Operational control of electricity supply systems

Supervisory equipment for the remote control of plant has proved to be thoroughly reliable and to facilitate efficient operation of electricity supply systems. This paper gives the reasons for, and the steps taken to develop, the common-diagram control system, which enables an almost unlimited number of substations, etc., to be completely controlled from one diagram and control panel and is sufficiently flexible to cater for the growth of the undertaking. It describes a wall-type system diagram which automatically indicates which substations have changed conditions, and therefore the area involved in any disturbance. The system diagram is equally extensible to accommodate new feeders and substations, with a minimum of operating disturbances.Particulars of the circuits and apparatus, and comparisons of floor area, pilot and cost economies are given; also information of an installation dealing initially with 78 substations, to which others are being added.