When it comes to choosing a transformer turns ratio tester, TRT Standard series offers some of the most advanced instruments with LCD displays out in the market. Each model measures transformer excitation current and phase shift and performs automatic vector group detection and magnetic balance on three-phase transformers and three-phase autotransformers. Furthermore, they have a built-in true three-phase power source. Because of that, TRT Standard instruments can test transformers with special configurations, such as phase-shifting, rectifiers, arc-furnace, traction transformers, etc.

The instruments can output test voltages from 1 V AC to 250 V AC, depending on the chosen model. A high test voltage of 250 V AC provides more accurate turns ratio testing compared to other turns ratio testers on the market and an extremely low test voltage of 1 V AC enables turns ratio verification of current transformers.

TRT Standard series consists of:

• TRT03 Models (TRT03A, TRT03B, TRT03C) – single-phase voltage up to 100 V
• TRT33 Models (TRT33A, TRT33B, TRT33C) – single and true three-phase voltage up to 100 V
• TRT63 Models (TRT63A, TRT63B, TRT63C) – single and true three-phase voltage up to 250 V

More about model differences can be found under the downloads tab, in brochures and comparison sheets.

A user can create test templates using the DV-TR software and store them in the PC’s memory for later use when in the field.

TRT Standard series models have a built-in tap changer control unit. Consequently, it enables remote control of an on-load tap changer (OLTC) directly from the tester. In order to make the most out of this feature, the DV-TR software can be programmed to do everything automatically – running turns ratio tests, changing OLTC tap positions, and saving results. This option, especially in combination with test templates, significantly facilitates and shortens the turns ratio testing time.