Effect of instantaneous overcurrent functions on optimal coordination of directional overcurrent protections Articles uri icon

publication date

  • May 2025

issue

  • 111352

volume

  • 241

International Standard Serial Number (ISSN)

  • 0378-7796

Electronic International Standard Serial Number (EISSN)

  • 1873-2046

abstract

  • This short article shows that the inclusion of Instantaneous Directional Over-Current Protections (IDOCP) on Optimal Coordination of Directional Over-Current Protections (OC-DOCP) can improve the speed of Time-Delay Directional Over-Current Protections (TDDOCP). The selectivity constraints must be modified to consider that backup TDDOCP must be slower than main IDOCP for currents greater than main IDOCP pickup, and also must be slower than main TDDOCP for currents smaller than main IDOCP pickup. The numerical examples show speed improvements for different types of time-overcurrent curves.

subjects

  • Electronics

keywords

  • directional overcurrent protection