Vanguard ATRT-01_01B S3 - Manual (Page 6)

ATRT-01/01B S3 USER’S MANUAL REV 1
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1.0 INTRODUCTION
1.1 General Description and Features
The ATRT-01 S3 is Vanguard’s fourth generation, micro-processor based, single phase,
automatic transformer turns-ratio tester. This portable test unit is available in two models, the
ATRT-01 S3 (line power only), and the ATRT-01B S3 (rechargeable-battery powered).
The ATRT-01 S3 uses the IEEE C57.12.90 measuring method to determine the transformer
turns-ratio. The transformer turns-ratio is determined by precisely measuring the voltages
across the unloaded transformer windings. The ATRT-01 S3’s measuring circuitry self adjusts
before each measurement to ensure turns-ratio accuracy. Two selectable test voltages, 4Vac
and 40Vac, offer flexibility in testing different types of transformers.
The ATR-01 S3 can measure turns-ratios ranging from 0.8 to 15,000 and can be used to test
voltage regulators, power transformers, current transformers (CT), and potential transformers
(PT). The ATRT-01 S3 also measures and displays transformer-winding excitation current,
winding polarity, and winding phase angle. Test results are displayed on a back-lit LCD screen
(128 x 64 pixels) that is viewable in bright sunlight and low-light conditions.
In addition to measuring a transformer’s turns-ratio, the transformer’s name plate voltages can
also be entered, and the ATRT-01 S3 will then display the turns-ratio percentage error. This
convenient feature eliminates any user-calculation errors when testing transformers.
When testing a 3-phase transformer, the ATRT-01 S3 provides connection information (H and X
test leads to the transformer bushings) for phase A, B and C tests. The three phase test results
(turns-ratio, excitation current, winding polarity, phase-angle, and percentage error) are
displayed on the LCD screen.
User Interface
The ATRT-01 S3 features a back-lit LCD screen (128 x 64 pixels) that is viewable in direct sunlight
and low-light levels. A rugged 16-key membrane keypad is used to enter test information and to
operate the unit.
Test Record Storage
The ATRT-01 S3 can store 128 records of 33 readings internally, and up to 999 test records on
an external USB Flash drive. Test records can be recalled using the included Transformer
Analysis PC software.
Computer Interface
A Windows®-based (XP/Vista/7) Transformer Analysis Software is provided with each unit and
can be used to remotely control the ATRT-01 S3 via the RS-232C port. Using the Transformer
Analysis software, the user can retrieve test records (from the ATRT-01 S3’s memory or a USB
Flash drive), analyze test results, and print test results on a desktop printer. Test results are
automatically exported to PDF, Excel, and XML formats.