Technical aspect of reconstructions of 35 kV and 10 (20) kV plants with an example

Abstract

At the beginning of the electrification of Dalmatia in the middle of the last century, a large number of 35/10 kV substations were built, in which 35 kV and 10 kV plants were installed inside cells (vertical partitions, so called ‘’monijerka’’). Since the substation TS 35/10 kV POSTIRA was put in operation, only the necessary repairs have been made for the maintenance of the substation. A growth in the number of consumers caused by an increasing construction of residential and commercial buildings required a reconstruction of the substation’s equipment. The reconstruction of TS POSTIRA is designed in a way to maintain the existing dimensions of the premises while incorporating modern equipment with increasing strength. During the execution of the works, a special engagement of all the participants in the construction was necessary due to the reconstruction of the substation without interrupting supply of customers (part of the plant was constantly under voltage). This paper presents solutions and the method of reconstruction of TS 35/10 (20) kV POSTIRA.