Degradation of polymeric materials exposed to corona discharges

Zhu, Yong; Otsubo, Masahisa; Honda, C.

doi:10.1016/j.polymertesting.2006.01.003

Cited by 47 publications

(26 citation statements)

References 4 publications

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“…The single tradition materials are facing more challenge, especially, they do not always withstand the damaging effects of corona, which can cause ionization and eventual breakdown of an insulation material or system when the voltage stress reaches to a critical level. To improve the insulating lifespan of high-voltage electrical equipment to resist the corona attack, there is strong interest in insulated polymer materials with good thermal stability and excellent corona resistance [22,23]. Due to the development of nano-technology and nano-materials, polymer nanocomposites are put forward as a kind of novel composite materials with improved insulating characteristics [24,25].…”

Section: Introductionmentioning

confidence: 99%

The influence of TiO2 nanoparticle incorporation on surface potential decay of corona-resistant polyimide nanocomposite films

Zha¹,

George²,

Dang³

et al. 2011

Journal of Electrostatics

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a b s t r a c t PI nanocomposite films containing surface modified nanoparticles by employing silane coupling agent were prepared using in-situ dispersion polymerization process. The surface potential decay measurements on films were investigated over the different negative corona-charged voltages and times in a controlled environment where temperature and relative humidity were kept at 21 C and 45%, respectively. There is a significant change in the surface potential decay characteristics after nano-fillers were introduced into polyimide. The surface potential decay pattern depends also on the amount of nano-fillers. The possible surface potential decay and corona resistance mechanisms responsible for the observed phenomena were discussed.

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Section: Introductionmentioning

confidence: 99%

The influence of TiO2 nanoparticle incorporation on surface potential decay of corona-resistant polyimide nanocomposite films

Zha¹,

George²,

Dang³

et al. 2011

Journal of Electrostatics

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“…According to the Maxwell-Garnett rule [23,24], 34 and ε 2 =9.0 are the dielectric constants of PI matrix and Al 2 O 3 nanoparticle. η Al2O3 is the function of Al 2 O 3 filler loading.…”

Section: Analysis Of Dielectric Propertiesmentioning

confidence: 99%

“…Corona-resistance property decides the lifetime of insulating dielectric in the application field when corona discharge exists. The failure of polymer dielectric is the fracture and degradation of the polymer chains [34]. Figure 11 shows the corona-resistant lifetime of PI/Al 2 O 3 samples as a function of Al 2 O 3 nanoparticle loading at 25 ℃.…”

Section: Corona-resistant Propertiesmentioning

confidence: 99%

Investigation of temperature effects on voltage endurance for polyimide/Al₂O₃nanodielectrics

Luo

Liu

et al. 2014

IEEE Trans. Dielect. Electr. Insul.

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In order to investigate the effects of inorganic nanofillers on the electrical properties of polyimide (PI), PI/Al 2 O 3 nanocomposites films were prepared via the in-situ polymerization. The hybrids films were characterized by scanning electron microscope (SEM) and Fourier transform infrared spectroscopy (FTIR). The dielectric behaviors of pure PI and PI/Al 2 O 3 samples were studied as a function of the measured frequencies and temperatures. Meanwhile, the breakdown strength of pure PI and PI/Al 2 O 3 samples measured at 25 and 230 ℃ was analyzed. The corona-resistant lifetime of samples under bipolar continuous square impulse voltage (BCSIV) was performed. With the wt% content of Al 2 O 3 nanoparticles increasing, the real (ε') and imaginary (ε") of relative permittivity present an increasing tendency, while electrical breakdown strength declines obviously. The Al 2 O 3 nanofillers improved the corona-resistant property of PI and the corona-resistant lifetime of PI/Al 2 O 3 sample with 25 wt% (weight percent) of nano-Al 2 O 3 particles is over 23 times longer than that of the pure PI film. Besides, the temperature is an important factor which would significantly influence the electrical properties of pure PI and PI/Al 2 O 3 samples. The elevated temperature would reduce the breakdown voltage and corona-resistant property.

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“…However discharge gas characteristics may also have an impact on discharge intensity and in turn on erosion behavior. In most of the previous work [11][12][13][14], there is almost no elucidation for the correlation between the environmental stresses and surface discharge intensity as well as surface erosion. The effect of the stressing factors on discharge intensity and discharge gaseous byproducts is expected to play an important role in material erosion [15].…”

Section: Introductionmentioning

confidence: 99%

Factors of influence on surface erosion of epoxy resin exposed to electrical discharges

Refaey¹,

Kindersberger²

2014

IEEE Trans. Dielect. Electr. Insul.

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This paper investigates the influence of electrical as well as environmental stresses on surface erosion of polymeric materials used in high voltage insulation. The analyzed electrical stresses are applied voltage magnitude and frequency; whereas the environmental stresses of concern are temperature and humidity of air above sample surface. Suitable electrode arrangement is chosen in order to produce measurable erosion and guarantee the control of the analyzed stressing factors. Discharge intensity is defined by two parameters; total discharge energy and cumulative charge; whereas surface erosion severity is characterized by three quantities; surface eroded area, eroded volume and maximum erosion depth. Surface characteristics are obtained by a laser profilometer. From the obtained results a dependence of erosion severity on these stressing factors can be proven. A strong correlation between discharge intensity and material surface erosion is concluded.

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Degradation of polymeric materials exposed to corona discharges

Cited by 47 publications

References 4 publications

The influence of TiO2 nanoparticle incorporation on surface potential decay of corona-resistant polyimide nanocomposite films

The influence of TiO2 nanoparticle incorporation on surface potential decay of corona-resistant polyimide nanocomposite films

Investigation of temperature effects on voltage endurance for polyimide/Al₂O₃nanodielectrics

Factors of influence on surface erosion of epoxy resin exposed to electrical discharges

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Degradation of polymeric materials exposed to corona discharges

Cited by 47 publications

References 4 publications

The influence of TiO2 nanoparticle incorporation on surface potential decay of corona-resistant polyimide nanocomposite films

The influence of TiO2 nanoparticle incorporation on surface potential decay of corona-resistant polyimide nanocomposite films

Investigation of temperature effects on voltage endurance for polyimide/Al2O3nanodielectrics

Factors of influence on surface erosion of epoxy resin exposed to electrical discharges

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Investigation of temperature effects on voltage endurance for polyimide/Al₂O₃nanodielectrics