How South African People Perform Winding Resistance Testing In Power Transformers?

Power transformers users in South Africa use precision and reliable test equipment and methods to protect their transformer equipment against costly repairs.

Transformers are highly reliable devices that serve many industries and homes if maintained and serviced on regular basis. Though the cost of transformers is very high, but when you maintain them properly, they can be run for years and reveal the fact why it is worth to invest in them. You can prevent sudden failure or breakdown of the components of the transformer by using proper and accurate testing equipments and methods.

We got a list of things that will explain winding resistance testing that is done in power transformers-

Using a dedicated transformer ohmmeter to make precision winding resistance measurements

The instrument is designed with transformer resistance testing is recommended by experts to achieve more reliable results in safe and quick manner, especially with large transformers.

Demagnetizing the transformer core after testing is crucial as a transformer returned to service with a magnetized core can damage inrush current.

The testing equipment suppliers have recently brought a latest multifunction tester that offers extensive range of tests for transformers, including winding resistance tests, turn ratio tests, tan delta measurements, and leakage reactance measurement.

These latest testing equipments can also do the job of basic measurements on circuit breakers, protection relays, and other equipments that are used in power distribution networks.

Deciding the right test current to use in a transformer when measuring winding resistance

It is usually beneficial to use higher test current as it minimizes the noise effect on measurements. You may get inconsistent results with successive measurements when the test current is too low.

What common faults can be seen with winding resistance tests?

Some shorted and open turns, issues with tap-changer contacts, defective internal connections are few faults that can be detected using resistance tests.

These things will help the people of South Africa to test power transformers winding resistance in professional way.