Among them, the working frequency of the relay system, the atmospheric environment, and the configuration of the contactor contact are all one of the fault occurrence conductors of the relay contact. Any factor that cannot match the preset value may cause the relay contact When a failure occurs, the main manifestations of the failure are metal electrowinning, contact welding, and contact wear. These faults will affect the reliability of the relay contact to a large extent, and then affect the safe operation of the entire power system.

 

       Switching equipment failure of relay protection system

 

       Switching equipment failures in the electromechanical system are mainly caused by the mismatch between the relay protection system and the power system. The selection of the electromechanical protection device should be carried out first. There are scientific regulations for the working intensity of the power system. If it occurs When the relay protection device is aging or overloaded, it will cause the switchgear of the relay protection system to appear load-intensive.

 

       Current mutual inductance saturation fault

 

       As the terminal load of the relay protection device continues to increase, a short circuit will also occur during the operation of the power system, and the blocking command issued when the relay protection detection system detects a power system failure will also occur with excessive current. The sensitivity is reduced.