Moisture and space charge in oil-impregnated pressboard under HVDC

Liu, R.; Jaksts, A.; Törnkvist, C.; Bergkvist, Magnus

doi:10.1109/icsd.1998.709217

Cited by 19 publications

(11 citation statements)

References 11 publications

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“…(21)(22)(23)(24) We measured, for the first time, the distribution of space charge inside the pressboard as well as at the interface between a plain oil gap and a pressboard (Fig. 4).…”

Section: Applications To Power Transformersmentioning

confidence: 99%

“…The pressure pulse techniques have also been used for the measurement of space charge in composite oil/cellulose insulating systems. (21)(22)(23)(24)(25) For the measurement of electric fields and space charge in liquid dielectrics and surface charge on solids in air, the electrooptic Kerr effect technique (26)(27)(28)(29)(30) and Pockels effect technique (31)(32)(33) have been developed. In comparison with the earliest slice method, (34) these latest techniques can be used to measure quantitatively the distribution of space charge in an insulating material nondestructively, and thus are valuable tools in helping to understand the electrical behaviors of an insulation system in the development of power equipment, such as high-voltage direct-current (HVDC) cables ( Fig.…”

Section: Introductionmentioning

confidence: 99%

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Space Charge Measurement Technologies and Their Potential Applications

2017

Sensors and Materials

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The development history of major space-charge measurement technologies is reviewed. Advantages and disadvantages are analyzed regarding the electron beam, thermal pulse, pressure wave, pulsed electroacoustic wave, electrooptic Kerr effect, and Pockels effect methods. Measurement technologies are discussed further with regard to principles, knowhow, and milestones of development. With the pulsed electroacoustic method as an example, a deconvolution technique is introduced, as it is needed to quantify the density of space charge in a material. Potential applications of these technologies to measure the distribution of space charge in dielectrics and electrical insulation materials and systems are addressed. By the electrooptic Pockels effect method, two-dimensional discharge patterns on the surfaces of cellulose Kraft paper and Nomex T410 paper were measured and reported for the first time. With the progress of the technologies, it appears that today, sensors can be made to measure quantitatively the distribution of space charge in dielectrics and electrical insulation systems.

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“…(21)(22)(23)(24) We measured, for the first time, the distribution of space charge inside the pressboard as well as at the interface between a plain oil gap and a pressboard (Fig. 4).…”

Section: Applications To Power Transformersmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Space Charge Measurement Technologies and Their Potential Applications

2017

Sensors and Materials

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“…Partial discharge or breakdown may occur in those places where the electrical field strength is strengthened; this can lead to premature failure of the insulation material (Zhang et al 1996;Liu et al 1989). To date, research has focused on the space charge dynamics of oil-impregnated insulation paper affected by voltage level, temperature, and moisture (Morshuis and Jeroense 1997;Ciobanu et al 2002;Tang et al 2010;Zhou et al 2009;Liu et al 1998). Although studies have found that many nanoparticles improve the space charge distribution in insulation materials such as polyethylene and polyimide, there are no reports on how to improve the space charge distribution in oil-impregnated insulation paper (Fleming et al 2005;Huang et al 2009;Wang et al 2009;Zha et al 2010;Thelakkadan et al 2011;Abd El-kader et al 2009;Ahmad et al 1992).…”

Section: Introductionmentioning

confidence: 99%

Space Charge Behavior in Oil-Impregnated Insulation Paper Reinforced with Nano-TiO2

Liao¹,

Lv²,

Yang³

et al. 2013

BioResources

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a Oil-impregnated insulation paper is widely used in power transformers, and the insulation properties of oil-impregnated insulation paper play an important role in the reliability of power equipment. The formation and dynamics of space charge can affect the performance of insulation material. However, methods to improve the space charge distribution in oil-impregnated insulation paper are rarely reported. In this paper, space charge behavior in oil-impregnated insulation paper has been investigated using the pulsed electro-acoustic (PEA) technique. A series of measurements was applied when the oil-impregnated insulation paper reinforced with different nano-TiO 2 contents was subjected to various electric field strengths. The accumulation and decay of space charge are discussed, and the internal electric field strength distribution of oilimpregnated insulation paper is analyzed. The test results show that the space charge distribution is improved and the distortion rate of the internal electric field strength is reduced by adding nano-TiO 2 to the oilimpregnated insulation paper. The results show that the proposed method offers a new way to improve the properties of oil-impregnated insulation paper.

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“…R. S. Liu finds that a higher moisture concentration causes a faster formation and deeper penetration of space charge inner oilpaper insulation [7]. R. Ciobanu et al has investigated the influence of gamma radiation ageing on space charge behaviors [8].…”

Section: Introductionmentioning

confidence: 99%

Space Charge Behavior of Oil-paper Insulation Thermally Aged under Different Temperatures and Moistures

Zhou¹,

Huang²,

Chen³

et al. 2015

Journal of Electrical Engineering and Technology

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-Moisture and high temperature are the most important factors that lead to the ageing of oil-paper insulation, but the research about space charge characteristics of oil-paper insulation does not take the combined effect of ambient temperature, moisture and thermal ageing into account. The pulsed electroacoustic (PEA) method was used to investigate the influence of moisture and temperature on space charge characteristics of oil paper at different ageing stages. The results showed that moisture could speed up formation of space charge in oil paper when water concentration was low, but the formation was restrained if the water concentration was high. At the beginning of thermal ageing, heterogeneous charge accumulation had predominance, but it gradually changed to homogeneous charge injection with ageing. It was believed that moisture concentration could speed up ageing and enhance charge accumulation on one hand, and accelerate or slow down the establishment speed of space charge on the other hand, therefore, charge accumulation type changed with ageing. The more seriously the oil-paper insulation was thermally aged, the deeper the trap energy level was, hence more space charge was trapped, which could be speeded up by increasing the ageing temperature, but the effect of ambient temperature did not fit the Arrhenius law.

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Moisture and space charge in oil-impregnated pressboard under HVDC

Cited by 19 publications

References 11 publications

Space Charge Measurement Technologies and Their Potential Applications

Space Charge Measurement Technologies and Their Potential Applications

Space Charge Behavior in Oil-Impregnated Insulation Paper Reinforced with Nano-TiO2

Space Charge Behavior of Oil-paper Insulation Thermally Aged under Different Temperatures and Moistures

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