Hidden Fault Diagnosis Method of Relay Protection Equipment Based on Multi-layer Collaboration of Equipment, Substation Control and Centralized Control

The safe and reliable operation of the new electric power system urgently needs to discover the hidden fault of relay protection equipment in time. This paper proposes a hidden fault diagnosis method based on multi-layer collaboration. Firstly, the characteristic parameter of hidden fault identification is proposed. Then according to the characteristics of the three layers, it is proposed to judge whether the key characteristic parameter of a single relay protection equipment exceeds the threshold. At the substation control layer, on the one hand, the operation information of relay protection equipment of cross intervals is comprehensively applied, and on the other hand, relying on the storage resources of the substation control layer, the changing trend and fluctuation characteristics of the operation data of relay protection equipment are analyzed. The centralized control layer comprehensive analyzes cross-substation information. Case studies verify the effectiveness of the proposed method.