About Measurement System in Stations and Substations using Original Data Acquisition Systems

The paper deals with a method and measurement system designed for the simultaneous monitoring and recording of time variations of electric quantities with no inter-correlation requirements. The method and measurement system were obtained by realizing a multi-unit data acquisition system (MUDAS), relying on at most 3 independent data acquisition systems which operate jointly, in a synchronous way, by means of a synchronizer. Because each of the individual data acquisition system can acquire data for at most 8 electrical quantities (4 voltages and 4 currents), the maximum total number of electrical quantities to be monitored, acquired, and transferred simultaneously to a central control unit is equal to 24. The sampling rate allows for the determination of power quality parameters according to existing standards. MUDAS can also be used in a structure with only 2 individual data acquisition system, in order to simultaneously acquire and display at most 16 electrical quantities. Two examples of utilization of MUDAS are presented.