The DC-link capacitor for converter valve

in case of testing with the test items of the power electronic capacitor standard

exists some problems. The reference parameters for the capacitor is mainly lacked; The electrical performance of DC-link capacitor for domestic converter valve is tested in accordance with the requirement of GB/T 17702 standard specification. Since the production in China is at initial stage

the production equipment of some capacitor manufacturers is under improvement

which can not fully meet the standard requirement; In operation

the capacitance of the metallized film capacitor will decay slowly with the increase of time

there is no long term operation experience of related high voltage metallized film capacitor both at home and abroad and also of assuring long term reliable operation. Those issues are discussed in this paper and the main discussed test items include capacitance and loss tangent measurement

sealing test

thermal stability test

short circuit discharge test

destruction test

bursting energy test of case

self-healing test

and our own opinions and suggestions are proposed.