Fault calibration algorithm for direct supply traction network of electrified railway

A technology for electrified railways and traction networks, which is applied to fault locations, fault detection according to conductor type, and electrical measurement to achieve the effects of good versatility, high accuracy, and easy implementation.

Active Publication Date: 2018-11-23
SOUTHWEST JIAOTONG UNIV
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Problems solved by technology

[0005] The purpose of the present invention is to provide a fault calibration algorithm for the direct supply traction network of electrified railways, which can effectively eliminate the influence of factors such as the direct supply traction network structure, operation mode, and transition resistance, and accurately solve the problem of short circuit faults in the direct supply traction network. positioning technical issues

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  • Fault calibration algorithm for direct supply traction network of electrified railway
  • Fault calibration algorithm for direct supply traction network of electrified railway
  • Fault calibration algorithm for direct supply traction network of electrified railway

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Embodiment Construction

[0022] Such as figure 1 As shown, suppose the segment length of electrified railway direct-supply traction network is D, the head and the end of the uplink and downlink T lines are not connected in parallel, and the self-impedance of the uplink contact line T1 and the downlink contact line T2 is Z T , the self-impedance of rail R is Z R , the mutual impedance between the uplink contact line T1 and the downlink contact line T2 is Z TT ;Synchronously measure the voltage phasor and current phasor at both ends of the direct supply traction network segment, including the voltage phasor at the head end of the uplink contact line T1 and head current phasor terminal voltage phasor and terminal current phasor Voltage phasor at the head end of downlink contact line T2 and head current phasor terminal voltage phasor and terminal current phasor Assuming that a TR short circuit occurs at a distance of x (distance from the end of the direct supply traction network segment D-...

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Abstract

The invention discloses a fault calibration algorithm for a direct supply traction network of an electrified railway, and relates to the technical field of electrified railway traction power supply. The algorithm comprises the steps: measuring a voltage phasor and a current phasor of two ends of each segment of the direct supply traction network synchronously; listing circuit equations through a head-end voltage phasor, a head-end current phasor, a tail-end voltage phasor and a tail-end current phasor of an uplink contact line T1 and a head-end voltage phasor, a head-end current phasor, a tail-end voltage phasor and a tail-end current phasor of a downlink contact line T2, wherein the above phasors are shown in the description; and solving a fault position x or D-x. The algorithm can eliminate the impact from the structure and operation mode of a traction network, and is suitable for a non-metal short circuit fault condition of a bigger transition resistor, and is high in fault locatingprecision. The algorithm is widely suitable for the fault locating of the direct supply traction power supply system of the electrified railway.

Description

technical field [0001] The invention relates to the technical field of electric railway traction power supply. Background technique [0002] my country's railway construction has attracted worldwide attention and achieved remarkable results. As of 2017, the operating mileage of my country's railways has reached 127,000 km, of which the operating mileage of high-speed railways has increased to 25,000 km. High-speed railways generally use AT (Auto Transformer, autotransformer) power supply mode, but a large number of normal-speed railways and freight lines still use DT (direct power supply) mode, and the safety and good operation of traction power supply systems must be highly valued. [0003] The traction net has no backup and is exposed to nature, coupled with high-speed pantograph-catenary contact, it is easy to cause failures, cause power outages, and affect normal operation. The traction network of electrified railways has a complex structure, no backup, and it is diffi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/08G01R31/02
CPCG01R31/086G01R31/088G01R31/50
Inventor 易东李群湛马庆安杨乃琪陈民武赵艺解绍锋张丽艳
Owner SOUTHWEST JIAOTONG UNIV
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