GE Multilin 745

Introduction745
Transformer Management Relay
Overview
http://www.GEindustrial.com/multilin
2–2
GE Multilin
Protection Features The following table outlines the protection features available for Windings 1, 2, and
3, as well as the common protection elements.
Symbol Common Protection Element Symbol Winding 1 Protection Elements
59/81-1 Volts-Per-Hertz 1 150/46 Negative Sequence Instantaneous
Overcurrent
59/81-2 Volts-Per-Hertz 2 151/46 Negative Sequence Time Overcurrent
81U-1 Underfrequency 1 150P1 Phase Instantaneous Overcurrent 1
81U-2 Underfrequency 2 150P2 Phase Instantaneous Overcurrent 2
81U-R1 Frequency Decay Rate 1 150N1 Neutral (3I
0
) Instantaneous Overcurrent 1
81U-R2 Frequency Decay Rate 2 150N2 Neutral (3I
0
) Instantaneous Overcurrent 2
81U-R3 Frequency Decay Rate 3 150G1 Ground Instantaneous Overcurrent 1
81U-R4 Frequency Decay Rate 4 150G2 Ground Instantaneous Overcurrent 2
81-H5 5th Harmonic Level 151P Phase Time Overcurrent
81O Overfrequency 151N Neutral (3I
0
) Time Overcurrent
87 Differential (Percent) 151G Ground Time Overcurrent
50/87 Instantaneous Differential 187TG Ground Differential (Restricted Ground
Fault)
AN-1 Analog Input Level 1 1THD Total Harmonic Distortion Level
AN-2 Analog Input Level 2 1AD Current Demand
Insulation Aging: Aging Factor, Hottest
Spot Limit, and Total Accumulated Life
Tap Changer Monitor
Symbol Winding 2 Protection Element Symbol Winding 3 Protection Elements
250/46 Negative Sequence Instantaneous
Overcurrent
350/46 Negative Sequence Instantaneous
Overcurrent
251/46 Negative Sequence Time Overcurrent 351/46 Negative Sequence Time Overcurrent
250P1 Phase Instantaneous Overcurrent 1 350P1 Phase Instantaneous Overcurrent 1
250P2 Phase Instantaneous Overcurrent 2 350P2 Phase Instantaneous Overcurrent 2
250N1 Neutral (3I
0
) Instantaneous Overcurrent 1 350N1 Neutral (3I
0
) Instantaneous Overcurrent 1
250N2 Neutral (3I
0
) Instantaneous Overcurrent 2 350N2 Neutral (3I
0
) Instantaneous Overcurrent 2
250G1 Ground Instantaneous Overcurrent 1 351P Phase Time Overcurrent
250G2 Ground Instantaneous Overcurrent 2 351N Neutral (3I
0
) Time Overcurrent
251P Phase Time Overcurrent 351G Ground Time Overcurrent
251N Neutral (3I
0
) Time Overcurrent 387TG Ground Differential (Restricted Ground
Fault)
251G Ground Time Overcurrent 3THD Total Harmonic Distortion Level
287TG Ground Differential (Restricted Ground
Fault)
3AD Current Demand
2THD Total Harmonic Distortion Level
2AD Current Demand