GE L90 Instruction Manual page 26

2.1 INTRODUCTION
Table 2–1: DEVICE NUMBERS AND FUNCTIONS
DEVICE FUNCTION
NUMBER
21G Ground Distance
21P Phase Distance
25 Synchrocheck
2
27P Phase Undervoltage
27X Auxiliary Undervoltage
50BF Breaker Failure
50DD Adaptive Fault Detector
(sensitive current disturbance detector)
50G Ground Instantaneous Overcurrent
50N Neutral Instantaneous Overcurrent
50P Phase Instantaneous Overcurrent
50_2 Negative Sequence Instantaneous Overcurrent
51G Ground Time Overcurrent
51N Neutral Time Overcurrent
52
Monitoring
50DD
L90
2-2
79
CLOSE
50_2(2) 51_2(2)
50P(2) 51P(2) 50BF(2)
Data From/To Remote End
(via Dedicated Communications)
Line Differential Relay
Figure 2–1: SINGLE LINE DIAGRAM
L90 Line Differential Relay
DEVICE FUNCTION
NUMBER
51P Phase Time Overcurrent
51_2 Negative Sequence Time Overcurrent
52 AC Circuit Breaker
59N Neutral Overvoltage
59P Phase Overvoltage
59X Auxiliary Overvoltage
67N Neutral Directional Overcurrent
67P Phase Directional Overcurrent
67_2 Negative Sequence Directional Overcurrent
68 Power Swing Blocking
78 Out-of-Step Tripping
79 Automatic Recloser
87L Segregated Line Current Differential
TRIP
67P(2) 78
87L 21P 68
TM
FlexElement
50G(2) 51G(2)
2 PRODUCT DESCRIPTION
3V_0
50N(2) 51N(2)
67N/G
Transducer
Metering
Inputs
59P
27P(2)
59N
59X 27X
25(2)
21G
831706AS.CDR
GE Multilin