• Highest ratio: 0.8 - 15,000
• Capable of detecting 130 different 3-phase transformer types defined by ANSI, IEC, and Australian standards
• 3 Test voltages available: 8Vac, 40Vac, 100Vac
• Phase angle and excitation current measuring
• Computer Interface (RS-232C and USB Port)
• USB flash drive interface
• Name-plate turns ratio calculation
• Computed % error based on measured and calculated ratio
• Optional 4.5" thermal printer
• Powered from a single phase 100-264 Vac 50/60 Hz

The Vanguard Instruments ATRT-03 S2 is the third generation, microprocessor-based, automatic, three phase, transformer turns-ratio tester. This light weight, 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 primary windings. The induced secondary voltage is sensed and the transformer turns ratio is calculated. The ATRT-03 S2 is capable of measuring turns ratios from 0.8 to 15,000. The transformer turns-ratio, excitation current, and phase angle readings are displayed on the large LCD. The automatic 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 standalone

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 (128 x 64 pixels) that

is viewable in both bright sunlight and low-light

levels. Test reports can be printed in the fi eld 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 Voltages

To prevent an accidental wrong test-lead hookup

(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

Confi guration

The ATRT-03 S2 can automatically detect 130

specifi c vector groups for different transformer

types defi ned by ANSI, CEI/IEC, and Australian

standards.

Internal Test Record

Storage

Up to 112 test records can be stored in the ATRT-

03 S2’s Flash EEPROM memory. Each test record

may contain up to 99 turns-ratio, excitation

current, phase angle and nameplate 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).

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 turnsratio

based on the nameplate voltages is compared

with the measured turns-ratio to derive

the percentage error and Pass/Fail results. By

using 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).

Part number ATRT-03S2 ATRT-03 S2, cables, and PC software

Part number ATRT-03S2 CASE ATRT-03 S2 shipping case

Part number Paper-TP4 Thermal printer paper