Space charge characteristics in cross-linking polyethylene under electrical stress from dc to power frequency

Wang, X; Yoshimura, N.; Tanaka, Yasuhiro; Murata, Koichi; Takada, Tatsuo

doi:10.1088/0022-3727/31/16/016

Cited by 37 publications

(18 citation statements)

References 20 publications

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“…Figure 7 shows the trap level distribution in LDPE and the nanocomposites. The trap levels for both LDPE and the nanocomposites are in the range 0.80-1.05 eV with a density peak around 0.94 eV, which can be regarded as deep trap levels in LDPE [44]. This is consistent very well with the results obtained by M. Ieda et al, who assigned the deep trap level in LDPE to be 0.92 eV [45].…”

Section: Stepwise Electric Field Induced Conduction Currentsupporting

confidence: 90%

Stepwise electric field induced charging current and its correlation with space charge formation in LDPE/ZnO nanocomposite

Tian

Yao

et al. 2015

IEEE Trans. Dielect. Electr. Insul.

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This study intends to establish the correlation between charging current under stepwise increased electric field and space charge formation in low density polyethylene (LDPE) and LDPE/ZnO nanocomposites. By applying stepwise increased electric field, the charging current and space charge distribution were measured as a function of time under 10, 30 and 50 kV/mm, respectively. The results show that homopolar space charge formation induces increasing charging current with time, while heteropolar space charge formation induces decaying charging current and excellent space charge suppression is accompanied by constant charging current with time. The abundant deep trapping states introduced by nanofillers dominate both the lower steady charging current and space charge suppression in the nanocomposite. The results indicate that charging current behavior induced by stepwise increased electric field is extremely informative and is feasible to be a direct method for rough estimation of space charge formation and suppression in polymer dielectrics. Addition of ZnO nanofillers suppresses space charge accumulation in LDPE, indicating LDPE/ZnO nanocomposite is a potential insulation material for high voltage direction current cables.Index Termsstepwise increased electric field, charging current, space charge, nanodielectrics, LDPE/ZnO.

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Section: Stepwise Electric Field Induced Conduction Currentsupporting

confidence: 90%

Stepwise electric field induced charging current and its correlation with space charge formation in LDPE/ZnO nanocomposite

Tian

Yao

et al. 2015

IEEE Trans. Dielect. Electr. Insul.

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“…The maximum stressing time in our experiments is 2 h and bulk space charge accumulation is clearly shown at a frequency of 10 Hz and a temperature of 50°C. Wang et al [18] reported a upper limit frequency of 20mHz for space charge accumulation in polyethylene. The present results are in some respect in accordance with this statement considering measurements at 25°C.…”

Section: Discussionmentioning

confidence: 99%

Space-charge dynamic in polyethylene: from dc to ac stress

Thomas

Teyssèdre

Laurent

2010

J. Phys. D: Appl. Phys.

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Abstract. Time-resolved space charge profiles obtained in low density polyethylene under sinusoidal or square AC stress for frequencies going from DC to 10 Hz, temperature from 25 to 50°C and fields of 30 or 40 kV/mm are presented. It is shown that most of the features observed under DC stress (generation of carriers of the two polarities with non-symmetrical amount and velocity) are still active under AC stress. As a matter of fact, it is shown that a negative space charge builds up at 50°C within the whole insulation bulk even with relatively high stress frequency and for short stressing time (2 h). These results clearly show that space charge has to be considered under AC condition.Confidential: not for distribution.

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“…Typical results ob tained shown in Table 2 are as follows. Space charge formation caused by crosslinking agent residues [181 or additives [19], space charge accu mulation at the interface of two-layer materials [29,30,321, charge be havior near the field of electric breakdown [33][34][35], charge behavior in the material after electron-beam [36] and 'I-beam irradiation [37], space· charges in organic photoconductive materials used in electronic photo copy machines [38][39][40][41], also in print circuits [42] [47,48] are also reported. Furthermore, when the simultaneous measurement of thermally stimulated current (rse) and space charge distribution was developed, the displacement current due to the charge movement and the conductivity current were separated [51,52].…”

Section: Acous Tic Methodsmentioning

confidence: 99%

Acoustic and optical methods for measuring electric charge distributions in dielectrics

Takada¹

1999

IEEE Trans. Dielect. Electr. Insul.

200

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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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Space charge characteristics in cross-linking polyethylene under electrical stress from dc to power frequency

Cited by 37 publications

References 20 publications

Stepwise electric field induced charging current and its correlation with space charge formation in LDPE/ZnO nanocomposite

Stepwise electric field induced charging current and its correlation with space charge formation in LDPE/ZnO nanocomposite

Space-charge dynamic in polyethylene: from dc to ac stress

Acoustic and optical methods for measuring electric charge distributions in dielectrics

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