In order to avoid line stops caused by voltage deviations, the solution for the sample line would be an Active Voltage Conditioner (AVC). The AVC protects the plant power supply against excess and under voltage via a continuous voltage control. The effect of the AVC is symbolized by the blue dots in the chart above. They stand for voltage correction to each single yellow voltage dip or peak. Most of the voltage deviation could be corrected to 100%.
However, three voltage dips were dramatically lower than 70% at the sample line (no. 1 in the chart). Nonetheless the AVC could shift these events up to more than 95% (no. 2), i.e. within the limits of the European norm.
Using an Active Voltage Conditioner, the reported voltage deviations would not have stopped production.