Utilities were the first to realize that they are responsible for the disturbances that occur on their power systems – transmission and distribution. Many events affect the operation of the power system – vehicle accidents, contractors digging holes, and thunderstorms to name a few. Even though the utility did nothing to cause these events, their customers still end up experiencing some type of voltage problem that might only have caused their lights to blink or might have caused an over-voltage condition that burned up many electronic ballasts or other electronic loads.
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