GE 745 TRANSFORMER MANAGEMENT RELAY User Manual

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: Pickup + 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: Pickup + 0.03 Hz
Rate 1/2/3/4: 0.1 to 5.0 in steps of 0.1 Hz/sec.
Dropout Level: Pickup + 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.

GE 745 TRANSFORMER MANAGEMENT RELAY Specifications

General

Brand	GE
Model	745 TRANSFORMER MANAGEMENT RELAY
Category	Relays
Language	English