The project scope included the detailed design of the 11kV HV network, replacement of aging HV switchgear, HV earthing system design, fault level and load flow analysis, and the development of a complete, coordinated protection study to ensure safe, selective and resilient operation under all operating conditions.
A key element of the scheme was the integration of a complex LV generation system. This included the design of a sophisticated control and protection architecture to enable multiple generators to operate in parallel, providing a highly resilient standby power solution. The system was engineered to support both island mode operation and full compliance with G99 requirements, allowing safe and controlled parallel operation with the distribution network while maintaining continuity of supply during grid disturbances or outages.
The earthing strategy was a critical and technically challenging aspect of the project. The HV network was designed around a resonant (Petersen coil) earthing system to limit earth fault currents, improve network availability and reduce damage during earth fault conditions.