When you have all the measurement data, the analysis of power quality information starts. It is the most difficult step as there is no best practices or procedures. The more analysis you perform, the easier it is.
Some issues to remember:
  • Understand the meaning of data, not just values. For example, high THD when load is very low is not an issue.
  • Compare the harmonics with and without the capacitors (and with different sets of capacitors)
  • Browse the data as one continuous situation, usually events are related to each other
  • Standards are for guidelines only, particularly EN 50160 which is mainly statistics
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