Transformer ohmmeter from Megger
November 2011
Electrical Power & Protection
Incorporating the latest test technology and field experience, the new MTO210 transformer ohmmeter from Megger measures the DC resistance of all types of magnetic winding quickly, safely and accurately. The unit is also ideal for checking the operation of on-load tap changers, which are one of the most common causes of transformer problems.
Timesaving features include dual channel operation, which allows the resistances of transformer primary and secondary windings to be measured simultaneously, and bidirectional current output, which allows users to take advantage of any existing magnetisation in the winding core to aid rapid current stabilisation.
When used to check the contact resistance of make-before-break tap changes and voltage regulators, the ohmmeter provides fast, dependable indication of pitted or misaligned contacts. For added safety the circuitry automatically discharges the winding when the test is completed, if a lead is accidentally disconnected, or in the event of a power failure.
The MTO210 also offers facilities for demagnetising winding cores before or after resistance testing is carried out, and it can be used as a standalone core demagnetiser. Remaining magnetisation will affect frequency response measurements on the transformer and may also cause high in-rush currents when the unit is put back in service.
Test results are shown on large LCDs, and can also be stored in the instrument’s internal memory for later printing or downloading. The ohmmeter is fully compatible with Megger’s PowerDB Lite software, which provides uniform test result analysis and reporting features for all types of power equipment tests. Weighing less than 13,6 kg, and built into a rugged case with a hinged lid and carrying handle, it is equally suitable for use on site or in the workshop.
For more information contact Stuart Ashton, Surgetek, +27 (0)11 792 1303, [email protected], www.surgetek.co.za
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