Field distortion by a single cavity in HVDC XLPE cable under steady state

He, Min; Lewin, P.L.

doi:10.1049/hve.2016.0013

Cited by 19 publications

(18 citation statements)

References 21 publications

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“…It is stated in Huang et al (2015) that the field in the middle of HVDC cable is nearly independent to the temperature distribution and, therefore, current through the conductor. Besides, it is given in He et al (2016) that field reversal, where field in the region closer to the conductor tends to be weaker than that further from the conductor. The equation calculating the critical temperature difference value across the conductor and the sheath is given in He et al (2016) as well, and the level for the parameter of good material used in this paper is 5.77K.…”

Section: Resultsmentioning

confidence: 99%

“…Besides, it is given in He et al (2016) that field reversal, where field in the region closer to the conductor tends to be weaker than that further from the conductor. The equation calculating the critical temperature difference value across the conductor and the sheath is given in He et al (2016) as well, and the level for the parameter of good material used in this paper is 5.77K. Temperature difference for the I = 1kA, I = 3kA and I = 4kA is 3.52K, 34.6K and 56.4K.…”

Section: Resultsmentioning

confidence: 99%

“…A fieldand temperature-dependant electrical conductivity is applied to determine the electric field distribution with the cable insulation at the steady state under DC voltage (He et al, 2016), which is expressed as (Boggs et al, 2001):…”

Section: External Factor Effect On Electrical Conductivitymentioning

confidence: 99%

“…These parameters are generally acquired from experimental works (Boggs et al, 2001). Temperature distribution and electric field distribution across the insulation at DC steady state are discussed in He et al (2016). If the insulation layer is closer to the conductor, it is with higher temperature.…”

Section: External Factor Effect On Electrical Conductivitymentioning

confidence: 99%

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Numerical study of influential factors on partial discharges in HVDC XLPE cables

Hao

George

et al. 2018

COMPEL

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Purpose For the dramatically developed high voltage direct current (HVDC) power transmission, HVDC cables play a vital role in the power transmission across seas and connections with renewable power sources. However, the condition monitoring of HVDC cables is still a challenging research topic. This paper aims to understand the influence of external factors, namely, current, cavity location and material properties, on partial discharge (PD) characteristics in HVDC cable in a numerical way referring to the refined Niemeyer’s model. Design/methodology/approach The influences of the three external factors are studied by a proposed numerical model for DC PDs based on the modification of a conventional PD model for AC voltage via a finite element analysis method. Findings The external factors can influence the discharge magnitude and discharge repetition rate via affecting the electrical conductivity of the material: DC PD is more frequent and with higher discharge magnitude when the cavity is closer to the conductor or the current through the conductor is higher. Both DC PD repetition rate and average discharge magnitude in long-term aged material are lower than virgin material. The effect of discharge on insulation degradation becomes decreasingly significant. Research limitations/implications The current work is based on the numerical modelling of DC PDs. Further experimental validations and comparisons are essential for improving the model. Practical implications The studies of the influence factors for PDs under HVDC voltage can benefit the research and practical power transmission on DC PDs, contributing the design and test of DC PDs in HVDC cables, exploring the understandings of the DC PDs’ mechanism. Originality/value This paper, to the best of author’s knowledge, first studies the influence factors on DC PDs based on the numerical modelling work.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: External Factor Effect On Electrical Conductivitymentioning

confidence: 99%

Section: External Factor Effect On Electrical Conductivitymentioning

confidence: 99%

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Numerical study of influential factors on partial discharges in HVDC XLPE cables

Hao

George

et al. 2018

COMPEL

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“…The transmission of HVDC cable through its narrow corridors, large transmission capacity, low line loss and high efficiency develops rapidly, and plays an important role in the integration of renewable energy generation, offshore platforms and island power transmission [1], [2]. At present, the most commonly used HVDC cable insulation material is cross-linked polyethylene (XLPE) [3]. However, there are still some disadvantages that cannot be avoided although its insulation level has reached 500 kV [4], [5].…”

Section: Introductionmentioning

confidence: 99%

Polycyclic Compounds Affecting Electrical Tree Growth in Polypropylene Under Ambient Temperature

Zhu

Hou

2020

IEEE Access

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Polypropylene (PP) has great potential to be used as recyclable high-voltage direct current (HVDC) cable insulation material. Electrical tree is the key factor that leads to cable insulation failure and limits the increase of HVDC transmission voltage level. In this study, three different polycyclic compounds, namely 4,4'-bis(dimethylamino)phenylazo, 2-hydroxy-2-phenylacetophenone and 4-phenylbenzophenone, are added into PP matrix with the addition content of 0.1 wt%. The electrical treeing experiments are conducted under impulse superimposed DC voltage at 30, 70 and 90 • C. Then the polycyclic compound with the best effect on inhibiting electrical tree is selected, and its filling ratio is further changed from 0.1 wt% to 0.3 wt% to get the optimal inhibition effect. It is found that the addition of 2-hydroxy-2-phenylacetophenone can inhibit the electrical tree degradation. However, the addition of 4-phenylbenzophenone and 4,4'-bis(dimethylamino)benzene will increase the electrical tree length and accumulated damage. As the content of 2-hydroxy-2-phenylacetophenone increases, the electrical tree length and accumulated damage decrease firstly, and then increase. The effect of polycyclic compounds on the electrical tree degradation is affected by the relative polarity of impulse superimposed DC voltage and temperature. The experimental results reveal that adding 0.1 wt% 2-hydroxy-2-phenylacetophenone polycyclic compound to PP can effectively inhibit the electrical tree degradation, which has great potential for application in recycle HVDC cables.

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Analytic calculation of partial discharge threshold in a gaseous cavity within high voltage cable insulation

et al. 2021

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Field distortion by a single cavity in HVDC XLPE cable under steady state

Cited by 19 publications

References 21 publications

Numerical study of influential factors on partial discharges in HVDC XLPE cables

Numerical study of influential factors on partial discharges in HVDC XLPE cables

Polycyclic Compounds Affecting Electrical Tree Growth in Polypropylene Under Ambient Temperature

Analytic calculation of partial discharge threshold in a gaseous cavity within high voltage cable insulation

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