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Method for positioning failure section of high-speed railway through line

A technology for fault sections and high-speed railways, applied to fault locations, measuring devices, instruments, etc., can solve the problems of large short-circuit transition resistance, low fault location accuracy, and many power supply points, so as to achieve low cost and save faults Find the effect of time

Inactive Publication Date: 2019-11-22
SOUTHWEST JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is one box-type transformer every 2-3km in the high-speed rail section, and there are often more than 20 box-type transformers in a through-line power supply section, and there are many power supply points
In addition, because the cables of the high-speed railway through-line are all laid in the integrated cable duct, the short-circuit transition resistance value is relatively large, and the fault location accuracy is not high

Method used

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  • Method for positioning failure section of high-speed railway through line
  • Method for positioning failure section of high-speed railway through line
  • Method for positioning failure section of high-speed railway through line

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Step 1: Calculate the impedance sequence under normal operating conditions

[0027] The total length of the through line is 48km, and a box-type substation is set up every 3km. Measurement points are set at the box-type substation along the power distribution station to collect real-time three-phase voltage and current values ​​flowing through them, and calculate the three-phase " Virtual Impedance". For the convenience of description, only the "virtual impedance value" at every 6km is listed below, which does not affect the description of the embodiment.

[0028] During normal operation, due to the effect of current shunting, the farther away from the power supply, the smaller the current value of each phase; at the same time, due to the large capacitive current determined by the cable parameters, the farther away from the power supply, the voltage will gradually rise. To sum up, its "virtual impedance" sequence value has an obvious increasing trend. Table 1 calculat...

Embodiment 2

[0042] Step 1: Calculate the impedance sequence under normal operating conditions

[0043]This step is the same as that in Embodiment 1 and will not be repeated here.

[0044] Step 2: Calculate the impedance sequence under fault conditions

[0045] It is assumed that a two-phase short-circuit fault occurs at a distance L of 30km from the power distribution station. Calculate the "virtual impedance" of each phase voltage and current value from each measurement point. When L=30km, under the condition of AB two-phase short-circuit fault, each measurement point and each phase calculate the sequence value data of "virtual impedance" as shown in Table 3.

[0046] Table 3 Calculated impedance of each measurement point under the condition of AB fault at L=30km

[0047]

[0048] Compare the original impedance sequence value with the updated impedance sequence value after the fault, according to figure 2 The flow chart of the location of the fault section of the high-speed railw...

Embodiment 3

[0055] Step 1: Calculate the impedance sequence under normal operating conditions

[0056] This step is the same as that in Embodiment 1 and will not be repeated here.

[0057] Step 2: Calculate the impedance sequence under fault conditions

[0058] It is assumed that a three-phase short-circuit fault occurs at a distance L of 30km from the power distribution station. Calculate the "virtual impedance" of each phase voltage and current value from each measurement point. When L=30km, the sequence value data of "virtual impedance" calculated for each phase of each measurement point under the condition of three-phase short-circuit fault is shown in Table 4.

[0059] Table 4 Calculated impedance of each measurement point under the condition of ABC fault at L=30km

[0060]

[0061] Compare the original impedance sequence value with the updated impedance sequence value after the fault, according to figure 2 The flow chart of the location of the fault section of the high-speed...

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Abstract

The invention discloses a method for positioning a failure section of a high-speed railway through line, and relates to the technical field of power transmission line fault diagnosis. According to electric quantity information collected by a remote terminal unit device in each box-type transformer substation along the high-speed railway through line, the ratio of the measurement voltage to the measurement current of each measurement point of the adjacent distribution substations and the box-type transformer substations along the line is calculated, an impedance sequence is generated, the impedance sequence is updated in real time after the high-speed railway line fails, and the change of the impedance sequence before and after the failure is analyzed to judge between which two adjacent box-type substations the failure occurs specifically, so that the purpose of positioning the failure section of the high-speed railway through line is achieved.

Description

technical field [0001] The invention relates to the technical field of fault diagnosis of power transmission lines. Background technique [0002] Impedance method (distance protection) is one of the protection methods of railway traction network, which has not been used in railway power distribution system. On the railway through-line, due to the difficulty of determining the transition resistance during the ground fault and being greatly affected by the operating conditions, the distance setting value is difficult to determine, or there is a large error. [0003] At present, the commonly used impedance method is used to calculate and analyze the fault data collected by the microcomputer protection device of the 10kV power distribution station after the fault occurs, so as to realize the fault location. However, there is one box-type transformer every 2-3km in the high-speed rail section, and there are often more than 20 box-type transformers in a through-line power supply ...

Claims

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Application Information

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IPC IPC(8): G01R31/08
CPCG01R31/088
Inventor 韩鹏程何晓琼朱明轩余昊伦舒泽亮
Owner SOUTHWEST JIAOTONG UNIV
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