Determination of the reduction factor for feeding cable lines consisting of three single-core cables

Popovic, L.M.

doi:10.1109/tpwrd.2003.813814

Cited by 33 publications

(6 citation statements)

References 7 publications

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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%

“…Moreover, it has been verified with MCA that the behaviour of ground return current during phase 1-to-screen 4 short circuit is constant along the line. If the short circuit location is along the line at ℓ distance from sending-end, the paper [8] gives this general formula:…”

Section: Solid-bondingmentioning

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%

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Ground Return Current Behaviour in High Voltage Alternating Current Insulated Cables

et al. 2014

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Abstract:The knowledge of ground return current in fault occurrence plays a key role in the dimensioning of the earthing grid of substations and of cable sealing end compounds, in the computation of rise of earth potential at substation sites and in electromagnetic interference (EMI) on neighbouring parallel metallic conductors (pipes, handrails, etc.). Moreover, the ground return current evaluation is also important in steady-state regime since this stray current can be responsible for EMI and also for alternating current (AC) corrosion. In fault situations and under some assumptions, the ground return current value at a substation site can be computed by means of k-factors. The paper shows that these simplified and approximated approaches have a lot of limitations and only multiconductor analysis can show the ground return current behaviour along the cable (not only the two end values) both in steady-state regime and in short circuit occurrence (e.g., phase-to-ground and phase-to-phase-to-ground). Multiconductor cell analysis (MCA) considers the cable system in its real asymmetry without simplified and approximated hypotheses. The sensitivity of ground return current on circuit parameters (cross-bonding box resistances, substation earthing resistances, soil resistivity) is presented in the paper. OPEN ACCESSEnergies 2014, 7 8117

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Section: Comparison With K-factorsmentioning

confidence: 99%

Section: Solid-bondingmentioning

confidence: 99%

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Ground Return Current Behaviour in High Voltage Alternating Current Insulated Cables

et al. 2014

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“…The main point of interest of Table III, however, is the comparison of ground potential rise values (U G in the Table) in the faulted substations, for the all-OHL and all-UGC systems. Reported values show that, an increasing undergrounding degree implies a significant reduction of ground voltage despite the augmented fault currents, due to the fault current-draining effect of crossbonded cable sheaths [5] [6]. For the considered cases, the share of zero-sequence fault current actually flowing in the grounding system of faulted substations is about 18% at terminal stations, and below 4% at PSs.…”

Section: The Atp-emtp Analysismentioning

confidence: 94%

“…Moreover, higher fault currents, for both three-phase (3L) and 1-phase-to-ground (1LG) faults, will occur. Issues related to the calculation of ground fault currents in EHV/HV substations and along HV lines have been discussed in [3] and [4], while a specific approach to HV networks including cable lines is examined in [5] and [6].…”

Section: Introductionmentioning

confidence: 99%

Fault current increase due to the progressive undergrounding of a HV subtransmission network

Schembari

Codino

Catapano

et al. 2015

2015 IEEE 15th International Conference on Environment and Electrical Engineering (EEEIC)

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The undergrounding of HV subtransmission networks in urban/suburban areas is bound to increase fault currents, especially for ground faults if system neutral is solidly grounded. A parametric fault analysis based on symmetrical components is applied to a sample HV system with three lines and two EHV points of supply, based on a simple meshed Italian subtransmission network. Results are then validated by detailed three-phase ATP-EMTP simulations. Values yielded by the parametric study confirm the expected increase of all fault levels, reaching up to 36% and 69% for three-phase and 1-phase-toground faults, and even 104% for the ground current of phaseto-phase-to-ground faults. All calculated values are however tolerable, with fault currents well within the operating envelope of devices and components; cross-bonded sheaths also significantly relieve substation grounding mats. Some consequences of undergrounding such as reduction of earth-fault factor may be actually beneficial.

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Improved analytical expressions for the reduction factor of feeding lines consisting of three single‐core cables

Popovic¹

2007

Int Trans Elec Energy Syst

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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 contemporary power engineering practice due to at least two important reasons. One of them is the possibility to a correct estimation of dangerous potential differences, touch and step voltage, which may appear during a ground fault at grounding system of the supplied station. The second reason is the possibility to choose single-core cables of the feeding cable lines with a metallic sheath cross-section large enough to withstand thermal strains caused by fault currents. The final result of the use of the analytical expressions derived here is the possibility to determine safe and cost-effective solutions regarding the grounding systems of the supplied stations and regarding the cross-sections of the metallic sheaths of single-core cables. The validation of the derived expressions is verified by experimental measurements.

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Determination of the reduction factor for feeding cable lines consisting of three single-core cables

Cited by 33 publications

References 7 publications

Ground Return Current Behaviour in High Voltage Alternating Current Insulated Cables

Ground Return Current Behaviour in High Voltage Alternating Current Insulated Cables

Fault current increase due to the progressive undergrounding of a HV subtransmission network

Improved analytical expressions for the reduction factor of feeding lines consisting of three single‐core cables

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