Evaluation of Variation Ranges of Phase Voltages and Ground Currents in Three-Phase Unearthed Networks With Diode Rectifiers

Piotr Olszowiec

Abstract


Operating parameters of electrical networks such as phase voltages, leakage and ground fault currents are decisive for safe operation of low-voltage unearthed networks with diode rectifiers. The knowledge of maximum possible values of network operating parameters is necessary for correct assessment of numerous hazards. So far no simple methods of determination of the highest levels of these parameters in AC/DC IT 3-phase networks have been available. The present paper reports a new approach to the evaluation of the variation ranges of the operating parameters of these systems using Mathcad.

Keywords:
Diode rectifiers; ground-fault current; insulation resistance; leakage current; phase voltage; three-phase networks.

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References


P. Olszowiec, Insulation Measurement and Supervision in Live AC and DC Unearthed Systems, Springer 2012, vol. 167, ISBN 978-3-642-29754-0, pp. 5–15.

W. Hofheinz, Protective Measures with Insulation Monitoring, VDE Verlag, 2006. pp. 63–72.

C. Olszowiec and P. Olszowiec, “Evaluation of Variation Ranges of Electrical Parameters in Three-Phase Unearthed Networks,” Computational Problems of Electrical Engineering, 2014, vol. 4, no.1, pp. 51–54.

E. Ivanov, “Kak prawilno izmieriat soprotivlenije izolacji elektroustanovok,” Novosti Elektrotechniki, 2002, no. 2. (in Russian), [Online]. Available: http://www.news.elteh.ru/arh/2002/14/26.php

P. Olszowiec, “Application of Network Voltages for Insulation Monitoring in Unearthed AC Circuits with Rectifiers,” Pomiary, Automatyka, Kontrola, 2013, no. 12, pp. 1252–1255.




DOI: 10.7250/pee.2016.010

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