GE 745 TRANSFORMER MANAGEMENT RELAY

1-6 745 Transformer Management Relay GE Power Management
1.2 TECHNICAL SPECIFICATIONS 1 PRODUCT OVERVIEW
1
ANALOG INPUT
Type: DC mA
Ranges: 0-1 mA, 0-5 mA, 0-10 mA, 0-20 mA, or 4-20 mA (programmable)
Input Impedance: 375 Ω ± 10%
Conversion Range: 0 to 21 mA
Accuracy: ± 1% of full scale (based on input range)
TAP POSITION
Type: resistance (ohms)
Range: 0 to 500 Ω or 0.5 to 5.0 kΩ
Bias Current: 1 mA or 10 mA (based on input range)
Accuracy: ± 1% of full scale (based on input range)
RTD
Type: 3 wire
RTD Type 100 Ω Platinum (DIN.43760)
100 Ω Nickel
120 Ω Nickel
IRIG-B INPUT
Amplitude-Modulated: 1.0 to 10 V pk-pk
DC Shift: TTL
Input Impedance 70 to 100 kΩ
1.2.3 PROTECTION ELEMENTS
PERCENT DIFFERENTIAL PROTECTION
Operating Current Pickup: 0.05 to 1.00 in steps of 0.01 x CT
Dropout Level: 97 to 98% of Pickup
SLOPE-1 Range: 15% to 100% in steps of 1
SLOPE-2 Range: 50% to 200% in steps of 1
KP (SLOPE-1 Kneepoint): 1.0 to 20.0 in steps of 0.1 x CT
Harmonic Restraint: 0.1% to 65.0% in steps of 0.1
Operate Time: Solid State Output: Pickup < 1 x CT: 42 to 52 ms
1 x CT < Pickup < 1.1 × kneepoint: 34 to 44 ms
Pickup > 1.1 × kneepoint: 26 to 36 ms
Relay Outputs 2-5: Pickup < 1 x CT: 46 to 56 ms
1 x CT < Pickup < 1.1 × kneepoint: 38 to 48 ms
Pickup > 1.1 × kneepoint: 30 to 40 ms
INSTANTANEOUS DIFFERENTIAL OVERCURRENT
Pickup Level: 3.00 to 20.00 in steps of 0.01 x CT
Dropout Level: 97 to 98% of Pickup
Level Accuracy: Per current input
Operate Time: Solid State Output: at 1.2 x pickup: 22 to 30 ms
at 2.0 x pickup: 18 to 26 ms
at 4.0 x pickup:11 to 19 ms
Relay Outputs 2-5: at 1.2 x pickup: 28 to 36 ms
at 2.0 x pickup: 24 to 32 ms
at 4.0 x pickup: 17 to 25 ms