Zinc Oxide Surge Arrester with Thermal Explosion Disconnecting Device
Core Function
This advanced zinc oxide surge arrester is a critical overvoltage protection device for power systems, designed to safeguard transformers, switchgear, and other electrical equipment from lightning surges and switching overvoltages. It integrates a thermal explosion disconnecting device to enhance operational safety and system reliability.
Key Working Principles
Surge Protection: Under normal operating voltage, the zinc oxide varistor exhibits extremely high resistance, acting as an insulator with negligible leakage current. When a transient overvoltage (e.g., lightning strike) occurs, its resistance drops rapidly, diverting the surge current to the ground and clamping the voltage to a safe level, protecting connected equipment.
Thermal Disconnect Mechanism: In the event of sustained overvoltage or internal component failure, the arrester will overheat. The built-in thermal explosion disconnecting device is triggered by this excessive temperature: it physically separates the arrester from the power system, creating a visible open circuit. This prevents fire, explosion, or further damage to the system, and clearly indicates the faulty arrester for maintenance.
Product Advantages
Superior Surge Protection: High non-linear zinc oxide varistor provides fast response and excellent energy absorption capacity.
Built-in Safety Disconnect: The thermal explosion disconnecting device automatically isolates the faulty arrester, eliminating the risk of secondary hazards and ensuring system safety.
Reliable Sealing: Hermetically sealed design prevents moisture ingress and internal corrosion, ensuring long-term stability in outdoor environments.
High Mechanical Strength: Robust housing and mounting structure withstands extreme weather, seismic events, and electrical stress.
Easy Maintenance: The disconnect action provides a clear visual indicator of failure, simplifying inspection and replacement.
Wide Voltage Range: Available in models for various voltage levels (e.g., 10kV, 35kV, 110kV) to meet diverse power system requirements.
Typical Applications
Power Distribution Systems: Protecting distribution transformers, overhead lines, and switchgear.
Power Substations: Safeguarding main transformers, circuit breakers, and busbars.
Renewable Energy Systems: Wind turbines and photovoltaic inverters.
Industrial Facilities: Heavy-duty electrical equipment and critical production lines.
