Transformer Turns Ratio Tester (TTR)

Rent the Megger MWA330A 3-Phase TTR, Winding Resistance Analyzer

Megger MWA330A 3-Phase Transformer Turns Ratio and Winding Resistance AnalyzerThe Megger MWA330A 3-Phase Transformer Turns Ratio and Winding Resistance Analyzer is an advanced 3-phase transformer test system that provides complete ratio, phase and winding resistance measurements with only one 3-phase lead-set connection.


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Once connected, the Megger MWA330A performs DC resistance measurements on all high- and low-side windings without reconnection. It has an 8-terminal/6-winding resistance measurement capability and doesn’t need any inter-connected boxes, allowing for testing on all 6 windings without having to disconnect and reconnect leads.

AEMC DTR 8510 Ratiometer Tests Power, Voltage and Current Transformers

AEMC DTR 8510 High-Performance RatiometerThe AEMC DTR 8510 High-Performance Ratiometer is a portable digital ratio meter for testing power, voltage and current transformers.



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When connected to an uncoupled transformer, the AEMC DTR 8510 accurately measures the primary-to-secondary transformation ratio, while also indicating the polarity and excitation current.

Rent the Raytech TR-SPY Mark III for Precision Laboratory Measurements

Raytech TR-SPY Mark III Three Phase TTR (Transformer Turns Ratio)Transformers are simple devices in concept, with two coils of insulated wire wound in close proximity on an iron core (windings). One wire (primary) is connected to a power source, such as the utility or a generator. The other wire (secondary) provides power, “transformed” in some way, to the load. Energy transfer from one wire to the other is through magnetic induction. 

Rent the Megger TTR310 to Test Difficult Three-Phase Transformers

Megger TTR310 Three-Phase Transformer Turns Ratio Test Set The Megger TTR310 Three-Phase Transformer Turns Ratio Test Set is designed to measure the turns ratio of power, instrument, and distribution transformers in a substation or manufacturing environment. A rugged and robust design makes the instrument well suited for use in a variety of harsh environments.



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The Megger TTR310 is ideal for use by power transformer manufacturers, as the test sets unique testing procedures and storage capability allows an operator to set up and test difficult three-phase transformers (with multiple tap changers and bushing CTs) in a fraction of the time than it used to take with other TTRs.

Rent the Vanguard TRF-100 Automatic Three Phase TTR from Protec

Vanguard-TRF-100a.jpgThe Vanguard TRF-100 Automatic Three Phase TTR is a microprocessor-based, automatic, three phase, transformer turns-ratio tester.

A lightweight, portable unit designed for testing transformers at utility power substations, the TRF-100 Automatic Three Phase TTR determines the transformer turns-ratio using the IEEE C57.12.90 measurement method.

A Comparison of Vanguard’s ATRT Series of Transformer Turns-Ratio Testers

Vanguard ATRT-03 Automatic Three Phase TTRWhen the windings of a transformer develop shorts, opens or other defects, the effective number of turns may change. This may result in the change of the ratio of the windings and affect the power conversion of the transformer. Ratio changes can cause severe power losses and instability in the electrical system. It is a good idea to regularly test the ratio of transformers to ensure efficient power conversion. Regular preventive maintenance also allows technicians to spot developing faults and stop them before they get out of hand.