The widespread application for film high voltage capacitor in China has passed 20 years

either the manufacturer and customer point out that the index that the design field strength not over 57 k V/mm（k=1）of film capacitor

which defined by the reactive power compensation experts in China at that time is not applicable any longer and the design field strength shall be improved. It is concluded throughout the study on insulation withstand level of shunt capacitor with three-film structure from the leading capacitor manufacturers in China that this specification of the expert working group plays crucial role for the rapid development of film shunt capacitor in China

and further improvement of the design field strength shall be careful. The alteration of improving design field strength shall be carried out on the basis of comprehensive study

otherwise it will not be beneficial to the operation reliability of the capacitor.