Control and instrumentation design

The paper opens with a discussion on the environment and variety of equipment with which the C&I design engineer has to be familiar, in order to implement a design philosophy. The fundamentals of that philosophy, the concept of centralised control and the criteria for choice of local controls, are then discussed. The flow of energy through the power station is followed, and important aspects of C&I are reviewed at significant items of plant, beginning with the boiler, which features many interactive controls. The turbine generator C&I is then considered, and the hierarchical differences between local control systems, the governor and the turbine supervisory equipment are discussed. Details are given of the extensive data logging and computation equipment, and the paper concludes with a discussion on the problems of reconciling the need for proven design with the very fast developments in this area of engineering.