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The TTRU3 is an important tool for determining the mechanical condition of transformers. All ratio tests are performed in one instrument, with only one 3Ø lead-set connection. The TTRU3 utilizes the latest 7 inch (180 mm) color touch display, as well as an optional printer so you never lose your results. This is complimented with remote control which can be operated from your PC, as well as the ability to download results to a USB memory device.

  • Guaranteed accuracy ±0.05% from -20°C to +50°C
  • 3Ø test voltage - up to 250V
  • 3Ø step up ratio (patent pending)
  • Phase shifting & zig-zag transformers tested easily and accurately
  • Smallest/lightest 3Ø test set on the market
  • Fast 3Ø tests - less than 10 seconds

 TTRU3 Details


3-Phase Transformer Turns Ratio Test Sets

The TTR300 Series of three-phase transformer turns ratio test sets is 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.

  • Store and download test results in XML format, via RS-232, Ethernet or USB ports (depending on model)
  • Works in the presence of high interference/ high voltage
  • Capable of measuring phase-shifting transformers
  • Highest ratio measurement (45,000:1)
  • Displays % error vs. name plate with pass/fail limits
  • Capability for automatic vector detection when testing via PowerDB

TTR300 series Details


Handheld TTR

  • Single- and three-phase transformer testing (up to 1 MVA)
  • Lightweight, handheld
  • Battery powered, line rechargeable
  • Tests turns ratio, phase displacement, excitation current, winding resistance and polarity
  • RS232 for data transfer and printing
  • Stores 200 test results and 100 user-defined transformer test settings

The Megger TTR100-1 is an automatic handheld, battery operated transformer turns ratio test set used to measure the turns ratio, excitation current, phase displacement, dc resistance and polarity of windings in single- and threephase distribution transformers (tested phase by phase), potential & current transformers, and tapped transformers.Deviations in the mentioned measurements will quickly indicate problems in transformer windings or in the magnetic core circuits.

The unique design of the TTR100-1 allows the user to operate the test set while holding it in one hand. Realizing the extreme environments in which the TTR100-1 must operate, special attention has been paid to making it extra rugged, with a high impact, shock resistant case, yet incredibly lightweight at 3.3 lb. (1.5 kg). It weights less than any other commercially available instrument on the market.

Its rugged and robust design makes this instrument well suited for use in a variety of harsh environments. The TTR100-1 is particularly suited for testing in substations and transformer-manufacturing environments where testing single and three-phase transformers can be performed. The TTR100-1 provides reliable results, helping the user in determining the condition of the transformer under test. It features a high contrast LCD screen which can be seen in bright or ambient light.

 TTR™100-1 Details


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