Analyses on an electronic voltage transformer's failure by its resonance with very fast transient overvoltage and suppression

Abstract As voltage measuring devices are widely used in the high power system with a primary‐secondary‐fusion structure, electronic transformers directly connected to primary conductor and would face much more serious electromagnetic environments than general secondary equipment. result, they still experience failures even when protection measures adopted suppress overvoltages' amplitudes. To address this issue, an innovative method is proposed after analyses conducted on resonance between transformer overvoltage. Within method, air‐cored coil installed artificially shift its natural frequency dodge high‐frequency dominant component of transient overvoltage, avoiding aforementioned suppressing In addition, simulations laboratory tests prove method's validity.