Some power quality (PQ) potential problems have very few outwardly detectable signs. Voltage sags are called blinks in some trouble reports as the lights have a noticeable change in intensity, as does voltage fluctuations...

With the unprecedented amount of unregulated information available on the internet, one can find a wealth of facts and fiction on a given subject. Power quality is no exception. Even those skilled in the art can be misled by...

In my 40-plus years in the industry, I have analyzed customers’ power quality monitor data files and heard their stories about hundreds of things that have happened in their facilities or homes: some mysterious, some...