Measurement of insulation losses is performed during periodic maintenance and inspection of high voltage equipment like power transformers, bushings, motors, generators, etc. HAEFELY has designed rugged and portable units for testing at power line frequency to measure and record power factor (cos φ), dissipation factor (tan δ), and all other relevant values of impedances (capacitive, inductive, and resistive). Damage to or changes in the insulation material are detected rapidly and reliably.
