Measurement In Grounded Single-Phase Networks - WAGO 750-495/040-00 Series Manual

136 Connect Devices
7.6.2.2

Measurement in Grounded Single-Phase Networks

The "4-Wire Wye" ("4-W") topology is available in WAGO-I/O-Check for voltage
measurement.
This topology is fixed in firmware versions 04 and below and selectable in
WAGO-I/O-Check in firmware versions 05 and above.
The voltage transformer ratio can be parameterized in firmware versions 05 and
above and WAGO-I/O-Check versions IO-3.18.1 (CS0609) and above.
The measurement circuit basically corresponds to the "Grounded 3-Phase
Network with Neutral Conductor for Power Measurement and Voltage
Measurement on 3 Line Conductors for U
connection schematic, except that only connections L1 and N and connections
I1+ and I1− are connected.
Voltage measurement is performed via voltage transformers (VTs).
The current measurement is performed via current transformers (CTs) or
Rogowski Coils.
The measured values of unconnected voltage and current measurement inputs
have no significance.
The voltage transformer ratio and current transformer ratio must be taken into
account for the correct calculation of all values in the process image.
The nominal input voltage is:
- u = 200 V
LN
Voltage" setting
- u = 400 V
LN
Voltage" setting
Parameter 47 is used for the setting.
Manual
Version 1.2.0
750-495/040-00x 3-Phase Power Measurement Module 690 V
if a voltage ≤ 120 V
RMS
if a voltage > 120 V
RMS
WAGO-I/O-SYSTEM 750 XTR
> 400 V and u
LN RMS
is parameterized for the "Secondary
RMS
is parameterized for the "Secondary
RMS
≤ 400 V "
LN RMS