2-2 L30 Line Current Differential System GE Multilin
2.1 INTRODUCTION 2 PRODUCT DESCRIPTION
2
Figure 2–1: SINGLE LINE DIAGRAM
50DD Current disturbance detector 59X Auxiliary overvoltage
50G Ground instantaneous overcurrent 67N Neutral directional overcurrent
50N Neutral instantaneous overcurrent 67P Phase directional overcurrent
50P Phase instantaneous overcurrent 79 Automatic recloser
50_2 Negative-sequence instantaneous overcurrent 81U Underfrequency
51G Ground time overcurrent 87L Segregated line current differential
51N Neutral time overcurrent 87LG Line ground current differential
Table 2–2: OTHER DEVICE FUNCTIONS
FUNCTION FUNCTION FUNCTION
Breaker arcing current (I
2
t) Fault locator and fault reporting Stub bus
Breaker control FlexElementsâ„¢ (8) Synchrophasor (PMU)
Contact inputs (up to 96) FlexLogic equations Time synchronization over IRIG-B or
IEEE 1588
Contact outputs (up to 64) IEC 60870-5-103 communications
(optional)
Time synchronization over SNTP
Control pushbuttons IEC 61850 communications (optional) Transducer inputs and outputs
CT failure detector Channel tests User-definable displays
CyberSentryâ„¢ security Metering:Current, voltage, power,
frequency, power factor, 87L current, local
and remote phasors
User-programmable LEDs
Data logger Modbus communications User-programmable pushbuttons
Digital counters (8) Modbus user map User-programmable self-tests
Digital elements (48) Non-volatile latches Virtual inputs (64)
Direct inputs (8 per pilot channel) Non-volatile selector switch Virtual outputs (96)
Disconnect switches Open pole detector VT fuse failure
DNP 3.0 or IEC 60870-5-104 protocol Oscillography
Table 2–1: ANSI DEVICE NUMBERS AND FUNCTIONS
DEVICE
NUMBER
FUNCTION DEVICE
NUMBER
FUNCTION
831815A4.CDR
L30 Line Differential Relay
52
Monitoring
CLOSE TRIP
Data from/to remote end
(via dedicated communications)
Metering+PMU
FlexElement
Transducer
inputs
50N87L
50BF
51_2
51P
50_2
79
50P
27P
27X
59X
59P
25
51G50G
67N67P
59_2
51N 49
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