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1.8 PROTECTION SCHEME DESCRIPTIONS
1
CC
(RCVR1)
21
CC
(RCVR2)
P H A S E
D I S T A N C E
110
G R O U N D
D I S T A N C E
G R O U N D
T R I P
D I R E C T I O N A L
O V E R -
B L O C K
C U R R E N T
R E M O T E
O P E N
P H A S E
D I S T A N C E
1
G R O U N D
D I S T A N C E
TL3P
C
P H A S E
D I S T A N C E
0
TL3G
C
G R O U N D
D I S T A N C E
D
P H A S E
D I S T A N C E
TL4P
TL4G
D
G R O U N D
D I S T A N C E
P H A S E
5 0 P
B A C K U P
50G
G R O U N D
B A C K U P
51G
L I N E P I C K U P
F A U L T
D E T E C T O R
IT
O V E R -
C U R R E N T
S U P E R V I S I O N
IB
P T F U S E
F A I L U R E
D E T E C T I O N
L O G I C
O U T O F S T E P
B L O C K I N G
L O G I C
The ground-directional overcurrent (GDOC) transient blocking logic consists of TL24, OR508, AND301, and
OR302. After an external fault, the GDOC blocking function starts the carrier and applies a blocking input to the
comparator. If the external fault persists for 25 ms, TL24 produces an output. At this point the GDOC blocking
function is set up with an extended dropout time so that the carrier is maintained and tripping is blocked at the
comparator for at least 30 ms following the clearing of the external fault.
The ground-distance and phase-distance transient blocking logic consists of OR20, AND503, TL25, and
OR302. It operates in a similar manner to the GDOC transient blocking logic. Thus, if any of the overreaching
zone tripping functions operate as a result of a current reversal or a fault-clearing transient, tripping is initiated
1-
34
Setting
1202
[ 1 R C V R ]
3
CARRIER START
[ 2 R C V R S ]
B = 0.2- 3.0 SEC
T2LP
B
0
REF
Setting
2 0 5
2
407
R E F
B
25
0
TL2G
(Zone 2)
X = 30 - 300
8
103
2
103
25
BLOCK ZONE 1
Setting 110
(Zone 3)
T I M E D E L A Y E D T R I P
11
0
C = 0.4 - 6 sec
0
(Zone 4)
12
0
D = 0.4 - 6 sec
28
Supervise Zone 4
FFB
Setting 714
OSB
B L O C K S S E L E C T E D P H A S E A N D
G R O U N D Z O N E F U N C T I O N S
Settings
D U R I N G O U T O F S T E P
1601 - 1607
C O N D I T I O N
Figure 1–14: BLOCKING SCHEME LOGIC DIAGRAM
LPS-D Line Protection System
EXTERNAL
C C
( S T C R )
EXTERNAL
C C
BLOCK PILOT
( S T C R )
TRIPPING
F = 1 - 50
TL1
F
3
50
4
508
X
TL24
301
303
302
BLOCK ZONE 1
OSBALL
13
FFB
Setting 714
TL25
P
503
20
X
X = 30 - 300
9
9
BLOCK RELCLOSING
Settings 801-810
1 PRODUCT DESCRIPTION
FFB
Setting 714
3
CARRIER
208
(KEY1)
START
22
CARRIER
213
(KEY2)
209
STOP
O S B
Setting 110
13
(CNFTRP)
CONFIGURABLE
TRIP BUS
7
7
6
8
(RI)
RECLOSE INITIATE
(CANCL)
RECLOSE CANCEL
BlockScheme.vsd
GE Power Management
44
(TRIP)
TRIP
BUS
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