COMPARISON OF SYNTHETIC TEST CIRCUITS FOR ULTRA-HIGH-VOLTAGE CIRCUIT-BREAKERS

Three synthetic test circuits to verify the interrupting performance o f Ultra-High-Voltage circuit breakers (765kV-63kA-50Hz) are compared o n aspects of equivalence, operation, required capacitive energy and ap plicability. The comparisons show that, although each circuit has its own merits, the EPIC circuit appears to be very attractive. The EPIC c ircuit not only saves on capacitive energy but has also a good equival ence with the direct test circuit.