380375 V1.5 3/04
7
Testing Multi Conductor Cables
1.
Completely disconnect the
cable under test from its
source and destination.
2.
Refer to the diagrams at
right for three possible
tests.
Transformer Testing
Transformer tests are performed with the transformer completely disconnected from the
line and the load. Note that the case ground should not be removed.
The five tests listed below will completely test a single-phase transformer. Note that at
least 1 minute should be allowed between each test.
1.
High voltage winding to low voltage winding and ground
2.
Low voltage winding to high voltage winding and ground
3.
High voltage winding to low voltage winding (pictured below)
4.
High voltage winding to ground
5.
Low voltage winding to ground
Testing one
conductor to
all of the
conductors
Testing one
conductor
to earth
Testing one
conductor to
all conductors
minus ground
EARTH
LINE
EARTH
LINE
GUARD
GUARD
LINE
EARTH
Connect the
BLACK lead here
Connect the
RED lead here
