Megger 550005B Offers

The TTR Test Set Aids in Identifying:

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

The TTR set operates on the principle that the voltage ratio of transformer at no load is practically equal to the true turns ratio.

The major source of error in a transformer is a primary impedance drop due to magnetizing current, which is kept to a minimum by excitation at a fraction of rated voltage.

When measuring the turns ratio of distribution and power transformers, the accuracy is well withiun 0.1%.

Features and Benefits

• Provides unmatched accuracy (±0.1%) in a portable design
• Packaged in a rugged, compact case
• Measures highly sensitive turn ratios up to 129.99:1. An optional auxiliary transformer extends this ratio range to 329.99:1

Applications

The single phase model is primarily used for testing single-phase power and distribution transformers, for low-ratio readings up to 129.99:1, or up t 329.99:1 with an auxiliary transformer. It can be used to test three-phase transformers by connecting and testing each phase seperately.