Power distribution transformers using natural ester fluids as dielectric and coolant

Abstract

Abstract− Researches related with the use of Natural Ester Fluids as refrigerant of power transformers has been developed in other countries with successful results. In Colombia there is no a procedure to control the use of these esters in electrical apparatus, so the current implementations are regulated by NTC 1465 standards for mineral esters. This new proposal involves the composition and the most relevant properties (the ignition resistance, impact on the lifetime of the insulating papers and the impact on the environment), which makes the application of natural esters fluids advantageous not only to preserve the environment but also to get a better performance of power transformers.Keywords− Natural Ester Fluid, distribution transformers, electrical apparatus, environment, chemical properties.Resumen− Las investigaciones en desarrollo respecto al uso de aceites de origen vegetal como refrigerantes en transformadores de distribución han tenido resultados destacados en otros países. En Colombia no existe un procedimiento para monitorear la aplicación de estos aceites en equipos eléctricos, por lo tanto la actual implementación se regula por la norma técnica NTC 1465 para aceites de origen mineral. Esta propuesta de nueva tecnología contempla la composición y las propiedades más relevantes (resistencia a la ignición, impacto en el tiempo de vida del papel e impacto en el medio ambiente), lo cual provee de mayor número de ventajas al aceite vegetal y un mejor desempeño en eficiencia. Palabras clave−

Various Aging Processes in a Paper-Natural Ester Insulation System in the Presence of Copper and Moisture

“…As described above with cellulose paper, the technical life of natural esters depends on the raw materials from which they are made (internal factors) as well as the environment to which they are exposed (external factors). The major degradation processes of natural esters are hydrolysis [28], polymerization [29], oxidation [30], and hydrogenation [31].…”

Influence of Photovoltaic Systems on Power Quality Problems

“…To determine the state of the power quality losses at the two points evaluated, the frequency variation is initially verified according to the criteria of NTC 1340, taking measurements every 10 s and using a frequency range between 59,8 Hz and 60,2 Hz (Norma Técnica Colombiana NTC 1340 -Electrotecnia. Tensiones y Frecuencia Nominales en Sistemas de Energía Eléctrica en Redes de Servicio Público, 2013;Silva Ortega et al, 2016). Similarly, the nominal value of the voltage can be 5% above and 8% below.…”