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LPS-D Line Protection System
GE Power Management
2.3 PROTECTION SETTINGS
2 CALCULATION OF SETTINGS
2
If charging current is initially detected but the fault detector (FD) is not picked up, indicating no fault on the
power system, then OR1 and AND1 produce outputs. AND2 produces an output and seals itself in on the out-
put of OR1 via OR2. AND3 is now blocked from producing an output as long as charging current is detected,
regardless of whether FD is picked up or not. If a subsequent fault occurs and the remote breaker opens, ROD
is prevented from producing an output.
If sufficient load current is flowing prior to the fault, there is no output from OR1, indicating that no charging cur-
rent is detected, and AND3 is not blocked, since there is no output from AND2. If an unbalanced fault subse-
quently occurs, FD blocks AND1 to prevent an AND2 output. AND3 is allowed to produce an output when the
remote breaker opens, provided there is sufficient charging current to operate one or more of the three charg-
ing-current-detectors that are the inputs to OR1. The capacitive charging current must be 60 milliamperes or
more (secondary phase current) to assure operation of ROD. If the fault is still present, as indicated by an out-
put from OR3, a ROD trip is initiated following TL20 security time delay setting.
1001: REMOTEOPEN - Select Remote Open Detector
Set REMOTEOPEN = YES if the remote open detection function is to be used, otherwise set REMOTEOPEN
= NO.
1002: TL20PICKUP - Remote Open Detector Time Delay
TL20PICKUP the time required for a remote open trip to be initiated following opening of the remote breaker
and subsequent detection of charging current flow. Longer settings will provide greater security but slower trip-
ping and vice versa. Use a TL20PICKUP setting that meets the specific application.
2.3.12 LINEOVRLD
The Line Overload function consists of two overcurrent units, Level 1 and Level 2, with independent time
delays. Level 1 is intended to be used with the lower pickup and longer time delay. Level 2 is intended to be
used with the higher pickup and shorter time delay. The pickup and time delay settings should be based on
short time and emergency loading situations for the protected line.
1101: LINEOVERLD - Select Line Overload Protection
Set LINEOVERLD = YES if line overload protection is to be used, otherwise set LINEOVERLD = NO. If LINE-
OVERLD = NO, ignore Protection Settings 1102 to 1105.
1102: LEVEL1PU - Level 1 Pickup Current
Use a LEVEL1PU setting that meets the specific application.
1103: LEVEL2PU - Level 2 Pickup Current
Use a LEVEL2PU setting that meets the specific application.
1104: LEVEL1TDLY - Level 1 Time Delay
Use a LEVEL1TDLY setting that meets the specific application.
1105: LEVEL2TDLY - Level 2 Time Delay
Use a LEVEL2TDLY setting that meets the specific application.
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Страница 164: ...3 14 LPS D Line Protection System GE Power Management 3 3 PRINTED CIRCUIT BOARD MODULES 3 HARDWARE DESCRIPTION 3 ...
Страница 226: ...7 4 LPS D Line Protection System GE Power Management 7 1 RATINGS 7 SPECIFICATIONS 7 ...
Страница 284: ...10 20 LPS D Line Protection System GE Power Management 10 8 HELP MENU 10 ALPS TEST PROGRAM 10 ...
Страница 334: ...A 4 LPS D Line Protection System GE Power Management A 1 FREQUENTLY ASKED QUESTIONS APPENDIXA A ...
Страница 412: ...C 34 LPS D Line Protection System GE Power Management C 3 POINT LISTS APPENDIXC C ...
Страница 416: ...D 4 LPS D Line Protection System GE Power Management D 1 KEYPAD MENUS APPENDIXD D ...
Страница 422: ...F 2 LPS D Line Protection System GE Power Management F 1 WARRANTY INFORMATION APPENDIXF F ...
Страница 435: ...GE Power Management LPS D Line Protection System xiii INDEX INDEX tests 6 11 ZONE TIMER functional tests 5 10 ...
Страница 436: ...xiv LPS D Line Protection System GE Power Management INDEX INDEX ...