CHAPTER 7: PROTECTION
PROTECTION FLEXLOGIC™
D90
PLUS
LINE DISTANCE PROTECTION SYSTEM – INSTRUCTION MANUAL
419
HYBRID POTT TRIP A .................................Asserted when the hybrid permissive overreaching transfer trip
scheme operates to trip phase A.
HYBRID POTT TRIP B .................................Asserted when the hybrid permissive overreaching transfer trip
scheme operates to trip phase B.
HYBRID POTT TRIP C .................................Asserted when the hybrid permissive overreaching transfer trip
scheme operates to trip phase C.
HYBRID POTT TRIP 3P...............................Asserted when the hybrid permissive overreaching transfer trip
scheme operates to trip all three phases.
HYBRID POTT TX1.......................................Asserted when the hybrid permissive overreaching transfer trip
scheme asserts transmit bit 1.
HYBRID POTT TX2.......................................Asserted when the hybrid permissive overreaching transfer trip
scheme asserts transmit bit 2.
HYBRID POTT TX3.......................................Asserted when the hybrid permissive overreaching transfer trip
scheme asserts transmit bit 3.
HYBRID POTT TX4.......................................Asserted when the hybrid permissive overreaching transfer trip
scheme asserts transmit bit 4.
Non-volatile latch operands
LATCH 1 OFF.................................................Asserted when non-volatile latch 1 is off (logic 0).
LATCH 1 ON...................................................Asserted when non-volatile latch 1 is on (logic 1).
LATCH 2 to 16
...............................................The operands listed above are also available for non-volatile
latches 2 to 16.
Line pickup operands
LINE PICKUP DPO.......................................Asserted when the line pickup element drops out.
LINE PICKUP I<A..........................................Asserted when the line pickup element detects phase A current
less than 5% of nominal.
LINE PICKUP I<B..........................................Asserted when the line pickup element detects phase B current
less than 5% of nominal.
LINE PICKUP I<C..........................................Asserted when the line pickup element detects phase C current
less than 5% of nominal.
LINE PICKUP LEO PKP...............................Asserted when the line pickup element line end open feature
picks up.
LINE PICKUP OP ..........................................Asserted when the line pickup element operates.
LINE PICKUP PKP........................................Asserted when the line pickup element picks up.
LINE PICKUP RCL TRIP..............................Asserted when the line pickup element operates from
overreaching zone 2 when reclosing the line (zone 1 extension
functionality).
LINE PICKUP UV PKP.................................Asserted when the line pickup undervoltage protection picks
up.
Load encroachment operands
LOAD ENCRO DPO .....................................Asserted when the load encroachment element picks up.
LOAD ENCRO OP.........................................Asserted when the load encroachment element operates.
LOAD ENCRO PKP.......................................Asserted when the load encroachment element drops out.
Negative-sequence directional overcurrent operands
NEG SEQ DIR OC1 FWD...........................Asserted when the negative-sequence directional overcurrent
1 element forward mode operates.
NEG SEQ DIR OC1 REV.............................Asserted when the negative-sequence directional overcurrent
1 element reverse mode operates.
NEG SEQ DIR OC2 FWD...........................Asserted when the negative-sequence directional overcurrent
2 element forward mode operates.
