Analysis and countermeasures of problems about unusual sampling data in microprocessor-based protection
Zhang Hong · Relay · 2005
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.