NOTE
The frequency measurement is carried out as software frequency measurement (V
a-N
, V
b-N
, V
c-N
> 2 V).
The frequency will be measured first at the measuring circuit V
a-N
.
If the voltage V
a-N
is < 2 V, the measurement is performed automatically at the measuring circuit V
b-N
.
If the voltage V
b-N
is < 2 V, the measurement is performed automatically at the measuring circuit V
c-N
.
If none of the voltages is > 2 V, the frequency measurement is invalid.
Measured Quantities and Their Operational Measuring Accuracy
Table 2-12 Measured Quantities and Operational Measuring Accuracy according to IEC 61557-12
Measured Quantity Unit Rated Value Measurement Range Accuracy Class
Current I
Acc. to parameterization
A AC 1 A
AC 5 A
20 % to 200 % I
rated
0.2
Current unbalance I
unbal
% – 0 % to 100 % I
rated
0.2
Active power P
+ demand, - supply
W – 20 % to 200 % I
rated
0.5
Reactive power Q induc-
tive, capacitive
var – 20 % to 200 % I
rated
2
Apparent power S VA – 20 % to 200 % I
rated
0.5
Power factor PF – – 0.5 inductive to 0.8
capacitive
1
Active power factor cos ϕ
– – -1 to +1 1
Phase angle ϕ
Degree – -180° to +180° ±2°
Active energy WP
+ demand, - supply
Wh – 20 % to 200 % I
rated
0.5
Class 0.5S acc. to IEC
62053-22
Reactive energy WQ
inductive, capacitive
varh – 20 % to 200 % I
rated
2
Class 2 acc. to IEC
62053-23
Apparent energy WS VAh – 20 % to 200 % I
rated
0.5
Subgroup Total
harmonics distortion of
voltage THDS V
ph
% – 0 % to 100 % 0.5
Subgroup Total
harmonics distortion of
current THDS I
ph
% – 0 % to 100 % 0.5
Harmonics of current
H_xI
ph
A – – Condition:
I
m
≥ 10 % I
rated
Maximum
error:
±5 % I
m
Condition:
I
m
< 10 % I
rated
Maximum
error:
±0.5 % I
rated
Basic Functions
2.5 AC Measurement
SICAM, SICAM P850/P855 7KG85X, Manual 51
E50417-H1040-C482-A9, Edition 03.2022
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