What is Line Regulation？
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05/20/2025
Definition: Voltage regulation (or line regulation) refers to the variation in voltage at the receiving end of a transmission line when the full load at a specified power factor is removed, with the sending-end voltage maintained constant. In simpler terms, it is the percentage change in the load-end voltage when transitioning from no-load to full-load conditions. This parameter is expressed as a fraction or percentage of the receiving-end voltage, serving as a critical metric for assessing the stability and performance of electrical power systems.
The line regulation is given by the equation shown below.
This phenomenon underscores how reactive power flow—dictated by power factor—alters voltage distribution along the transmission line.
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