Proceedings ArticleDOI
Comparison of partial discharge inception voltages for ester and mineral oils under divergent fields
Andrea Cavallini,C. G. Azcarraga +1 more
- pp 1254-1257
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TLDR
In this paper, the PDIV of two commercially available fluids: a natural ester and mineral oil were compared with simple point-to-plane electrodes, independently of the gap length.Abstract:
Ester oils are making their way into the transformer market, but still some doubts exist about their ability to be successful fluids for high and extra-high voltage transformers. In this paper, we compare the PDIV of two commercially available fluids: a natural ester and mineral oil. Two different setups were considered: Point to plane in oil and point to plane on a pressboard sheet immersed in oil. Fluids and pressboard sheets were fully conditioned prior testing. Results suggest that ester oils perform slightly better with simple point-to-plane electrodes, independently of the gap length. When testing oil/plane electrode configurations with pressboard, ester oils perform much better at short gaps. This behavior has been explained considering the hydrophilicity of ester oils, which helps in further drying the pressboard prior testing. Therefore, ester oils could prove superior to mineral oils in suppressing creeping discharges.read more
Citations
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Journal ArticleDOI
A review of critical evaluation of natural ester vis-a-vis mineral oil insulating liquid for use in transformers: Part II
TL;DR: In this article, the authors compared the green insulating liquid with existing mineral oil technology in terms of environmental concern, fire safety, physio-chemical properties, thermal performance, and dielectric performance and concluded that natural esters are acceptable for new transformers and for retro filling existing units.
Journal ArticleDOI
Use of Alternative Fluids in Very High-Power Transformers: Experimental and Numerical Thermal Studies
Ramazan Altay,Agustín Santisteban,Cristian Olmo,Carlos J. Renedo,Alfredo Ortiz Fernández,Felix Ortiz,Fernando Delgado +6 more
TL;DR: According to the comparison developed, ester-based fluids could replace mineral oils in this type of transformers when they are going to work in a range of powers close to the rated one.
Proceedings ArticleDOI
Partial discharge inception voltages of an inhibited mineral oil in quasi-uniform electric fields
Z. Liu,J.S. Park,Qiang Liu +2 more
TL;DR: In this paper, the authors investigated the PD inception voltage (PDIV) of an inhibited mineral oil under divergent and quasi-uniform a.c. electric fields, and the simulated PDIF of the mineral oil was 1426.4 kV/mm.
DissertationDOI
Partial Discharge Phenomena in Converter and Traction Transformers: Identification and Reliability
TL;DR: In this paper, the effects of non-sinusoidal voltages on transformer insulation have been investigated by many researchers, but still now, there are some issues that must be understood.
Proceedings ArticleDOI
Partial discharge inception voltage measurements of ester dielectric fluid for insulation diagnosis
Mahmoud Mohamed,Muhammad Amirul Hafiz Bin Bakharazi,Hiroshi Kitagawa,Satoshi Matsumoto,Masamichi Kato +4 more
TL;DR: In this paper, the authors used the Needle-To-Plane electrodes configuration to get the partial discharge inception voltage (PDIV) and breakdown voltage (BDV) and compared it with mineral oil.
References
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Journal ArticleDOI
Advanced PD inference in on-field measurements. I. Noise rejection
TL;DR: In this article, a fuzzy classifier is used for noise suppression in measurements performed by ultra wide band digitizers, able to record a large quantity of partial discharge (PD) pulse waveforms.
Journal ArticleDOI
Tracking and surface discharge at the oilߝpressboard interface
TL;DR: A different approach to the study of surface tracking reveals a new view of the oil-pressboard interface and suggests a link between the electric double layer and the boundary layer as discussed by the authors.
Journal ArticleDOI
Investigations on streamers phenomena in mineral, synthetic and natural ester oils under lightning impulse voltage
TL;DR: In this article, the initiation threshold voltage of streamers, their pattern and their stopping length (final length) Lf as well as the associated current and electrical charge, in a point plane electrodes arrangement submitted to a standard lightning impulse voltage (1.2/50 μs).
The breakdown voltage of insulation oil under the influences of humidity, acidity, particles and pressure
TL;DR: In this paper, the breakdown voltage of mineral insulation oil was systematically investigated under the influences of moisture, acidity, pressure and particles, and the observed asymptotic behaviour was shown to come to a maximal end value of breakdown voltage at around 150 kV. The standards IEC156/95 (VDE0370/Part5/96 and ASTM D1816) specified the test conditions.