Direct observation of time-dependent space charge profiles in XLPE cable under high electric fields

Hozumi, Naohiro; Suzuki, Hiroshi; Okamoto, Tatsuki; Watanabe, Kazuo; Watanabe, Akiyoshi

doi:10.1109/94.368656

Cited by 158 publications

(97 citation statements)

References 12 publications

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“…It is generally concluded that such space charge may result from electrons (and holes) injection from the electrodes and electric field assisted ionization of the impurities in the material or from an inhomogeneous polarization [4][5][6][7][8][9][10]. With the success of space charge measurement on the film samples, attempts had also been made to apply the same techniques (mostly the PEA) in extruded polymer insulated power cables to study the space charge behaviour in cable geometry [11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Influence of thermal treatment and residues on space charge accumulation in XLPE for DC power cable application

Chen

Dissado

et al. 2007

IEEE Trans. Dielect. Electr. Insul.

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This is the unspecified version of the paper.This version of the publication may differ from the final published version. Permanent repository link ABSTRACTEffects of cross-linking by-products (residues) of polyethylene on space charge accumulation and decay are investigated in the paper using the pulsed electro-acoustic technique. Space charge profiles have shown a great variation both in the charge initiation over the voltage ramping up process and later on long term stressing and decay (volts off) among the samples subjected to different conditioning, which results in diverse residues content (fresh, 0.5% residue and thoroughly degassed). The results show that by-products of cross-linking or the residual impurities play a key role in the space charge accumulation in cross-linked polyethylene. On the removal of impurities by degassing, small homocharge was built up in the vicinity of the electrode. It is concluded that space charge accumulation is governed by the charge injection through dielectric/electrode interface when sample is thoroughly degassed.

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Section: Introductionmentioning

confidence: 99%

Influence of thermal treatment and residues on space charge accumulation in XLPE for DC power cable application

Chen

Dissado

et al. 2007

IEEE Trans. Dielect. Electr. Insul.

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“…In [1] it is suggested that the field-dependence of the injection current exhibits hysteresis, whereas in [6] a fluctuation in the injection current produces a packet superimposed upon a SCLC-type homocharge distribution. In contrast [4] relies on acetophenone-assisted field-induced ionization of impurities to generate the packet as an ionization front.…”

Section: Packet Generationmentioning

confidence: 99%

“…The physical nature of charge packets and their effect (if any) upon the insulation material are vexed questions that have not been resolved since their identification [1]. So far there has been only a few papers [2,3] reporting a systematic investigation of the phenomena, hence although a number of models [1,[4][5][6] have been advanced to describe their formation and transit of the insulation, none have received complete acceptance.…”

Section: Introductionmentioning

confidence: 99%

“…So far there has been only a few papers [2,3] reporting a systematic investigation of the phenomena, hence although a number of models [1,[4][5][6] have been advanced to describe their formation and transit of the insulation, none have received complete acceptance. Previous work with XLPE cable peelings [2] has shown that a minimum local field, in this case at the anode, was required for the generation of a charge packet.…”

Section: Introductionmentioning

confidence: 99%

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Temperature dependence of charge packet velocity in XLPE cable peelings

Dissado

Zadeh

Fothergill

et al. 2007

2007 Annual Report - Conference on Electrical Insulation and Dielectric Phenomena

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Abstract-The generation and transit of charge packets in 150m thick peelings from the insulation of Medium Voltage Cables manufactured using the same XLPE batch have been investigated at a number of different temperatures. Charge packet motion was investigated in peelings taken from cables that have been electro-thermally stressed at T= 90C for 5000 hours with a Laplacian field E  20kV/mm at the location of the samples. It was found that charge packets were generated by an applied field of 120kV/mm when the internal space charge field reached 140-150kV/mm. Measurements were made in three controlled temperature environments and it was found that the transit time fitted an Arrhenius behaviour with an activation energy of 1.2 eV. This value is similar to estimates made for the deepest traps (>1.1eV) made from the decay of space charge accumulated at lower fields of 46.67kVmm. It is also close to the activation energy for the conductivity (1.25 eV) obtained from the dielectric spectroscopy of unpeeled cable sections at E rms  0.41 V/mm, and 1.15eV from the dielectric spectroscopy of the peelings (E = 40V/mm). It is therefore concluded that the transit of the charge packet is associated with the trap-to-trap transport of charge carriers located in the deepest traps available. The implications of these results for the mechanism of charge packet generation is discussed.

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“…It is already understood that under positive polarity high voltage application, positive space charges penetrate from high voltage (semicon rubber) electrode and propagates towards ground electrode [5]- [14]. The penetration of space charge into the bulk of insulating material will disturb local electric field.…”

Section: Introductionmentioning

confidence: 99%

Long Time Range Breakdown Caused by Penetration of Positive Charges Packet in Low Density Polyethylene Sheets

Mohamed

Akagi²,

Ozaki³

et al. 2013

ijeei

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This paper presents an experimental study on long time range breakdown of Low Density Polyethylene (LDPE) under very high dc applied fields (E mean ) of 2.0 MV/cm or 3.0 MV/cm. Breakdown time lag and space charge distribution are simultaneously measured for a 200-µm-thick LDPE sheet with positive-semicon and negative-evaporated Al electrodes. A voltage is applied to the sheet until the dc breakdown occurs. 20 samples are tested for both the applied voltages. It should be remarked that 50 % survivor probability T 50 , corresponding to time in which breakdown occurs for 10 samples out of 20, is 70 min for 40 kV, whereas it is 90 min for 60 kV. Results of the space charge measurement by pulsed electro acoustic (PEA) method indicates that a large number of positive charges are injected from the semicon-anode and they are accumulated in the bulk of LDPE, so that field distribution in LDPE is strongly distorted. The maximum field strength E max (t) in LDPE after the space charge penetration for 60 kV becomes higher than that for 40 kV. However, the distortion ratio E max (t) / E mean under 40 kV is higher than that under 60 kV. This is because the positive charges packet produced by 40 kV penetrates into deeper area of the bulk as compared with that by 60 kV.

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Direct observation of time-dependent space charge profiles in XLPE cable under high electric fields

Cited by 158 publications

References 12 publications

Influence of thermal treatment and residues on space charge accumulation in XLPE for DC power cable application

Influence of thermal treatment and residues on space charge accumulation in XLPE for DC power cable application

Temperature dependence of charge packet velocity in XLPE cable peelings

Long Time Range Breakdown Caused by Penetration of Positive Charges Packet in Low Density Polyethylene Sheets

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