In the safe and stable operation of distribution networks, reclosers bear the crucial responsibility of rapid fault isolation and automatic power restoration. Their operation and maintenance management level directly affects equipment availability and grid resilience. Faced with increasingly complex operating environments, the widespread adoption of intelligent equipment, and limited maintenance manpower, constructing a scientific and refined operation and maintenance management strategy has become a core issue for improving recloser efficiency.
The primary principle of operation and maintenance management is condition-oriented. Traditional periodic maintenance models are prone to over-maintenance or missed inspections, while condition evaluation based on online monitoring and offline testing data can achieve "repair only when necessary, and repairs that are effective." Modern reclosers are generally equipped with mechanical characteristic, electrical parameter, and environmental sensors, which can collect indicators such as opening and closing times, coil current, contact wear, temperature, and humidity in real time. Maintenance personnel need to establish a data analysis mechanism to promptly identify potential deterioration points, such as insufficient lubrication of the operating mechanism or decreased insulation of the arc-extinguishing chamber, through trend comparison and threshold warnings. This allows for the development of targeted maintenance plans, extending equipment life and reducing the probability of sudden failures.
Differentiated operation and maintenance (O&M) is essential for addressing diverse needs across various scenarios. Different line sections exhibit significant differences in functional positioning, load density, and fault probability, necessitating tailored O&M frequency and depth adjustments. For instance, reclosers on main lines and at critical user access points require intensive status inspections and protection setting verification; equipment on branch lines or temporary power supply lines can have more flexible maintenance cycles, emphasizing emergency availability. Simultaneously, for sections connected to distributed power sources, close attention should be paid to the recloser's operational logic and communication coordination under bidirectional power flow to prevent misjudgments leading to unplanned outages.
Collaborative O&M significantly improves handling efficiency. Reclosers are not isolated devices; their linkage performance with the distribution automation master station and adjacent protection devices determines the speed of fault handling. O&M management should integrate reclosers into the regional protection system for overall commissioning and testing, and regularly conduct cross-device fault simulation exercises to verify the timeliness of information exchange, command issuance, and execution. The O&M team also needs to establish a rapid communication mechanism with dispatch and emergency repair departments to ensure fault location and isolation strategies are implemented in the shortest possible time.
Furthermore, standardization and informatization are crucial for improving operation and maintenance quality. Establishing unified testing items, operating procedures, and judgment standards can reduce human error. Utilizing asset management systems or mobile terminal platforms enables electronic archiving and sharing of testing data, facilitating historical traceability and horizontal comparative analysis, and providing a basis for subsequent decision-making.
Overall, recloser operation and maintenance management should be based on condition assessment, combined with differentiated strategies and collaborative mechanisms, supplemented by standardized and informatized tools, to construct a closed-loop system covering prevention, monitoring, handling, and optimization. This not only ensures long-term reliable operation of equipment but also provides a solid guarantee for achieving the goals of intelligent upgrading and high resilience of the distribution network.
