The design of the filter circuit, starting current check circuit and switchingsurge absorption-protection circuit in an auxiliary circuit of PFC is analyzed.
This paper introduced the new IEC60076 -4 test guidance of lightning surge and switchingsurge for power transformer and reactor, which is the new edition of IEC722 (1982).
The switchingsurge phenomena caused by line energization with out closing resistors but with MOA at both ends of the line, MOA's working conditions and insulation coordination are included.