GE 745 TRANSFORMER MANAGEMENT RELAY Instruction Manual page 19

1 PRODUCT OVERVIEW
PHASE / NEUTRAL / GROUND / NEGATIVE SEQUENCE TIME OVERCURRENT
Pickup Level:
Dropout Level:
Curve Shape:
Curve Multiplier Time Dial:
Reset Type:
Level Accuracy:
Timing Accuracy:
PHASE / NEUTRAL / GROUND / NEGATIVE SEQUENCE INSTANTANEOUS OVERCURRENT
Pickup Level:
Dropout Level:
Time Delay:
Level Accuracy:
Operate Time:
UNDERFREQUENCY (2 ELEMENTS)
Operating Current Pickup:
Operating Voltage Pickup
Pickup Level:
Dropout Level:
Time Delay:
Signal Source:
Level Accuracy:
Operate Time:
FREQUENCY RATE OF CHANGE (4 ELEMENTS)
Operating Current Pickup:
Operating Voltage Pickup
Pickup Level:
Dropout Level:
Rate 1/2/3/4:
Dropout Level:
Signal Source:
Level Accuracy:
Operate Time:
GE Power Management
0.05 to 20.00 in steps of 0.01 x CT
97 to 98% of Pickup
ANSI Extremely/Very/Moderately/Normally Inverse;
Definite Time (0.1 s base curve);
IEC Curve A/B/C and Short;
FlexCurve™ A/B/C (programmable curves);
IAC Extreme/Very/Inverse/Short
0.5 to 30 for ANSI, IAC & FlexCurves™ in steps of 0.1 s;
0.05 to 100.00 for IEC curves in steps of 0.01
Instantaneous or Linear
Per current input
at ≥ 1.03 × pickup: ± 3% of trip time or ± 20 ms (whichever is greater)
0.05 to 20.00 in steps of 0.01 × CT
97 to 98% of Pickup
0 to 60000 in steps of 1 ms
Per current input
Solid State Output: at 1.2 × pickup: 22 to 30 ms
at 2.0 × pickup: 18 to 26 ms
at 4.0 × pickup: 11 to 19 ms
Relay Outputs 2-5: at 1.2 × pickup: 28 to 36 ms
at 2.0 × pickup: 24 to 32 ms
at 4.0 × pickup: 17 to 25 ms
0.05 to 1.00 in steps of 0.01 × CT
0.10 to 0.99 in steps of 0.01 × VT
45.00 to 59.99 in steps of 0.01 Hz
Pickup + 0.03 Hz
0.00 to 600.00 s in steps of 0.01 s
Winding 1 phase A current / voltage
±0.02 Hz
Solid State Output: at 3% beyond pickup: 120 to 150 ms
Relay Outputs 2 to 5: at 3% beyond pickup: 125 to 155 ms (delay set at 0.0 sec.)
0.05 to 1.00 in steps of 0.01 × CT
0.10 to 0.99 in steps of 0.01 × VT
45.00 to 59.99 in steps of 0.01 Hz
Pickup + 0.03 Hz
0.1 to 5.0 in steps of 0.1 Hz/sec.
Pickup + 0.07 Hz/sec.
Winding 1 phase A current / voltage
±0.02 Hz
The operate time of the frequency trend element is variable and is dependent on the decay
rate setting and the supervision frequency level.
745 Transformer Management Relay
1.2 TECHNICAL SPECIFICATIONS
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