ABSTRACT
Distribution systems must be designed in such a way that voltage magnitudes always remain within a speci–ed range as required by standards. is is accomplished through the use of voltage-control equipment and e›ective system design. Regulating power transformers (on-load-tap-changing transformers or OLTCs), three-phase step-voltage regulators, and single-phase step-voltage regulators are typical transformer-type equipment used to improve the voltage “pro–le” of a power system. Most of this section is dedicated to the single-phase step-voltage regulator, shown in Figure 8.1, used in substations and on distribution system feeders and laterals. Figure 8.2 shows the locations on a power system where voltage regulators are commonly applied.
