1. No Follow Current, Low Operational Load: Once an overvoltage event concludes, the zinc oxide resistor elements automatically revert to a high-impedance state. Unlike traditional surge arresters, there is no power-frequency follow current, eliminating the need for complex arc-extinguishing mechanisms and allowing for repeated protective operations.
2. High Current-Handling Capacity: The current-handling capacity per unit area of zinc oxide valve elements is approximately 4 to 5 times that of silicon carbide. They can withstand higher lightning currents and greater energy from switching overvoltages, making them well-suited for demanding conditions, such as environments prone to multiple lightning strikes.
3. Low Residual Voltage: At the same discharge current, the residual voltage is about 20% to 30% lower than that of silicon carbide surge arresters, providing more reliable insulation protection for equipment.
4. Rapid Response: With no spark-gap discharge delay, these arresters respond within nanoseconds. They are highly effective at suppressing steep-front overvoltages, reacting significantly faster than traditional surge arresters.
5. Simple, Compact Design: By eliminating spark gaps and complex arc-extinguishing components, the physical size can be reduced to one-third that of traditional products, while also requiring minimal maintenance.
6. Excellent Pollution Resistance: The gapless design prevents premature discharge caused by surface contamination, making these arresters ideal for use in highly polluted environments.