CHAPTER 7: PROTECTION
PROTECTION FLEXLOGIC™
D90
PLUS
LINE DISTANCE PROTECTION SYSTEM – INSTRUCTION MANUAL
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POTT TRIP C ..................................................Asserted when the permissive over-reaching transfer trip
scheme operates to trip phase C.
POTT TX...........................................................Asserted when the permissive signal is sent.
POTT TX1........................................................Asserted when the permissive over-reaching transfer trip
scheme asserts transit bit number 1.
POTT TX2........................................................Asserted when the permissive over-reaching transfer trip
scheme asserts transit bit number 2.
POTT TX3........................................................Asserted when the permissive over-reaching transfer trip
scheme asserts transit bit number 3.
POTT TX4........................................................Asserted when the permissive over-reaching transfer trip
scheme asserts transit bit number 4.
Power swing detection operands
POWER SWING 50DD...............................Asserted when the power swing detection element detects a
disturbance other than a power swing.
POWER SWING BLOCK ............................Asserted when the power swing detection blocking element
operates.
POWER SWING INCOMING....................Asserted when an unstable power swing is detected (incoming
locus).
POWER SWING INNER .............................Asserted when the positive-sequence impedance is in the inner
characteristic.
POWER SWING MIDDLE..........................Asserted when the positive-sequence impedance is in the
middle characteristic.
POWER SWING OUTER ............................Asserted when the positive-sequence impedance is in the outer
characteristic.
POWER SWING OUTGOING ...................Asserted when an unstable power swing is detected (outgoing
locus).
POWER SWING TMR1 PKP......................Asserted when power swing timer 1 picks up.
POWER SWING TMR2 PKP......................Asserted when power swing timer 2 picks up.
POWER SWING TMR3 PKP......................Asserted when power swing timer 3 picks up.
POWER SWING TMR4 PKP......................Asserted when power swing timer 4 picks up.
POWER SWING UN/BLOCK....................Asserted when the out-of-step tripping function operates.
Permissive underreach transfer trip (PUTT scheme) operands
PUTT OP..........................................................Asserted when power permissive under-reaching transfer trip
scheme operates.
PUTT TRIP 3P................................................Asserted when power permissive under-reaching transfer trip
scheme operates to trip all three phases.
PUTT TRIP A...................................................Asserted when power permissive under-reaching transfer trip
scheme operates to trip phase A.
PUTT TRIP B...................................................Asserted when power permissive under-reaching transfer trip
scheme operates to trip phase B.
PUTT TRIP C...................................................Asserted when power permissive under-reaching transfer trip
scheme operates to trip phase C.
PUTT TX1........................................................Asserted when power permissive under-reaching transfer trip
scheme asserts transit bit number 1.
PUTT TX2........................................................Asserted when power permissive under-reaching transfer trip
scheme asserts transit bit number 2.
PUTT TX3........................................................Asserted when power permissive under-reaching transfer trip
scheme asserts transit bit number 3.
PUTT TX4........................................................Asserted when power permissive under-reaching transfer trip
scheme asserts transit bit number 4.