What is the basic law of capacitor damage, how to judge whether the capacitor is damaged?

Basic law of capacitor damage

(1) The damage rate of high voltage phase shifting capacitor is higher than low voltage capacitor;

② The damage rate of outdoor capacitors is higher than that of indoor capacitors;

(3) The damage rate of capacitors in summer is higher than that in other seasons;

(4) Large voltage fluctuation, more harmonic voltage, more frequent switching, close to resonant conditions and other factors make the damage rate of phase-shifting capacitor increase;

⑤ The damage rate of the capacitor without shunt resistance is higher than that of the capacitor with shunt resistance.

How to determine whether the capacitor is damaged?

In general, a multimeter can be used to check the capacitor for damage. When checking, first turn the multimeter selection knob to the ohm range RX1k or RX10k, and then contact both ends of the capacitor alternately with two meters. If the meter pointer has a certain deflection, and very soon back to the starting position, it indicates that the capacitor is intact; If the pointer does not return to the starting position after swinging, the resistance value indicated by the pointer is the leakage resistance value of the capacitor. If the pointer is deflected to zero ohmic position, it indicates that the capacitor internal short circuit; If the pointer does not move at all, there may be a break or failure inside the capacitor.