57
UMG 509-PRO
www.janitza.com
Nominal current
The nominal current sets the reference point for:
·Overcurrent
·Current transients
·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“!
Fig. Configuring current transformer ratios
Voltage transformer
You can assign voltage transformer ratios to the
main measurement and the auxiliary measure-
ment respectively.
For measurements without a voltage transformer,
select the 400/400 V setting.
Setting range:
Primary
1 .. 1000000
Secondary
1 .. 999
Factory default setting:
Primary 400
Secondary
400
INFORMATION
You can set the nominal values for measuring
the K-factor and TDD via the GridVis® software
(see www.janitza.com).