Transformer Ohmmeter Features Fast Test Technology

Megger's new MTO210 transformer ohmmeter is suitable for measuring the DC resistance of magnetic winding and for checking the operation of on-load tap changers. Incorporating patented Fast Test technology, the MTO210 is said to make it easy to measure the DC resistance of all types of magnetic winding rapidly, safely and accurately. The Fast Test technology has been specifically developed to stabilise the test current in the shortest possible time, thereby reducing test times.

Further time-saving features include dual-channel operation, which allows the resistances of transformer primary and secondary windings to be measured simultaneously, and bi-directional current output capabilities that allow 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 MTO210 provides a fast indication of pitted or misaligned contacts. As a further aid to the testing of tap changers - one of the most common causes of transformer problems - a remote probe is available that allows the user to operate the tap changer while the tester is in operation.

To ensure safe operation, circuitry is included that automatically discharges the winding or windings under test when the test is completed, if a lead is accidentally disconnected or in the event of a power failure. Provision is also made for driving a warning beacon and for interlocking the operation of the instrument with a safety fence, for example. The MTO210 offers facilities for demagnetising winding cores before or after resistance testing is carried out and it can also be used as a standalone core demagnetiser. It offers a wide resistance range, which allows it to be used for the heat-run testing of many types of transformers.

Test results are shown on large liquid-crystal displays and can also be stored in the instrument's internal memory for later printing or downloading. The MTO210 is compatible with Megger's PowerDB software, which provides uniform test result analysis and reporting features for all types of power equipment tests. Weighing less than 13kg and built into a rugged case with a hinged lid and carrying handle, the MTO210 is suitable for use on site and in the workshop. It is supplied complete with a set of 10m test leads, while 20m accessory leads are available as an option. All leads feature Kelvin clamps, which eliminate the need for bushing adaptors.

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