Study on self-healing properties of metallized high-temperature dielectric films for capacitors
High temperature resistant metallized film capacitors(MFC)are urgently needed for high temperature applications in modern power electronic systems.While a large number of studies have shown that high temperature dielectric films have satisfactory energy storage properties,the self-healing properties are not yet known and this property is the key to determine whether high temperature dielectric films can be used in MFC.In this paper,the self-healing properties of three metallized high temperature dielectric films,namely,Polyethylene naphthalate(PEN),Polyether ether ketone(PEEK)and Polyimide(PI),at DC high voltage were investigated.The effects of external factors such as interlayer pressure,winding tension and temperature on the self-healing properties were specifically analysed.The results showed that PI is not suitable for application in MFC because of its high carbon content,which causes that is easy to breakdown and short-circuit in the experiment and lead to self-healing failure.The self-healing performance of PEEK is greatly affected by the interlayer pressure and winding tension.The wind-ing tension and the number of winding layers should be considered after the application of PEEK in MFC.PEN has low carbon content and excellent aliphatic-aromatic alternating structure,and has shown excellent self-healing prop-erties in various studies.From the perspective of self-healing,PEN is suitable as an insulating dielectric material for high temperature and strong electric field MFC.
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维普
