Delta 4000 Instruction Manual Page 93

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Delta 4310 User Interface
81331 Rev 01 Nov 2010
85
secondary tap setting. Unless conditions warrant, future tests may be reduced to
the tap settings as found.
For each test line on the form, document the DETC (De-Energized Tap
Changer) and LTC (Load Tap Changer) tap settings and perform three tests per
form line. On WYE / Y connected transformers, connections would be H1-H0
/ U-N /A-N, H2-H0 / V-N / B-N and H3-H0 / W-N /C-N. On DELTA D
(or WHYE / Y without accessible neutral) connected transformers, connections
would be H1-H2 / U-V /A-B, H2-H3 / V-W / B-C and H3-H1 / W-U /C-A
To perform the individual tests, connect the HV lead to one bushing and the
Red lead to the second bushing. The test mode will be automatically set on the
test form to UST-R.
To initiate the individual tests, right-click on the blue highlighted field of the
desired test line. The test sequence initiates and the results will be placed in the
proper fields automatically.
The number of test lines in the table is adjustable. Enter the number of lines
desired for the number of taps to be tested.
NOTE: Exciting current measurements are pending voltage level. Make sure use
same voltage level as in earlier measurements on same transformer.
Exciting current may also vary due to core magnetization status, exciting
current measurements should be performed prior winding resistance
measurement or after demagnetization.
Multiple Quick Tests
Standards measurements may be complemented with additional measurements
executed from the Multiple Quick Test sub-form selected as a new test or as
manual measurements in the standard test forms. Check “Manual” in the select
test boxes and a Multiple Quick Test table will be added at the end of the form.
In the field "INSULATION TESTED" you enter information on what to be
tested, TEST MODE set/change the test mode, SUPPRESS set/change noise
suppression mode.
It is also possible to use Delta Control for controlling the test by clicking the
Delta Control button (above the table) in PowerDB form, Delta Control will
send all data to be stored in the Multiple Quick Test table.
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