Metallized film capacitors（MFC）own characteristics of self-healing and can be used in high electric fieldstrength applications. Also

MFC has high working reliability and high power density. Currently

MFC has beenwidely used in low voltage AC/DC filtering and pulse discharge applications. However

the application in highvoltage AC filtering is rarely reported. The metallized film capacitor investigated in this paper is used for reactivepower compensation. High temperature has an adverse effect on the working stability and lifetime of metallized filmcapacitor

so it is necessary to investigate the temperature rise characteristic and optimization measures. This paperanalyzed the heat transfer process inside the capacitor and calculated the heat power and heat dissipation of thecapacitor. A simulation model is built with reasonable simplification

and the temperature rise of the capacitor whenAC current flow through is calculated. The simulation result is verified by test result. On the basis

the structure andparameters are chosen by optimized design. The investigation indicate that in a proper selection range

MFCdesigned based on thicker film

smaller film width and element scooping facing the main face of the shell will reducethe temperature rise in MFC.