Improved Testing Method Using the Multi-Transformers Synthetic Circuit to Verify Capacitive Charging Current Switching Capability of High-Voltage Circuit Breakers

To perform a capacitive current switching test (CCT) at AC extra-high-voltage (EHV) and above level, this paper proposes new multi-transformer synthetic circuit (MTSC) method that replaces the general using capacitor banks. An MTSC has simpler structure compared to other testing methods higher equivalence (especially recovery voltage TRV) validity. Using method, CCTs for breakers (CBs) of 420 kV class were performed as field IEC 62271-100 standard. verify was valid, results analyzed with requirements Consequently, completely covered