Abstract: The use of closed clamps to replace single-piece abnormal insulators is one of the maintenance tasks often carried out in the power transmission maintenance profession. The average operation time of the traditional operation process is 56 minutes, which is long, risky, and physically demanding for the operators, increasing the risks of the operation. The QC team optimized the operation process by finding the crux of the problem and formulating corresponding policies, shortening the total operation time to 28.2 minutes and 49.6% in operation time, improving on-site operation efficiency and reducing operation risks.