GE Power Management
ALPS Advanced Line Protection System
1-35
1 PRODUCT DESCRIPTION
1.8 PROTECTION SCHEMES
1
1.8.8 SINGLE PHASE TRIPPING
This section applies to the ALPS with single phase tripping model only.
a) PHASE SELECTION
When used in a single phase tripping application, the ALPS is designed so that only the faulted phase will be tripped for a
single line to ground fault, but all phases will be tripped for any multi-phase fault. To accomplish this goal, the ALPS
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 ALPS is shown in below for all logic
scheme except the Hybrid; the logic for the Hybrid scheme is shown in Figure 1–20: SINGLE PHASE TRIPPING LOGIC
(HYBRID SCHEME) on page 1–40.
Figure 1–19: 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
R I - 1 P 1
R I - 3 P 1
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
( S e t t i n g s 8 0 1 - 8 1 0 )
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
