1-
34
LPS-D Line Protection System
GE Power Management
1.8 PROTECTION SCHEME DESCRIPTIONS
1 PRODUCT DESCRIPTION
1
Figure 1–14: BLOCKING SCHEME LOGIC DIAGRAM
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
F A U L T
D E T E C T O R
L I N E P I C K U P
(CANCL)
(RI)
3
4
F = 1 - 50
TL1
F
50
25
X
B
0
3
407
3
8
301
508
302
209
22
213
208
CARRIER
START
CARRIER
STOP
O S B
(Zone 2)
TL24
2
[ 2 R C V R S ]
[ 1 R C V R ]
21
CC
(RCVR1)
CC
(RCVR2)
TL2G
B
0
REF
R E F
B = 0.2- 3.0 SEC
C C
( S T C R )
P H A S E
D I S T A N C E
G R O U N D
D I S T A N C E
G R O U N D
D I R E C T I O N A L
O V E R -
C U R R E N T
T R I P
B L O C K
R E M O T E
O P E N
P H A S E
D I S T A N C E
G R O U N D
D I S T A N C E
110
G R O U N D
B A C K U P
O V E R -
C U R R E N T
S U P E R V I S I O N
P H A S E
D I S T A N C E
G R O U N D
D I S T A N C E
P H A S E
D I S T A N C E
G R O U N D
D I S T A N C E
P H A S E
B A C K U P
5 0 P
P
X
TL25
X = 30 - 300
OSBALL
FFB
Setting 714
C
0
C
0
D
0
D
0
TL4G
TL4P
TL3G
TL3P
13
503
20
28
12
BLOCK ZONE 1
Setting 110
1
103
2
25
11
C = 0.4 - 6 sec
D = 0.4 - 6 sec
(Zone 4)
( Z o n e 3 )
T I M E D E L A Y E D T R I P
REVERSIBLE
ZONE 4
ZONE 3
ZONE 1
OVERREACHING ZONE /
ZONE 2
13
Setting
1202
EXTERNAL
CARRIER START
EXTERNAL
BLOCK PILOT
TRIPPING
(KEY1)
(KEY2)
S e t t i n g
2 0 5
BlockScheme.vsd
O U T O F S T E P
B L O C K I N G
L O G I C
OSB
Settings
1601 - 1607
(CNFTRP)
CONFIGURABLE
TRIP BUS
8
RECLOSE CANCEL
RECLOSE INITIATE
BLOCK RELCLOSING
Settings 801-810
9
(TRIP)
TRIP
BUS
44
7
7
6
303
103
BLOCK ZONE 1
Setting 110
Supervise Zone 4
FFB
Setting 714
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
FFB
Setting 714
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
D U R I N G O U T O F S T E P
C O N D I T I O N
X = 30 - 300
T2LP
C C
( S T C R )
51G
50G
IT
IB
9
Summary of Contents for LPS-D
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Page 226: ...7 4 LPS D Line Protection System GE Power Management 7 1 RATINGS 7 SPECIFICATIONS 7 ...
Page 284: ...10 20 LPS D Line Protection System GE Power Management 10 8 HELP MENU 10 ALPS TEST PROGRAM 10 ...
Page 412: ...C 34 LPS D Line Protection System GE Power Management C 3 POINT LISTS APPENDIXC C ...
Page 416: ...D 4 LPS D Line Protection System GE Power Management D 1 KEYPAD MENUS APPENDIXD D ...
Page 422: ...F 2 LPS D Line Protection System GE Power Management F 1 WARRANTY INFORMATION APPENDIXF F ...
Page 436: ...xiv LPS D Line Protection System GE Power Management INDEX INDEX ...