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Zensol new instrument for OLTC testing

By Randy Hurst, Senior Editor

NFPA 70E Training

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According to CIGRE A2.34, the dynamic resistance measurement or DRM (OFFLINE) is a test that offers diagnostics for several diverter or selector switch malfunctions such as: contact problems, broken springs, broken transition resistors, poor contact pressure, inadequate transition time, momentary open circuit, and synchronism motion issues.

Zensol’s DRM principle

Tap windings are powered with a DC voltage source. The current fluctuations are recorded during the switching process. The schematic below shows the principle of the dynamic resistance measurement.
TAP-4-PLUS the newest instrument for OLTC testing

“The TAP-4-PLUS with TAP-DRM accessory can perform dynamic resistance, vibration recordings, and motor current at the same time.”

Read full article in the Reliable Power Testing Special Edition

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