Visualization of power quality data

The visualization of massive amounts of data is a challenge for the evaluation of power quality, where hundreds of data points per second and location can be generated. Based on the theoretic foundations of data visualization, common visualizations for the current state of power quality as well as aggregated values are reviewed and analyzed. For several examples, the mapping from data point properties to visual dimensions is shown and discussed, highlighting the importance of the definition of exact goals for a visualization and illustrating possible pitfalls. In particular, the challenge of visualizing norm compliance is discussed and a proposal for a suitable plot type is made.