GE 745 TRANSFORMER MANAGEMENT RELAY

1-2 745 Transformer Management Relay GE Power Management
1.1 INTRODUCTION 1 PRODUCT OVERVIEW
1
1.1.2 SUMMARY OF PROTECTION FEATURES
SYMBOL COMMON PROTECTION ELEMENT SYMBOL WINDING 2 PROTECTION ELEMENT
59/81-1 Volts-Per-Hertz 1 250/46 Negative Sequence Instantaneous O/C
59/81-2 Volts-Per-Hertz 2 251/46 Negative Sequence Time O/C
81U-1 Underfrequency 1 250P1 Phase Instantaneous O/C 1
81U-2 Underfrequency 2 250P2 Phase Instantaneous O/C 2
81U-R1 Frequency Decay Rate 1 250N1 Neutral (3I
0
) Instantaneous O/C 1
81U-R2 Frequency Decay Rate 2 250N2 Neutral (3I
0
) Instantaneous O/C 2
81U-R3 Frequency Decay Rate 3 250G1 Ground Instantaneous O/C 1
81U-R4 Frequency Decay Rate 4 250G2 Ground Instantaneous O/C 2
81-H5 5th Harmonic Level 251P Phase Time O/C
81O Overfrequency 251N Neutral (3I
0
) Time O/C
87 Differential (Percent) 251G Ground Time O/C
50/87 Instantaneous Differential 287TG Ground Differential (
Restricted Ground Fault
)
AN-1 Analog Input Level 1 2THD Total Harmonic Distortion Level
AN-2 Analog Input Level 2 2AD Current Demand
Insulation Aging
– Aging Factor
– Hottest Spot Limit
– Total Accumulated Life
Tap Changer Monitor
SYMBOL WINDING 1 PROTECTION ELEMENT SYMBOL WINDING 3 PROTECTION ELEMENT
150/46 Negative Sequence Instantaneous O/C 350/46 Negative Sequence Instantaneous O/C
151/46 Negative Sequence Time O/c 351/46 Negative Sequence Time O/c
150P1 Phase Instantaneous O/C 1 350P1 Phase Instantaneous O/C 1
150P2 Phase Instantaneous O/C 2 350P2 Phase Instantaneous O/C 2
150N1 Neutral (3I
0
) Instantaneous O/C 1 350N1 Neutral (3I
0
) Instantaneous O/C 1
150N2 Neutral (3I
0
) Instantaneous O/C 2 350N2 Neutral (3I
0
) Instantaneous O/C 2
150G1 Ground Instantaneous O/C 1 351P Phase Time O/C
150G2 Ground Instantaneous O/C 2 351N Neutral (3I
0
) Time O/C
151P Phase Time O/C 351G Ground Time O/C
151N Neutral (3I
0
) Time O/C 387TG Ground Differential (
Restricted Ground Fault
)
151G Ground Time O/C 3THD Total Harmonic Distortion Level
187TG Ground Differential (
Restricted Ground Fault
) 3AD Current Demand
1THD Total Harmonic Distortion Level
1AD Current Demand