F.8
SEL-351A Relay Instruction Manual Date Code 20080213
Setting Negative-Sequence Overcurrent Elements
Other Negative-Sequence Overcurrent Element References
Other Negative-Sequence Overcurrent Element
References
A. F. Elneweihi, E. O. Schweitzer, M. W. Feltis, “Negative-Sequence
Overcurrent Element Application and Coordination in Distribution
Protection,” IEEE Transactions on Power Delivery, Volume 8, Number 3,
July 1993, pp. 915–924.
This IEEE paper is the source of the coordination guidelines and example
given in this appendix. The paper also contains analyses of system
unbalances and faults and the negative-sequence current generated by
such conditions.
A. F. Elneweihi, “Useful Applications for Negative-Sequence Overcurrent
Relaying,” 22nd Annual Western Protective Relay Conference, Spokane,
Washington, October 24–26, 1995.
This conference paper gives many good application examples for
negative-sequence overcurrent elements. The focus is on the transmission
system, where negative-sequence overcurrent elements provide better
sensitivity than zero-sequence overcurrent elements in detecting some
single-line-to-ground faults.
Courtesy of NationalSwitchgear.com
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