OPERATION
AVTMTTR100-ENG Rev 6 Nov 2015
63
ratios for multiple windings, the % Deviation, and polarity (additive or subtractive)
of the transformer, if function is activated. Letter "A" or "S" in the parentheses
indicates the expected polarity of the transformer.
TEST RESULT 2 screen is displayed by pressing the right scroll key. It contains
the following information: Test Number, Vector Group, Phase displacement
between high side and low side windings, Excitation current (no-load), DC
winding resistance of the high side and the low side(s), if function is activated.
Pressing 1 in the TEST RESULT 2 screen, one can provide HEADER information
such as, Company name, Substation name or location, Manufacturer name,
Transformer rating, Temperature, %RH and Operator’s name. This information
will be available for the test report when printed. In addition, one can print the
HEADER from this screen or return to TEST RESULT 2 screen.
From the TEST RESULT 2 screen, one can also select the following by pressing
the appropriate number: Print the test result by selecting 2, Store the test result
by selecting 3, Re-test by selecting 4, return to TEST RESULT 1 screen by
selecting the left scroll key, or return to the MAIN MENU by pressing the asterisk
key. Returning to the MAIN MENU screen will erase any test results that have
been accumulated but not saved.
Full Test Single Phase Tapped Transformer
When testing tapped transformers the procedure will be the same as described
above. However, additional information will be requested in the various Test
Setup screens such as: number of taps, nominal tap number, highest tap
number, etc. TTR100 accepts letter, numeric and R-N-L (for the tap changers)
designation of the taps on both H and X side of transformer. Should an error be
made in entering the information, select the associated information number and
re-enter the information. The voltages at the taps to be tested are displayed on
the screen.
At the conclusion of the test, store the test result prior to testing the next tap.
Otherwise the test results will be lost. A different test number will identify each
tap test result however the transformer ID will remain the same based on the
information provided in the header information.
To test other taps, select 5 "Next Test" on TEST RESULT 2 screen. Additional
TEST SETUP screens will be displayed. Select 2, and enter the number of the
tap to be tested, followed by 3. Start Test. Continue this process until all of the
taps have been tested.
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