F-2 Setting Negative-Sequence Overcurrent Elements Date Code 990215
SEL-351P Manual Técnico
To avoid having negative-sequence time-overcurrent element 51QT with such low time-dial
settings trip for this transient negative-sequence current condition, make corresponding minimum
response time setting:
51QMR = 1.50 cycles (minimum response time; transient condition lasts
less than 1.5 cycles)
Figure APPENDIX F: .1: Minimum Response Time Added to a
Negative-Sequence Time-Overcurrent Element 51QT
Continue reading in Coordinating Negative-Sequence Overcurrent Elements in this appendix
for guidelines on coordinating negative-sequence time-overcurrent elements and a following
coordination example.
C
OORDINATING
N
EGATIVE
-S
EQUENCE
O
VERCURRENT
E
LEMENTS
The following coordination guidelines and example assume that the negative-sequence
overcurrent elements operate on 3I
2
magnitude negative-sequence current and that the power
system is radial. The negative-sequence overcurrent elements in the SEL-351P Recloser Control
operate on 3I
2
magnitude negative-sequence current.
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