GE ALPS Instruction Manual page 48

1.8 PROTECTION SCHEMES
1
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
In the Hybrid scheme trip output logic, the phase selection algorithm is supplemented with under voltage detectors in the
case of a weak infeed trip in which there is insufficient current to operate either the ground distance functions or the current
only phase selection function.
b) OPEN POLE DETERMINATION
The ALPS includes logic to detect when one or more poles of the circuit breaker is open. This logic is depicted in Figure 1–
21: OPEN POLE DETECTION LOGIC on page 1–41. The logic uses a combination of current and voltage detectors and
breaker auxiliary contacts. The breaker auxiliary contacts (52/b) are not required for the relay to function correctly. The
Open Pole logic detects when any pole is open, when only one pole is open, and when all three poles are open.
1-36
SELECT THREE PHASE TRIP
30
39
R E C L O S E C A N C E L
(Settings 801-810)
Figure 1–20: SINGLE PHASE TRIPPING LOGIC (HYBRID SCHEME)
ALPS Advanced Line Protection System
TRIP BUS SEAL-IN
36
32
TRIP BUS SEAL-IN
37
33
TRIP BUS SEAL-IN
38
34
A N Y
PHASE TRIP
39
1 PRODUCT DESCRIPTION
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
2 OR 3
LOGIC
PHASE
40 RI-3P1
43
41 RI-1P1
GE Power Management
TRIP