GE D60 Instruction Manual page 352

5.7 CONTROL ELEMENTS 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 will be delayed by
TRIP DELAY ON EVOLV
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: This setting should be used in conjunction with the setting (see
REVERSE FAULT
above). Typically this value should be set around half a power system cycle. 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 accuracy of single-pole tripping.
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5-218 D60 Line Distance Protection System GE Multilin