Temperature should not be lower than the temperature of the surrounding environment, or should be the vacuum filter oil circulation heating, heating the transformer, so that the body temperature is higher than the ambient temperature of 5 degrees celsius. Checker, by the person, was wearing special maintenance work clothing and shoes, and wear clean gloves, cold weather should also wear masks, lighting must be used for low-pressure line lamp. Access to the body of the use of the tool should be kept and should be kept in custody and should be numbered to prevent the legacy in the tank and the body; into the transformer tank maintenance, ventilation should be considered to prevent the work of personnel.