Disturbance data storage from digital protective devices



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    An important function of digital protection is to store disturbance records for more accurate analysis of critical events in the grid. As the memory for such records is limited in the relay it has shown convenient to extract them by use of standardized communication and store them on a hard disk on station level for further use.

    Serial communication of digital protective devices to Substation Control Systems has been standardized and published as IEC standard protocol 60870-5-103. Recently the new standard for power utility communication IEC 61850 has added much more flexibility and performance to data exchange with different IEDs.

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