Delta 4000 Instruction Manual download pdf (Page 81)

Delta 4310 User Interface

81331 Rev 01 Nov 2010

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 11 - 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 12, 13 and 14 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.

Tests 15, 16, 17, and 18 are C1 measurements for the low side (L) bushings.

Test 18 is used only if the high winding has a neutral bushing with a test tap.

Test mode is UST-R.

NOTE: Many condenser bushings will have factory values for C1 stamped on

their nameplates, both for power factor and capacitance. The test results

for C1 on each bushing can be compared directly to its respective

nameplate values.

Oil Tests

The 93500 test form includes a single test line (Test 19) for capturing the results

of a power factor test on the insulating oil. This is generally done on a sample of

oil drawn from the main tank of the transformer under test. The test requires an

oil test cell designed for field use. The test cell should be a three-terminal cell

where connections for high voltage, measurement lead, and ground can be safely

made.

As with the other insulation tests on this test form, the test sequence is initiated

by right-clicking on the blue highlighted test number (19) at the bottom of the

Bushing C1 Tests table. The test mode used is UST-R.

1 2 ... 76 77 78 79 80 81 82 83 84 85 86 ... 107 108

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Delta 4000 Instruction Manual Page 81