Overhead contact line short circuit protection system and method of through type cophase power supply system

Abstract

The invention relates to an overhead contact line short circuit protection system and method of a through type cophase power supply system. Multiple parallel-connected circuit breakers are arranged atexits of two adjacent traction substations; a current transformer is configured on each circuit breaker; a voltage transformer and the current transformer which are connected with each other in series are arranged on a main track power supply feeder line side; and an optical fiber communication channel is arranged between the two adjacent traction substations. According to the overhead contact line short circuit protection system and method of the through type cophase power supply system, by collecting signals of the current transformer and the voltage transformer of each feeder line of the adjacent traction substations, related electrical parameters are transmitted to the through type cophase power supply system to be comprehensively analyzed and judged; trip commands are transmitted tocorresponding feeder line circuit breakers; and therefore, pilot distant protection, pilot current protection, low voltage starting optical fiber longitudinal differential protection and high drag grounding protection functions are realized; and the purpose of protecting an overhead contact line of the through type cophase power supply system is achieved. According to the overhead contact line short circuit protection system and method of the through type cophase power supply system, the problem that traditional relay protection cannot protect the full length of the overhead contact line whenthe overhead contact line of the through type cophase power supply system generates large current grounding and high drag grounding is solved.

Description

Technical field [0001] The invention belongs to the technical field of railway electricity, and specifically relates to a contact network short-circuit protection system and a method of a through-type in-phase power supply system. Background technique [0002] After electrified railway adopts through-type in-phase power supply, the network structure has changed compared with the traditional unilateral power supply mode. When the catenary is short-circuited, the feeder current direction of the traction substation may be different. The traditional conventional relay protection cannot meet the protection of the full-length catenary. need. Summary of the invention [0003] The purpose of the present invention is to provide a catenary short-circuit protection system and method for a through-type in-phase power supply system, which solves the problem that the traditional conventional relay protection cannot protect when the catenary of the through-type in-phase power supply network syst...

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Problems solved by technology

[0003] The purpose of the present invention is to provide a catenary short-circuit protection system and method for a through-type in-phase power supply system, which solves the problem that traditional conventional relay protection cannot protect when the catenary of the through-type in-phase power supply system is grounded with a large current and high resistance. catenary length problem

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