6. Getting the power away

Suitable electrical connections from the generators on the Severn Barrage to the 400kV substations on the shore are identified together with suitable reinforcements for the 400kV national grid. How the proposals were reached together with the studies done to check their principal features are described. Load flows and fault studies show that some unconventional solutions are required for both the low voltage and the high voltage systems. Generating and pumping modes have been considered. Reliability is a prime factor in the design and physical constraints are taken into account.

• GENERAL DESIGN CONSIDERATIONS

• GENERATOR CONNECTIONS

• BARRAGE SUBSTATIONS

• CABLE COMPENSATION

• CABLE RELIABILITY

• SYSTEM EARTHING

• ALTERNATIVE 8.6kV CONNECTIONS

• ARRANGEMENT OF ELECTRICAL EQUIPMENT

• GENERATOR CONTROLS

• SYSTEM STUDIES

• GRID REINFORCEMENT

• STABILITY

• COSTS OF GRID REINFORCEMENT