National Grid Electricity System Operator
National Grid TO Innovation Team
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Committee designed disconnectors do not have any on-load bus transfer rating
but they are expected to perform this duty in their locations on the electrical
Their design is based on requirements dating back 30-40 years and they do
not fulfil the performance requirements of having an on-load bus transfer
capability when compared to modern day specifications.
In some cases operation of the assets leads to damage to the equipment and
therefore attracts associated OMGS costs for repairs and significant work has
been required to repair the damage.
These disconnectors will be on the system for a considerable number of years
to come and are being re-used in Capital schemes, albeit without having a
rated bus transfer duty. As a result National Grid will continue to operate and
maintain this equipment with the operational inflexibility and continued damage
to the equipment unless a modification/retro-fit option can be developed.