A method to evaluate voltages to earth during an earth fault on a HV network in a system of interconnected earth electrodes of MV/lv substations

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Abstract

An easy and swift method to evaluate, in a system ofinterconnected earth electrodes, earth potentials on earthing systems of medium-voltage/low-voltage (MV/LV) substations, in anevent of single-line-to-earth fault inside a high-voltage/mediumvoltage (HV/MV) station, is presented. The advantage of themethod is the simplicity of the mathematical model for solvingcomplex systems of any size with a sufficient accuracy for practicalpurposes. This paper shows the results of simulations, performedon networks with different extensions and characteristics, organized in easy-to-read graphs and tables. A comparison of theseresults with the values obtained according to the procedure explained in the IEC-Standard 60909–3, and a study on the accuracyof the method has been made. Moreover, some considerations onthe inclusion of earth electrodes of HV/MV stations within globalearthing systems are done.
Original languageEnglish
Pages (from-to)1763-1772
Number of pages10
JournalIEEE Transactions on Power Delivery
Volume23
Publication statusPublished - 2008

All Science Journal Classification (ASJC) codes

  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering

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