Diseño y construcción de un autotransformador trifásico de tres devanados para el Laboratorio de Sistemas Eléctricos de Potencia

Abstract

A three-phase autotransformer with tertiary in delta is designed and built for the scale system of the Power Electrical Systems Laboratory. The design of each component of the autotransformer is made based on electrical engineering concepts, bibliographic references criteria and with the experimental support of a transformer factory. The autotransformer with tertiary in delta is designed based on the availability of a second-hand ferromagnetic core, with a power of 5 kVA between the windings of the autotransformer and a power of 1 kVA in the third winding. The high voltage winding of the autotransformer, with 220 V, contains fixed taps, with a range of +/- 5%, in steps of 2.5%, while the other windings operate at nominal voltages, the primary winding with 127 V and the tertiary winding with 220 V. After the design is completed, the three coils are built and mounted on the core. Holding elements are also built, such as presses and metal box. Open-circuit and short-circuit electrical tests are carried out on the equipment as a three-phase transformer and as a three-phase autotransformer. The parameters of the single-phase equivalent circuit, with their series and parallel branches, are determined from their results. The measured and calculated parameters are compared with one of the referred standards.