Dimensioning of nearby substations interconnected ground system

Sobral, S.T.; Costa, Vasco; Campos, M.S.; Goldman, Barry M.; Mukhedkar, D.

doi:10.1109/61.193961

Cited by 25 publications

(4 citation statements)

References 3 publications

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“…To simplify this circuit, we will use the decoupled technique [9]. This enables us to present separately the components of the fault current appearing in the metallic sheaths as a consequence of the inductive coupling with the faulted phase conductor and those components of the fault current appearing as a consequence of the conductive connection with the grounding electrodes at the ends of the cable line.…”

Section: Fault Place Anywhere Along the Cable Linementioning

confidence: 99%

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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Section: Fault Place Anywhere Along the Cable Linementioning

confidence: 99%

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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“…The impedance is a complex function of the design parameters of the cable and in a lower degree of the frequency and the soil resistivity along the cable, as shown in Carson's, Polloczech's, and Rüdenberg papers [4]. Since the cable sheath is relatively thin, the reactance due to the flux inside the sheath can be disregarded.…”

Section: A Fault Location In the Supplied Substationmentioning

confidence: 99%

“…The conductor 1 corresponds to the faulted phase conductors and the conductors 2 and 3 correspond to the two ground wires. Thus, on the basis of the decoupling technique (e.g., [4]), the presented model can be substituted by the equivalent circuit shown in Fig. 6.…”

Section: Cable Line Consisting Of Three Single-core Cablesmentioning

confidence: 99%

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

Popovic¹

2003

IEEE Trans. Power Delivery

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The paper presents an original analytical procedure for the determination of the ground fault current distribution in the cases when a feeding line is composed of three single-core cables. The procedure takes into account the existence of all three cable sheaths as the return path for the ground-fault current. The reduction factor for these types of cables as given by the cable manufacturer takes into consideration only the existence of the metal sheath of a faulted single-core cable. As a consequence of that, the estimations of the safety conditions (step and touch voltages) on the grounding systems of the supplied stations are too severe. For the high-voltage cables, a certain, sufficiently low reduction factor achieved by an increase of the sheath cross-section can be demanded from the manufacturer. In both cases, too conservative values for the reduction factor lead to unnecessary expenditures.The quantitative analysis performed in this paper shows that the reduction factor for three single-core cables belonging to the same line is significantly lower in comparison to the situation when each of these cables is treated separately.

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“…In other works [22,28,29,31,[35][36][37], a simpler procedure named "decoupled method" has been proposed, currently adopted by the International Standard (IEC Std 60909 -3, 2003).…”

Section: Introductionmentioning

confidence: 99%

A method for the evaluation of fault current distribution in complex high voltage networks

Zizzo

Silvestre

Cascia

et al. 2015

Electric Power Systems Research

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Dimensioning of nearby substations interconnected ground system

Cited by 25 publications

References 3 publications

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

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

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

A method for the evaluation of fault current distribution in complex high voltage networks

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