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At present, the report format of relay protection tester’s traditional simulating calculation is not uniform, and can only provide a simple failure analysis of the power grid. As for the RTSD that can carry out complex analysis, theoretical requirements are too high and the price is very expensive. Aiming at this problem, this paper presents an EMTP-based complex failure real-time calculation module for relay protection tester. By building power system relay protection commonly-used transmission line model in EMTP, rewritten program embedded under DOS environment, writing the program to automatically generate COMTRADE standard format files and other researches, to achieve a low-cost computing module that can be used in relay protection test for complex failure calculation, can operate easily and can generate a unified reporting format.

Research and Implementation of Complex Failure Real-time Calculation Module in EMTP-based Relay Protection Tester