Delta 4000 Instruction Manual download pdf (Page 80)

81331 Rev 01 Nov 2010

NOTE: Once Tests 5, 6 and 7 are completed, Line 8 will populate with values

calculated by subtracting Test 6 from Test 5. This is applicable for

values of capacitance, current and watts. Line 8 is a calculated

comparison to the direct measurements of Test 7. 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 7 and

Line 8 vary by more than 2%, the Insulation Rating (IR) will

automatically populate with B (Bad).

Lines 9 and 10 will automatically populate with calculated values once Tests 1-7

and all bushing tests are completed. Line 9 is a corrected value for the insulation

of the high voltage winding to the transformer tank minus the measured losses

of the high side bushings. Line 10 is a corrected value for the insulation of the

low voltage winding to the transformer tank minus the measured losses of the

low side bushings.

Bushing C1 Tests

If the transformer windings are terminated using condenser bushings, then

measurements of the C1 insulation on each bushing are generally made. The

bushing insulation C1 is internal and is the insulation between the bushing center

1 2 ... 75 76 77 78 79 80 81 82 83 84 85 ... 107 108

No comments

Delta 4000 Instruction Manual Page 80