Abstract: With the growth of the economy, the demand for electricity is increasing. Due to regional differences, there are problems with the power structure. Difficulty in equipment power outage, often accompanied by power grid risks and load reduction for heavy loads and interconnection line power outages. The current promotion of condition based maintenance and differentiated maintenance methods has resulted in a large number of equipment in the power system that has not been in operation for many years, leading to insufficient deformation of some springs due to long-term stress or severe ash accumulation in the mechanism due to poor weather conditions, resulting in refusal to operate. The key point of our research is to eliminate potential operational risks of primary and secondary equipment by completing the test through line protection with load and transmission.