GE 745 TRANSFORMER MANAGEMENT RELAY User Manual

1-8 745 Transformer Management Relay GE Power Management
1.2 TECHNICAL SPECIFICATIONS 1 PRODUCT OVERVIEW
1
OVERFREQUENCY (1 ELEMENT)
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: 50.01 to 65.00 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 2-5: at 3% beyond pickup: 125 to 155 ms (delay set to 0.0 s)
OVEREXCITATION ON VOLTS/HERTZ (2 ELEMENTS)
Operating Voltage Pickup: 0.10 to 0.99 in steps of 0.01 × VT
Pickup Level: 1.00 to 4.00 in steps of 0.01 V/Hz
Curve Shape: Definite Time (0.1 sec. base curve);
IEC Curve A/B/C
Time Delay: 0.00 to 600.00 s in steps of 0.01 s
Reset Delay: 0.0 to 6000.0 s in steps of 0.1 s
Signal Source: Voltage
Range: 10 to 65 Hz
Level Accuracy: ±0.02 V/Hz
Operate Time: Solid State Output: at 1.10 × pickup: 165 to 195 ms
Relay Outputs 2-5: at 1.10 × pickup: 170 to 200 ms (delay set to 0.0 s)
OVEREXCITATION ON 5
TH
HARMONIC LEVEL
Operating Current Pickup: 0.03 to 1.00 in steps of 0.01 × CT
Pickup Level: 0.1 to 99.9 in steps of 0.1%
Dropout: 95% of pickup
Time Delay: 0 to 60000 s in steps of 1 s
Signal Source: All phase currents
Operate Time: Solid State Output: at 1.10 × pickup: 20 to 120 ms
Relay Outputs 2-5: at 1.10 × pickup: 25 to 125 ms (delay set at 0.0 s)
INSULATION AGING: HOTTEST-SPOT LIMIT
Pickup Level: 50 to 300 in steps of 1°C
Delay: 0 to 60000 in steps of 1 min.
INSULATION AGING: AGING FACTOR LIMIT
Pickup Level: 1.1 to 10.0 in steps of 0.1
Delay: 0 to 60000 in steps of 1 min.
INSULATION AGING: LOSS OF LIFE LIMIT
Pickup Level: 0 to 20000 in steps of 1 x 10 h

GE 745 TRANSFORMER MANAGEMENT RELAY Specifications

General

Brand	GE
Model	745 TRANSFORMER MANAGEMENT RELAY
Category	Relays
Language	English