Delta 4000 Instruction Manual download pdf (Page 79)

Delta 4310 User Interface

81331 Rev 01 Nov 2010

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 winding and connect the Red lead to the X

winding. Test mode is GST-GND.

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.

Test 3 - This is a measurement of the insulation between the transformer high

voltage winding and the low voltage winding. Connections are exactly the same

as for Test 1 and 2. Test mode is UST-R.

NOTE: Once Tests 1, 2 and 3 are completed, Line 4 will populate with values

calculated by subtracting Test 2 from Test 1. This is applicable for

values of capacitance, current and watts. Line 4 is a calculated

comparison to the direct measurements of Test 3. Values on these two

lines should be essentially the same. If they are not, re-check all

connections and verify the proper operation of the test set. If Test 3 and

Line 4 vary by more than 2%, the Insulation Rating (IR) will

automatically populate with B (Bad).

Test 5 - This is a measurement of the insulation between the transformer low

voltage winding and the transformer tank, plus the insulation between the low

voltage winding and the high voltage winding, both measured in parallel.

Connect the HV cable to the low side (L) winding and connect the Red lead to

the H winding. Test mode is GST-GND.

Test 6 - This is a measurement of the insulation between the transformer low

voltage winding and the transformer tank. Connections are exactly the same as

for Test 5. Test mode is GSTg-RB.

Test 7 - This is a measurement of the insulation between the transformer low

voltage winding and the high voltage winding. Connections are exactly the same

as for Test 5 and 6. Test mode is UST-R.

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Delta 4000 Instruction Manual Page 79