Atec ATRT-03-S2 User Manual
ATRT-03
Automatic 3-Phase Transformer Turns-Ratio Tester
The ATRT-03 S2 is Vanguard’s third generation, microprocessor-based, automatic, three
phase, transformer turns-ratio tester. This lightweight and rugged portable unit is
designed for transformer testing at utility power substations.
The ATRT-03 S2 determines the transformer turns-ratio using the IEEE C57.12.90 measurement method. The ATRT-03 S2 outputs an excitation test voltage to the transformer’s primary windings. The induced secondary voltage is sensed and the transformer turns-ratio is
calculated. The ATRT-03 S2 can measure turns-ratios from 0.8 to 15,000. The transformer
turns-ratio, excitation current, and phase-angle readings are displayed on the large backlit LCD. The built-in transformer type detection feature allows the ATRT-03 S2 to detect and
test 130 transformer types defined by ANSI, CEI/IEC and Australian standards.
The ATRT-03 S2 can be used as a stand-alone unit or can be computer-controlled. It can
be operated locally using its alpha-numeric keypad and rotary switch. Information is
displayed on a back-lit LCD screen (64 x 128 dot graphic) that is viewable in both
bright sunlight and low-light levels. Test reports can be printed in the field on the unit’s
built-in 4.5-inch wide thermal printer. The ATRT-03 S2 is capable of storing up to 112
test records and 128 test plans in Flash EEPROM memory. Test records or test plans can
be stored or transferred to and from a PC via the available interfaces (RS-232C port,
USB port, USB Flash drive port).
Transformer Test Voltage
To prevent an accidental wrong test-lead hook-up (e.g., when the operator reverses H and
X leads), the ATRT-03 S2 outputs a low-level test voltage to verify the hook-up condition
before applying the full test voltage to the transformer. Three test voltages (8 Vac, 40 Vac,
100 Vac) allow the ATRT-03 S2 to test CT’s and PT’s, as well as power transformers.
Auto-Detect Transformer Configuration
The ATRT-03 S2 can automatically detect 130 specific vector groups for different transformer types defined by ANSI, CEI/IEC, and Australian standards.
Automate
Transformer Test Plans
The ATRT-03 S2 can store up to 128 transformer test-plans in its Flash EEPROM. A test-plan
is comprised of the transformer nameplate voltages for each tap setting. The calculated
turns-ratio based on the nameplate voltages is compared with the measured turns-ratio. By
recalling a test plan, a transformer can be quickly tested and turns-ratio Pass/Fail reports
can be reviewed. Test plans can be created with the PC software and can be transferred to
the ATRT-03 S2 via the available interfaces (RS-232C port, USB port, USB Flash drive port).
Test Record Storage Capabilities
Up to 112 test records can be stored in the ATRT-03 S2’s Flash EEPROM memory. Each
test record may contain up to 33 turns-ratio, excitation current, phase angle and name
plate voltage readings. Test records can be recalled locally or transferred to a PC via the
available interfaces (RS-232C port, USB port, USB Flash drive port).
USB Flash Drive Interface
A built-in USB Flash drive interface provides a convenient method for transferring test
plans and test records to or from a USB Flash drive. The user can store up to 999 transformer test plans on a USB Flash drive. Test plans can be transferred from a PC to a USB
Flash drive, and then a specific test plan on the USB Flash drive can be transferred to
the ATRT-03 S2’s internal Flash memory. Up to 999 test records from the field can be
stored on a USB Flash drive. Test records stored in the ATRT-03 S2’s internal memory
can also be transferred to a USB Flash drive. The supplied PC software can then be used
to view the test records stored on the USB Flash drive.
Computer Interface
In computer-controlled mode, the unit can be controlled via the RS-232C or USB port
using the supplied PC software (Transformer Turns-Ratio Analyzer application provided
with each ATRT-03 S2). This Windows® XP/Vista-based software can be used to run a test
and to store test results on a PC. Test results can also be exported to Microsoft® Excel.
Thermal Printer
A built-in 4.5-inch wide thermal printer prints test results in a 14 point font for easy viewing. The printer and paper dispenser are mounted under the front panel for protection.
Transformer Load Tap Changer Control
Transformer tap positions can be changed remotely using the unit’s built-in transformer
load tap changer. This remote-controlled tap changer feature eliminates the need to
manually change a transformer’s step-up and step-down taps.
ATRT-03 S2 Input Power Sources
The ATRT-03 S2 can be powered from a single-phase 100-240 Vac 50/60 Hz power
source. A built-in safety ground detection circuit can detect and display a ground fault
problem with the AC input source.
ATRT-03 S2
Connections
TM
User Interface
The ATRT-03 S2 features a back-lit LCD screen (64 x 128 dot graphic) that is viewable
in both bright sunlight and low-light levels. The test results screen displays the transformer turns-ratio, excitation current, phase angle, and percentage error. The unit is
controlled via a rugged, 16-key, membrane keypad and a digital rotary switch.
Automatic Three-Phase Turns-
2
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