Megger AVTM 55-Jd Handleiding

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Single-phase, Hand-cranked TTR

®

Transformer Turns Ratio Test Set

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Used for testing single phase power and

distribution transformers

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Design based on precision bridge

measuring technique

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Unmatched accuracy (±0.1%) in a

portable design

DESCRIPTION

The 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:

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Shorted coils

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Open circuits

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Incorrect connections

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Internal faults or tap-changer defects in step regulators as

well as in transformers.

The single-phase, hand-cranked model 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%.

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 to 329.99:1 with an auxiliary

transformer. It can be used to test three-phase transformers

by connecting and testing each phase separately.

FEATURES AND BENEFITS

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Provides unmatched accuracy (±0.1%) in a portable de-

sign.

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Packaged in a rugged, compact case.

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Measures highly sensitive turn ratios up to 129.99:1. An

optional auxiliary transformer extends this ratio range to

329.99:1.

SPECIFICATIONS

Output

8 V, 50/60 Hz

Metering

Four decade dials

Turns Ratio Range

0.001 to 129.999

Exciting Current

0 to 1 A (divide by 5 switch for increased resolution)

Accuracy

±0.1%

Dimensions

7.5 H x 14 W x 12 D in. (189 H x 353 W x 302 D mm)

Weight

16 lb (7.3 kg)

Single-phase, Hand-cranked TTR

®

Transformer Turns Ratio Test Set

Product specificaties