CHAPTER 7: PROTECTION
PROTECTION FLEXLOGIC™
D90
PLUS
LINE DISTANCE PROTECTION SYSTEM – INSTRUCTION MANUAL
421
NEUTRAL TOC 2 to 6
..................................The operands listed above are also available for neutral time
overcurrent 2 through 6.
Neutral directional overcurrent operands
NTRL DIR OC1 FWD...................................Asserted when the neutral directional overcurrent 1 element
forward mode operates.
NTRL DIR OC1 REV.....................................Asserted when the neutral directional overcurrent 1 element
reverse mode operates.
NTRL DIR OC2 FWD...................................Asserted when the neutral directional overcurrent 2 element
forward mode operates.
NTRL DIR OC2 REV.....................................Asserted when the neutral directional overcurrent 2 element
reverse mode operates.
Open pole detector operands
OPEN POLE BKR
Φ
A OPEN......................Asserted when an open pole condition is detected on phase A,
based on breaker auxiliary contacts.
OPEN POLE BKR
Φ
B OPEN......................Asserted when an open pole condition is detected on phase B,
based on breaker auxiliary contacts.
OPEN POLE BKR
Φ
C OPEN .....................Asserted when an open pole condition is detected on phase C,
based on breaker auxiliary contacts.
OPEN POLE BLK AB....................................Asserted when the blocking signal for the AB phase distance
elements is established.
OPEN POLE BLK BC ...................................Asserted when the blocking signal for the BC phase distance
elements is established.
OPEN POLE BLK CA ...................................Asserted when the blocking signal for the CA phase distance
elements is been established.
OPEN POLE BLK N......................................Asserted when the blocking signal for the neutral, ground, and
negative-sequence overcurrent elements is established.
OPEN POLE OP.............................................Asserted when the open pole detector operates.
OPEN POLE OP
Φ
A.....................................Asserted when an open pole condition is detected in phase A.
OPEN POLE OP
Φ
B.....................................Asserted when an open pole condition is detected in phase B.
OPEN POLE OP
Φ
C.....................................Asserted when an open pole condition is detected in phase C.
OPEN POLE REM OP
Φ
A...........................Asserted when a remote open pole condition is detected in
phase A.
OPEN POLE REM OP
Φ
B...........................Asserted when a remote open pole condition is detected in
phase B.
OPEN POLE REM OP
Φ
C...........................Asserted when a remote open pole condition is detected in
phase C.
Phase directional overcurrent operands
PH DIR1 BLK .................................................Asserted when the phase directional overcurrent 1 element is
blocked.
PH DIR1 BLK A .............................................Asserted when the phase directional overcurrent 1 element is
blocked in phase A.
PH DIR1 BLK B .............................................Asserted when the phase directional overcurrent 1 element is
blocked in phase B.
PH DIR1 BLK C .............................................Asserted when the phase directional overcurrent 1 element is
blocked in phase C.
PH DIR 2
..........................................................Same set of operands as shown above for the phase directional
overcurrent 2 element.
Phase distance operands
PH DIST Z1 DPO AB ...................................Asserted when phase distance zone 1 phase AB drops out.
PH DIST Z1 DPO BC ...................................Asserted when phase distance zone 1 phase BC drops out.