2007
DOI: 10.1002/etep.172
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Improved analytical expressions for the reduction factor of feeding lines consisting of three single‐core cables

Abstract: SUMMARYThe paper presents an original analytical procedure giving analytical expressions for the determination of ground fault current distribution for a fault located anywhere along a feeding line consisting of three single-core cables. The derived analytical expressions are mathematically rigorous and take into account all the relevant factors without introducing some larger approximations or idealizations of the real electrical circuit. Correct estimation of ground fault current distribution is necessary in… Show more

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Cited by 23 publications
(5 citation statements)
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“…In this section a comparison between MCA and k-factor approaches found in technical literature [8][9][10][11][12][13][14][15][16][17][18][19] and international standards [20,21] is presented. Figure 13 shows a single-circuit solid-bonded UGC during a phase 1-to-screen 4 short circuit: it occurs at receiving-end.…”
Section: Comparison With K-factorsmentioning
confidence: 99%
See 1 more Smart Citation
“…In this section a comparison between MCA and k-factor approaches found in technical literature [8][9][10][11][12][13][14][15][16][17][18][19] and international standards [20,21] is presented. Figure 13 shows a single-circuit solid-bonded UGC during a phase 1-to-screen 4 short circuit: it occurs at receiving-end.…”
Section: Comparison With K-factorsmentioning
confidence: 99%
“…When the aim is the computation of the rise of earth potential (ROEP) at substation sites there are several contributions in the literatures involving the k-factors [8][9][10][11][12][13][14][15][16][17][18][19][20][21]. These contributions are generally based on solidly-bonded (SB) cables and are not applicable to cross-bonded cables.…”
Section: Introductionmentioning
confidence: 99%
“…phase conductors, sheaths, armourings, additional conductors). In practice, we have that the fraction of fault current, returning to the feeding substation(s), through the earth I e (defined as “earth current”) is given by: Ie=i=1NIi=rIfIn a very first approximation, r can be considered as a constant quantity depending only on the cable characteristics [2, 7, 8]; more refined approaches take into account, with much more precision, of the cable characteristics and, above all, of the position of the fault point along the power cable route [9, 10]. Nevertheless, these simplified approaches do not consider the earth over‐potential produced by the current injection into soil by the earthing electrodes present along the power cable and by the feeding station(s) earthing grids which is responsible of the conductive coupling with nearby metallic structures.…”
Section: Introductionmentioning
confidence: 99%
“…Sheath losses due to different situations such as cables arrangements, and different conductor and sheath resistances are computed in 1 study by standard formulas. An analytical procedure is proposed in 1 study to determine the reduction factor for sheathed single‐core 3‐phase cables. The paper is based on fault current calculation in anywhere of power cable line and determination of metallic sheath cross section that could be durable in fault thermal condition.…”
Section: Introductionmentioning
confidence: 99%