Seg HighTECH MRG3 - Measuring Input: Phase Current; Influences on the Current Measurement; Measuring Input: Residual Voltage; Influences on the Residual Voltage Measuring

SEG Electronics GmbH Manual MRG3
72 DOK-TD-MRG3, Rev. D
7.3 Measuring input: phase current
Rated data: Nominal current I
N
1A or 5A
Nominal frequency f
N
50/60 Hz adjustable
Measuring range: 0 – 40 x I
2
Measuring accuracy: ±3% from measuring value or ±20mA
Power consumption in: at I
N
= 1 A 0.2 VA
current circuit at I
N
= 5 A 0.1 VA
Thermal withstand capability
in current circuit: dynamic current withstand
(half-wave) 250 x I
N
for 1 s 100 x I
N
for 10 s 30 x I
N
continuously 4 x I
N
Dropout to pickup ratio: >97%
Returning time: 40 ms
Time lag error class index E: ±20 ms
Minimum operating time: 40 ms
7.3.1 Influences on the current measurement
Auxiliary voltage: in the range of 0.8 < U
H
/U
HN
< 1.2
No additional influences can be measured
Frequency: Within the range from 0.9 < f/f
N
< 1.1; <0.2%/Hz,
only the first harmonic is evaluated.
Influences on delay times: no additional influences can be measured
7.4 Measuring input: Residual voltage
Rated data: Nominal voltage U
N
100V or 400V
see chapter 3.1.8 code plugs
Measuring range: 0 – 1.5 x U
N
Measuring accuracy: 2% from measuring value or 1% from rated value
Power consumption
in voltage circuit: < 1 VA per phase at U
N
Thermal withstand capability
in voltage circuit: continuously 1.5 x U
N
see chapter 3.1.8 code plugs Dropout to pickup ration:
U0>/U0>>:>99%
Returning time: ^ 60 ms
Time lag error class index E: ±10 ms
Minimum operating time: 40 ms
7.4.1 Influences on the residual voltage measuring
Auxiliary voltage: in the range of 0.8 <U
H
/U
HN
<1.2
no additional influences can be measured
Frequency: Only the first harmonic is evaluated. Harmonic waves are
suppressed.