National Grid Electricity System Operator
National Grid TO Innovation Team
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Innovation Funding Incentive
High Voltage Technology
There have been a number of incidents worldwide where
transformers and reactors have failed in service due to corrosive
sulphur. This is an emerging problem which is not fully understood
and may have implications across National Grid's population of oil
To develop knowledge of the chemical fingerprint of electrical ageing
and degradation processes as they apply to small oil volume
insulation systems. To use this knowledge to develop novel
diagnostic techniques for analysis of oil using millilitre samples, to
enable sampling and condition monitoring on a regular basis, such
that potential problems can be identified in good time.
To simulate, in the laboratory, the degradation processes seen in
silicone oil insulated cable sealing ends and to develop a sufficient
understanding of these processes to facilitate the analysis of
samples taken from the field in order to provide a measure of asset
This combination of projects addresses the oil technology issues
related to sulphur on oil, analysis of small oil volume equipment and
the analysis of silicon oil degradation.
The objective of the sulphur in oil investigation is to trial on a
selection of transformers/reactors the possibility of removing
corrosive sulphur through oil reclamation and the addition of inhibitor
in the oil. This project will involve a number of external companies
(ABB in Sweden, Doble Power Test and Sea Marconi) in order to
carry out the testing of the oil during the various stages of
reclamation. The reclamation of the oil will be done internally by
National Grid's Oil Management Unit (OMU). It is intended to select
a number of transformers and reactors to carry out the trial on.