发电机失步保护整定计算所用的等值联系电抗Xcon研究-与现行《大型发电机变压器继电保护整定计算导则》商榷.pdf

第42卷第7期 电力系统保护与控制 Vol.42 No.7 2014年4月1日 Power System Protection and Control Apr.1 2014 发电机失步保护整定计算所用的等值联系电抗Xcon研究 —与现行《大型发电机变压器继电保护整定计算导则》商榷 张项安，姚晴林，陈海龙 (许继电气股份有限公司，河南许昌461000) 摘要：现行《大型发电机变压器继电保护整定计算导则》有关发电机失步保护整定计算中发电机机端与无限大系统间的等值 联系电抗Xn的计算公式欠妥，值得商榨.对此问题进行深入分析，得出发电机失步保护整定计算中所用的X正确的计算 方法.并在同一系统振荡工况下依照该计算方法所得的Xo值与依照《导则》的计算方法所得的X.值进行对比分析，分析 结果表明：《导则》的整定计算方法极可能导致失步保护拒动，而所提整定计算方法能确保失步保护可靠动作. 关键词：失步保护；发电机失步保护；联系电抗；系统电抗 Research on equivalent contact reactance Xcon setting calculation for generator out-of-step protection -discuss with Guide of Calculating Settings of Relay Protection for Large Generator and Transformer ZHANG Xiang-an YAO Qing-lin CHEN Hai-long (XJ Electric Co. Ltd Xuchang 461000 China) Abstract:The calculation formula of equivalent reactance Xoon between generator and infinite system for generator out-of-step protection in the current "Guide of Calculating Settings of Relay Protection for Large Generator and Transformer"is improper it is questionable.This paper has researched this problem deeply and obtained the correct method of the Xoon setting calculation for generator out-of-step protection and pared the Xcon values calculated by the proposed calculation method an...