Transformer ohmmeter from Megger

Electrical Power & Protection

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

Share this article:

World’s fastest 14-bit arbitrary waveform generator
Vepac Electronics Electrical Power & Protection
The ARB Rider AWG-7000 is the world’s fastest 14-bit arbitrary waveform generator, with a 20 GS/s real time update rate and 14-bit vertical resolution. Thanks to Simple Rider software, it offers best-in-class performances and an easy to use interface.

Read more...

Steam on demand
Electrical Power & Protection
Rental boilers are increasingly popular, offering the convenience of on-demand power and heat without the commitment of a permanent installation. They are an ideal solution while a customer awaits repairs, or only needs a boiler for a particular period, or does not have the capital to invest upfront.

Read more...

High-voltage backup power solutions
Electrical Power & Protection
Businesses are facing increasing pressure to rethink their approach to power. As a result, there’s been a significant uptick in interest in high-voltage installations, either as standalone battery energy storage systems, or as solar installations feeding into battery storage.

Read more...

Rotary friction welding – a first for Tutuka power station
Electrical Power & Protection
Steinmüller Africa has successfully used rotary friction welding in a project with engineering consultant, eNtsa. This innovative technique was applied to fabricating four headers used for high-pressure water heater boiler units installed at Tutuka power station in Mpumalanga.

Read more...

Why it is vital to size soft starters carefully
WEG Africa Electrical Power & Protection
The application of soft starters has become a well-established strategy to improve the uptime and lifespan for motors and mechanical equipment driven by motors, but they need to be chosen carefully.

Read more...

Changeover switch between two power supplies
Schneider Electric South Africa Electrical Power & Protection
Schneider Electric South Africa has unveiled the Resi9 Changeover Switch product range which provides the perfect solution to switch manually between two power supplies or circuits.

Read more...

Partial discharge monitoring solution for MV switchgear
Schneider Electric South Africa Electrical Power & Protection
Schneider Electric South Africa has unveiled its PowerLogic PD100 Partial Discharge Monitoring Solution, designed to be installed on MV switchgear to detect anomalies early, to prevent unplanned downtime.

Read more...

Boiler update at food processing plant transforms production process
Electrical Power & Protection
The replacement of 78 year-old boilers at a Western Cape food processing plant by Associated Energy Services has not only proven to be a worthwhile investment for the client, but has transformed its entire production process.

Read more...

Electrical Power & Protection

Transformer ohmmeter from Megger

Further reading:

Published by Technews