September 2004
Page 1
Introduction
The Digital Winding Resistance Reporter, Model DWR-
10, provides accurate, high-resolution measurement of
transformer winding resistance.
Application
Transformers have many internal connections that can
become loose as a result of poor quality, vibration from
years of service, or from through faults.
The DWR-10 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
resistance 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.
Chapter
1
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