Phase co-ordinate approach to calculate earth-fault current and shock voltage

Author

Teo, C.Y. ; He, W.X. ; Chan, T.W.

Author_Institution

Sch. of Electr. & Electron. Eng., Nanyang Technol. Univ., Singapore

Volume

144

Issue

6

fYear

1997

fDate

11/1/1997 12:00:00 AM

Firstpage

441

Lastpage

445

Abstract

The paper summarises an alternative approach for the calculation of earth fault currents and shock voltages for low voltage systems up to 1000 V without using the conventional symmetrical components. As the shock voltage at each section of the installation has to be modelled during fault conditions, the system equations are formulated entirely in the phase co-ordinates including the representation of neutral and grounding conductors. Test results on two different earthing systems demonstrate the ability in modelling the untransposed cable parameters and the influence of the unbalanced load currents on the postfault voltages. More accurate results can thus be obtained as compared with other methods of calculation

Keywords

conductors (electric); earthing; electric shocks; fault currents; 1000 V; earth-fault current; fault conditions; grounding conductors; low voltage systems; neutral conductors; phase co-ordinate approach; postfault voltages; shock voltage; system equations formulation; unbalanced load currents; untransposed cable parameters;

fLanguage

English

Journal_Title

Electric Power Applications, IEE Proceedings -

Publisher

iet

ISSN

1350-2352

Type

jour

DOI

10.1049/ip-epa:19971420

Filename

641923