Q: Causes of Film Capacitor Failure in Moisture

A: Humidity is the main cause of the degradation of the electrical parameters of film capacitors. This is because the molecule has a strong ability to diffuse, and the water dielectric constant is large, and the loss is also large, which causes the electrical performance of the capacitor to deteriorate rapidly. If the insulation resistance and compressive strength decrease, the dielectric loss tangent value increases and the capacitance changes. Especially when the ambient temperature rises, the diffusion ability of water molecules increases. Therefore, the high-temperature and high-humidity environment (such as 85 ° C, 85 percent RH) has a more significant impact on the electrical performance of the capacitor, resulting in increased product failure rates and reduced reliability.

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