人民长江2015，Vol.46Issue(10)：7-11,5.DOI:10.16232/j.cnki.1001-4179.2015.10.003
大型水电机组自适应注入式定子接地保护研究
Study on self-adaptive voltage-injection-based stator grounding fault protection of large hydropower generator-unit
吴礼贵 1吕晓勇1
作者信息
- 1. 三峡水力发电厂电气部,湖北 宜昌443000
- 折叠
摘要
Abstract
As the large hydropower generator-unit must be equipped with 100% stator grounding fault protection, the voltage-injection-based stator grounding fault protection system is installed in all the generator units of Three Gorges Hydropower Plant. However, it is founded in application that the measurement accuracy of the grounding resistance of the protection system varies with different operation conditions. Although the offset parameters are set at accurate values in static test of the generator, the test results change in dynamic test and so do the measurement results when nominal voltage is attained in the generator. To solve this problem, a study on the mechanism of voltage-injection-based stator ground fault protection is carried out, in which the errors caused by the variation of the parameters are analyzed. According to the test figures, the causes of big measurement er-rors in different operation conditions of the protection system are founded out and a self-adaptive voltage-injection-based sta-tor grounding fault protection is proposed. The application of the proposed protection system in the generator-units of Three Gor-ges Hydropower Plant by far shows that the measurement accuracy of the grounding resistance can be assured when the generator is in or out of operation.关键词
注入式/补偿值/自适应/定子接地保护Key words
voltage-injection-based/offset parameters/self-adaptive/stator grounding fault protection分类
建筑与水利引用本文复制引用
吴礼贵,吕晓勇..大型水电机组自适应注入式定子接地保护研究[J].人民长江,2015,46(10):7-11,5.
