Delta 4000 Manuál s instrukcemi stáhnout pdf (Strana 89)

Delta 4310 User Interface

81331 Rev 01 Nov 2010

Test 11 - This is a measurement of the insulation between the transformer

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

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

NOTE: Once Tests 9, 10 and 11 are completed, Line 12 will populate with

values calculated by subtracting Test 10 from Test 9. This is applicable

for values of capacitance, current and watts. Line 12 is a calculated

comparison to the direct measurements of Test 11. 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 11 and

Line 12 vary by more than 2%, the Insulation Rating (IR) will

automatically populate with B (Bad).

Lines 13, 14 and 15 will automatically populate with calculated values once Tests

1-11 and all bushing tests are completed. Line 13 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 14 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. Line 15 is a corrected value for the

insulation of the tertiary winding to the transformer tank minus the measured

losses of the tertiary 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

conductor and its test tap (capacitance tap). If a bushing does not have a test

tap, then the C1 measurement is not performed.

NOTE: These tests may be performed with the bushing shorting leads still in

place from the overall insulation tests. This allows all the high side

bushing C1 tests to be performed without having to move the HV lead

from bushing to bushing. It will still be necessary to move the Red lead

to the individual test taps for each test.

Test 16 - This is the test of the C1 insulation on the high side phase 1 bushing.

The HV lead is connected to the bushing top terminal and the Red lead is

connected to the bushing test tap. Test mode is UST-R.

Tests 17, 18 and 19 are C1 measurements for the other high side bushings. Test

14 is used only if the high winding has a neutral bushing with a test tap. Make

sure to move the Red lead connection from bushing to bushing as necessary.

Test mode is UST-R.

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Delta 4000 Manuál s instrukcemi Strana 89