EARTHING STUDIES

We worked closely with another well known engineering company to provide specialist earthing stud for a Gas Terminal, Co. Mayo. The Terminal is an onshore gas processing facility that will provide up to 60% of Ireland’s gas at peak supply. We conducted an engineering study to determine if earthing grids installed at the facility were compliant with IEEE80.

INDUSTRY SUCCESS

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offshore exploration and option licences issues in Ireland in 2014

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barrels of oil thought to be in oil field off coast of Cork

80

 of Ireland’s energy fueled by oil and natural gas

THE CHALLENGE

The Terminal was constructed on an excavated bog. The majority of the terminal site was constructed on bedrock which is not conducive to a suitable earthing system. Earth grids were therefore installed in bog soils adjacent to the terminal site but at a distance away from switchrooms. We had to determine if the earth grids would create dangerous touch and step voltages during electrical faults.

HOW WE HELPED

We conducted a detailed analysis of the earthing grids at the terminal site. A software simulation was developed that reflected the characteristics of the soil and the copper conductors placed in the ground at the terminal site. The software model was utilised to analyse the touch and step voltages that would be observed during faults.

THE RESULT

During the earthing study we determined that the earth grids were sufficient to ensure that touch and step voltages were within limits guided by IEEE80. As a result, the client did not have to make alterations to existing installations and the proposed fencing off of the ground above the earth grids or the placement of rock or crushed stone was not required.

THE CLIENT

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"During our earthing study we modelled the earth grids and were able to identify that the earth grids designed were within the limits imposed by IEEE80. These studies are of critical importance in the design of substations and ensure the safety of workers both within and outside of the substation fence boundary"

Alan O'KellyDirector

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