In order to maintain a safe and resilient network National Grid have a programme to replace their electricity transmission system assets including Surge Arrestors which are used to protect high voltage equipment in substations, such as transformers, against overvoltage caused by lightning or switching surges. National Grid undertake this replacement work using their own in-house resource but have engaged Omnia Projects to undertake Front End Engineering Design (FEED) for 97 sets of surge arrestors and detailed design for 41 sets.
The objective of the FEED is to identify which new surge arrestor should be used for the replacement to allow orders to be placed with manufacturers, and also to identify other work which may be required such as replacement of high frequency earthing and any new structures or adaptor plates requiring fabrication. The FEED assists National Grid clarifying the project scope and ensuring that long lead time equipment and material orders are placed in good time to meet the outage dates.
The detailed design comprising of producing an Approved for Construction drawing pack which the National Grid staff can use to undertake the installation work and ensures that the existing site records are amended to capture the changes associated with the project. This includes ensuring that any site mark-ups are captured during the as-built stage.
