GE Power Management
745 Transformer Management Relay
1-7
1 PRODUCT OVERVIEW
1.2 TECHNICAL SPECIFICATIONS
1
PHASE / NEUTRAL / GROUND / NEGATIVE SEQUENCE TIME OVERCURRENT
Pickup Level:
0.05 to 20.00 in steps of 0.01 x CT
Dropout Level:
97 to 98% of Pickup
Curve Shape:
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
Curve Multiplier Time Dial:
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
Reset Type:
Instantaneous or Linear
Level Accuracy:
Per current input
Timing Accuracy:
at
≥
1.03
×
pickup: ± 3% of trip time or ± 20 ms (whichever is greater)
PHASE / NEUTRAL / GROUND / NEGATIVE SEQUENCE INSTANTANEOUS OVERCURRENT
Pickup Level:
0.05 to 20.00 in steps of 0.01
×
CT
Dropout Level:
97 to 98% of Pickup
Time Delay:
0 to 60000 in steps of 1 ms
Level Accuracy:
Per current input
Operate Time:
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
UNDERFREQUENCY (2 ELEMENTS)
Operating Current Pickup:
0.05 to 1.00 in steps of 0.01
×
CT
Operating Voltage Pickup
0.10 to 0.99 in steps of 0.01
×
VT
Pickup Level:
45.00 to 59.99 in steps of 0.01 Hz
Dropout Level:
0.03 Hz
Time Delay:
0.00 to 600.00 s in steps of 0.01 s
Signal Source:
Winding 1 phase A current / voltage
Level Accuracy:
±0.02 Hz
Operate Time:
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.)
FREQUENCY RATE OF CHANGE (4 ELEMENTS)
Operating Current Pickup:
0.05 to 1.00 in steps of 0.01
×
CT
Operating Voltage Pickup
0.10 to 0.99 in steps of 0.01
×
VT
Pickup Level:
45.00 to 59.99 in steps of 0.01 Hz
Dropout Level:
0.03 Hz
Rate 1/2/3/4:
0.1 to 5.0 in steps of 0.1 Hz/sec.
Dropout Level:
0.07 Hz/sec.
Signal Source:
Winding 1 phase A current / voltage
Level Accuracy:
±0.02 Hz
Operate Time:
The operate time of the frequency trend element is variable and is dependent on the decay
rate setting and the supervision frequency level.
Summary of Contents for 745 TRANSFORMER MANAGEMENT RELAY
Page 30: ...2 8 745 Transformer Management Relay GE Power Management 2 3 SECURITY 2 GETTING STARTED 2 ...
Page 210: ...7 36 745 Transformer Management Relay GE Power Management 7 2 BLOCK DIAGRAMS 7 SCHEME LOGIC 7 ...
Page 322: ...9 12 745 Transformer Management Relay GE Power Management 9 3 USING 745PC 9 745 PC SOFTWARE 9 ...
Page 396: ...A 4 745 Transformer Management Relay GE Power Management A 1 FIGURES AND TABLES APPENDIXA A ...
Page 400: ...C 2 745 Transformer Management Relay GE Power Management C 1 WARRANTY INFORMATION APPENDIXC C ...
Page 406: ...vi 745 Transformer Management Relay GE Power Management ...
Page 407: ...GE Power Management 745 Transformer Management Relay NOTES ...
