Specifications; Applicability; Inputs - GE Multilin 745 Instruction Manual

745
Transformer Management Relay

Applicability

Inputs

2–4

Specifications

Transformers: 2 Winding or 3 Winding
Frequency: 50 or 60 Hz nominal
(frequency tracking allows
operation from 2 to 65 Hz)
CONTROL POWER
Options: LO/HI (specified when
ordering)
LO range: 20 to 60 V DC;
20 to 48 V AC at 48 to 62 Hz
HI range: 90 to 300 V DC;
70 to 265 V AC at 48 to 62 Hz
Power: 30 VA nominal, 40 VA max.
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 at order)
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 at order)
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
http://www.GEindustrial.com/multilin
Specifications
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 the 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 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
GE Multilin