Computerised supervisory control systems have been in operation in many countries for the past 10 to 15 years. The systems performance requirements are influenced by an arena of rapidly advancing technologies and a highly competitive business environment. There is multitasking of the use of microprocessors in power system control. This paper concerns four critical applications of the use of SCADA, system protection, metering, high-speed data exchange and distribution network automation. Specific information is given concerning system hardware. The advantages of the use of SCADA are explained and discussed. The detail of a power system under study is presented and commented on.
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