Diagnóstico de transformadores de corriente y de potencial a partir de la evaluación y análisis de resultados de pruebas

Abstract

During the development of these internships, an investigation was made about the current and voltage transformers, and about the routine tests that are carried out to diagnose them. Likewise, and as a basis for the consolidation of this document, the electric models of the current and potential transformers were elaborated, with which it was possible to arrange a method for the calculation of the relationship and phase errors for a point of certain operation. Additionally, procedures were established for the execution of each of the tests that could be performed according to the type and characteristics of the instrumentation transformer. The validation of each test procedure required carrying out several tests on different transformers with the two test equipment on which this research is also based, the CT Analyzer for current transformers and the Votano 100 for voltage transformers, whose technology represents a great innovation in the field of routine trials in the field. Many of these tests took place directly at the sites of the final installation of the transformers. Several substations and power stations were visited in different departments of the country. With each executed trial, important information was acquired that was recorded in the elaborated test protocols. These not only allow the results and test conditions to be recorded after each test, but also allow them to be easily systematized in the company network, with the aim of developing the corresponding traceability of each equipment being tested, and allowing the results to be distributed whenever it is required by the technical staff of the company. This work allowed the company Wolta SAS to include tests for the diagnosis of instrumentation transformers within its service portfolio.