In this paper, the failure analysis of commercial metallized film capacitors under different conditions of high temperature and humidity is carried out, the failure mechanism is mainly revealed, and the parameters in the publication of life prediction model are determined on the basis of existing data. The conclusions are as follows:
Under different humidity conditions, after a certain time, electrochemical corrosion occurs and the service life decreases rapidly. The service life of the capacitor decreases with the increase of humidity. The life prediction is carried out by power exponential model, and the failure coefficient is 4 under the failure condition of humidity.
The conclusions are as follows: Under different service temperatures, the life of the capacitor decreases with the increase of temperature. When the temperature is higher than 120 °C, both PP film and the electrode are damaged gradually, resulting in the trend of a large decrease in capacitance.
The experimental conditions are as follows: Place the metallized film capacitor (capacitance is about 20 μF) in a box-type resistance furnace, and adjust different service temperatures (60 °C, 80 °C, 100 °C, 120 °C, 140 °C, 160 °C, 180 °C) until the capacitor fails, then take out the capacitor.
The contact with oxygen caused the electrode oxidation and the capacitor failed. Under the high humidity (>69 % relative humidity, RH) service environment, water molecules and oxygen kept intruding into the interior of the capacitor, causing electrochemical corrosion and damaging the Al Zn layer on the capacitor film.
The failure test of metallized film capacitor adopts the method of high accelerated life test , . The failure test platform is composed of HS-50 L temperature humidity chambers and SX2–5-12 temperature test chambers. In this paper, the initial capacitance of the capacitor is taken as the reference value.
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