Observation of charge behavior in multiply low-density polyethylene

Liu, Ying; Takada, Tatsuo; Miyata, Hiroyuki; Niwa, Toshimitsu

doi:10.1063/1.354667

Cited by 60 publications

(14 citation statements)

References 5 publications

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“…On (x, y) and the retardation Os (x, y ) caused by the deposited surface charge distribution a(x, y) due to the Pockels effect, that is O(x, y) = en (x, y) + Os (x, y) (27) The natural retardation distribution On (x, y ) also is determined exper imentally from the image data measured before surface charge deposi tion (0. (x, y) = 0), and subtracted from the total retardation O(x, y) to yield Os (x, y), which is linearly related with the deposited surface charge distribution a ( x, y) by the Pockels effect.…”

Section: [!Li(!!; V)]mentioning

confidence: 99%

Acoustic and optical methods for measuring electric charge distributions in dielectrics

Takada¹

1999

IEEE Trans. Dielect. Electr. Insul.

197

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Much progress had been made during the last two decades in acoustic and optical methods for measuring charge distributions in dielectrics. A review on this topic is given, which mainly covers the past research activities associated with that at our laboratory. For acoustic methods, we will discuss and compare the pulsed electroacoustic (PEA) and pressure wave propagation (pwP) methods and present some of the results that enabled us to gain physical insights into the charge dynamics within solid plate samples and coaxial cables. For optical methods, we will discuss the Pockels effect technique that is used for the dynamic measurement of surface charge distributions, and the Kerr effect technique that is developed for measuring electric field distributions within liquid dielectrics. 1 INTRODUCTION T HE Poynting vector represents a flow of electric power equivalent to EXH [W 1m2], where E [V 1m] represents electric field inten sity and H [Aim] the magnetic field intensity. To facilitate the transmission of large amounts of electric energy, which has its equivalent in a large Poynting vector, researchers must strive to increase either the magnetic field jj or the electric field E. An increase of H can be ac complished by using superconducting transmission lines, while that of if can be achieved by increasing the transmission voltage. However, at present, the development of a practical, usable superconducting trans mission system has not been fully realized. Therefore, we have to con tinue our efforts in obtaining high E through a HV transmission system.. To this end, much research on the properties of dielectric and insulating materials will have to be conducted. This is one of the goals of the present workThe advancement of excellent electric insulating materials, in which electric power flows in the form of a Poynting vector, has made a sig nificant contribution to the development of electric power engineer ing, electronics engineering and electronic communication systems in present everyday life, Many researches have been conducted on de voltage-current characteristics by electric conductivity (r; [S/m]) mea surement, and on ac voltage�current characteristics by permittivity (c [F/m]) measurement in the past years. However, that research con sidered only the case where the current flowing through the materials had reached the steady state and the electric field across thematerial was uniform and independent of time.During the last 20 years, because electric power apparatus has be· come more compact, and electronic devices have become much smaller, the insulating materials used are highly stressed to > 1 MV I cm, which is near the breakdown strength of the insulating materials. Under such high electric field application, electric charges may be injected fromelec trodes or be dissociated from impurities that occur in the material. These electric charges accumulated in the insulating material distort the orig· inal internal electric field distribution. The process may cause the insu lating material to degrade and som...

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Section: [!Li(!!; V)]mentioning

confidence: 99%

Acoustic and optical methods for measuring electric charge distributions in dielectrics

Takada¹

1999

IEEE Trans. Dielect. Electr. Insul.

197

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“…It has been proposed that the accumulated space charge at the interface is a more significant factor with regards to electric field enhancement than in the bulk [3]. Despite of increasing interests in the interfaces, the underlying mechanisms related to charge formation and electrical ageing are not well understood and research into the best interfacial materials and its binding structure is becoming increasingly important.…”

Section: Introductionmentioning

confidence: 99%

Interfacial characteristics of space charge in multi-layer LDPE

Chen

2008

2008 International Conference on Condition Monitoring and Diagnosis

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Abstract--This paper reports on the investigation into space charge characteristics at interfaces of multi-layer polymeric materials. Planar low density polyethylene (LDPE) samples were used in this study. DC voltage up-to 10 kV was applied to the sample and space charge measurements were taken using the pulsed electro-acoustic (PEA) technique. Experimental results indicated that the electrode interface plays an important role in determining the bulk charge formation and polymer layer interface has different effects on electrons and holes trapping.

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“…Nowadays, there is a growing interest in understanding space charge phenomena in insulating materials, not only in the bulk of a dielectric, but also at the interface between two different media. [1][2][3][4][5][6][7][8][9] However, with pulsed electro-acoustic (PEA) techniques, most of this research work was conducted at room temperature, while space charge dynamics in insulation under DC electric stress and at different temperatures have only received limited attention. [10][11][12][13][14][15][16][17][18][19][20] The general objective of the present study is to obtain a better understanding of the major factors that control the space charge process and its decay at the dielectric interface.…”

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confidence: 99%

“…For this reason, we take the time t 2 as the first value where the charges remain constant, and we calculate the trap depthD max used in the formula (5).…”

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confidence: 99%