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5-2
Measurement Functions
RMS Values
857-UM001A-EN-P – July 2009
The rated input I
is 5A, 1A or 0.2A. It is specified in the order code
n
of the device.
Table 5.3 – Residual Current Inputs I
Measuring range
Inaccuracy I ≤ 1.5 xI
n
I > 1.5 xI
n
The specified frequency range is 45 Hz – 65 Hz.
Table 5.4 – Frequency
Measuring range
Inaccuracy
Table 5.5 – Power Measurement P, Q, S
⏐PF⏐ > 0.5
Inaccuracy
The specified frequency range is 45 Hz – 65 Hz.
Table 5.6 – Power Factor
⏐PF⏐ > 0.5
Inaccuracy
The specified frequency range is 45 Hz – 65 Hz.
Table 5.7 – Energy Counters E+, Eq+, E-, Eq-
⏐PF⏐ > 0.5
Inaccuracy
The specified frequency range is 45 Hz – 65 Hz.
Table 5.8 – THD and Harmonics
Inaccuracy
I, U > 0.1 PU
Update rate
The specified frequency range is 45 Hz – 65 Hz.
RMS Currents
The device calculates the RMS value of each phase current. The
minimum and the maximum of RMS values are recorded and stored
(see "Minimum and Maximum Values").
=
+
+
2
2
I
I
I
...
rms
f
1
f
2
RMS Voltages
The device calculates the RMS value of each voltage input. The
minimum and the maximum of RMS values are recorded and stored
(see "Minimum and Maximum Values").
, I
01
02
0 – 10 xI
n
0.3 % of value or 0.2 % of I
3 % of value
16 Hz – 75 Hz
10 mHz
1% of value or 3 VA
0.02 unit
1T of value or 3 Wh
2 % units
Once a second
+
2
I
f
15
n
SEC
/1 h
secondary
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