Technological Innovation Leads Industry Upgrade: New-Generation Intelligent Zinc Oxide Arrester Builds a Solid Power Safety Barrier
Technological Innovation Leads Industry Upgrade: New-Generation Intelligent Zinc Oxide Arrester Builds a Solid Power Safety Barrier
—— Dual Drive of Material Innovation and Intelligent Monitoring, Solving Extreme Environment Protection Challenges
With the accelerated construction of the new power system, UHV projects, new energy grid connection, and old power grid transformation have put forward higher requirements for lightning protection equipment. Recently, the new-generation Zinc Oxide Arrester integrated with multi-component doped resistor disc technology and intelligent online monitoring system has achieved large-scale application. Its breakthrough improvements in current carrying capacity, anti-aging performance, and fault early warning capability provide core protection for the safe and stable operation of the power system, driving the arrester industry to transform from "passive protection" to "active early warning".
Dual Breakthroughs in Materials and Structure, Addressing Core Industry Pain Points
For a long time, resistor disc degradation and sealing failure have been the two key issues restricting the service life of arresters, accounting for more than 85% of the total industry failure rate. The new-generation zinc oxide arrester has achieved fundamental breakthroughs through material science innovation: the resistor disc adopts a Bi₂O₃-Sb₂O₃-Cr₂O₃ multi-component doped system, combined with Spark Plasma Sintering (SPS) technology, with a current density of 300A/cm², far exceeding the 250A/cm² requirement of the national standard GB 11032-2000. Under the 0.75U1mA DC reference voltage, the maximum leakage current is ≤50μA, meeting the detection standards of the National Institute of Metrology (NIM). The annual growth rate of leakage current is controlled within 2%, significantly better than the industry average of 5%.
In terms of sealing protection, the product innovatively adopts a three-layer composite structure: "HTV Silicone Rubber Outer Protection Layer + Glass Fiber Reinforced Epoxy Resin Middle Layer + Fluororubber Nanoclay Inner Sealing Layer". The leakage rate is ≤6.65×10⁻⁵Pa·m³/s (tested by helium mass spectrometry leak detection method), successfully solving the problem of cracking and moisture absorption at the interface between the composite jacket and the flange. Targeting extreme working conditions such as high altitude and heavy pollution, the product can adapt to high-altitude areas above 4300 meters and seismic intensity of 9 degrees through optimizing the umbrella skirt inclination angle to 45° and adopting altitude correction coefficient design, filling the gap in UHV protection in high seismic zones and alpine regions. Its technology has reached the level of the first (set) major technical equipment in China's energy field.
Intelligent Monitoring Empowers Operation and Maintenance Upgrade, Enabling Full Lifecycle Management
The new-generation arrester is equipped with a multi-parameter online monitoring system, integrating high-precision active zero-flux through-core current transformers, capacitor voltage dividers and other sensors. It can real-time collect four core parameters: total current effective value, resistive current component, partial discharge quantity, and surface temperature. The measurement accuracy is 20% higher than the conventional industry level. When the monitored data exceeds the early warning threshold (e.g., total current >1.5mA, partial discharge quantity >50pC), the system will upload data in real-time through the IEC61850 protocol. Combined with the resistor disc aging model established by digital twin technology, it can predict the remaining service life with an error of less than 10%, and reduce operation and maintenance costs by 40%.
"Traditional arresters require regular power outage inspections, which not only affect power supply reliability but also make it difficult to detect early hidden dangers." A person in charge of operation and maintenance at State Grid Chongqing Jiangjin Power Supply Company stated that after installing the intelligent arrester on lightning-prone lines such as the 10kV Licha Line, the company accurately located hidden danger points through real-time monitoring data. The lightning trip rate decreased by 72%, and the single fault troubleshooting time was shortened from 4 hours to 30 minutes, which has cumulatively guaranteed the stable power supply for more than 4,000 households and enterprises.
Covering Full-Scenario Needs, Assisting the Implementation of Major Projects
With excellent adaptability to extreme environments, the new-generation zinc oxide arrester has been widely used in core fields such as UHV, new energy, and rail transit. In the Sichuan-Chongqing 1000kV UHV Ganzi Station project, its high-altitude and high-seismic design ensures the efficient transmission of clean energy. In the Brazil Northeast New Energy Transmission ±800kV UHV DC project, the product has successfully achieved a major breakthrough in the overseas market, becoming a benchmark case for the internationalization of domestic arresters.
In the new energy field, aiming at the outdoor operation characteristics of wind power and photovoltaic power stations, the product has optimized UV resistance and sand resistance design, with UV aging resistance time reaching 10,000 hours, and has been supporting multiple desert and Gobi large-scale base projects. In the communication field, the 6G-compatible arrester achieves full-band signal coverage of 50-6000MHz, with insertion loss controlled within 0.2dB, becoming a core lightning protection equipment for emerging scenarios such as 5G base stations and data centers.
Booming Industry Prospects, Technological Upgrade Drives Market Growth
Benefiting from the construction of the new power system, the expansion of new energy installed capacity, and the demand for old equipment renewal, the arrester industry has entered a period of rapid development. According to data from Zhiyanzhan Industry Research Institute, the market size of China's arrester industry reached 8.5 billion yuan in 2023, with a compound annual growth rate of 7.2% from 2018 to 2023, among which zinc oxide arresters accounted for 92%. China Report Hall predicts that the global arrester market size will exceed 30 billion US dollars by 2025, and China's market size will reach 20.5 billion yuan. UHV, new energy, and communication fields have become core growth engines. Only the new "Three AC and Nine DC" UHV projects during the "14th Five-Year Plan" period will drive the demand for more than 500,000 sets of arresters.
Industry experts said that with the requirement of the "Blue Book on the Development of the New Power System" to complete the installation of intelligent arresters in all existing 35kV and above substations by 2025, coupled with the incremental demand brought by the installation of over 1000GW of new energy during the "15th Five-Year Plan" period, zinc oxide arrester products with high performance, intelligence, and scenario-based advantages will usher in a larger market space, promoting the high-quality development of the power protection industry.