WRT-10 - Winding Resistance Tester

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

Application

Winding resistance testing is an important part of power transformer maintenance of a manufacturing quality assurance program. Transformers and large motors are subject to vibrations, overloading and environments with large temperature variations. Winding resistance measurements can assure that the connections are made correctly and that no opens of shorts are present. Tap changers of power transformers are a particularly critical element of a power system. The WRT is very effective in detecting Tap changer abnormalities.

The WRT-10 injects a DC current through the windings & measures the voltage drop. The instrument calculates the resistance R = E / I. The challenge in winding resistance measurements is that the voltage across an inductor is defined by V = L (di/dt), where L is the inductance of the winding & (di/dt) is rate of change of current. Therefore small changes in the current, as may be caused by ripple or poor regulation, can make it impossible to measure the DC resistance. The highly regulated and filtered current output of the WRT-10 allows for the winding resistance measurements on very large power transformers.

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