24
UMG 96RM-E
Current direction
The current direction can be individually corrected via
the existing serial interface or on the device for each
phase.
If incorrectly connected, a subsequent re-connection of
the current transformer is not required.
When residual current measurements (RCM) are being
carried out, there is no direction sensitive difference in
the residual currents on the network or load side (not
directionally sensitive).
c
Current transformer connections!
The secondary connection of the current
transformer must be short-circuited on this
before the current feed to the UMG 96RM-
E is disconnected!
If a test switch, which automatically short-
circuits the secondary wires of the current
transformer, is available then it is sufficient
to set this to the "Test" position insofar
as the short-circuiting device has been
checked beforehand.
c
Open-circuit current transformers!
High voltage spikes that are dangerous
to touch can occur on current transformers
that are driven with open-circuit secondary
windings!
W i t h " s a f e o p e n - c i r c u i t c u r r e n t
transformers" the winding insulation
is rated such that the current transformer
can be driven open. However, even these
current transformers are dangerous
to touch when they are driven open-circuit.
c
Caution!
A residual current measurement is done
using the terminals I5 and I6 (see page 30).
There is
no directional sensitivity of the
residual currents on the network or load
sides (not directionally sensitive).
c
Earthing of current transformers!
If a connection is provided for the earthing
of secondary windings then this must be
connected to the earth.
Summary of Contents for UMG 96 RM-E
Page 121: ...121 UMG 96RM E...
Page 126: ...126 UMG 96RM E...
