Delta 4000 Manuel d'instructions télécharger pdf (Page 28)

81331 Rev 01 Nov 2010

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.

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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Delta 4000 Manuel d'instructions Page 28