A Moisture-in-Oil Model for Power Transformer Monitoring—Part II: Experimental Verification

García, Belén; Burgos, Juan Carlos; Alonso, A.M.; Sanz, J.

doi:10.1109/tpwrd.2004.832361

Cited by 30 publications

(20 citation statements)

References 2 publications

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“…Diagnostic devices and techniques based on live measurements of moisture content [7,8], temperature [9,10], partial discharges [11][12][13] and spectral responses [14] have been developed to activate alarm when threshold values are reached either in oil or in paper.…”

Section: Introductionmentioning

confidence: 99%

Moisture and electrical discharges effect on naphthenic mineral oil properties

Toudja

Moulai

Nacer

et al. 2014

IET Science, Measurement & Technology

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The physicochemical properties of three transformer mineral oils of different levels of degradation, resulting from exposure to moisture and electrical discharges, are investigated. The first oil is new and untreated whereas the second is taken from a transformer after one year of normal operation; and the third oil is extracted from a 15-year-old operating transformer. The considered parameters are breakdown voltage, dielectric constant ε r , dissipation factor (tan δ) and resistivity. Isothermal charging currents have also been measured under dc for long application times. It is shown that the physicochemical characteristics present major differences depending on the considered oil sample. An easy method enabling to determine the water solubility in oil is proposed; this method is based on the measurement of oil resistivity. To validate a part of the results obtained in laboratory, measurements on an on-load operating transformer have also been achieved. These show that the properties of oils with dissolved water in laboratory are similar to those of oils with really dissolved water inside operating transformers.

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Section: Introductionmentioning

confidence: 99%

Moisture and electrical discharges effect on naphthenic mineral oil properties

Toudja

Moulai

Nacer

et al. 2014

IET Science, Measurement & Technology

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“…Also, the existence of a significant amount of the second harmonic in some winding faults is reported in Zaman and Harman (1998). In Garcia et al (2005a), the moisture in oil model is well modelled and (Garcia et al, 2005b) monitoring of moisture in oil for power transformer was experimentally verified. A real-time testing of WPT-based protection algorithm has been presented in Saleh and Rahman (2005) for three phase transformers.…”

Section: Introductionmentioning

confidence: 92%

Low cost digital measurement system for determination of temperature rise in dry type transformer

Murugesan¹,

Paramasivam²,

Krishnan³

2011

IJIT

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This paper describes a fully automated method of measuring the cold and hot resistance of a transformer. The measuring scheme was developed by using a code composer studio (CCS) environment, TMS320F2812 digital signal processor and external interface hardware. The CCS allows a high degree of software modularity and provides the features that are required for sensor zero adjustment, data acquisition through ADC and analysis, and automated presentation of results. Furthermore, the experimental setup described in this paper could be used to obtain the cold and hot resistance of other electromechanical devices. The real-time implementation of cold and hot resistance measured setup and the results from a test on transformer are presented in the paper.

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“…Time-dependent dielectric response When a dielectric material is subjected to an electrical stress, the vectors called dielectric displacement D, which gives total charge density induced at the electrodes, and applied electric field E can be interrelated [10][11][12][13],…”

Section: Dielectric Response Of Insulationmentioning

confidence: 99%

The assessment of oil-paper insulation condition based on frequency response method

et al. 2010

2010 Annual Report Conference on Electrical Insulation and Dielectic Phenomena

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For analysis of the status of oil-paper insulation, the dielectric response method was used to model oil-paper insulation system. Then the dielectric spectroscopy of oil-paper insulation system was tested. And the influence of oil gap on the test results of oil-paper insulation response was discussed. The results showed that the dielectric response method can effectively assess the status of oil-paper insulation, and the influence of oil gap on the test results is less than 10%.

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A Moisture-in-Oil Model for Power Transformer Monitoring—Part II: Experimental Verification

Cited by 30 publications

References 2 publications

Moisture and electrical discharges effect on naphthenic mineral oil properties

Moisture and electrical discharges effect on naphthenic mineral oil properties

Low cost digital measurement system for determination of temperature rise in dry type transformer

The assessment of oil-paper insulation condition based on frequency response method

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