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Negative-sequence overcurrent element application and coordination in distribution protection

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3 Author(s)
Elneweihi, A.F. ; British Columbia Hydro, Vancouver, BC, Canada ; Schweitzer, E.O., III ; Feltis, M.W.

Negative-sequence overcurrent elements do not respond to balanced load and can thus be set to operate faster and more sensitively than phase overcurrent elements for phase-to-phase faults. It is demonstrated that on a radial distribution system negative-sequence overcurrent elements need only be coordinated with downstream phase overcurrent devices for phase-to-phase faults. Coordination for other fault types is then achieved with no further analysis required. The effects of negative-sequence load current and open phase conductors on negative-sequence overcurrent elements are discussed.<>

Published in:

Power Delivery, IEEE Transactions on  (Volume:8 ,  Issue: 3 )

Date of Publication:

July 1993

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