In this paper

the burning reason of filtering branch capacitor and reactor elements in low voltage dynamic passive filter project is analyzed and comprehensive analysis is made from such aspects as filter design

element parameter

system imbalance

zero switching mode and variation of external environment etc. It is confirmed that the fault is mainly due to the quality of filtering branch capacitor can’t meet harmonic requirement. And several issues needing attention during the design and manufacturer of low voltage filter are proposed throughout analysis of this fault.