Apr 2013
Electricity Transmission
Bus Transfer Capability
Apr 2013
National Grid Electricity System Operator
National Grid TO Innovation Team
Click here to send a question to the contact.
Innovation Funding Incentive
Asset Management
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 transmission system.

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.

The project has the following objectives:

  • Investigate the effects of bus transfer duty on the Committee design of disconnectors

  • Investigate a solution to modify/retro-fit Committee design disconnectors to provide them with a Bus Transfer rating as per current IEC/National Grid standards.