• Generates its own 3-phase transformer test voltage from single-phase AC or DC Power input
• Capable of detecting 130 different 3-phase transformer types defined by ANSI, IEC, and Australian standards plus phase shifting transformers
• 64 x 128 graphic LCD screen
• Store up to 128 transformer test-plans in Flash EEPROM
• Store up to 112 test records in Flash EEPROM
• Built-in USB Flash Drive Interface
• Computer Interface (RS-232C and USB Port)
• 4.5 Inch thermal printer
• Built-in transformer load tap changer
• Powered from a single phase 100-264 Vac 50/60 H

Vanguard’s new TRI-PHASE is a true 3-phase transformer turns ratio tester designed to conform to the IEEE C57.12.90 measurement method. The TRI-PHASE outputs a 3-phase excitation test voltage to the three transformer primary windings. The induced 3-phase secondary voltages are sensed and the transformer turns ratio is calculated. The TRI-PHASE is capable of measuring turns ratios from 0.8 to 15,000. The 3-phase excitation current, phase angle readings along with the turns ratios are displayed on the built-in LCD. Since a 3-phase voltage is used to excite the transformer windings, the TRI-PHASE can detect and measure turns ratios of any transformer type. The TRI-PHASETM can easily measure the turns ratio of phase-shifting transformers where other 3-phase transformer ratio testers cannot.

Transformer Test Voltages

The Tri-Phase generates three-phase transformer

test voltages from a single-phase AC or

DC power source. Three test voltages (8 Vac, 40

Vac, 100 Vac) allow the Tri-Phase to test CT’s

and PT’s, as well as power transformers.

Auto-Detect Transformer

Confi guration

The Tri-Phase can automatically detect 130 different

transformer types defi ned by ANSI, CEI/

IEC, and Australian standards, as well as phaseshifting

transformers.

Internal Test Record

Storage

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

Phases’s Flash EEPROM. 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 Tri-Phase 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 to derive

the percentage error and Pass/Fail results.

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

Tri-Phase via the available interfaces (RS-232C

port, USB port, USB Flash drive port).

Part number TRI-PHASE Tri-Phase, cables, and PC software

Part number TRI-PHASE CASE Tri-Phase shipping case

Part number Paper-TP4 Thermal printer paper