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This paper describes a voltage regulation method for distribution substations equipped with on-load tap changers. The method has been developed with a view to achieving the entire regulation of a substation using small-scale computer-based equipment. This regulation method applies to either single or parallel transformers that may or may not have similar characteristics (power rating, impedance, number of taps, dynamic range of regulation). In addition, it can also be applied to compensate for the load drops on feeders. Besides offering great flexibility for regulation itself, computer-based equipment is very appropriate for remote changes of voltage settings.