On August 9, 2025, a technical appraisal conference for new products – "Low Residual Voltage, High Surge Current 220kV and 500kV Gapless Metal Oxide Surge Arresters" – was hosted by China Machinery Industry Federation in Shenyang. Two high-voltage surge arresters independently developed by Dalian North Arrestor Co., Ltd. were recognized by the expert committee as having reached world-leading levels, marking a major technological breakthrough for the company in core arrester technologies and providing stronger support for the safe operation of EHV and UHV power grids.

The appraisal brought together top experts from China’s power industry. Presided over by Professorate Senior Engineer Chen Kui, the 17-member evaluation committee included authoritative experts such as Sun Quan, La Yuan and Zhang Boyu, ensuring a highly professional and rigorous review. Gao Yonghai, Deputy General Manager of the company, delivered a welcome speech. The technical team presented a full report on product development, technological innovation and test verification, and responded thoroughly to inquiries from the expert panel.
Following evaluation by professional groups, the two products achieved outstanding key performance: the Y10W-204/478 220kV arrester attained world-leading levels, while the Y20WZ-444/1106 500kV porcelain-housed arrester reached world-class standards, both successfully passing the technical appraisal.
Gapless metal oxide surge arresters are critical equipment for power grid overvoltage protection. Featuring both low residual voltage and high surge current capacity, the new products effectively reduce overvoltage stress on equipment and enhance power grid reliability. As China’s power grid advances toward EHV, UHV and intelligent development, this breakthrough provides high-end domestic equipment support for national power grid construction and delivers Chinese technologies and solutions to the global power industry.
The company stated that it will continue to increase R&D investment, focus on the demand for high-voltage and large-capacity power grids, optimize product performance, and provide safer and more reliable lightning protection solutions for the global energy sector.