Measuring System - Siemens SICAM 7KG85X Manual

Parameter
Prim. nom.
Current Inputs
CT primary
CT secondary
Zero-Point Suppression
Zero-point suppression
(in % of Vrated and Irated)

Measuring System

2.5.3
The device measures the power quality according to IEC 61000-4-30 Ed. 3 in 1-phase or polyphase energy
supply systems.
The basic measuring interval for calculation of the following values is 10 cycles in 50-Hz systems or 12 cycles
in 60-Hz systems:
•
Voltage RMS values
•
Voltage harmonics
•
Voltage unbalance
•
Currents
•
Current harmonics
NOTE
i i
Depending on parameter settings, the browser displays the measured values with the corresponding unit
or indications in a table that is updated every 15 s. Harmonics can be represented in a table or in a diagram.
The measuring functions are divided into the following parts:
•
PQ measurements
•
Operational measurements
•
Energy management and counter functions
An overview of the measured quantities demanded according to IEC 61000-4-30 Ed.3, their measurement
uncertainty and measuring ranges are represented in the following tables.
SICAM, SICAM P850/P855 7KG85X, Manual
E50417-H1040-C482-A9, Edition 03.2022
Default Setting
400.0 V
5.0 A
5.0 A
0.3 %
Setting Range
1.0 V to 1 000 000.0 V (depending on the setting of
PT primary)
IEC 61000-4-30 Class A:
•
Up to 230 V:
200 % overvoltage
•
> 230 V to 400 V:
200 % to 15 % overvoltage
UL conditions:
•
Up to 170 V:
200 % overvoltage
•
> 170 V to 300 V:
200 % to 15 % overvoltage
1.0 A to 100 000.0 A
1.0 A to 10.00 A
0.0 % to 10.0 %
Basic Functions
2.5 AC Measurement
49