A short-circuit and overload screening method at the end of traction power supply arm of high-speed railway

Abstract

A short-circuit and overload screening method at the end of a high-speed railway traction power supply arm, based on the application of relay protection equipment and feeder protection equipment in existing electrified railway traction substations, including a data collection module, a data processing module, a data feedback module and a storage module . In the present invention, each module adopts a unified network interface, based on the IEC61850 protocol, and exchanges data with the relay protection devices of each station on the power supply arm through a dedicated network channel to realize communication and interconnection. The present invention adopts real-time data processing technology, and for the power supply mode with high traffic density, long power supply arm and cross-area power supply, real-time monitoring of the load operation status is carried out, and the traditional overload protection and over-current protection are self-adapted Permanent upgrades and improvements to ensure the safety of lines and equipment under such operating conditions, reduce the number of trips, and provide strong technical support for the normal operation of electrified railways.

Description

technical field [0001] The invention belongs to the technical field of traction power supply for electrified railways, in particular to a method for discriminating short circuit and overload at the end of a traction power supply arm of a high-speed railway. Background technique [0002] The traction substation of electrified railway is an important node in the operation of electrified railway. The catenary of the traction substation is the core equipment for supplying power to electric locomotives. Excessive phase and high resistance grounding, etc. With the development of electrified high-speed railway, high-speed railway traffic density increases, locomotive traction load changes and other problems lead to increasingly tight power supply line capacity, overload tripping problem has become increasingly prominent. At present, in the prior art, the measure taken by the general traction substation is to put in inverse-time overload protection. The current heats up, thereby e...

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Problems solved by technology

[0004] In order to overcome the shortcomings of the existing electrified railway traction substations, which cannot distinguish between cross-regional power supply, terminal short-circuit current and overload current when the traffic density is high, the present invention provides the use of existing mature communication technology, through different power supply arm substations. The data interaction between substations completes the identification of locomotive load and short circuit conditions, and then adjusts the overload protection function of traction substations. In the application, the traction power supply system is taken as a whole, and the traction substations, AT substations, and partitions in the same power supply arm The coordination calculation is carried out, and the data information exchange with the traction substation of the adjacent power supply arm is carried out at the same time

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