Delta 4000 Instruction Manual Page 87

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Delta 4310 User Interface
81331 Rev 01 Nov 2010
79
94500 – Three-Winding Transformer
Basic Form Information
The PF Three-Winding Transformer form is used for power factor/dissipation
factor testing medium and high voltage power transformers, generally those with
at least one winding rated over 5kV. Nameplate information (serial number,
ratings, etc.) should be entered which identifies the asset being tested, and
general information regarding the test conditions (test date, weather conditions,
etc.) should also be noted.
Description of Tests
Transformer Overall Tests
Prior to the overall insulation tests, short all high side (H) bushings together and
short all low side (L) bushings together, keeping both windings separated.
Remove ground connections from neutral bushings.
Test 1 - This is a measurement of the insulation between the transformer high
voltage winding and the transformer tank, plus the insulation between the high
voltage winding and the low voltage winding, both measured in parallel.
Connect the HV cable to the H (high voltage) winding, connect the Red lead to
the L (low voltage) winding and Blue lead to the T (tertiary) winding. Test mode
is GSTg-B.
Test 2 - This is a measurement of the insulation between the transformer high
voltage winding and the transformer tank. Connections are exactly the same as
for Test 1. Test mode is GSTg-RB.
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