TRANSIENTS COMPUTATION FOR RELAY TESTING IN REAL-TIME

This paper discusses characteristics of a new digital simulator for pr otection relay testing. The most demanding design requirement is compu tation of fault transients under the condition of real-time change of power system configuration due to relay operation. This problem is sol ved using EMTP computational techniques enhanced with novel numerical solutions for dynamic power system configuration change and nonlinear element modeling. An advanced computer architecture is utilized to ach ieve further optimization of the execution time for the transients com putation code. The main advantage of this design is the use of convent ional single processor computer architecture in combination with advan ced digital signal processors (DSPs). This makes this simulator an off -the-shelf product with all the benefits of commercially available com puters priced at a relatively low cost.