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Power-line flicker
Power-line flicker is a visible change in brightness of a lamp due to rapid fluctuations in the voltage of the power supply. The voltage drop is generated over the source impedance of the grid by the changing load current of an equipment or facility. These fluctuations in time generate flicker. The effects can range from disturbance to epileptic attacks of photosensitive persons. Flicker may also affect sensitive electronic equipment such as television receivers or industrial processes relying on constant electrical power.〔''IEEE Standard 519 Recommended Practices and
Requirements for Harmonic Control in
Electrical Power Systems'' section 10.5 ''Flicker''〕
==Causes==
Flicker may be produced, for example, if a steel mill uses large electric motors or arc furnaces on a distribution network, or frequent starting of an elevator motor in an office building, or if a rural residence has a large water pump starting regularly on a long feeder system. The likelihood of flicker increase as the size of the changing load becomes larger with respect to the prospective short circuit current available at the point of common connection.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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