Protection Features - GE Multilin 745 Instruction Manual

Transformer Management Relay

Protection Features

Symbol Common Protection Element
59/81-1 Volts-Per-Hertz 1
59/81-2 Volts-Per-Hertz 2
81U-1 Underfrequency 1
81U-2 Underfrequency 2
81U-R1 Frequency Decay Rate 1
81U-R2 Frequency Decay Rate 2
81U-R3 Frequency Decay Rate 3
81U-R4 Frequency Decay Rate 4
81-H5 5th Harmonic Level
81O Overfrequency
87 Differential (Percent)
50/87 Instantaneous Differential
AN-1 Analog Input Level 1
AN-2 Analog Input Level 2
Insulation Aging: Aging Factor, Hottest
Spot Limit, and Total Accumulated Life
Tap Changer Monitor
Symbol Winding 2 Protection Element
250/46 Negative Sequence Instantaneous
Overcurrent
251/46 Negative Sequence Time Overcurrent
250P1 Phase Instantaneous Overcurrent 1
250P2 Phase Instantaneous Overcurrent 2
250N1 Neutral (3I ) Instantaneous Overcurrent 1
0
250N2 Neutral (3I ) Instantaneous Overcurrent 2
0
250G1 Ground Instantaneous Overcurrent 1
250G2 Ground Instantaneous Overcurrent 2
251P Phase Time Overcurrent
251N Neutral (3I ) Time Overcurrent
0
251G Ground Time Overcurrent
287TG Ground Differential (Restricted Ground
Fault)
2THD Total Harmonic Distortion Level
2AD Current Demand
2–2
745
The following table outlines the protection features available for Windings 1, 2, and
3, as well as the common protection elements.
http://www.GEindustrial.com/multilin
Symbol Winding 1 Protection Elements
150/46 Negative Sequence Instantaneous
Overcurrent
151/46 Negative Sequence Time Overcurrent
150P1 Phase Instantaneous Overcurrent 1
150P2 Phase Instantaneous Overcurrent 2
150N1 Neutral (3I ) Instantaneous Overcurrent 1
0
150N2 Neutral (3I ) Instantaneous Overcurrent 2
0
150G1 Ground Instantaneous Overcurrent 1
150G2 Ground Instantaneous Overcurrent 2
151P Phase Time Overcurrent
151N Neutral (3I ) Time Overcurrent
0
151G Ground Time Overcurrent
187TG Ground Differential (Restricted Ground
Fault)
1THD Total Harmonic Distortion Level
1AD Current Demand
Symbol Winding 3 Protection Elements
350/46 Negative Sequence Instantaneous
Overcurrent
351/46 Negative Sequence Time Overcurrent
350P1 Phase Instantaneous Overcurrent 1
350P2 Phase Instantaneous Overcurrent 2
350N1 Neutral (3I ) Instantaneous Overcurrent 1
0
350N2 Neutral (3I ) Instantaneous Overcurrent 2
0
351P Phase Time Overcurrent
351N Neutral (3I ) Time Overcurrent
0
351G Ground Time Overcurrent
387TG Ground Differential (Restricted Ground
Fault)
3THD Total Harmonic Distortion Level
3AD Current Demand
Introduction
GE Multilin