The Megger TTRU3 True 3 Phase Transformer Turns Ratiometer is a lightweight (6.5 kg), high-accuracy (±0.05%) device for testing power, instrument, and distribution transformers. It employs patented 3-phase step-up/step-down testing (0.8-50,000 ratio range) to eliminate test voltage selection, offering up to 5x faster testing than single-phase methods.
The TTRU3 measures turns ratio, excitation current (0.1 mA-2 A), phase shift (0-360°, ±0.05°), polarity, winding balance, and phase deviation, with automatic vector group detection for validating transformer configurations. Housed in a ruggedized case (IP51, IP67 in transit), it features a 7-inch touchscreen, USB data storage for up to 2,000 results, and a 2-inch thermal printer. Safety is ensured via CE certification (IEC 61010) and automatic checks.
The kit includes the TTRU3 unit and a canvas bag for leads, requiring 3-phase shielded test lead sets (5-30 m), with optional extension leads and software (PowerDB, One Touch, Custom App). No warranty is specified, making it ideal for efficient transformer diagnostics in field and lab settings.
