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Lightning stroke fault identification method and system

A technology of lightning strike fault and identification method, which is applied to fault location and detection of faults by conductor type, etc., can solve the problems of lightning strike fault type identification, inability to effectively distinguish lightning strike and ordinary short-circuit fault, etc., to improve utilization and sparse decomposition results. , express the effect of concise

Inactive Publication Date: 2017-02-22
QINZHOU POWER SUPPLY BUREAU OF GUANGXI POWER GRID CO LTD
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  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Based on this, it is necessary to provide a lightning fault identification method and system for the traditional technology that cannot accurately identify the type of lightning fault and cannot effectively distinguish between lightning and ordinary short-circuit faults.

Method used

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  • Lightning stroke fault identification method and system
  • Lightning stroke fault identification method and system
  • Lightning stroke fault identification method and system

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Embodiment 1

[0027] In order to solve the problem that the traditional technology cannot accurately distinguish the fault type of lightning strike fault, and cannot effectively distinguish between lightning strike and common short-circuit fault, the present invention provides Embodiment 1 of a lightning strike fault identification method; figure 1 It is a schematic flow chart of Embodiment 1 of the lightning fault identification method of the present invention; as figure 1 As shown, the following steps may be included:

[0028] Step S110: Read the effective fault waveform information in the local database, perform wavelet transform multi-resolution analysis and processing on the effective fault waveform information, and obtain the fault waveform; the effective fault waveform information is newly added information collected in real time when the transmission line fails Obtained after fault information is preprocessed; preprocessing includes removing redundant information;

[0029] Step S12...

Embodiment 2

[0058] Aiming at the current distribution line traveling wave ranging device lacks an effective algorithm for effectively distinguishing between lightning strikes and common short-circuit faults, and thus cannot effectively distinguish between lightning and short-circuit faults. The present invention also provides Embodiment 2 of a lightning fault identification method; figure 2 It is a schematic flow chart of Embodiment 2 of the lightning fault identification method of the present invention; as figure 2 As shown, it mainly includes the fault information processing stage and the fault type identification stage.

[0059] The steps in the fault information processing stage include:

[0060] Step 1: Monitor the information on the FTU in real time. When the transmission line fails, collect the voltage and current waveform signals from the FTU before and after the fault, and store them in the local database;

[0061] Step 2: Use the FA algorithm to preprocess the newly added fa...

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Abstract

The invention relates to a lightning stroke fault identification method and system. The lightning stroke fault identification method comprises the following steps of reading valid fault waveform information in a local database, performing wavelet transform multi-resolution analysis on the valid fault waveform information, and obtaining a fault waveform; analyzing the frequency of the fault waveform to obtain a ratio of the wavelet energy of the transient current additional component of the fault waveform at a preset high-frequency band to the wavelet energy of the transient current additional component of the fault waveform on a preset low-frequency band; according to the ratio of the wavelet energy, identifying whether the line fault type of a transmission line is non-fault lightning stroke to obtain an identification result; if the identification result is indicative of no, obtaining the energy distribution characteristic data of the fault waveform; according to the energy distribution characteristic data, identifying the line fault type of the transmission line is fault lightning stroke or ordinary short-circuit fault. The method and system can improve the utilization rate of fault information and the accuracy rate of identification, and increase the identification rate of lightning fault type.

Description

technical field [0001] The invention relates to the technical field of transmission line fault identification, in particular to a lightning strike fault identification method and system. Background technique [0002] Lightning strikes are a serious threat to both transmission lines and distribution networks. Lightning strikes are one of the main reasons that affect the accuracy of traveling wave ranging devices. The identification of lightning strike faults is the basis for solving lightning strike interference on transmission lines. Therefore, for line engineering personnel and operators, it is important to determine the number and location of lightning strikes on transmission lines It has important theoretical value and engineering significance to identify faulty lightning strike, non-faulty lightning strike and ordinary short-circuit fault. [0003] At present, the relay protection of transmission lines relies on the transient protection of fault traveling wave high-freq...

Claims

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Application Information

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IPC IPC(8): G01R31/08
CPCG01R31/085
Inventor 邹宇麦海波唐泽渊苏一峰汪明梁源谢振俊宋殷冠周民施志强
Owner QINZHOU POWER SUPPLY BUREAU OF GUANGXI POWER GRID CO LTD
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