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Computer prediction of IDMT relay settings and performance for interconnected power systems

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2 Author(s)
J. P. Whiting ; East Midlands Electricity Board, Nottingham, UK ; D. Lidgate

The application of the inverse definite minimum time (IDMT) overcurrent relay to power system protection is reviewed, and the present methods for determining its settings are briefly described. A computer program to calculate relay settings based on a generalised procedure, and therefore suitable for both radial and interconnected ring systems, is then proposed. Its application to a specific interconnected system is explained. Two further programs have been developed to be used in conjunction with the first one. These assess, by a simulated circuit breaker tripping facility, how the IDMT protection would perform on an interconnected ring power system when there occurs either a failure of the main protection or a circuit breaker on the faulted section.

Published in:

IEE Proceedings C - Generation, Transmission and Distribution  (Volume:130 ,  Issue: 3 )