Megger TTR330 Three Phase Transformer Turns Ratio Tester


The TTR330 offers a user interface which allows the operator to interact with the PowerDB ONBOARD software system via full QWERTY and navigation keypads as displayed on an 8.4” VGA bright-color touchscreen. One of the primary benefits of this interface is that it displays the actual test form on the screen.



The TTR300 Series of three-phase transformer turns ratio test sets are designed to measure the turns ratio of power, instrument, and distribution transformers in a substation or manufacturing environment. A rugged and robust design makes these instruments well suited for use in a variety of harsh environments. Our leads are specially designed to provide the necessary flexibility needed in cold weather.

The TTR300 Series are ideal for use by power transformer manufacturers. Their unique testing procedures and storage capability allows an operator to set up and test difficult three-phase transformers (with multiple tap changers and bushing CTs) in a fraction of the time than it used to take with other TTRs. This test also includes a pass/fail limit of individual ratios.

The TTR330 offers the following:

  • Fully automatic operation (stand-alone or remote-control) with user interface via on-screen customizable test forms
  • Integrated PowerDB ONBOARD allows for data analysis and trending while in the field without the use of an external computer
  • Ability to perform and display magnetic balance
  • Built-in USB port and optional USB printer
  • Built-in capability for storing test results, in an open XML format, to either internal memory or to an external USB storage device
  • Full 8.4” touchscreen VGA color display

TTR330: stores up to 100,000 data sets in the field for later retrieval. Test results can be printed on an optional in-lid printer (using 8.5” x 11” thermal paper), or the data can later be downloaded to a PC for archiving, analysis and/or printing.


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