The short-circuit fault characteristics of the potential transformer(PT)based on the three-phase 4PT connection method are analyzed,and the variation patterns are derived.Firstly,theoretical analysis is conducted on the secondary three-phase voltage and zero sequence voltage values under a typical 4PT wiring method.Secondly,based on the design parameters of PT,a finite element model is established to simulate and calculate the capacitance,inductance,resistance and other parameters related to the winding,and a refined equivalent circuit model is constructed based on the parameters.Once again,based on the three-phase 4PT wiring method,a detailed analysis is conducted on the phenomenon of PT short-circuit faults and the changes in electrical characteristics of each PT after the occurrence of short-circuit faults.Finally,combined with a refined circuit model,the electrical characteristic changes after PT short-circuit fault are verified through Matlab modeling and simulation,confirming the correctness of the electrical characteristic changes.The research results provide an important basis for the online monitoring method of PT short-circuit faults,which is conducive to real-time and accurate monitoring of PT's health status without exiting the operation or disassembly.
Three-phase 4PTshort circuit of PT windingelectrical characteristic quantityrefined equivalent circuitzero sequence PTANSYS finite element simulationneutral point voltage
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