金属化膜电容器自愈理论及规律研究

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Abstract The paper mainly studies the self-healing characteristics and its key influencing factors of metallized film capacitors. The research first indicates that the reduction of self-healing energy is the effective way to improve the lifetime and the reliability of the capacitors. The main influencing factors on self-healing process are studied by physical analysis and electrical parameter measurement. For the metallized film capacitor with sheet resistance above 30Ω/□: ①The breakdown and self-healing event begin when the electric field is 200V/μm. And the probability of breakdown increases to 80% when the electric field is 600V/μm. Thus the reliability of the metallized capacitors would decrease under high electric field. ②The demetallized area and duration time increases with the increasing self-healing energy. Self-healing energy is proportional to the second power of working voltage and is inversely proportional to the second power of sheet resistance. Using metallized film with high sheet resistance, the capacitance loss could decrease and the lifetime of the capacitors could increase. ③The self-healing energy decreases with larger inter-layer pressure with a consequence of smaller demetallized area and shorter duration time. In such condition, the capacitance loss and the reliability of the capacitors could be reduced and enhanced.

Key words： Metallized film capacitor self-healing energy self-healing probability duration time of self-healing demetallized area lifetime

Received: 25 July 2011 Published: 20 March 2014

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TM533+.3

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http://dgjsxb.ces-transaction.com/EN/ OR http://dgjsxb.ces-transaction.com/EN/Y2012/V27/I9/218

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