Fault location method and system suitable for sectional power supply mode of high-speed railway

Abstract

The invention discloses a fault location method and system suitable for a sectional power supply mode of a high-speed railway. The fault location system comprises sectional protection devices arrangedat the two sides of a sectional protection section with each station being as a boundary, wherein the sectional protection devices are used for judging fault point distance, fault type and fault direction. The fault location method is characterized in that the sectional protection devices at the two side of the corresponding section line judge the fault type and fault direction; and the sectionalprotection devices at the two sides of the corresponding fault section line calculate fault point distance based on a current value obtained at the tripping time. The position of the fault point is calculated by utilizing the current value of each wire at the wire outgoing end in sectional protection tripping data at the two sides of the fault section, and fault type and fault direction can be determined, thereby realizing fault location for the sectional power supply mode.

Description

technical field [0001] The invention belongs to the technical field of traction power supply for high-speed railways, and in particular relates to a fault location method and system suitable for high-speed railway section power supply mode. Background technique [0002] In recent years, China's railway construction investment has been increasing. The construction of new railway lines is mainly based on the construction of high-speed railway passenger dedicated lines. The power supply system of high-speed railway traction networks generally adopts the full parallel AT power supply mode. This power supply mode has large transmission power and long power supply distance. , low catenary voltage loss, strong anti-interference ability, etc., which greatly improves the transportation capacity of the railway system, and ensuring the reliability of power supply has therefore become more important. The normal power supply of the electrified railway traction network is the premise to en...

AI Technical Summary

Problems solved by technology

At present, the fault location scheme for the segmented power supply mode still uses the original distance measurement scheme under the full parallel AT power supply mode. Taking the power supply arm as the unit, each substation, AT station, and partition station are installed with a fault location device. The distance to the fault point is calculated through the substation. The principle generally adopts the suction current ratio method or the linear reactance ratio method. The suction current ratio method needs to adjust the Q ratio for different lines, while the linear reactance ratio method needs to adjust the unit reactance value, resulting in Not very practical

In addition, the failure of any distance measuring device on the same power supply arm will affect the calculation of the fault distance and the judgment of the fault type, reducing the reliability of the system operation

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