GE TRANSFORMER MANAGEMENT RELAY 745 Instruction Manual page 10

1.1 INTRODUCTION
1
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
250N2 Neutral (3I
250G1 Ground Instantaneous Overcurrent 1
250G2 Ground Instantaneous Overcurrent 2
251P Phase Time Overcurrent
251N Neutral (3I
251G Ground Time Overcurrent
287TG Ground Differential (Restricted Ground Fault)
2THD Total Harmonic Distortion Level
2AD Current Demand
1-2
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) Instantaneous Overcurrent 1
0
) Instantaneous Overcurrent 2
0
) Time Overcurrent
0
Figure 1–1: SINGLE LINE DIAGRAM
745 Transformer Management Relay
SYMBOL WINDING 3 PROTECTION ELEMENT
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
1 PRODUCT OVERVIEW
GE Multilin