电力系统保护与控制2012，Vol.40Issue(16)：106-110,5.
基于电子式互感器双A/D采样的差动保护可靠性方案研究
Research of the differential protection reliability scheme based on the electronic transformer double A/D sampling
李秀丽 1李文正 2鲍都都 3倪传坤 2李宝伟 2李杰 2杨飞4
作者信息
- 1. 华北水利水电学院,河南 郑州450011
- 2. 许继电气股份有限公司,河南 许昌461000
- 3. 河南省电力公司济源供电公司,河南 济源454650
- 4. 东北电力科学研究院有限公司,辽宁 沈阳110006
- 折叠
摘要
Abstract
The theory error of electronic instrument transformer double A/D sampling in smart substation and the abnormal sampling data can cause the differential protection misoperation. We analyze the critical conditions of this misoperation, and put forward a reliable scheme for differential protection based on double A/D sampling of electronic transformer. The scheme is based on sample instantaneous value judging, setting absolute deviation criterion and relative error criterion. The two criterion work together. When only one sample point gets abnormal data, we use linear interpolation algorithm to repair, and when successive two sample points have anomalies, we use latch-up protection. Theoretical analysis and simulation results show that the scheme can effectively guarantee the double A/D will not get latch-up protection mistakenly in normal work, when one of A/D is abnormal, it can get latch-up protection any time, and when double A/D is occasionally abnormal, protection device can still work reliably. The scheme shows a high reliability, small amount of calculation, certain anti-interference ability, and is easy to carry out, which can be widely applied in practice.关键词
智能变电站/电子式互感器/双A/D/差动保护/插值算法Key words
smart substation/ electronic instrument transformer/ double A/D/ differential protection/ interpolation algorithm分类
信息技术与安全科学引用本文复制引用
李秀丽,李文正,鲍都都,倪传坤,李宝伟,李杰,杨飞..基于电子式互感器双A/D采样的差动保护可靠性方案研究[J].电力系统保护与控制,2012,40(16):106-110,5.
