This application provides an
online method for treating
transformer oil leakage and a sealing and fastening structure, belonging to the field of online
transformer maintenance technology. The method includes: without shutting down the power supply to replace the original O-ring seals, a
rubber ring is added to the fixing bolts of the
flange cover plate to seal the outside of the
flange cover plate, thereby preventing insulating oil leakage at the fixing bolts; without disassembling the fixing bolts, the
transformer can be maintained online without shutting down the power supply, eliminating the need for generator load reduction and shutdown, avoiding a sudden increase in
power load when the power supply is restored, thus reducing the maximum demand value, ensuring the continuity of equipment operation and the stability of power supply, avoiding new load peaks, avoiding production interruption losses caused by power outages for maintenance, and increasing
economic benefits; simultaneously, when treating
transformer oil leakage online, the generator set can continue to generate
electricity while operating normally, consuming all the gas, avoiding the release of gas generated during transformer power outage maintenance, reducing resource waste and environmental
pollution.