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The Service Life Of Film Capacitors Is Related To The Ambient Temperature
Jan 13, 2019

In each capacitor are marked on the tag its temperature category, for example: "- 40 / A", which means the capacitor can be put into power grid operation of low temperature to 40 ℃. And the capacitor can be run continuously high environment temperature for: Ih the average high temperature of 40 ℃, the average high temperature 30 ℃ for 24 h, the annual average temperature is 20 ℃. This is because at low temperature, the viscosity of the impregnation inside the capacitor increases, the internal voltage decreases, and the capacitance decreases.

Operating at a temperature lower than the allowable low temperature is likely to cause partial discharge within the capacitor, thus accelerating its electrical aging and reducing the actual service life of the capacitor. On the other hand, if the film capacitor runs at a higher temperature than its allowable temperature for a long time, it will accelerate the thermal aging of the capacitor. And its temperature should be chosen on the one hand, categories and the actual adapt to the environment temperature of condenser, on the other hand, pay special attention to in the capacitor installation using capacitor in the actual use condition of ventilation, heat dissipation and radiation problem, in the heat generated by the operation of the capacitor can be distributed in a timely manner, one thousand ways under the condition of high temperature reducing medium temperature inside capacitor and prolonging the service life of the capacitor practical purpose in order to achieve.