Analysis of Voltage Transformer Failure Mechanism and Prevention Measures Based on ATP-EMTP

Targeting potential transformer (PT) analysis of faults and corresponding principles. This article first analyzes voltage transformer fault cases of different voltage levels and analyzes the fault characteristics of PT. Then it mainly focuses on the PT ferromagnetic resonance overvoltage and introduces the fault mechanism of PT. On this basis, an overvoltage model containing PT-type automated terminals was established and its influencing factors were analyzed. Finally, solutions and prevention measures for different types of PT faults were proposed, which will serve as a basis for future PT protection work has laid a certain foundation.