21
UMG 103
c
c
Short-circuit current transformer
connections!
The secondary connections of
the current transformers must be
short-circuited at these first before
the current supply leads to the
UMG103 are disconnected!
If a testing switch is available,
which automatically short
circuits the current transformer's
secondary leads, it is sufficient to
place this in the “test” position,
provided the short-circuiters
have been tested first.
Open current transformer!
High hazardous live voltage peaks
can occur at current transformers
which are operated open on the
secondary side!
The winding insulation in "safe
open current transformers"
is dimensioned so that the
current transformers can be
operated open. But these
current transformers are also
hazardous live if they are
operated open.
