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GE Multilin
L60 Line Phase Comparison Relay
5-173
5 SETTINGS
5.6 CONTROL ELEMENTS
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 5–101: 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.
Using Digital Element 1 to monitor the breaker trip circuit, the settings will be:
DIGITAL ELEMENT 1
DIGITAL ELEMENT 1
FUNCTION: Enabled
MESSAGE
DIG ELEM 1 NAME:
Bkr Trip Cct Out
MESSAGE
DIG ELEM 1 INPUT:
Cont Op 1 VOff
MESSAGE
DIG ELEM 1 PICKUP
DELAY: 0.200
s
MESSAGE
DIG ELEM 1 RESET
DELAY: 0.100
s
MESSAGE
DIG ELEM 1 BLOCK:
Cont Ip 1 Off
MESSAGE
DIGITAL ELEMENT 1
TARGET: Self-reset
MESSAGE
DIGITAL ELEMENT 1
EVENTS: Enabled
Trip
Coil
52a
V
I
H1a
H1b
H1c
UR Relay - Form-A
V = Voltage Monitor
I = Current Monitor
DC+
DC–
827073A1.vsd
Содержание L60
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Страница 24: ...1 14 L60 Line Phase Comparison Relay GE Multilin 1 5 USING THE RELAY 1 GETTING STARTED 1...
Страница 42: ...2 18 L60 Line Phase Comparison Relay GE Multilin 2 2 SPECIFICATIONS 2 PRODUCT DESCRIPTION 2...
Страница 78: ...3 36 L60 Line Phase Comparison Relay GE Multilin 3 3 DIRECT INPUT OUTPUT COMMUNICATIONS 3 HARDWARE 3...
Страница 368: ...8 28 L60 Line Phase Comparison Relay GE Multilin 8 2 SINGLE POLE TRIPPING 8 THEORY OF OPERATION 8...
Страница 470: ...D 10 L60 Line Phase Comparison Relay GE Multilin D 1 PROTOCOL APPENDIXD D...
Страница 482: ...E 12 L60 Line Phase Comparison Relay GE Multilin E 2 DNP POINT LISTS APPENDIXE E...
Страница 498: ...x L60 Line Phase Comparison Relay GE Multilin INDEX Z ZERO SEQUENCE CORE BALANCE 3 9...