Transformer Turn Ratio Tester

A) Hand held TTR

  • Tests turns ratio, phase displacement, excitation current, vector group, winding resistance and polarity.
  •  Fully automatic; fast; easy-to-use; handheld; robust; lightweight.
  •  Battery powered with power-saving and shutdown function.
  •  Alphanumeric keyboard.
  •  RS232 for data transfer and printing.
  •  Stores 200 test results and 100 user-defined transformer test settings.

The latest Transformer Testing Equipment 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 functions, such as winding resistance and polarity. These functions, as well as the phase angle measurement function, can be switched off when not required.

With a turn ratio of 20,000:1, the TTR100 offers the highest turns ratio accuracy in the industry of 0.1%. The TTR100 features special software capabilities.

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  •   Fully automatic; fast; easy-to-use; robust; lightweight.
  •   Battery powered.
  •   Tests turns ratio, excitation current, and polarity.
  •   Simple, one-button operation.
  •   Quick-start guide on front panel.
  •   Operator-selectable languages.

The Megger Transformer Testing Equipment TTR25 is an automatic hand-held battery operated transformer turns ratio test set.

It is used to measure the turns ratio, excitation current and polarity of windings in single- and three-phase distribution and power transformers (tested phase by phase), potential & current transformers, and tapped transformers.

The unique design of the TTR25 allows the user to operate the test set while holding it in one hand. It effectively eliminates the user from having to kneel or bend down to operate the instrument and speeds up testing time.

Realizing the extreme environments in which the TTR25 must operate, special attention has been paid to making it extra rugged, with a high impact, shock resistant case, yet incredibly lightweight at a mere 870 g (1.9 lbs).

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  •  Single- and three-phase transformer testing.
  •  Fully automatic, fast, easy-to-use, robust, lightweight.
  •  Battery powered.
  •  Tests turns ratio, excitation current, and polarity.
  •  Simple, one-button operation.
  •  Quick-start guide on front panel.

The Megger Transformer Testing Equipment TTR20 is an automatic, hand-held, battery operated transformer turns ratio test set.

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B) Hand cranked TTR

  •  Used for testing single phase power and distribution transformers.
  •  Design based on precision bridge measuring technique.
  •  Unmatched accuracy (±0.1%) in a portable design.

The Single Phase Transformer Testing Equipment 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 instrument 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%.

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  •   Stand-alone or remote-control operation.
  •   Accurately measures ratio, phase deviation and excitation current.
  •   Field upgradeable without compromise to calibration.
  •   Built-in capability for storing and downloading test results in an XML format, via RS-232, Ethernet or USB ports (depending on model).
  •   Works in the presence of high interference/high voltage.
  •   Highest ratio measurement (45,000:1); highest accuracy (0.1%).
  •   Displays % error vs. name plate with pass/fail limits.

The Transformer Testing Equipment TTR300 Series of three-phase transformer turns ratio test sets are designed to measure the turns ratio of power, instrument, and distribution transformers in a substation or manufacturing environment. A rugged and robust design makes these instruments well suited for use in a variety of harsh environments. Our leads are specially designed to provide the necessary flexibility needed in cold weather.

The Transformer Testing Equipment TTR300 Series are ideal for use by power transformer manufacturers. Their 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. This test also includes a pass/fail limit of individual ratios.

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Transformer winding resistance meter

A) Single Phase – MTO 210

  • Direct 2-channel digital reading (1 µΩ to 2000 Ω).
  •  DC test current up to 10 A maximum.
  •  0.25% measurement accuracy.
  •  Integrated demagnetization feature.
  •  Tests operation of on-load tap-changers.
  •  Very fast auto safety discharge circuit.

The Transformer Testing Equipment MTO210 transformer ohmmeter is a line-operated, field-portable instrument designed specifically to measure the dc resistance of all types of magnetic windings safely and accurately. It can test transformers and rotating machine windings and perform low-current resistance measurements on connections, contacts and control circuits.

The Transformer Ohmmeter is extremely useful when testing the windings and contact resistance of tap-changers with “make-before-break” contacts and voltage regulators. This action will check for pitted or misaligned contacts as the instrument will give an indication if either condition occurs.

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B) Three phase

  • Automated 8-terminal/6-winding measurement capability.
  •  Simultaneous winding magnetization.
  •  Tests operation of on-load tap-changers.
  •  Built-in auto-demagnetization feature.
  •  Automatic discharge.
  •  Power DB software (MTO330).

The Transformer Testing Equipment MTO 300 series delivers full eight-terminal/six-winding resistance measurement capability. It is designed to save time for the user by testing all normal 6 windings without having to disconnect and reconnect leads during testing.

The Transformer Testing Equipment MTO3xx series also shares the Megger TTR300 series lead set. Users who test both turns ratio and winding resistance can save time and money since only one lead set is needed to connect to the transformer.

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  •   Capable of testing transformers up to 1000 MVA.
  •   DC test current up to 50 A maximum.
  •   Integrated demagnetization feature.
  •   Computer control and internal data storage.
  •   Validates proper operation of on-load tap-changers.
  •   Protected against accidental current lead disconnection (through potential leads).

The Transformer Testing Equipment MTO250 Transformer Ohmmeter is a line-operated, field- portable instrument designed specifically to measure the resistance of all types of magnetic windings safely and accurately. It tests transformers, shunt reactors, rotating machine windings and performs low resistance measurements on connections, contacts and control circuits.

The dual set of potential inputs enables the resistance measurement of either two primary, two secondary windings, or of a primary plus a secondary winding simultaneously. This dual reading, dual injection characteristic, is a highly efficient method of completing tests in a timely manner.

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