摘要
通过多种型式的微机接地选线装置的现场运行实践,认为中性点不接地系统采用零序功率方向法判线,理想状态下准确率可达70%～90%,但与零序电流方向性关系密切,易误判。谐振接地系统采用五次谐波电流法判线不可取,若条件允许采用残流增量法效果较好,开闭所宜采用有功分量法判线。信号注入法通用性较好,有其可取之处,但信号探测及处理方面宜作进一步完善。最后指出,高阻抗接地、绝缘导线断线等选线问题,仍有待于研究解决。
According to the site engineering practices of different microcomputer grounding wire selection devices,the grounding wire selection correctness of zero-sequence power direction method is about 70%～90%for neutral point non-grounding system under ideal conditions.It has closer relation with the zero-sequence current direction and the wrong judgment occurs quite often.The resonance grounding system should not apply the fifth harmonic current method.The residual-current-increment method has better effect if applicable.To the open-close station,the power distri-bution method should be applied.The signal-input method has better universality,but the further improvement should be made in signal probing and processing.The wire selection for high impe-dance grounding,insulated wire breaking,etc.should be continuously studied.
出处
《电力自动化设备》
EI
CSCD
北大核心
2003年第6期82-85,共4页
Electric Power Automation Equipment
关键词
配电网
单相接地
选线
power distribution network
single-phase grounding
wire selection
