Atec Vanguard-ATRT-01 Series - Manual (Page 2)

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Three Models Deliver Maximum Flexibility
The ATRT-01 S2 is Vanguard’s third-generation micro-processor-based, single-phase,
automatic, transformer-turns-ratio tester. This portable test equipment is offered in
three models: the ATRT-01 S2, ATRT-01B S2, and ATRT-01D S2. The ATRT-01 S2 is
ac-line powered; the ATRT-01B S2 is ac-line or rechargeable-battery powered, and
the ATRT-01D S2 is powered by six D-cells.
The ATRT-01 S2 determines the transformer turns-ratio using the IEEE C57.12.90
measurement method. The transformer turns-ratio is determined by precisely
measuring the voltages across the unloaded transformer windings. The ATRT-01
S2’s measuring circuitry self calibrates before each measurement to ensure turns-
ratio accuracy.
The ATRT-01 S2 measures turns-ratios ranging from 0.800 to 15,000 and can be
used to test voltage regulators, power transformers, current transformers (CT),
and Potential Transformers (PT). The ATRT-01 S2 also measures and displays
transformer-winding excitation current, and winding polarity. Test results are dis-
played on a back-lit LCD screen (4 lines by 20 characters).
In addition to measuring a transformer’s turns-ratio, nameplate voltages can also
be entered via the keypad, and the ATRT-01 S2 will then display the turns-ratio error
as a percentage. This convenient feature eliminates any user-calculation error when
testing transformers.
If a 3-phase transformer is being tested, the ATRT-01 S2 will also provide connection
information (H and X test probes to transformer bushings) for phases A, B, and C
tests. Three-phase test results (turns-ratio, excitation current, winding polarity, and
percentage error) are displayed on the LCD screen at the end of each test.
User Interface
The ATRT-01 S2 features a back-lit LCD screen (4 lines by 20 characters) that is
viewable in both bright sunlight and low-light levels. Displayed test results include
turns-ratio, winding polarity, excitation current, and percentage error calculation.
The ATRT-01 S2’s rugged, 16-key membrane keypad is used to select a test and enter
the nameplate voltages for turns-ratio percentage error calculation.
Computer Interface
The ATRT-01 S2, ATRT-01B S2 and the ATRT-01D S2 can be used with a PC via
the RS-232C interface. Windows
® XP/Vista-based software is provided with each
unit and can be used to test transformers and to store the test results on the com-
puter. The test results can be retrieved later, in the office for example, for analysis
and for printing on an office printer. The test results can also be exported in text
or Microsoft
® Excel format, thus allowing the results to be used with other PC
applications.
The included PC software can also be used to create test plans for specific trans-
formers. A test plan is comprised of the transformer nameplate voltages for each
tap setting. Computed turns-ratio is based on the nameplate voltages which can be
compared to the measured ratio to derive percentage error.
Battery Power for Exceptional Portability
The ATRT-01B S2 is powered by a 6-Volt, 7 Ampere-hour, lead-acid battery. The high
capacity battery, coupled with the ATRT-01B S2’s low power consuming circuitry,
allows the unit to be used continuously for up to 6 hours between re-charges. A
built-in charger lets the unit be used while the battery is being charged.
The ATRT-01D S2 uses 6 D-cell batteries. Up to 250 tests can be performed with one
set of D-cell batteries.
ATRT-01
Single Phase Transformer Turns-
Excitation
Current Reading
Instructions: ATRT-01 Cable Connection
Measured Ratio
ATRT-01 Test Probes
Turn-ratio Error
in Percentage
Connection to
Transformer Bushing
Typical Test Results
Simplify