Microprocessor Control of Power Plants - Needs and System Aspects

The telephone switching offices in Sweden range from very large city exchanges down to small units in sparsely populated areas. There is an ongoing effort to increase the number of exchanges being operated unmanned and to reduce the amount of visits to the stations for operation and maintenance work e.g. at the power supply installation. This paper will show how these needs can be fulfilled by using a microprocessor control system intended for small exchanges and concentrators as well as for supervision of our largest installations. A system layout is described which offers selective information regarding alarm and operation state of the power supply equipment and which is independent of the power equipment make. It is also shown how the system design takes advantage of the alarm routines of the switching equipment in order to achieve an integrated operation organisation.