Chris Goodhand, Innovation Manager (01977 605641)
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High Voltage Technology
The GB electricity distribution industry continues to use a stay wire,
(anchor) rod and wood block combination to provide stability for
Overhead Line (OHL) supports.
Stay wires and rods will, depending on a number of circumstances,
degrade over their lifetime, typically 30 - 40 years. Failure of either can
lead to failure of the support, which in turn can lead to a cascade failure
of the line.
Currently the only reliable means of assessing the condition of entire
rods is through excavation, but this is expensive and not always
practical. Therefore once a defective stay wire has been identified Northern Powergrid
need to be sure of the integrity of the stay rod, otherwise that will be
replaced at the same time.
This is therefore extremely limiting and potentially restrictive to
maintaining an active condition assessment profile of the stays and
anchor assembly, as well as adding unnecessary costs to any