Megger Biddle 550100 Three-Phase Transformer Turn Ratio(TTR) Megger Biddle TTR Transformer Turns Ratio Test Sets measure the turns ratio and exciting current of windings in power, potential, and current transformers. Deviations in turn ratio readings indicate problems in one or both windings or the magnetic core circuit. The TTR test sets to aid in identifying:

• Shorted coils
• Open circuits
• Incorrect connections
• Internal faults or tap-changer defects in step regulators as well as in transformers.

The three-phase model is a fully automatic, microprocessor-based system with an expanded ratio range of 2700:1 to cover most current and potential transformers with an unmatched accuracy of ?0.1%. The automatic operation reduces test function time to under 10 seconds, providing dramatic cost savings to the user. Additional time saving is gained from the simple switch settings which eliminate the need for manual setup changes.