Vliv UPS na harmonické v napájené síti telefonní ústředny Dolů Bílina

Abstract

The topic of this diploma thesis is as follows problems caused by interruptions to supply networks by nonlinear devices, in other words it deals with interruptions to supply networks caused by UPS backup systems of the telephone exchange, Severoceske Doly, located in Bilina. First part is devoted to a general description of electromagnetic compatibility issues and harmonic ones within electrical networks. Here we have a description of causes of the interruptions, the impact of these interruptions to the equipment, supply network and possible ways to reduce these interruptions. Other part of this work already solves the interruption issues that originate in the supply network of the Doly Bilina telephone exchange. It suggests several technical measures to reduce the interruptions. It also includes a description of already mentioned supply network followed by an analysis of results that came from measuring harmonic higher orders. It also describes retroactive effects of nonlinear devices on this supply network. Here we also deal with a practical design of a suppression filter with a measuring of the supply network after its use. The last part already deals with the economic aspects of possible techniques that can reduce interruptions to the telephone exchange supply network.