Transformer Ohmmeter

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Transformer test equipment

Transformer Ohmmeter

MTOU3

Three-phase Winding Resistance Ohmmeter

Three-phase winding resistance ohmmeter for electro-mechanical testing of power, distribution, and instrument transformers

The MTOU3 uses a safe, one-time connection for complete winding resistance assessment of power, distribution, and instrument transformers with automatic adaptive demagnetisation, eliminating the risk of tripping system protection when the transformer is put back into service.

Perform vector confirmation, winding resistance, and demagnetisation tests with the same one-time lead connection.

Guided by color-coded leads and extendable clamps with on-screen vectors that match the transformer nameplate, the easy-to-follow setup ensures the right result the first time - just click start!

Auto vector confirmation before every test ensures that the proper transformer vector is selected.

Maximised productivity
Increased safety
Confidence in test connections

MTOU3 Datasheet Basic
MTOU3 Datasheet Expert

MTO250

50 A transformer ohmmeter

Capable of testing transformers up to 1000 MVA
DC test current up to 50 A maximum
Integrated demagnetisation 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 MTO250 50 A 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, and rotating machine windings, and it 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.

MTO250 Datasheet

MTO106