Research On The Reasonable Grounding And Relay Protection For Entire Cable Power Line Along The Railway

For passenger dedicated line has large freight volume, high effectiveness, and a series of significant advantages of social and economic, the corresponding construction projects has been in full development in china. As the cable line compared with overhead line has obvious advantages such as little influence by external factors, small maintenance,project hidden, and does not affect the environment and personal safety, through the design standard,the entire cable power line is adopted is construction of high-speed railway.Due to power cable to grounding capacitive current is usually dozens of times higher than overhead line, the improving of power cable proportion, significantly increase power supply system on the ground capacitive current, cause the system to a larger single-phase-to-ground current, ground arc can not be self-extinguishing with single-phase ground fault runs, will lead to failure to expand, resulting in overvoltage, the above factors have led to passenger dedicated line cable through capacitive current compensation method, system grounding and protection, are different from the conventional wayIn view of the whole country do not run the entire cable power line mature experience, in order to ensure the power supply system passenger safe and reliable operation of passenger dedicated line cable through the technical problems in further discussion, and to develop a practical solution is very necessary and very urgent.Consider the power line, due to their lesser power load characteristics, so for a long distance, the entire cable power line, not only considering switching away from the transient process, but also consider the operation of capacitive current compensation. This the entire cable power line from the railway through the application of power line purpose of proceeding on the whole cable through the neutral grounding line comparison of the capacitive current compensation in a specific case, different from the cable line running and every link failure detailed study and discussion, for the protection of the railway line through the configuration and Setting provide a valuable reference.