Kenneth John Nixon, Student no: 9307628H, PhD thesis, Electrical & Information Engineering, Faculty: Engineering & the Built Environment. 2006. / The work presented extends and contributes to research in earthing and lightning
protection and focuses on the transient behaviour of a driven rod earth electrode.
Although previous work in this area has produced practical guidelines and models
that may be used for lightning protection system design and analysis purposes, there
has not been an investigation into the commonly encountered scenario of multiple
layers of di erent soil types, particularly where high current densities cause ionisation
to occur in the surrounding soil. In the research presented, the behaviour
of a practical driven rod earth electrode subjected to peak impulse currents of up
to 30 KA is analysed. Measurements obtained using a large-scale experiment arrangement
are compared against results obtained using a time-domain circuit model
simulation. It is shown that a single apparent resistivity value calculated from the
steady state resistance equation and the measured steady state resistance can be
used as a simpli cation for modelling the lightning current transient behaviour of a
driven rod earth electrode in multi-layer soil. This represents a unique and valuable
contribution to engineers working in the eld of earthing and lightning protection.
| Identifer | oai:union.ndltd.org:netd.ac.za/oai:union.ndltd.org:wits/oai:wiredspace.wits.ac.za:10539/2213 |
| Date | 07 March 2007 |
| Creators | Nixon, Kenneth John |
| Source Sets | South African National ETD Portal |
| Language | English |
| Detected Language | English |
| Type | Thesis |
| Format | 1322535 bytes, application/pdf, application/pdf |
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