As for multiple faults of capacitor in HVDC transmission project

the kinds and quantity of the fault of capacitors for 7 circuits DC transmission system which are already in operation in China Southern Grid are analyzed statistically

and the results show that the fault of filter capacitor has major proportion.Such three types of faults of filter capacitor as joint heat

oil leakage and capacitance variations due to breakdown are studied. The influence of the capacitor fault is analyzed in detail from the aspects process

structure and engineering. Throughout the analysis

the improvement suggestion is given from the aspects of technical specification

operation and maintenance

which provides both the maintenance and construction personnel at site with reference.