Dielectric Response Analysis
The condition of the insulation in rotating machines can be determined by measuring the dielectric characteristics of stator windings. Compared with classic measurements at just one frequency, measurements over a broad frequency range offer significant advantages. With these measurements, deteriorated or insufficient hardened parts of the insulation, moisture and other types of soiling can be identified more effectively.
Deviating or changing values, for example due to a comparison of various phases or with prior measurements, can indicate potential changes within the insulation. Aging processes, partial discharges in the insulation, or moisture ingress increase the dissipation factor, particularly in the low frequency range.
This diagnosis allows an early detection of impending failures. This enables timely corrective action to be initiated before the machine suffers major damage.