GE LPS-D, Instruction Manual, Page: 57 / 436

GE Power Management LPS-D Line Protection System 1-
39
1 PRODUCT DESCRIPTION 1.9 SINGLE PHASE TRIPPING
1
1.9 SINGLE PHASE TRIPPING 1.9.1 PHASE SELECTION
This section applies to the LPS-D with Single Phase Tripping only.
When used in a single phase tripping application, the LPS-D is designed so that only the faulted phase is
tripped for a single line-to-ground fault, but all phases will be tripped for any multi-phase fault. To accomplish
this goal, the LPS-D includes a faulted phase determination algorithm. This algorithm uses a combination of
distance measuring functions and current-only faulted phase selection algorithms to select the fault type. The
output of this algorithm, along with other logic, determines which trip outputs are energized for each fault. The
trip output logic for the LPS-D is shown below for all logic schemes except the Hybrid; the trip output logic for
the Hybrid scheme is shown in Figure 1–19: SINGLE PHASE TRIPPING LOGIC (HYBRID SCHEME).
Figure 1–18: SINGLE-PHASE TRIPPING LOGIC (EXCEPT FOR HYBRID SCHEME)
NOTE
FAULTED
PHASE
SELECTION
LOGIC
MULTI-PHASE
P H A S E A
P H A S E C
P H A S E B
O P E N - P O L E L O G I C
C C
E X T E R N A L 3 P O L E T R I P E N A B L E
3 POLE TRIP ENABLE FLAG (from internal recloser)
3 POLE TRIP MODE FLAG (Setting 1203)
F A U L T
D E T E C T O R
IT OVER-
CURRENT
P H A S E A
P H A S E C
P H A S E B
T R I P
P H A S E C
RI-1P1
RI-3P1
T R I P B U S
( F R O M O R 4 4 )
A N Y P H A S E
T R I P
T R I P
P H A S E B
T R I P
P H A S E A
2 O R 3
P H A S E
T R I P
2 OR 3
LOGIC
2 O R 3 P H A S E T R I P
A N Y P H A S E
T R I P
R E C L O S E C A N C E L
(Settings 801-810)
S E L E C T T H R E E P H A S E T R I P
ANY TIME DELAYED TRIP
(Any Zone Timer or TOC)
L I N E P I C K U P
C O N F I G U R A B L E T R I P
T R I P B U S S E A L - I N
T R I P B U S S E A L - I N
T R I P B U S S E A L - I N
N O P H A S E
S E L E C T E D
1 P - T R I P . V S D
3 0
3 9
3 6
3 2
3 7
3 3
3 8
3 4
3 1
4 0
4 1
4 3
3 9