When checking for power quality, which parameter is NOT typically assessed?

In the context of assessing power quality, the focus is primarily on measurable electrical parameters that directly affect the efficiency, performance, and reliability of electrical systems. Voltage levels, current fluctuations, and frequency of the electrical supply are all critical factors that can impact how electrical equipment operates.

Voltage levels provide insight into whether the electrical supply is within specified limits, as deviations can lead to equipment malfunction or damage. Current fluctuations are significant since they can indicate load imbalances or transient events that affect system stability. Frequency, typically maintained at 60 Hz in North America or 50 Hz in other regions, is vital for synchronous operation of generators and motors; deviations can disrupt operations and performance.

In contrast, the sound of appliances, while perhaps indicative of an issue (such as mechanical failure or inefficiencies), is not a standardized parameter for power quality assessments. It is subjective and does not provide quantitative data about the electrical supply. Thus, it is not typically included in the technical analysis for power quality evaluations. This distinction is what makes the sound of appliances an irrelevant choice compared to the other measurable parameters.