Phenix Technologies’ Model PATTR-03 is a microprocessor-based, automatic, single and three-phase transformer-turns-ratio tester. The unit is portable, lightweight and ruggedly built for testing transformers in the field or in a laboratory setting.

The PATTR-03 determines transformer turns ratio by precisely measuring the voltages across unloaded transformer windings and then displays the ratio of these voltages (ratios range from 0.8 to 15,000). The unit self-calibrates before each measurement to ensure turns-ratio accuracy. The PATTR-03 requires no calibration or temperature compensation.

To prevent an accidental wrong test lead hook-up, the unit uses a low level test voltage to verify hook-up condition before applying a full test voltage to the test specimen. The unit will run a specific test for each transformer type (ie: single phase, delta to Y, Y to delta, delta to delta or Y to Y) without the need to switch test hook-up cables.

In addition to measuring a transformer’s turns ratio, the PATTR-03 also measures a transformer’s excitation current and its phase angle. It displays the turns-ratio, excitation current and turns ratio accuracy on a 20 character by 4 line back-lighted LCD display. Test results can be immediately printed on a built in 4.5 inch, thermal printer. The PATTR-03 lets users enter a transformer’s nameplate voltages for the turns-ratio calculation and also compares the test result with the calculated ratio and prints out the percent of error for each test. This feature eliminates any error otherwise caused by manual calculation. Up to 200 transformer test records can be stored in Flash EEPROM. Each test record may contain up to 99 ratio, excitation current, phase angle and nameplate voltage readings. Through the RS232 interface, test results can be recalled and downloaded to an IBM-® compatable PC. A Windows based software package is included with the unit. The software allows the operator to test, store and print test results.

Users can also create a test plan for a specific transformer. The test plan comprises transformer nameplate voltages for each tap setting. Computed turns ratio is based on nameplate voltages and used later to compare with measured turns ratio.

Optional Features. 
The Tap-Changer Remote-Control Box permits users to change transformer taps remotely from the PATTR-03. This eliminates the need to change the transformer’s step-up and step-down taps by hand.

Sample Built-In Printout 

Sample Printout

A standard feature of the PATTR-03 is the built-in printer for hard copy of test results. A sample printout is displayed here. Windows-based interface program is also provided.

Standard Software 
The PATTR-03 comes standard with Windows-based software. Field test results can easily be downloaded and stored. Computer generated reports are also a feature of the software.

Standard Software

Control Panel Layout.