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Method and device for detecting direct current power transmission line fault

A technology for power transmission lines and faults, which is applied in the field of fault detection of DC power transmission lines, and can solve problems such as the accuracy and insufficiency of fault detection that are easily affected by the power consumption of locomotives

Inactive Publication Date: 2015-10-28
STATE GRID CORP OF CHINA +2
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The embodiment of the present invention provides a method and device for detecting DC power transmission line faults, so as to at least solve the problem that the accuracy of the DC feeder fault detection scheme in the existing subway traction power supply system is easily affected by the power consumption of locomotives. Technical issues with insufficient detection accuracy

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  • Method and device for detecting direct current power transmission line fault
  • Method and device for detecting direct current power transmission line fault
  • Method and device for detecting direct current power transmission line fault

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Embodiment 1

[0029] According to an embodiment of the present invention, a detection method for a DC power transmission line fault is provided, such as figure 1 As shown, the method includes:

[0030] S102: Obtain the input current and output current of the section to be detected of the DC power transmission line;

[0031] S104: judging whether the relationship between the input current and the output current satisfies a preset condition;

[0032] S106: If the preset condition is met, it is determined that a fault occurs in the section to be detected.

[0033]It should be clear that one of the technical problems to be solved by the technical solution of the present invention is to provide a detection method so as to accurately detect possible faults on the DC power transmission line, especially faults of the short circuit and leakage type, and The accuracy of this detection will not be affected by the power consumption of the load on the DC power transmission line.

[0034] In order to ...

Embodiment 2

[0071] According to an embodiment of the present invention, there is also provided a DC power transmission line fault detection device for implementing the above detection method, such as Figure 5 As shown, the device includes:

[0072] 1) an acquisition unit 502, configured to acquire the input current and output current of the section to be detected of the DC power transmission line;

[0073] 2) a judging unit 504, configured to judge whether the relationship between the input current and the output current satisfies a preset condition;

[0074] 3) The output unit 506 is configured to determine that a fault occurs in the section to be detected when a preset condition is met.

[0075] It should be clear that one of the technical problems to be solved by the technical solution of the present invention is to provide a detection device so as to accurately detect possible faults on the DC power transmission line, especially faults of the short circuit and leakage type, and The...

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Abstract

The invention discloses a method and device for detecting a direct current power transmission line fault. The method comprises: obtaining an input current and an output current of a to-be-detected segment of a direct current power transmission line; judging whether the relation between the input current and the output current satisfies a preset condition; and if the preset condition is satisfied, determining that the to-be-detected segment breaks down. According to the invention, the technical problem that in the prior art, the accuracy of a detection scheme of a direct current feeder line fault in a subway traction power supply system is easily affected by subway power consumption, so that the accuracy of fault detection is insufficient is overcome. The accuracy of direct current power transmission line fault detection is increased.

Description

technical field [0001] The present invention relates to the field of electric power safety, in particular to a method and device for detecting a DC power transmission line fault. Background technique [0002] In the field of power safety, in order to ensure the reliable operation of the DC traction power supply system of the subway, under the normal power consumption environment of the locomotive, it is usually necessary to accurately judge the faults that may occur at various positions of the power transmission line, and then in the fault On the basis of judgment, choose whether to cut off the power supply of the faulty section. The most frequent types of faults are short-circuit faults and leakage faults of power supply circuits. For this type of faults, protection schemes based on monitoring the current on power transmission lines are usually adopted. [0003] Specifically, there are two commonly used protection methods at present: 1) large current tripping protection; 2...

Claims

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Application Information

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IPC IPC(8): G01R31/08
CPCY04S10/52
Inventor 吕立平谷君袁清芳竺懋渝周作春张学哲和敬涵王小君孙月嘉宋晓明李长城
Owner STATE GRID CORP OF CHINA
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