Experimental Evaluation of 5 kV, 2 kA, DC Circuit Breaker With Parallel Capacitor

This article describes design, operation and experimental testing of a mechanical DC CB (Circuit Breaker) with parallel capacitors. The topology resembles hybrid but there are possible advantages in the costs since main semiconductor valve is replaced capacitors, performance this breaker inserts counter voltage earlier. A detailed PSCAD model employed to support design analyse operating principles. 5 kV, 2 kA hardware demonstrator 1.5 ms disconnector opening time developed university laboratory. test results demonstrate successful breaking currents, measured for insertion capacitor around 290 μs. Further analysis evaluates stresses on key components, optimal timing LCS (Load Commutation Switch) margins current interruption.