HVDC circuit breakers. This synthetic test circuit could reproduce the current and voltage stresses equal to or greater than those could meet in service.