Time-domain modeling and validation of overcurrent/reclosing relay operation

The goal of this work is to develop and validate a time-domain simulation model which can emulate the reclosing capabilities of an overcurrent and reclosing relay. The model is capable of performing multiple reclosing shots and can be programmed to operate on standard TCC curves by specifying the desired equations. The duration of the reclose intervals can also be specified. The performance of the model is compared to the performance of the reclosing relay by simulating the same fault scenarios on each and comparing the resulting fault current waveforms. Specifically, the operating times of the time-overcurrent trip function and duration of the reclose intervals are compared. The operating times are also compared with the theoretical values from the TCC curve equations. The accuracy of the reclosing relay model is compared to the actual relay for similar fault scenarios. The results show that both the model and the reclosing relay operate close to the expected theoretical values.