4.1 Measurement accuracy
4 Measurement functions
Technical description
186
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VM259.EN007
4.1.
Measurement accuracy
Measurement accuracy Phase current inputs I
L1
, I
L2
, I
L3
Measuring range
25mA – 250 A
Inaccuracy
I
7.5 A
0.5 % of value or 15 mA
I > 7.5 A
3 % of value
The specified frequency range is 45 Hz – 65 Hz.
Voltage inputs U
A
, U
B
, U
C
The usage of voltage inputs depends on the configuration
parameter ―voltage measurement mode‖. For example, U
c
is the
zero sequence voltage input U
0
if the mode ―1LL+U
0
/LLy‖ is
selected.
Measuring range
0 – 160 V
Inaccuracy
0.5 % or 0.3 V
The specified frequency range is 45 Hz – 65 Hz.
Residual current input I
0
The rated input I
n
is 5A, 1 A or 0.2 A. It is specified in the
order code of the device.
Measuring range
0 – 10 xI
n
Inaccuracy
I
1.5 xI
n
0.3 % of value or 0.2 % of I
n
I > 1.5 xI
n
3 % of value
The specified frequency range is 45 Hz – 65 Hz.
Frequency
Measuring range
16 Hz – 75 Hz
Inaccuracy
10 mHz
Power measurements P, Q, S
Inaccuracy
|PF|> 0.5
1 % of value or 3 VA
SEC
The specified frequency range is 45 Hz – 65 Hz.
Power factor
Inaccuracy
|PF| >0.5
0.02 unit
The specified frequency range is 45 Hz – 65 Hz.
Energy counters E+, Eq+, E-, Eq-
Inaccuracy
|PF| > 0.5
1 % of value or 3 Wh
secondary
/1 h
The specified frequency range is 45 Hz – 65 Hz.
THD and harmonics
Inaccuracy
I, U > 0.1 PU
2 % units
Update rate
Once a second
The specified frequency range is 45 Hz – 65 Hz.
