Abstract
ABSTRACT The article considers features of a scheme of protection of sections of a power network with disconnectors at a sectioning post (SP), its advantages and disadvantages are shown. A solution is proposed that allows improving the scheme under study and enhancing reliability of a traction power supply system. The power circuit of a two-track section of the catenary with disconnectors and a switch at SP, schedules of selectivity of protection of switches of adjacent traction substations and switch of SP, and also their time characteristics are shown. The sequence of actions connected with supplying current to the disconnected section of the network under the proposed protection scheme is considered. Keywords: railways, power network, catenary, sectioning post with disconnectors, traction power supply, short circuit, non-selective protection system, cross-link protection system, time delay.
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