What you can't see..

This case was a colleague attending a MV cable fault in an offshore wind farm.

Starting point for any cable fault of this type is to determinate the location, this is normally done in two steps. Fault location – this gives a rough estimate of the location followed by a more precise effort, pin-pointing, this establishes the location within one or a few meters.

In this instance the cable fault was located on land, and while removing the backfill it was discovered that a lot of construction waste had been buried with the backfill.

 > > Imagine that - construction waste compromising your critical cable system, bad news!

That is bad news to any cable owner or operator because the thermal conformity of the backfill is vital for the capacity of the cable system, especially air pockets can be a real culprit.

 > > Maybe there is a novel thermal simulation behind it, or maybe someone made a Houdini-trick on the construction waste to save time, who knows…

The point is: Compromising the backfill is not a good idea. 

What are the costs?
1# capacity bottleneck limits your wind farm production and in the end this will reduce your bottom line.

2# failure to this particular system resulted in complete loss of production, increased maintenance costs during down-time and while restoring the systems.