The Vanguard TRI-PHASE is a true three-phase transformer turns-ratio tester (TTR), designed to conform to the IEEE C57.12.90 measurement standard, generates and outputs a three-phase excitation test voltage to the three transformer primary windings. The induced three-phase secondary voltages are sensed, and the transformer turns-ratio is calculated.
The Vanguard TRI-PHASE True Three Phase TTR can measure turns-ratios from 0.8 to 15,000. The three-phase turns-ratios, excitation current, and phase angle readings are displayed on the unit’s LCD screen.
Since a three-phase voltage is used to excite the transformer windings, the Vanguard TRI-PHASE can detect and measure turns-ratios of any transformer type, including phase-shifting transformers.
The Vanguard TRI-PHASE can be used as a stand-alone unit or can be computer-controlled, and 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 field on the unit’s built-in 4.5-inch wide thermal printer.
The Vanguard TRI-PHASE can store up to 112 test records and 128 test plans in Flash EEPROM. 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).