摘要
介绍了应用高压变频器对电流互感器测量和电动机差动保护的影响,并就如何消除这些不利因素进行了分析,可用茹可夫斯基线圈系统进行电流测量,解决因频率宽范围变化导致电磁式电流互感器测量不准的问题;还可采用基于采样值差动原理的频率跟踪方案实现差动保护功能。研究电厂应用高压变频器后对电动机继电保护配置和整定的影响,有重要的现实意义。
Introduction was made to the impacts on current transformer measurement and motor differential protection after application of high-voltage converter, and how to remove these unfavorable factors was analyzed. Rogowski winding system could be applied to carry out current measurement which solved the problem of electromagnetic current transformer＇s incorrect measurement due to frequency fluctuating drastically, and also could adopt frequency tracing method based on sampling value differential principle to achive differential protection function. There is great practical significance to study the impacts on motor relay protection disposition and rectification of power plant after application of high-voltage converter.
关键词
电动机继电保护
高压变频器
采样值差动保护
motor relay protection
high-voltage converter
sampling value differential protection
