Summary Of Protection Features - GE 745 TRANSFORMER MANAGEMENT RELAY Instruction Manual

1.1 INTRODUCTION
1
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
Tap Changer Monitor
SYMBOL WINDING 1 PROTECTION ELEMENT
150/46 Negative Sequence Instantaneous O/C
151/46 Negative Sequence Time O/c
150P1 Phase Instantaneous O/C 1
150P2 Phase Instantaneous O/C 2
150N1 Neutral (3I
150N2 Neutral (3I
150G1 Ground Instantaneous O/C 1
150G2 Ground Instantaneous O/C 2
151P Phase Time O/C
151N Neutral (3I
151G Ground Time O/C
187TG Ground Differential (
1THD Total Harmonic Distortion Level
1AD Current Demand
1-2
– Aging Factor
– Hottest Spot Limit
– Total Accumulated Life
) Instantaneous O/C 1
0
) Instantaneous O/C 2
0
) Time O/C
0
Restricted Ground Fault
745 Transformer Management Relay

1.1.2 SUMMARY OF PROTECTION FEATURES

SYMBOL WINDING 2 PROTECTION ELEMENT
250/46 Negative Sequence Instantaneous O/C
251/46 Negative Sequence Time O/C
250P1 Phase Instantaneous O/C 1
250P2 Phase Instantaneous O/C 2
250N1 Neutral (3I
250N2 Neutral (3I
250G1 Ground Instantaneous O/C 1
250G2 Ground Instantaneous O/C 2
251P Phase Time O/C
251N Neutral (3I
251G Ground Time O/C
Ground Differential (Restricted Ground Fault)
287TG
2THD Total Harmonic Distortion Level
2AD Current Demand
SYMBOL WINDING 3 PROTECTION ELEMENT
350/46 Negative Sequence Instantaneous O/C
351/46 Negative Sequence Time O/c
350P1 Phase Instantaneous O/C 1
350P2 Phase Instantaneous O/C 2
350N1 Neutral (3I
350N2 Neutral (3I
351P Phase Time O/C
351N Neutral (3I
351G Ground Time O/C
387TG Ground Differential (Restricted Ground Fault)
3THD Total Harmonic Distortion Level
) 3AD Current Demand
1 PRODUCT OVERVIEW
) Instantaneous O/C 1
0
) Instantaneous O/C 2
0
) Time O/C
0
) Instantaneous O/C 1
0
) Instantaneous O/C 2
0
) Time O/C
0
GE Power Management