传统比率制动式母差保护同微机型母差保护的应用比较

Comparison of Application of Traditional Ratio Braking Type Bus Differential Protection with Microcomputer Type Bus Differential Protection

文章就传统比率制动式母差保护与微机母差保护的工作原理和性能,对母线运行方式的适应性、电流回路的“软件切换”、TA饱和的检测原理等进行对比,还对比率制动式差动元件在母线区外故障且TA饱和情况下的灵敏度、区内故障有电流汲出母线时的稳定性进行了较详细的定量计算和分析。综合阐述了使用和推广微机型母差保护装置的可行性和必要性。同时就母差保护在现场调试和应用中遇到的问题,进行了分析和解答。

According to the working principles and performance for the traditional ratio braking type bus differential protection with those of the microcomputer bus differential protection the paper compared the suitability of the bus operation mode, ＂software switchover＂ of the current circuit, inspecting principles of TA saturation, calculated and analyzed the sensitivity of the ratio braking type differential elements under failure out of the bus area and TA saturation, as well as the stability while the current oozed the bus under the failure in the section. It also illustrates the feasibility and necessity of application of the microcomputer bus differential protection.