Computer simulation programs to systematically screen protective relay applications for electric power distribution
[Pages 28,52,G:24,G:48 missing] Using EMTDC, an advanced closed-loop simulator, a set of network application tests is created in COMTRADE file format. The COMTRADE files created may be used to control an injection set or sets, which, in-turn, automatically inject protective devices. Part of the aim of the research has been to standardise the application tests, so that the testing of each device does not require a large number of calculated settings. The set of application tests simulate various network configurations, faults, loads, sources and devices. The tests are designed to highlight limitations within the protective schemes or their application within real networks. These limitations may take the form of incorrect settings and/or masking to certain applications. The application tests do in no way seek to supersede the necessity for qualification and/or acceptance testing. The tests are repeatable on any number of protective schemes and are independent of the test engineer. Although the test engineer is required to calculate and apply settings to the device being tested and to set up the test facility correctly, he/she cannot alter the test program in any way. In this way, protective devices are screened in a scientific manner to reveal their limitations in certain applications. A simulated nominal network model is developed by using a real network with its connected plant as the basis for the simulation model input data.
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