Hipotronics 2796 - Three Phase 250V Transformer Turns Ratio Meter

A close collaboration with major transformer manufacturers has lead to the new HIPOTRONICS 2796 Transformer Turns Ratio Meter. It combines mobility and user friendly handling with unmatched accuracy of up to 0.03%. The higher test voltage of 250V together with the high precision assures authentic results especially on large power transformers. Advanced analysis features like trending allow the user to detect problems at an early stage. The automatic winding connection identification feature aids to find the correct transformer configuration. With the optional arbitrary phase shift software special transformers with irregular vector groups can also be measured.

During production and also in the field the TTR2796 is a highly valued diagnostic instrument. Within half a minute after connecting the measurement cables to the terminals of the transformer, the voltage ratio, turns ratio, ratio deviation, excitation current and phase deviation are displayed.

Applications

Turns ratio, voltage ratio, phase displacement and excitation current measurements according to ANSI, IEC and Australian standards on:

• Power- and distribution transformers
• Special transformers; like phase shifting-, rectifier-, arc-furnace- and traction- transformers.
• Instrument transformers

Increased Test Voltage to 250V

Working closely together with major transformer manufacturers has revealed that an increased test voltage gives better results when measuring turns and voltage ratio of large power transformers. Comparison measurements on a 350MVA transformer with tertiary winding show significantly improved accuracy with higher test voltage.

Measuring Arbitrary Phase Shifts

Arbitrary phase shifts or those that do not follow the 30° phase steps between the primary and secondary winding are common in special transformers like phase-shifting, rectifier / furnace and traction transformers.

Automatic Winding Connection Identification (AWCI)

The Automatic Winding Connection Identification (AWCI) aids testing of unknown transformer configurations. The AWCI acts like a nameplate guesser and detects the transformer configuration and vector group of the most common three phase transformers.