Mejoramiento de la coordinación de aislamiento en subestaciones mediante el estudio y análisis de viabilidad en reproducir la reducción de BIL

Abstract

This article aims to improve the insulation coordination of an electrical substation through the feasibility of reducing the Basic Insulation Level or the corresponding Standard Lightning Impulse Withstand Voltage defined in IEC 60071. The upgrade was made to a 230 kV substation based on the methodology developed in IEC 60071 (1 and 2) with a single surge arrester per phase. Given the above, some of these equipment must meet type II requirements. Under the same methodology, the calculation of an improved insulation coordination was carried out, which implied the modification of the bay design in the parameters associated with a second added surge arrester with the same characteristics as the initial one. Thus, an improvement was obtained in the required tensions supported in the aforementioned equipment, reducing the BIL levels. The result is a feasibility of both technical and financial project execution; evidencing a reduction in tensions.