GE D60 Instruction Manual page 385

5 SETTINGS
spurious three-pole operation on a single-line-to-ground internal fault. Delaying tripping on internal faults that follow
detection of reverse faults solves the problem.
As long as the operand indicated under this setting is asserted the trip action is delayed by
time. Typically this operand should combine reverse zone indications (such as zone 4 pickup) with a half-cycle
FAULTS
pickup delay, and two-cycle dropout delay. This setting should be used only in single-pole tripping applications, when
evolving faults are of importance, and slightly delayed operation on evolving faults could be traded for enhanced accu-
racy of single-pole tripping.
• TRIP DELAY ON EVOLV FAULTS: Use this setting in conjunction with the
cally this value is set around half a power system cycle. Use it only in single-pole tripping applications, when evolving
faults are of importance, and slightly delayed operation on evolving faults could be traded for enhanced accuracy of
single-pole tripping.
GE Multilin D60 Line Distance Protection System
5.7 CONTROL ELEMENTS
TRIP DELAY ON EVOLV
setting (see above). Typi-
REVERSE FAULT
5
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