Transient performance of substation structures and associated grounding systems

Journal Article · Mon May 01 04:00:00 EDT 1995 · IEEE Transactions on Industry Applications

DOI:https://doi.org/10.1109/28.382112· OSTI ID:55484

Dawalibi, F P; Xiong, W; Ma, J ^[1]

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1. Safe Engineering Services and Technologies Ltd., Montreal, Quebec (Canada)

When lightning strikes an electric substation, large currents generated by the stroke flow in the above ground structures and grounding system and dissipate in the soil. The electromagnetic fields generated by such high currents may cause damage to equipment and may be dangerous to personnel working nearby. In this paper, the frequency and time domain performance of a substation subjected to a lightning strike is described and discussed. The computed scalar potentials, electric fields, and magnetic fields are presented graphically as a function of spatial coordinates, as a function of time and as a function of both. Two cases are considered. The first case examines the substation grounding system only, while the second case includes an above-ground structure as well. It is believed that the results of the second case have not been published before. A double exponential lightning surge current is injected at one corner of the substation. The response of the grounding system to the frequency domain electromagnetic spectrum of this signal is computed by a frequency domain electromagnetic field analysis software package. The temporal and spatial distributions of the electromagnetic fields inside and near the substation are obtained by an inverse Fourier transformation of all these responses. The presence of a soil with an arbitrary resistivity and permittivity is accurately taken into account. The analysis sheds some new light on the understanding of the effects which take place at the higher frequencies.

• OSTI ID: 55484
• Journal Information: IEEE Transactions on Industry Applications, Journal Name: IEEE Transactions on Industry Applications Journal Issue: 3 Vol. 31; ISSN 0093-9994; ISSN ITIACR
• Country of Publication: United States
• Language: English

Related Subjects

24 POWER TRANSMISSION AND DISTRIBUTION
ELECTRIC GROUNDS
ELECTRICAL TRANSIENTS
ELECTROMAGNETIC FIELDS
HAZARDS
LIGHTNING
POWER SUBSTATIONS