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1.9 SINGLE PHASE TRIPPING
In the Hybrid scheme trip output logic, the phase selection algorithm is supplemented with undervoltage detec-
tors in the case of a weak infeed trip in which there is insufficient current to operate either the ground distance
1
functions or the current-only phase selection function.
2 OR 3 PHASE TRIP
O P E N - P O L E L O G I C
E X T E R N A L
3 POLE TRIP
C C
E N A B L E
3 POLE TRIP ENABLE FLAG
(from internal recloser)
3 POLE TRIP MODE FLAG
(Setting 1203)
ANY TIME DELAYED TRIP (Any Zone Timer or TOC)
LINE PICKUP
C O N F I G U R A B L E T R I P
MULTI-PHASE
FAULTED
P H A S E A
PHASE
P H A S E B
SELECTION
P H A S E C
LOGIC
NO PHASE
SELECTED
P H A S E A
IT OVER-
P H A S E B
CURRENT
P H A S E C
F A U L T
D E T E C T O R
PHASE A
UNDERVOLTAGE
PHASE B
UNDERVOLTAGE
TRIP BUS
(FROM OR44)
WEAK INFEED TRIP
PERMISSION
(FROM TL16)
PHASE C
UNDERVOLTAGE
1P-TRIPH.VSD
Figure 1–19: SINGLE PHASE TRIPPING LOGIC (HYBRID SCHEME)
The LPS-D includes logic to detect when one or more poles of the circuit breaker is open. This logic is depicted
in Figure 1–20: OPEN POLE DETECTION LOGIC. The logic uses a combination of current and voltage detec-
tors and breaker auxiliary contacts. The breaker auxiliary contacts (52/b) are not required for the relay to func-
tion correctly. The Open Pole logic detects when any pole is open, when only one pole is open, and when all
three poles are open.
1-
40
SELECT THREE PHASE TRIP
30
39
A N Y
PHASE TRIP
R E C L O S E C A N C E L
(Settings 801-810)
LPS-D Line Protection System
1 PRODUCT DESCRIPTION
TRIP BUS SEAL-IN
36
32
TRIP BUS SEAL-IN
37
33
TRIP BUS SEAL-IN
38
34
2 OR 3
LOGIC
39
43
1.9.2 OPEN POLE DETERMINATION
GE Power Management
TRIP
P H A S E A
TRIP
P H A S E B
TRIP
P H A S E C
A N Y P H A S E
31
TRIP
2 OR 3
PHASE
TRIP
40
RI-3P1
41
RI-1P1
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