Description of 1000kV Series Porcelain - Housed Metal Oxide Surge Arresters

The 1000kV Series Porcelain - Housed Metal Oxide Surge Arresters are crucial protective devices for ultra - high - voltage (UHV, 1000kV) power transmission and transformation systems. They are installed in 1000kV substations, transmission lines, and associated key equipment (such as transformers and circuit breakers). These arresters are designed to suppress overvoltages caused by lightning strikes, switching operations, and system faults. Encased in high - strength porcelain housings, they utilize advanced metal oxide varistor (MOV) technology. By diverting excessive surge currents to the ground and maintaining stable voltage levels during normal operation, they safeguard the integrity and reliability of 1000kV UHV power grids, preventing equipment damage and large - scale power outages.

Features of 1000kV Series Porcelain - Housed Metal Oxide Surge Arresters

• UHV Voltage Adaptability：Specifically engineered for 1000kV UHV power systems, with a rated voltage precisely matching the 1000kV grid requirements. It can effectively limit overvoltages within safe ranges even under extreme surge conditions, ensuring the stable operation of large - scale UHV transmission networks.

• Robust Porcelain Enclosure：The porcelain housing provides outstanding mechanical strength and environmental resistance. It can withstand harsh environmental factors like high humidity, industrial pollution, wide temperature variations (from - 40°C to 60°C), and strong seismic activity. This enclosure offers reliable electrical insulation and physical protection for internal components, ensuring long - term stable operation.

• High - Performance MOVs：Equipped with state - of - the - art metal oxide varistors (MOVs). These MOVs exhibit excellent non - linear resistance characteristics. During overvoltage events, they rapidly conduct surge currents, and under normal operating conditions, they revert to a high - resistance state, minimizing leakage current (usually less than 100μA). This low leakage current reduces energy losses in the power system and enhances the overall efficiency of the arrester.

• Exceptional Surge Withstand Capacity：Capable of handling extremely large impulse currents (up to several hundred kA) generated by lightning strikes or switching surges. This high surge tolerance effectively protects adjacent power equipment (such as transformers and circuit breakers) from voltage spikes, preventing equipment damage and ensuring the continuity of power supply.

• Series Configuration Compatibility：Designed for series connection to meet the 1000kV voltage level requirements. Integrated with voltage - grading devices (such as grading capacitors or rings), it ensures uniform voltage distribution across multiple arrester units in a series. This uniform distribution enhances the stability and reliability of the entire 1000kV UHV power protection system.

• Low Maintenance Requirement：The porcelain housing has good corrosion resistance and self - cleaning properties in most natural environments, reducing the frequency of maintenance. Additionally, many models are equipped with monitoring ports for leakage current and temperature detection. These ports enable predictive maintenance, allowing operators to detect potential faults in advance and take preventive measures, reducing unplanned outages.

• Compliance with International Standards：Adheres to strict international industry standards such as IEC 60099 - 4 and ANSI/IEEE C62.11. This compliance ensures its compatibility with 1000kV power systems worldwide and guarantees that it meets the highest safety and performance benchmarks in the power industry.

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