Wraysbury Substation HV Switchboard Upgrade

The project was part of a strategic upgrade in which a new HV switchboard was installed to provide additional flexibility in the Network Rail 33kV distribution network.

Antagrade took responsibility for civil and electrical design and implementation works involving reconfiguration of the substation and phased changeover of essential connections to the HV network. All electrical design was carried out in-house, with a new switchboard and connections to power and peripheral systems installed, tested and commissioned to a challenging programme to meet new train service requirements.

The design and build package included all proposals for layout, interconnection, testing and integration and required structural modifications to the building as well as the provision of an innovative bunded shelter for outdoor transformers (the site was located between freshwater lakes in rural Surrey).

The works were further complicated by the inadequacy of the original 1950s cabling and supervisory system to accommodate the control and communications requirements of the latest switchboard and protection systems. By using local gathering and transfer, data was relayed between site and control room via adjacent substations, generating communications duplication capacity and thereby providing increased system availability.

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