Protection Elements - GE 745 TRANSFORMER MANAGEMENT RELAY Instruction Manual

1.2 TECHNICAL SPECIFICATIONS
ANALOG INPUT
Type:
1
Ranges:
Input Impedance:
Conversion Range:
Accuracy:
TAP POSITION
Type:
Range:
Bias Current:
Accuracy:
RTD
Type:
RTD Type
IRIG-B INPUT
Amplitude-Modulated:
DC Shift:
Input Impedance
PERCENT DIFFERENTIAL PROTECTION
Operating Current Pickup:
Dropout Level:
SLOPE-1 Range:
SLOPE-2 Range:
KP (SLOPE-1 Kneepoint):
Harmonic Restraint:
Operate Time:
INSTANTANEOUS DIFFERENTIAL OVERCURRENT
Pickup Level:
Dropout Level:
Level Accuracy:
Operate Time:
1-6
DC mA
0-1 mA, 0-5 mA, 0-10 mA, 0-20 mA, or 4-20 mA (programmable)
375 Ω ± 10%
0 to 21 mA
± 1% of full scale (based on input range)
resistance (ohms)
0 to 500 Ω or 0.5 to 5.0 kΩ
1 mA or 10 mA (based on input range)
± 1% of full scale (based on input range)
3 wire
100 Ω Platinum (DIN.43760)
100 Ω Nickel
120 Ω Nickel
1.0 to 10 V pk-pk
TTL
70 to 100 kΩ
0.05 to 1.00 in steps of 0.01 x CT
97 to 98% of Pickup
15% to 100% in steps of 1
50% to 200% in steps of 1
1.0 to 20.0 in steps of 0.1 x CT
0.1% to 65.0% in steps of 0.1
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
3.00 to 20.00 in steps of 0.01 x CT
97 to 98% of Pickup
Per current input
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
745 Transformer Management Relay
1 PRODUCT OVERVIEW

1.2.3 PROTECTION ELEMENTS

GE Power Management