M
81331 Rev 01 Nov 2010
20
When making transformer excitation current measurements conduct all tests on
high-voltage windings only. This reduces the required charging current. In load
tap changers, set to fully raised or fully lowered position for routine tests.
F
WARNING
There is always the possibility of voltages being
induced at the terminals of a test specimen because
of proximity to energized high-voltage lines or
equipment. A residual static voltage charge may also
be present at these terminals. Ground each terminal
to be tested with a safety ground stick, then install
safety ground jumpers, before making connections.
Figure 6: Typical Test Setup for AC Insulation Testing of a Three-Phase Two-Winding Power
Transformer
DELTA4000
HIGH VOLTAGE
UNIT
DELTA4000
TEST SET
CONTROL UNIT
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