Case Study – O’Connor Utilities Limited

Product: LOADMON 50

“Engineering Design is the art of detailed prediction. Using the right tools ensures confident prognosis and accurate route design.”
-Gregory Papaioannou, Civil Engineer (MSc), O’Connor Utilities Ltd

Gregory is a zealous professional engineer with clear understanding of the goals and responsibilities associated within the construction industry.

He is engaged in providing support for multiple concurrent projects, embraces change and utilizing available resources.

While completing electrical route designs for several schemes, Gregory undertook a design study for the installation of new 132kV aluminium 1400mm2 cables within 160mm ducting to connect the Galawhistle wind farm to a substation in the rural area of Coalburn, South Lanarkshire.

The total installed cable length was 4km.

To pull EHV cables, an engineer needs to determine whether the preliminary designed route satisfies several criteria.

The geometry has to accommodate physical limitations and the calculations need to account for the geographical characteristics of the area.

With the trench sections being concealed, there is no way of knowing what the cable will encounter.

Unlike traditional dynamometers, LOADMON 50 provides data regarding the stresses on the cable and not on the winch.

Gregory was able to monitor the unground cable and to receive information from the cable pull that was previously unavailable, enabling him to improve the accuracy of his generic route design calculations.

Whilst installing the cable, it was found that the tension on the cable, measured by LOADMON 50, was approximately 30% less than that predicted by the calculation. From this, we have been able to improve our design algorithm and apply it to other cable designs enabling the possible implementation of longer cable sections with no risk and at reduced installation cost. We also have a record of tension against distance for the cable as it was installed and can verify to the end customer that the cable was not over-pulled during installation.

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