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Investigation of earth potential rise on a typical single phase HV network

Faroughi, Shakib (2013) Investigation of earth potential rise on a typical single phase HV network. Other thesis, Murdoch University.

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The hazards from Earth Potential Rise (EPR) at existing distribution steel poles installed in a rural farming property were investigated. Different fault scenarios were identified as part of the project. The software package CDEGS was used to determine conservative allowable voltage criteria for the various fault scenarios and applicable fault clearing times. Touch voltages modelled in CDEGS were all below the allowable voltage criteria for the different size fault currents at all fault locations. Risk was calculated to quantify the hazard. The hazard from EPR can be considered low and the risk can be categorised as negligible.

Voltages were modelled in CDEGS to assess the impact on animals, especially cattle. These voltages were also below the tolerable voltage criteria for the different fault scenarios, hence no mitigation was required.

A safety analysis on the transfer to the Transmission Distribution -Multiple Earth Neutral (TD MEN) using the ARGON software package indicates that at the steel poles which have distribution transformers, the probability of fatality is already below 1 in 1,000,000 and can be further reduced by the installation of 6m deep earth rods adjacent and bonded to the steel poles. A study on increased generation caused increased fault currents which increased EPR levels causing a breach of allowable voltage limits and therefore creating a potential hazard at the site. Transmission level faults at the zone substation did not have an unsafe impact at the site.

Publication Type: Thesis (Other)
Supervisor: Crebbin, Gregory
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