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LPS-D Line Protection System
GE Power Management
1.5 OTHER FEATURES
1 PRODUCT DESCRIPTION
1
Figure 1–8: SWITCH SELECTION OF ACTIVE SETTING GROUP
1.5.11 TIME SYNCHRONIZATION
The LPS-D includes a clock that can run freely from the internal oscillator or be synchronized from an external
signal. An unmodulated IRIG-B signal connected to the IRIG-B terminals, located on terminal block “D” on the
rear panel, may be used to synchronize the clock. The clock in a given LPS-D is synchronized to within ±1 ms
of any other LPS-D clock if the two relays are wired to the same synchronizing signal.
1.5.12 TRIP BUS CHECK
After a settings change is made in the active settings group, the LPS-D automatically returns to its normal pro-
tection-on mode following:
•
Storage of the new setting values in nonvolatile memory.
•
A Trip Bus Check to determine that the changed settings have not caused any of the trip functions to oper-
ate for system conditions (that is, current and voltage at the relay) at that instant.
A Trip Bus Check also occurs before a newly selected settings group is allowed to become the active settings
group. If Trip Bus Check finds a picked-up trip function, protection is turned off and a critical alarm is issued.
This check provides a degree of confidence in the new settings, but it does not guarantee that one or more trip
functions might not operate as system conditions change. For example, a subsequent increase in load current
might cause the Zone 3 phase-distance function to operate, even though it did not operate at the instant the
Trip Bus Check was made.
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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 ...