Method for evaluating risks of MOV (metal oxide varistor) of series capacitive compensator

The invention discloses a method for evaluating risks of an MOV (metal oxide varistor) of a series capacitive compensator. The method includes the steps of (1) acquiring parameters including preventive trial data and electric monitoring data of the MOV of the series capacitive compensator; (2) establishing characteristic quantity including failure modes and probability of risk occurrence, establishing an incidence matrix about the probability of risk occurrence and failure modes, and establishing the risk evaluation for the MOV of the series capacitive compensator. Based on preventive trials, unbalanced current and historical data, the method can evaluate series compensation risks, simultaneously breaks through design and manufacture problem of international high-energy high-capacity MOVs, and improves operation reliability of the series compensation system.