A fault location method for electrified railway at traction network

Abstract

The invention discloses a fault location method for an electrified railway AT traction network, which relates to the technical field of electrified railway traction power supply, and can automatically determine the fault type and fault location. A short-circuit fault occurs between the rails R. According to the calculation model of the AT traction network, the optimization goal is to minimize the error between the theoretical value and the actual value of the current distribution on the AT suction; compare the minimum value of the current distribution error under the two short-circuit fault conditions , the fault type corresponding to the smaller value is the fault type of the fault, and the corresponding position is the fault location of the fault. Compared with the AT sucking current, this method can reduce the fault location error caused by the AT sucking current error at both ends of the fault section. The invention has the advantages of simple structure, less investment and convenient implementation, and can be used for both new line construction and old line reconstruction.

Description

technical field [0001] The invention relates to the technical field of electric railway traction power supply. Background technique [0002] High-speed railways generally use AT power supply. The structure of the AT traction network is complex and has no backup, so the probability of failure is high. In order to improve the transportation efficiency of the railway, it is necessary to determine the location and type of the fault as soon as possible. There are many existing fault location algorithms. In full parallel operation, the fault location can be located by using the up-down-down current ratio method or the cross-connection current ratio method. For the separate power supply for uplink and downlink of the double-line AT traction network, V stop maintenance or single-line AT traction network, the uplink and downlink current ratio method or the cross-connection line current ratio method is no longer applicable. At this time, the AT suction current ratio method can be u...

AI Technical Summary

Problems solved by technology

[0003] 1) The current measurement during short circuit is generally not completely synchronized, and the current transformer may also be saturated, resulting in errors in current measurement;

[0004] 2) The existence of AT leakage reactance makes the slope of AT suction current ratio curve smaller, and the positioning accuracy caused by current error is poor;

[0005] 3) The rail and PW (protection wire) are connected once through CPW (connection wire for protection wire) about 1.5km, which makes the distribution of AT suction current more complicated;

[0006] 4) The short-circuit test will bring impact to the relevant equipment of the power system and traction power supply system, so the number of short-circuit tests is generally relatively small, and the short-circuit data that can be used by the AT suction current ratio method is also very limited

[0007] The fault location accuracy of the AT suction current ratio method is poor

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