DFR measurement for general insulation testing and diagnostics
With an ageing power component population, today’s electrical utility industry faces a tough challenge as failures and consequent repair and revenue loss may result in major costs. Transformers and their bushings are mission critical components in the electrical grid. The need for reliable diagnostic methods drives leading experts to evaluate new technologies that improve reliability and optimise the use of the power network.
Dielectric Frequency Response/ Frequency Domain Spectroscopy (DFR/FDS) measurement is a technique or methodology for general insulation testing and diagnostics. In comparison with 50/60 Hz dissipation factor measurements, DFR measurements have many advantages.
- Transformers and their bushings have become the most mission critical components in the electrical network on a plant, in a distribution network and on the national grid.
- The insulation properties are a good indicator of power system component condition and knowing the condition helps to avoid potential catastrophic failure.
- DFR measurement is a technique for general insulation testing and diagnostics and offers many advantages over 50 Hz dissipation factor measurements.
Bushing insulation diagnostics based on dielectric response
By M Ohlen and P Werelius, Megger
Electricity+Control, August 2011 (pgs 50 – 59)
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