NDLI: Best practices for Dielectric Frequency Response measurements and analysis in real-world substation environment

Content Provider	IEEE Xplore Digital Library
Author	Ohlen, M. Werelius, P. Jialu Cheng Skoldin, J.
Copyright Year	2012
Description	Author affiliation: Megger, Täby, Sweden (Ohlen, M.; Werelius, P.; Jialu Cheng; Skoldin, J.)
Abstract	Modern technology and developments in signal acquisition and analysis techniques have provided new tools for transformer and bushing diagnostics. Of particular interest are dielectric response measurements where insulation properties of oil-paper systems can be investigated. Dielectric Frequency Response, DFR (also known as Frequency Domain Spectroscopy, FDS), was introduced more than 20 years and has been thoroughly evaluated in a number of research projects and field tests with good results. DFR data in combination with mathematical modeling of the oil-paper insulation is proven as an excellent tool for moisture and oil conductivity assessment of power transformers. Dielectric response measurements are usually performed at a much lower voltage level than traditional power frequency tan-delta measurements. Due to this, the signal-to-noise ratio may sometimes be extremely low, especially at low frequencies and when measuring low capacitance objects e.g. bushings and instrument transformers. The interference suppression capability of the test set thus becomes an important parameter when considering different methods and instruments. In this paper investigation of the electromagnetic interference in terms of AC hum currents, induced DC currents and low frequency interference in AC as well as HVDC substations are presented. Solutions to handle these different types and levels of interference are investigated and examples of measurements under those conditions are presented. The paper also covers DFR response analysis using the XY-model. Numerical analysis using COMSOL has been performed and compared with the simplified analytical XY-model to investigate how non-ideal conditions influence geometry parameters and results.
Starting Page	244
Ending Page	249
File Size	831223
Page Count	6
File Format	PDF
ISBN	9781467310192
e-ISBN	9781467310208
DOI	10.1109/CMD.2012.6416421
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2012-09-23
Publisher Place	Indonesia
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Insulation Temperature modeling dissipation factor Interference frequency domain spectroscopy temperature correction Dielectric frequency response Frequency measurement moisture Power transformers power factor insulation Temperature measurement power transformer DFR FDS Dielectric measurements temperature dependence interference
Content Type	Text
Resource Type	Article

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