5-136
F35 Multiple Feeder Protection System
GE Multilin
5.6 CONTROL ELEMENTS
5 SETTINGS
5
As long as the current through the voltage monitor is above a threshold (see technical specifications for form-A), the Flex-
Logic™ operand “Cont Op # VOn” will be set (# represents the output contact number). If the output circuit has a high resis-
tance or the DC current is interrupted, the trickle current will drop below the threshold and the FlexLogic™ operand “Cont
Op # VOff” will be set. Consequently, the state of these operands can be used as indicators of the integrity of the circuits in
which Form-A contacts are inserted.
EXAMPLE 1: BREAKER TRIP CIRCUIT INTEGRITY MONITORING
In many applications it is desired to monitor the breaker trip circuit integrity so problems can be detected before a trip oper-
ation is required. The circuit is considered to be healthy when the voltage monitor connected across the trip output contact
detects a low level of current, well below the operating current of the breaker trip coil. If the circuit presents a high resis-
tance, the trickle current will fall below the monitor threshold and an alarm would be declared.
In most breaker control circuits, the trip coil is connected in series with a breaker auxiliary contact which is open when the
breaker is open (see diagram below). To prevent unwanted alarms in this situation, the trip circuit monitoring logic must
include the breaker position.
Figure 5–67: TRIP CIRCUIT EXAMPLE 1
Assume the output contact H1 is a trip contact. Using the contact output settings, this output will be given an ID name, e.g.
“Cont Op 1". Assume a 52a breaker auxiliary contact is connected to contact input H7a to monitor breaker status. Using the
contact input settings, this input will be given an ID name, e.g. “Cont Ip 1" and will be set “On” when the breaker is closed.
The settings to use digital element 1 to monitor the breaker trip circuit are indicated below (EnerVista UR Setup example
shown):
The
PICKUP DELAY
setting should be greater than the operating time of the breaker to avoid nuisance
alarms.
Trip
Coil
52a
V
I
H1a
H1b
H1c
UR Relay - Form-A
V = Voltage Monitor
I = Current Monitor
DC+
DC–
827073A1.vsd
NOTE
Содержание F35
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Страница 30: ...1 20 F35 Multiple Feeder Protection System GE Multilin 1 5 USING THE RELAY 1 GETTING STARTED 1 ...
Страница 122: ...4 30 F35 Multiple Feeder Protection System GE Multilin 4 3 FACEPLATE INTERFACE 4 HUMAN INTERFACES 4 ...
Страница 296: ...5 174 F35 Multiple Feeder Protection System GE Multilin 5 9 TESTING 5 SETTINGS 5 ...
Страница 328: ...7 8 F35 Multiple Feeder Protection System GE Multilin 7 2 TARGETS 7 COMMANDS AND TARGETS 7 ...
Страница 332: ...8 4 F35 Multiple Feeder Protection System GE Multilin 8 1 FAULT LOCATOR 8 THEORY OF OPERATION 8 ...
Страница 350: ...A 16 F35 Multiple Feeder Protection System GE Multilin A 1 PARAMETER LIST APPENDIXA A ...
Страница 422: ...B 72 F35 Multiple Feeder Protection System GE Multilin B 4 MEMORY MAPPING APPENDIXB B ...
Страница 460: ...D 10 F35 Multiple Feeder Protection System GE Multilin D 1 IEC 60870 5 104 PROTOCOL APPENDIXD D ...
Страница 472: ...E 12 F35 Multiple Feeder Protection System GE Multilin E 2 DNP POINT LISTS APPENDIXE E ...