Winding Resistance

Transformers have many internal connections that can become loose as a result of poor quality, vibration from years of service, or from faults.

Winding resistance provides valuable information about the condition of the transformer windings by measuring the DC resistance in the windings. The winding resistance test also checks for correct transformer connections and changes to the tap ratio.

The test is performed by injecting DC current through the winding and measuring the resulting voltage drop.

Test results are an important tool in preventing unplanned outages and premature failures. A winding resistance test should be applied as part of a preventive maintenance program or as a routine test in a manufacturing process.

The winding resistance test is particularly valuable for transformers with on-load tap changers, because they have hundreds of bolted connections and moving contacts.

WRT-10 - Winding Resistance Tester

The WRT-10 is a high performance winding resistance tester designed for Power Transformer and large motor applications. (more)

WRT-10D : Winding resistance tester with Demagnetisation circuit

The WRT-10D is a High performance & High accuracy winding resistance tester, this unit has a built in Demagnetisation circuit to automatically or manually, demagnetize the transformers and avoid situations where the Current Transformer could cause the protection circuits to trip when re-energizing. (more)

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