GE Power Management 745 Transformer Management Relay 1-5
1 PRODUCT OVERVIEW 1.2 TECHNICAL SPECIFICATIONS
1
1.2 TECHNICAL SPECIFICATIONS 1.2.1 APPLICABILITY
Transformers: 2 Winding or 3 Winding
Frequency: 50 or 60 Hz nominal
(frequency tracking allows operation from 2 to 65 Hz)
1.2.2 INPUTS
CONTROL POWER (POWER SUPPLY)
Options: LO/HI (specified when ordering)
LO Range: DC = 20 to 60 V; AC = 20 to 48 V @ 48 to 62 Hz
HI Range: DC = 90 to 300 V; AC = 70 to 265 V @ 48 to 62 Hz
Power: 30 VA nominal, 40 VA maximum
Fuse (not accessible): Hi-Volt: Current rating: 3.15 A
Type: 5 × 20 mm Slow-Blow Littelfuse, High Breaking Capacity
Model #: 2153.15
Low-Volt: Current rating: 3.15 A
Type: 5 × 20 mm Slow-Blow Littelfuse, High Breaking Capacity
Model #: 2153.15
PHASE CURRENT INPUT
Source CT: 1 to 50000 A primary / 1 or 5 A secondary
Relay Input: 1 A or 5 A (specified when ordering)
Burden: Less than 0.2 VA at rated load per phase
Conversion Range: 0.02 to 46 × CT
Accuracy: at < 4 x CT: ± 0.25% of 4 × CT (± 0.01 × CT)
at ≥ 4 x CT: ± 0.5% of 46 × CT (± 0.2 × CT)
Overload Withstand: 1 second at 80 times rated current
2 seconds at 40 times rated current
continuous at 3 times rated current
GROUND CURRENT INPUT
Source CT: 1 to 50000 A primary / 1 or 5 A secondary
Relay Input: 1 A or 5 A (specified when ordering)
Burden: Less than 0.2 VA at rated load
Conversion Range: 0.02 to 46 × CT
Accuracy: at < 4 × CT: ± 0.25% of 4 x CT (± 0.01 × CT)
at ≥ 4 × CT: ± 0.5% of 46 x CT (± 0.2 × CT)
Overload Withstand: 1 second at 80 times rated current
2 seconds at 40 times rated current
continuous at 3 times rated current
VOLTAGE INPUTS
Source VT: 2 to 600 kV / 60 to 120 V
Source VT Ratio: 1 to 5000 in steps of 1
Relay Input: 60 V to 120 V phase-neutral
Burden: Less than 0.025 VA at 120 V
Max. Continuous: 273 V
Accuracy: ± 1% of 2 × VT (± 0.02 × VT)
LOGIC INPUTS (16)
Dry Contacts: 1000 Ω maximum ON resistance (32 V DC at 2 mA provided by 745)
Wet Contacts: Inputs 1 to 16: 30 to 300 V DC at 1.5 mA
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