Hand-held TTR100
Single Phase Turns Ratio Test Set

The latest TTR available from Megger is the TTR100, a handheld, robust, lightweight and battery operated instrument. This TTR will complement several existing Megger transformer test products and will offer switchable functions, such as winding resistance and polarity. It is the only instrument in the market place that displays both tested and expected polarity results. With a turns ratio of 20,000:1, the TTR100 offers the highest turns ratio accuracy in the industry of 0.1%.

The TTR 100 is used to perform tests in the field, as well as in manufacturing facilities and repair centers. Improved testing productivity is achieved in these environments through the efficient collection and storage of large amounts of data, which can then be uploaded to a PC database for analysis and test results reporting.

Model 550005B

Megger Single Phase TTR
Single Phase Transformer Turns Ratio Test Set

The Biddle Single Phase TTR, Transformer Turns Ratio Test Set, measures the turns ratio and exciting current of windings in power, potential and current transformers. Deviations in turns ratio readings indicate problems in one or both windings or the magnetic core circuit.

The TTR test set aids in identifying:
• Shorted coils
• Open circuits
• Incorrect connections
• Internal faults or tap-changer defects in step regulators as well as in transformers.

The single phase model is available in either hand-cranked or line-operated versions and measures highly sensitive turns ratios of up to 129.99:1 with accuracy of ±0.1%. An optional auxilary transformer extends the ratio range to 329.99:1.

The TTR set operates on the principle that the voltage ratio of the 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. By employing a design that meets both of these conditions along with the use of a null balance system, the turns ratio of a transformer can be determined accurately.

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

Please Note: All prices subject to change without notice
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