1-4
745 Transformer Management Relay
GE Multilin
1.2 SPECIFICATIONS
1 PRODUCT OVERVIEW
1
1.2SPECIFICATIONS
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
Options:
LO/HI (specified when ordering)
LO Range:
DC = 20 to 60 V;
AC = 20 to 48 V at 48 to 62 Hz
HI Range:
DC = 90 to 300 V;
AC = 70 to 265 V at 48 to 62 Hz
Power:
30 VA nominal, 40 VA maximum
Fuse (not accessible)
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
×
CT:
± 0.25% of 4
×
CT (±0.01
×
CT)
at
≥
4
×
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
×
CT (±0.01
×
CT)
at
≥
4
×
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
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
Number of Inputs:
16
Dry Contacts:
1000
Ω
maximum ON resistance
(32 V DC at 2 mA provided by 745)
Wet Contacts:
30 to 300 V DC at 1.5 mA
ANALOG INPUT
Type:
DC mA
Ranges:
0 to 1 mA, 0 to 5 mA, 0 to 10 mA,
0 to 20 mA, 4 to 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 k
Ω
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 k
Ω
