CHAPTER 5: PRODUCT DESCRIPTION SPECIFICATIONS
369 MOTOR MANAGEMENT RELAY – QUICKSTART GUIDE
5–61
GROUND CURRENT INPUT (GF CT)
CT Input (rated):...............................................1 A/5 A secondary and 50:0.025
CT Primary: ........................................................1 to 5000 A (1 A/5 A)
Range: ................................................................0.1 to 1.0 × CT primary (1 A/5 A)
0.05 to 25.0 A (50:0.025)
Full Scale: ...........................................................1.0 × CT primary (1 A/5 A)
25 A (50:0.025)
Frequency:.........................................................20 to 100 Hz
Conversion: .......................................................True RMS 1.04ms/sample
Accuracy at 50/60 Hz:
for 1 A/5 A:
.........................................±
1.0% of full scale (1 A/5 A)
for 50:0.025
........................................±
0.07 A at <1 A
±
0.20 A at <25 A
Accuracy at variable frequency:
for 1 A tap: ....................................................±1.5% for 40 to 100 Hz
±2.5% for 20 to 39 Hz
for 5 A tap: ....................................................±2% for 40 to 100 Hz
±3% for 20 to 39 Hz
for 50:0.025: .................................................±0.2 A at <1 A
±0.6 A at <25 A
GROUND CT BURDEN
GROUND CT CURRENT WITHSTAND
PHASE/LINE VOLTAGE INPUT (VT) (OPTION M)
VT ratio:...............................................................1.00 to 240.00:1 in steps of 0.01
VT secondary: ..................................................240 V AC (full scale)
Range:..................................................................0.05 to 1.00 × full scale
Frequency:.........................................................20 to 100 Hz
Conversion: .......................................................True RMS 1.04 ms/sample
Accuracy:
...............................................±
2.5% of full scale for
≤
200 V at 20 to 39 Hz
±1% of full scale for 12 to 240 V at > 40 Hz
Burden:................................................................>200 k
Ω
Max. continuous: ............................................280 V AC
GROUND CT
INPUT (A)
BURDEN
VA
(
Ω
)
1 A
1
0.04
0.036
5
0.78
0.031
20
6.79
0.017
5 A
5
0.07
0.003
25
1.72
0.003
100
25
0.003
50:0.025
0.025
0.24
384
0.1
2.61
261
0.5
37.5
150
GROUND CT
WITHSTAND TIME
1 s
2 s
continuous
1 A
100 × CT
40 × CT
3 × CT
5 A
100 × CT
40 × CT
3 × CT
50:0.025
10 A
5 A
150 mA
