1 036 MW机组高备变零序电压U0偏高的分析及处理
杨彪，曾向荣，李洪
（华能海门电厂，广东 汕头 515132）
摘 要：高备变是保证电厂发电机组安全运行的基础。针对华能海门电厂110 kV高备变在正常运行中零序电压异常升高情况，分析了其对系统的影响，讨论了引发异常的可能原因，经多方面论证并针对性排查，确定原因为高备变中性点引出线与接地电阻间腐蚀产生氧化铝致使中性点接地破坏所造成的，通过采取相应的处理及防范措施，保证了高备变恢复正常运行。
关键词：变压器；平衡绕组；零序电压；中性点接地
中图分类号：TM835 文献标识码：B 文章编号：1007-3175(2017)11-0038-03
Analysis and Treatment of High Zero Sequence Voltage U0 of High-Voltage Standby Transform in
1 036 MW Generator Sets
YANG Biao, ZENG Xiang-rong, LI Hong
（Huaneng Power International, INC. Haimen Power Plant, Shantou 515132, China）
Abstract: The high-voltage standby transformer is the basis to ensure the safe operation of generator sets in power plant. Aiming at the abnormal rise of zero sequence voltage during the normal operation of 110 kV high-voltage standby transformer in Huaneng Haimen power plant, this paper analyzed the influence on the system and discussed the possible, abnormal causes. After the demonstration and targeted investigation, it is found that the aluminium oxide formed because of the corrosion between the high-voltage standby transformer neutral point lead wire and the grounding resistance. The corresponding treatment and precautionary measures are adopted to ensure the high-voltage standby transformer get right operation.
Key words: transformer; balanced winding; zero sequence voltage; neutral-point earthing
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