What happened to Underground Power Cable Line after finished Lifetime:
What will be
happen to underground power transmission line at end of service life, the cable can be recovered for recycling or
left in place forever.
In
conventional overhead power transmission line, every part of material including
conductor is easy to recollect and recycling.
Direct buried cable is not so easy to recollect from 1.5 meter
deep earth, but lots of oil-filled cable which already buried and we can’t just
left in place after end of their service life, they are containing some
hazardous materials, leaking oil to vicinity for long time!
Good news is that, modern special graded XLPE cables replacing
older oil-filled cable technology, polyethylene which has cross-linked molecules
to allow extremely high temperature without melting.
Typically each circuit line has 3 conductors and the amount of
copper up to 25 tons per kilometer for a larger size core. This hues amount of copper
can recycle into same graded copper which can recover plant cost and keep
positive footprint for carbon-di-oxide emissions.
During plan and design a new underground power transmission line
project, it should consider the recycling of cables. Route line selection and
laying procedure should be well-matched to cable recycling in future.
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