微机保护采样数据异常问题的分析与对策

Analysis and countermeasures of problems about unusual sampling data in microprocessor-based protection

采样数据异常可能会导致微机保护的不正确动作,需要采取恰当的应对措施。对两次微机型变压器保护误动的调查分析表明,欲消除"异常数据"对保护动作行为的影响,在硬件上要充分考虑外围回路、采集系统、出口逻辑等环节的可靠性,软件上应进行数据的甄别和滤除,在保护算法和跳闸逻辑上也应有所考虑。

Unusual sampling data will cause incorrect action of microprocessor-based protection, which needs some reasonable countermeasures. The inquisition and analysis about two incorrect actions of transformer protection show that, to eliminate the effect of unusual sampling data on protection, in the design of software,the reliability of peripheral circuit, sampling system and trip logic, etc should be put all consideration, in the design of hardware, unusual data should be discriminated and percolated, so does the protection arithmetic and trip logic.