Zhoushan begins spring grid maintenance to ensure island power reliability

From March 8 to 11, State Grid Shengsi County Power Supply Company carried out its annual spring inspection and maintenance campaign for grid equipment across its jurisdiction, adhering to the principles of "comprehensive coverage, zero blind spots, stringent standards, and rapid defect resolution."

Recognizing that Shengsi's island-based power grid is particularly vulnerable to marine climate conditions — characterized by spring fog and high humidity that accelerate equipment corrosion and insulation aging — State Grid Shengsi County adhered to principles of advance planning and meticulous deployment. The company established a dedicated task force, refined maintenance protocols, clarified division of responsibilities, and coordinated the allocation of maintenance personnel, materials, and tools. Priority was given to critical infrastructure such as 110-kilovolt Shengsi and Liedao substations, 35-kV backbone transmission lines, essential distribution feeders serving townships, and power supply equipment for key public service institutions.

This maintenance operation employed a dual approach combining human expertise with technological safeguards. Advanced intelligent technologies — including UAV aerial inspection, infrared thermography, and partial discharge detection — were deployed to conduct precision diagnostics on transmission line towers, conductors, insulators, substation power transformers, switchgear, and circuit breakers. These technologies enabled focused monitoring of equipment operating parameters, systematic identification of line hazards, and remediation of corrosion defects, effectively compensating for the limitations of manual inspection while substantially enhancing both inspection efficiency and hazard identification accuracy.

On the maintenance frontlines, personnel braved the biting spring sea winds and overcame the challenges posed by the islands' rugged terrain to reach every corner of the archipelago. Strict adherence to electrical safety regulations and standardized work procedures was maintained throughout. Equipment operating status was verified item by item, with identified hazards and defects logged in comprehensive tracking systems for closed-loop management, ensuring immediate detection and correction, as well as comprehensive repair of all issues requiring attention.

This spring maintenance initiative focused on two core priorities: residential electricity supply and power assurance for enterprises' resumption of production. By balancing equipment operations with risk prevention and control, seasonal vulnerabilities across the grid infrastructure were systematically eliminated, enhancing the reliability of the power supply to the islands. Moving forward, State Grid Shengsi County will maintain rigorous oversight of spring maintenance progress and quality, ensuring refined operational maintenance that guarantees reliable power supply to the islands. This commitment provides robust electrical support for Shengsi county's high-quality economic and social development and ensures peace of mind for residents in their daily electricity consumption.