Electricity North West Limited
Electricity North West Innovation Team
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Innovation Funding Incentive
High Voltage Technology
This project is to use the recently commissioned ENWL portable oil
regeneration unit, based at our Central Oil Reprocessing Depot (CORD) in
Blackburn, Lancashire to undertake oil regeneration on a sample primary
transformer within the ENWL estate with the aim of deferring replacement of
the identified unit beyond at least financial year 2017/18.
The oil regeneration process consists of connecting the regeneration unit into the
oil circuit of the transformer and then pumping the oil through various
sieves, filters and heaters to remove impurities and dry the oil. In order to
ensure this is economically viable it is essential to properly understand the
effect of the regeneration on the transformer oil condition and the
subsequent rates of deterioration following the proposed intervention which
is made more difficult due to the loss of historical oil data held in the
Following the DPCR5 settlement it is now necessary to investigate
alternative transformer management options that have previously not been
considered and the technique that would appear to offer the greatest
opportunity to improve the transformer Health Index (HI) and thereby extend the
operational life is transformer oil regeneration. The aim is to test the
efficacy of oil-regeneration as a reliable asset management technique. In addition Manchester University have been recruited to analyse
the performance of the oil regeneration.