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The Baise Bureau of China Southern Power Grid’s Ultra-High Voltage Division has found that the insulators’ performance is consistently good.
Release time:
2021-07-18
To accurately assess the insulation performance of porcelain insulators along the transmission line, from January 23 to 26, the Baise Bureau of China Southern Power Grid Ultra-High Voltage Company organized 36 operation and maintenance personnel to conduct insulation resistance tests on 20,708 ceramic insulators of the ±500 kV Xing’an DC transmission line over a period of four days. All the ceramic insulators were found to be in good condition.
To accurately assess the insulation performance of porcelain insulators along the transmission line, from January 23 to 26, the Baise Bureau of China Southern Power Grid Ultra-High Voltage Company organized 36 operation and maintenance personnel to conduct insulation resistance tests on 20,708 ceramic insulators of the ±500 kV Xing’an DC line over a period of four days. All ceramic insulators were found to be in good condition.
It is reported that the ±500 kV Xing’an DC transmission line’s bipolar system was commissioned in 2007 and 2008, respectively, and has been in operation for many years. On this line, tension towers and their tension insulator strings all use porcelain insulators, while some straight-line tower suspension insulator strings also employ porcelain insulators. Over prolonged service, porcelain insulators may develop cracks, exhibit low insulation resistance, or even reach zero resistance. Due to the inherent characteristics of porcelain insulators, such defects cannot be detected through ground‑based manual inspections or aerial inspections conducted by helicopters or drones. Furthermore, on‑line insulation resistance testing of porcelain insulators must be performed either live or with the line de‑energized to determine whether their insulation resistance is abnormally low or zero, thereby facilitating timely maintenance and replacement and ensuring the reliable and stable operation of the equipment.
The Baise Bureau of the China Southern Power Grid Ultra-High Voltage Company, in conjunction with a planned outage for maintenance on the Xing’an DC transmission line, conducted inspections on 49 tension towers and 10 straight-line towers, totaling 20,708 porcelain insulators. The inspection was carried out using advanced insulation resistance testers, ensuring high measurement accuracy. After four days of testing, all porcelain insulators passed inspection, demonstrating excellent insulation performance that meets operational requirements.
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Email：hcinsulator@163.com
Address：Industrial Park, Luxi County, PingxiangCity, Jiangxi Province
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