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Frequency - historical data
Frequency of the Nordic synchronous system with a 10 Hz sample rate.
The frequency measurement data has been divided into archives consisting of monthly frequency measurement data. Within the archives, the data is divided into daily CSV-files that can be manipulated using common data analysis software.
The frequency is measured at 400 kV substations at different locations in Finland with a sample rate of 10 Hz. The data may contain some gaps due to telecommunication errors etc. The times are according to UTC+2 / UTC+3 during daylight saving time period.
