Method and device for locating fault points of distribution network lines based on double sampling rate

A line fault, double sampling rate technology, applied in fault location, measurement device, detection of faults by conductor type, etc., can solve problems such as the inability to provide localized information in the time domain and frequency domain of the signal, and the inability to meet the analysis of non-stationary signals. , to achieve the effect of reducing the sampling time window, large attenuation distortion, and cost reduction

Active Publication Date: 2021-02-19
ELECTRIC POWER RESEARCH INSTITUTE OF STATE GRID SHANDONG ELECTRIC POWER COMPANY +1
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Problems solved by technology

At present, in the field of engineering applications, the fast Fourier transform method is generally used for signal spectrum analysis. This method is the most widely used and the technology is relatively mature. However, the fast Fourier transform method cannot meet the analysis of non-stationary signals. There are unavoidable defects in the analysis of non-stationary processes, so the fast Fourier transform can only give statistical average results in the time domain or frequency domain, but cannot provide information on the localization of the time domain and frequency domain of the signal

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  • Method and device for locating fault points of distribution network lines based on double sampling rate
  • Method and device for locating fault points of distribution network lines based on double sampling rate
  • Method and device for locating fault points of distribution network lines based on double sampling rate

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[0050] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention more clear, the following will clearly and completely describe the technical solutions of the embodiments of the present invention in conjunction with the drawings of the embodiments of the present invention. Apparently, the described embodiments are some, not all, embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the described embodiments of the present invention belong to the protection scope of the present invention.

[0051] When a fault occurs on a power line, a transient traveling wave process will appear on the line due to a sudden change in voltage at the fault point. The traveling wave phenomenon on the power line can be described by the telegraph equation based on the distributed parameter line model. Both the voltage and current along the line contain two traveling wave components, forward and rev...

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Abstract

The invention discloses a positioning method and a device for distribution network line fault points based on a double sampling rate. Phase correlation calculation is carried out on phase current waveforms acquired by a low sampling rate measuring apparatus. A recording function of a high sampling rate measuring apparatus is started when a fault occurs. Phase current waveforms acquired by the highsampling rate measuring apparatus are processed by a short-time Fourier transform. Accurate positioning is carried out on the fault points according to a D-type traveling wave method. According to the positioning method and the device for the distribution network line fault points based on the double sampling rate, the correlation coefficient calculation is carried out on waveform data, so as tosolve the unreliable problem of the traditional amplitude triggering recording wave; correlation calculation is only carried out on low sampling rate data, so as to reduce the calculation amount and improve the fault recording triggering speed; and meanwhile, a sampling time window of the high sampling rate measuring apparatus is small, so as to not rely on the large storage capacity and reduce the cost of distribution network detection equipment.

Description

technical field [0001] The invention relates to a method for diagnosing faults of distribution network lines, and more specifically, to a method and device for accurately locating fault points of distribution network lines with a double sampling rate based on short-time Fourier transform. Background technique [0002] With the continuous development of the economy, users have increasingly higher requirements on the quality of power supply. As the part of the power grid that directly interacts with users, the distribution network has a major impact on the user's power consumption experience, and the fault location of the distribution network is particularly important. At present, the domestic distribution network mostly adopts the neutral point non-effective grounding method, the topology structure is complex, and there are many branches; the ground fault current is small, and the fault location is difficult. With the improvement of people's requirements for distribution net...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/08
CPCG01R31/086G01R31/088Y04S10/52
Inventor 左新斌张世栋邵志敏房牧刘合金张林利刘明林孟海磊任杰李立生孙勇赵辰宇李建修苏国强
Owner ELECTRIC POWER RESEARCH INSTITUTE OF STATE GRID SHANDONG ELECTRIC POWER COMPANY
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