Study on the dielectric characteristics of DC XLPE cables

Ogata, Sumitoshi; Maekawa, Yuichi; Terashima, Kazuki; Okiai, R.; Yoshida, Shigeo; Yamanouchi, Hiroshi; Yokoyama, S.

doi:10.1109/61.57962

Cited by 11 publications

(5 citation statements)

References 2 publications

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“…Under dc conditions, the dielectric losses are without the dipole losses and only include those due to the leakage current through the insulation with resistivity (q ins ) taken as 10 15 X-m [22,23]. The rated cable voltage under dc operating condition is considered to be ffiffiffi 2 p V ac;rated , which will be justified in Section 2.3.2.…”

Section: Dielectric Loss Reductionmentioning

confidence: 99%

Grid capacity and efficiency enhancement by operating medium voltage AC cables as DC links with modular multilevel converters

Shekhar

Kontos

Ramírez-Elizondo

et al. 2017

International Journal of Electrical Power & Energy Systems

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a b s t r a c tIt is anticipated that with the thrust towards use of clean energy resources such as electric vehicles, future distribution grids will face a steep increase in power demand, forcing the utility operators to invest in enhancing the power delivering capacity of the grid infrastructure. It is identified that the critical 5-20 km medium voltage (MV) underground ac distribution cable link, responsible for bulk power delivery to the inner urban city substation, can benefit the most with capacity and efficiency enhancement, if the existing infrastructure is reused and operated under dc. Quantification of the same is offered in this paper by incorporating all influencing factors like voltage regulation, dc voltage rating enhancement, capacitive leakage currents, skin and magnetic proximity effect, thermal proximity effect and load power factor. Results are presented for three different ac and dc system topologies for varying cable lengths and conductor cross-sections. The computed system efficiency is enhanced with use of modular multilevel converters that have lower losses due to lower switching frequency. A justified expectation of 50-60% capacity gains is proved along with a generalized insight on its variations that can be extrapolated for different network parameters and configurations. Conditions for achieving payback time of 5 years or lower due to energy savings are identified, while the socio-economic benefits of avoiding digging and installing new cable infrastructure are highlighted. The technical implications of refurbishing cables designed for ac to operate under dc conditions is discussed in terms of imposed electric fields, thermal profile and lifetime. A novel opportunity of temperature dependent dynamic dc voltage rating to achieve additional capacity and efficiency gains is presented.

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Section: Dielectric Loss Reductionmentioning

confidence: 99%

Grid capacity and efficiency enhancement by operating medium voltage AC cables as DC links with modular multilevel converters

Shekhar

Kontos

Ramírez-Elizondo

et al. 2017

International Journal of Electrical Power & Energy Systems

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“…As increasing temperature, K PDC is increased because quantities of space charge formation may be reduced by thermal activated detrapping of electrons. 16,17) From Fig. 4 and Table III, it is considered that nano-sized Al 2 O 3 particles may be act as shallow trap rather than deep trap.…”

Section: Breakdown and Polarity Reversal Breakdownmentioning

confidence: 99%

“…1,2) Recently, nanocomposite material has attracted the attention of many researchers in the field of dielectric and electrical insulation. Cross-linked polyethylene (XLPE) insulating cable, which is currently widely applied to AC power cable, is known to have a number of problems in insulation when used for DC usage, i.e., prominent accumulation of space charge in XLPE insulation material.…”

Section: Introductionmentioning

confidence: 99%

“…Nanocomposites show a series of unique properties, such as electrics, thermals and mechanics, because of nanoparticles with a giant specific surface area, quantum size effect and the special interface between particles and polymer matrix. 1,2) Recently, nanocomposite material has attracted the attention of many researchers in the field of dielectric and electrical insulation. Cross-linked polyethylene (XLPE) insulating cable, which is currently widely applied to AC power cable, is known to have a number of problems in insulation when used for DC usage, i.e., prominent accumulation of space charge in XLPE insulation material.…”

Section: Introductionmentioning

confidence: 99%

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DC conduction and breakdown characteristics of Al₂O₃/cross-linked polyethylene nanocomposites for high voltage direct current transmission cable insulation

Park¹,

Kwon²,

Sim³

et al. 2014

Jpn. J. Appl. Phys.

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We have discussed a cross-linked polyethylene (XLPE) nanocomposite insulating material that is able to DC voltage applications. Nanocomposites, which are composed in polymer matrix mixed with nano-fillers, have received considerable attention because of their potential benefits as dielectrics. The nano-sized alumina oxide (Al 2 O 3 )/XLPE nanocomposite was prepared, and three kinds of test, such as DC breakdown, DC polarity reversal breakdown, and volume resistivity were performed. By the addition of nano-sized Al 2 O 3 filler, both the DC breakdown strength and the volume resistivity of XLPE were increased. A little homogeneous space charge was observed in Al 2 O 3 /XLPE nanocomposite material in the vicinity of electrode through the polarity reversal breakdown test. From these results, it is thought that the addition of Al 2 O 3 nano-filler is effective for the improvement of DC electrical insulating properties of XLPE.

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“…Because of the risk of space charge under DC electric field in unmodified XLPE, the material is seldom used today for DC applications. [1][2][3] In this paper, silane treated nano-sized ZnO by varying the contents and nano particle size of the XLPE specimens were made and describes the findings of a study on eletrical experimental of insulation material. In order to calculate temperature dependence of XLPE nanocomposite sample, DC dielectric breakdown strength was measured.…”

mentioning

confidence: 99%

Electrical insulation evaluation of crosslinked polyethylene nanocomposite blended with ZnO

Kim¹,

Cha²,

Lim³

et al. 2012

2012 IEEE International Conference on Condition Monitoring and Diagnosis

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The development of materials using the concept of composite materials has long been of much interest. Recently, the new field referred to as nano science and technology has emerged, in line with noticeable research advancements that revealed new physical phenomena in the nano-sized ultra micro region, and improved material properties. Cross-linked polyethylene(XLPE) is extensively used for AC high voltage power cable for many years. Because of the risk of space charge under DC electric field in unmodified XLPE, the material is seldom used today for DC applications. [1][2][3] In this paper, silane treated nano-sized ZnO by varying the contents and nano particle size of the XLPE specimens were made and describes the findings of a study on eletrical experimental of insulation material. In order to calculate temperature dependence of XLPE nanocomposite sample, DC dielectric breakdown strength was measured. In addition, experimental data were processed with a weibull probability distribution. In conclusion, changing the content and the particle size of nano-additives for HVDC power cable insulation was applied. In order to apply HVDC power cable insulation, the unipolar DC breakdown strength, and space charge formation under DC polarity reversal breakdown strength were investigated.

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Study on the dielectric characteristics of DC XLPE cables

Cited by 11 publications

References 2 publications

Grid capacity and efficiency enhancement by operating medium voltage AC cables as DC links with modular multilevel converters

Grid capacity and efficiency enhancement by operating medium voltage AC cables as DC links with modular multilevel converters

DC conduction and breakdown characteristics of Al₂O₃/cross-linked polyethylene nanocomposites for high voltage direct current transmission cable insulation

Electrical insulation evaluation of crosslinked polyethylene nanocomposite blended with ZnO

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Study on the dielectric characteristics of DC XLPE cables

Cited by 11 publications

References 2 publications

Grid capacity and efficiency enhancement by operating medium voltage AC cables as DC links with modular multilevel converters

Grid capacity and efficiency enhancement by operating medium voltage AC cables as DC links with modular multilevel converters

DC conduction and breakdown characteristics of Al2O3/cross-linked polyethylene nanocomposites for high voltage direct current transmission cable insulation

Electrical insulation evaluation of crosslinked polyethylene nanocomposite blended with ZnO

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DC conduction and breakdown characteristics of Al₂O₃/cross-linked polyethylene nanocomposites for high voltage direct current transmission cable insulation