Siemens Sicam P855 7KG85 Series - Accuracy of the Frequency Measurement

4 Measurands and Recording
4.3 Display of Measurands
67SICAM P850/P855, 7KG85xx, Device Manual
E50417-H1040-C482-A6, Edition 10.2018
4.3.3 Accuracy of the Frequency Measurement
Table 4-16 Accuracy of the Frequency Measurement
Circuit Accuracy
Voltage to V
a-N
0 % to 15 % V
rated
: invalid
15 % to 30 % V
rated
: 40 mHz
30 % to 120 % V
rated
: 10 mHz
Voltage to V
b-N
0 % to 15 % V
rated
: invalid
15 % to 30 % V
rated
: 40 mHz
30 % to 50 % V
rated
: 30 mHz
50 % to 120 % V
rated
: 20 mHz
Voltage to V
c-N
0 % to 15 % V
rated
: invalid
15 % to 30 % V
rated
: 40 mHz
30 % to 120 % V
rated
: 10 mHz
NOTE
The frequency at measuring circuit V
a-N
is measured first. If the voltage V
a-N
is smaller than 30 % of V
rated
,
the measurement will automatically be carried out at measuring circuit V
c-N
. If the voltages V
a-N
and V
c-N
are
smaller than 30 % of V
nom
, the measurement will automatically be carried out at measuring circuit V
b-N
.