What is referred to as long duration voltage variation?

Long duration voltage variation specifically refers to situations where the RMS (Root Mean Square) voltage changes persist for an extended timeframe, typically exceeding one minute. This definition captures the essence of voltage variations that are sustained, contrasting sharply with other forms of voltage disturbances, such as transients, which are brief and occur over much shorter periods.

In the context of electrical systems, long duration voltage variations can significantly impact equipment performance, lead to inefficiencies, and affect overall reliability. Understanding this concept is crucial for operators and engineers who need to manage and mitigate the potential impacts of prolonged voltage fluctuations on both infrastructure and end-user equipment. It enables them to implement appropriate mitigation strategies and ensure system stability and performance over time.