• Used for testing single phase power and
  distribution transformers.
• Design based on precision bridge measuring technique.
• Available in hand-cranked or line-operated models,
  these units provide unmatched accuracy (±0.1%) in a
  portable design.
• Rack-mounted model is suitable for routine production
  testing by transformer manufacturers or repair shops.
  This unit is line-operated.
• Line-operated model for shop or field testing is
  packaged in a rugged, metal case.
• Measures highly sensitive turn ratios up to 129.99:1. An
  optional auxiliary transformer extends this ratio range to
  329.99:1.

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 auxiliary 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%.

Applications
The single phase models are primarily used for testing single-phase power and distribution transformers, for low ratio readings up to 129.99:1, or up to 329.99:1 with an auxiliary transformer. They also can be used to test three-phase transformers by connecting and testing each phase separately.

Specifications

Output
8 V, 50/60 Hz. Line-operated models supply up to 5 A for testing specialty power transformers having a high ratio and a low secondary voltage.
Metering
Four decade dials.

Additional Specifications

The auxiliary transformer includes all the necessary
cables for connection to the TTR set and the
transformer under test.

Dimensions
8" (H) x 13" (W) x 10" (D)
203mm (H) x 330mm (W) x 254mm (D)

Weight
13 lb (5.9 kg)

Auxiliary Transformer

A Calibration Certificate of Turn Ratio Accuracy traceable to the NIST is furnished with each calibration reference transformer, providing accuracies of ±0.05%.

Dimensions
8" (H) x 14" (W) x 10" (D)
203mm (H) x 356mm (W) x 254mm (D) mm

Weight
11 lb (5.0 kg)

Calibration Reference Transformer

Phone: 61 2 4353 4644 

Mobile: 0412 678 925