janitza UMG 512-Pro, User Manual And Technical Data

Page: 57 / 120

www.janitza.com
57
UMG 512-PRO
11.3.1 Transformers
The following settings for main and auxiliary mea-
surements can be made here:
·Current transformer
·Voltage transformer
·Nominal current
·Apply AUX / Main
- Rated voltage L-N, L-L
·Connection
as well as settings for ratios and monitoring for
residual current transformers.
Current transformers
You can assign current transformer ratios to the
main measurement and the auxiliary measure-
ment respectively.
For direct measurement of currents, select the
5/5 A setting.
Setting range:
Primary
1 .. 1000000
Secondary 1 .. 5
Factory default setting:
Primary
5
Secondary 5
Fig. Configuring the current transformer ratios
Nominal current
The nominal current defines the reference value
for the following measurements:
·Overcurrent
·Current transients
·K-factor
·Automatic scaling of graphics
Setting range: 0 .. 1000000 A
INFORMATION
NOTE!
For Janitza measurement devices and compo-
nents, use
only current transformers intended for
measuring purposes (“transformers”)!
“Transformers”, unlike “protection transformers”,
go into saturation at high current peaks. “Pro-
tection transformers” do not have this saturation
behavior and can therefore significantly exceed
the rated values in the secondary circuit. This
can overload the current measurement inputs of
the measurement devices!
Furthermore, please note that Janitza measure-
ment devices and components are
not to be
used for critical switching, control or protection
applications (protective relays)! Observe the
safety and warning information in the chapters
„7. Installation“ and „2. Safety“!