Power equipment is a core component of the power grid, and its operating status is directly tied to the stability of the entire power system. The detection, monitoring and maintenance of power equipment are critict generally adopted two approaches: fault-based maintenance and periodic maintenance. Fault-based maintenance is conducted only after a al measures to ensure the reliable operation of the power grid. In the past, maintenance of secondary equipmengrid fault occurs, which has inherent lag and potential safety risks. With the steady growth in the number of secondary equipment, periodic maintenance lacks targetedness, leading to severe waste of human and material resources. It may also result in failure to eliminate potential safety hazards in a timely manner because the scheduled maintenance period has not yet arrived.

Condition-based maintenance of secondary equipment is based on long-term and massive operational data, combined with advanced fault diagnosis technologies. It enables abnormal diagnosis and location of equipment, predicts potential equipment faults, and arranges maintenance items and cycles in a rational manner. According to the actual operating conditions of equipment, it conducts condition monitoring of secondary equipment to identify hidden faults, determine the location of such hazards and evaluate fault levels, thus pinpointing the optimal maintenance time for secondary equipment. Its core components include condition monitoring, fault diagnosis, condition evaluation and abnormal early warning.

The BDZ-101 Relay Protection Condition Monitoring and Analysis & Diagnosis System for Smart Substations developed by Wuhan Haomai Electric Power fully complies with the IEC61850 standard. It monitors GOOSE messages, SV messages, virtual circuit information, protection device settings and zone numbers, soft pressure plates, hard pressure plates, sampled values, self-test alarms, state change information, action events, fault recording messages and other data. It achieves full closed-loop monitoring of secondary equipment in smart substations from the process layer and bay layer to the station control layer.

△ BDZ-101 Relay Protection Condition Monitoring and Analysis & Diagnosis System for Smart Substations

△ BDZ-101 Communication Structure Diagram

The BDZ-101 system conducts long-term monitoring of the status information of all secondary equipment in a substation. Based on the accumulated long-term and massive monitoring data, it compares the concurrent data of the same device and different devices, performs intelligent statistical analysis of over-limit early warning data, conducts intelligent diagnosis and location of defective devices, and generates device defect and fault reports. Integrating multi-dimensional and multi-source data, the system can quickly diagnose fault points in the secondary circuit status, conduct real-time analysis of dynamic link abnormalities, and rapidly locate device link defects. It uploads data through the configured standard IEC61850 interface, providing a solid data foundation and decision-making basis for the condition-based maintenance of secondary equipment, and thus ensuring the safe and stable operation of the power system.