Results of continuous transient voltage measurement in the Dutch 110kV grid

Since desk studies mainly provide a theoretical view, it is interesting to actually measure transients in transmission grids. To get better insights in voltage waveshapes, statistics (of amplitudes, frequency of occurrence and duration) and frequency contents, a transient measurement device has been installed on a 110kV power transformer in the Dutch grid. The outcome can be used to update the current insulation coordination policy of TenneT [1] in the