# Determination of the scope of the experimental-calculation method for measuring the touch voltage

## Authors

• D. G. Koliushko National Technical University «Kharkiv Polytechnic Institute», Ukraine
• S. S. Rudenko National Technical University «Kharkiv Polytechnic Institute», Ukraine
• A. N. Saliba TMC Group, Lebanon

## Keywords:

electrical substations, grounding system, modeling of the electromagnetic processes, touch voltage, soil characteristics, short-circuit

## Abstract

The work is devoted to the improvement of methods for determining the normalized parameters of the grounding system (GS) of operating power stations and substations. The aim of the work is determination of the scope of the experimental-calculated method for measuring the touch voltage, depending on short-circuit (SC) current value for the given dimensions of the GS and the type of soil. Methodology. The study analyzed the non-linear effect of the SC current value on the touch voltage, taking into account such factors as the GS size and the soil type. The calculation used statistical data on the GS size and the characteristics of the soil obtained by monitoring the GS state of 585 operating electrical substations with a voltage class of 110-750 kV using the induction method and the method of vertical soil sounding, respectively. For the calculation, a mathematical model of a non-equipotential GS located in a three-layer semiconductor space with plane-parallel boundaries was used, this model was developed using the method of integro-differential equations. Results. To determine the scope of the method, in this work it is proposed to use the linearity criterion, which is determined due to the ratio of the constant of reduced touch voltage to the current value. The example shows the method for determining the threshold minimum and maximum values of the measuring current of the soil, in the range between which the measurements by experimental-calculated methods are impossible. A table of threshold current values has been formed and recommendations have been developed on the possibility of using experimental-measuring methods for determining the touch voltage depending on the GS size and soil characteristics.

## Author Biographies

### D. G. Koliushko, National Technical University «Kharkiv Polytechnic Institute»

PhD, Senior Research Scientist

### S. S. Rudenko, National Technical University «Kharkiv Polytechnic Institute»

PhD, Senior Research Scientist

## References

Rules of the device electroinstallations. General rules. Kharkiv, Mіnenergovugіllya Ukrayiny Publ., 2017. 760 p. (Ukr).

BS EN 50522:2010. Earthing of power installations exceeding 1 kV a.c. London, BSI, 2012. 104 р. doi: https://doi.org/10.3403/30191665.

Verordnung über elektrische Starkstromanlagen (Starkstromverordnung). Bern, Der Schweizerische Bundesrat, 2016. 34 p. (Ger).

Erdungshandbuch Regelwerk: Technik Eisenbahn. D RTE 27900. Bern, Verband öffentlicher Verkehr, 2014. 49 p. (Ger).

Errichtung von elektrischen Anlagen mit Nennspannungen bis 1000 V ~ und 1500 V = Teil 1: Begriffe und Schutz gegen elektrischen Schlag (Schutzmaßnahmen). (ÖVE/ÖNORM E 8001-1). Vienna, Österreichisches Normungsinstitut, 2010. 138 p. (Ger).

Koliushko D.G., Rudenko S.S. Analysis of methods for monitoring of existing energy objects grounding devices state at the present stage. Electrical Engineering & Electromechanics, 2019, no. 1, pp. 67-72. doi: https://doi.org/10.20998/2074-272X.2019.1.11.

Koliushko D.G., Koliushko G.M., Rudenko S.S. Statistical analysis according grounding grid the power stations and substations for of normalized parameters. Energy and Electrification, 2015, no. 6, pp. 3-7. (Rus).

Koliushko D.G., Rudenko S.S. The factors of the influence on the touch voltage from the review of the development of recommendations for the reconstruction of the grounding device. Technical Electrodynamics, 2019, no. 3, pp. 29-36. doi: https://doi.org/10.15407/techned2019.03.029. (Ukr).

Test and control devices, electrical grounding. Standard instruction. SOU 31.2-21677681-19:2009. Kyiv, Mіnenergovugіllya Ukrayiny Publ., 2010. 54 p. (Ukr).

Koliushko D.G., Rudenko S.S. Experimental substantiation of the calculation procedure of normalized parameters of grounding device based on the three-layer soil model. Electrical Engineering & Electromechanics, 2018, no. 1, pp. 66-70. doi: https://doi.org/10.20998/2074-272X.2018.1.11.

Koliushko D.G., Rudenko S.S. Determination the electrical potential of a created grounding device in a three-layer ground. Technical Electrodynamics, 2018, no. 4, pp. 19-24. doi: https://doi.org/10.15407/techned2018.04.019. (Rus).

Calixto W.P., Neto L.M., Wu M., Yamanaka K., da Paz Moreira E. Parameters Estimation of a Horizontal Multilayer Soil Using Genetic Algorithm. IEEE Transactions on Power Delivery, 2010, vol. 25, no. 3, pp. 1250-1257. doi: https://doi.org/10.1109/TPWRD.2010.2040845.

Kostić V.I., Raičević N.B. An alternative approach for touch and step voltages measurement in high-voltage substations. Electric Power Systems Research, 2016, vol. 130, pp. 59-66. doi: https://doi.org/10.1016/j.epsr.2015.08.023.

IEEE Std 80-2013 Guide for Safety in AC Substation Grounding. New York, IEEE, 2013. 226 p. doi: https://doi.org/10.1109/IEEESTD.2015.7109078.

IEEE Std 81-2012 Guide for Measuring Earth Resistivity, Ground Impedance, and Earth Surface Potentials of a Grounding System. New York, IEEE, 2012. 74 p. doi: https://doi.org/10.1109/IEEESTD.2012.6392181.

Koliushko D.G. Improving the diagnostics of grounding devices of electric power facilities. PhD dissertation. Kharkiv, NTU «KhPI», 2003. 172 p. (Ukr).

Letter No. 02-45-09/1875 NEC «Ukrenergo» Donbasska ES, 19.04.2005, Chief Engineer of Donbass Power Plant S.А. Kardashev. (Rus).

M. Telló, D. S. Gazzana, G. A. D. Dias, R. C. Leborgne, A. S. Bretas. New methodology to measure the grounding grid resistance of substations applying short distance among electrodes. Proc. 20th Int. Conf. Comput. Electromagn. Fields, Montreal, Canada, 2015, pp. 1-4.

Koliushko D.G., Rudenko S.S., Asmolova L.V., Tkachova T.I. Determination of the soil sounding depth for the earthing resistance calculation of substations 35 kV. Electrical Engineering & Electromechanics, 2020, no. 1, pp. 52-55. doi: https://doi.org/10.20998/2074-272X.2020.1.08.

Koliushko D.G., Rudenko S.S., Koliushko G.M. Analysis of electrophysical characteristics of grounds in the vicinity electrical substation of Ukraine. Electrical Engineering & Electromechanics, 2015, no. 3, pp. 67-72. doi: https://doi.org/10.20998/2074-272X.2015.3.10.

Rezinkina M.M. Simulation of electric fields in the presence of rods with rounded upper ends. Technical Physics, 2015, vol. 60, no. 3, pp. 337-343. doi: https://doi.org/10.1134/S1063784215030238.

Friedberg S., Insel A., Spence L. Linear Algebra. London, Pearson, 4th Edition, 2003. pp. 48-49.

2023-01-04

## How to Cite

Koliushko, D. G., Rudenko, S. S., & Saliba, A. N. (2023). Determination of the scope of the experimental-calculation method for measuring the touch voltage. Electrical Engineering & Electromechanics, (1), 77–82. https://doi.org/10.20998/2074-272X.2023.1.11

## Section

Electrical Safety