Abstract
DC high-speed circuit-breakers (HSCB) are the basic protection to cut off short-circuit and overload currents. People’s and railway infrastructure devices’ safety depend on their reliability and parameters. High-speed circuit-breakers, like any other electrical devices, display several electrical and mechanical characteristic parameters, which in many cases are interconnected. The article features these parameters of DC high-speed circuit-breakers that affect the operation safety of electric traction power supply systems. Moreover, it presents ways of their determination basing on laboratory and operational tests. Furthermore, requirements to be met directly and indirectly by DC high-speed circuit-breakers imposed by legal and standardization documents are described. Correlations between the breakers’ construction and their parameters are outlined. Basing on tests of leading European producers’ breakers, the article presents the impact of parameters of circuit where they are tested as regards HSCB parameters. It also deals with the problem of coordination of short-circuit protection and breaking currents of low values with respect to high-speed circuit-breakers used in Poland.
Highlights
High-speed circuit-breakers sorted in traction substations are subject to several requirements regarding their electrical and mechanical parameters as well as their durability and reliability
A proper high-speed circuit-breakers (HSCB) choice has a profound significance for reliability and safety of the electric traction supply system functioning
Being uncritically directed only by test results, without the knowledge of the tests conditions does not provide an opportunity of choosing a proper HSCB
Summary
High-speed circuit-breakers sorted in traction substations are subject to several requirements regarding their electrical and mechanical parameters as well as their durability and reliability. The basic documents relating to high speed circuit-breakers are EN 50123-1 [3] and EN 50123-2 [4] standards for breakers intended for traction substations and sectioning locations (cabins) as well as EN 60077-3 [8] standard, whose provisions need to be read together with EN 60077-1 [6] and EN 60077-2 [7] standards, defining rolling stock breakers’ requirements and tests. Many provisions of these standards are general and permit a large range of parameters. Figures of recorded measurement data were elaborated for the need of this article during tests of HSCB and DC switchgears carried out for Polish or foreign producers
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