Performance of modern fault passage indicator concept in compensated MV-networks

摘要

This paper introduces a novel concept for fault passage indication applicable in secondary distribution level in compensated MV-networks. A special emphasis is put to dependable and secure detection of all kind of earth faults encountered in practical networks with overhead lines and underground cables. With the proposed solution requirements for sensitivity and selectivity are fulfilled not only in continuous solid and resistive earth faults, but also during restriking faults. The operation of the fault passage indication is based on the latest evolution of the neutral admittance based detection principle utilizing multifrequency admittance measurement. The performance of the proposed novel fault indication concept has been validated by a field test in a 20kV distribution network. The results show that the multifrequency admittance criterion provides very good overall performance and has thus a high potential to become a standard and widely used functionality in fault passage indication applications.