A Lightning Strike Locating Method for Incoming Lines of Substations
A positioning method and substation technology, which is applied in the field of power transmission and transformation, can solve the problems that the lightning protection effect of the incoming line section of the substation cannot be satisfied, and the lightning strike position of the incoming line section of the overhead line cannot be accurately judged, and the effect of high accuracy is achieved.
Active Publication Date: 2017-07-21
STATE GRID CORP OF CHINA +1
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Problems solved by technology
The lightning location method currently used has a positioning accuracy of about 500m, which cannot accurately determine the lightning strike location of the incoming section of the overhead line, and cannot meet the requirements for evaluating the lightning protection effect of the incoming section of the substation.
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Embodiment Construction
[0024] figure 1 It is the implementation flowchart of the lightning strike positioning method for the substation incoming line section of the present invention, according to figure 1 , a method for locating a lightning strike in a substation incoming line section includes:
[0025] 1) Establish the electromagnetic transient simulation model of the substation and overhead lines, including the overvoltage calculation model when the conductor is shielded ( figure 2 shown) and the overvoltage calculation model when directly hitting the tower ( image 3 shown);
[0026] 2) Calculate the overvoltage u( Figure 4 shown);
[0027] 3) Substitute the calculated overvoltage amplitude u into the volt-ampere characteristic curve of the arrester (C is a constant, α is the non-linear coefficient of the arrester), and the arrester discharge current i ( Figure 5 As shown), establish the corresponding relationship between different lightning strike points and lightning current amplitud...
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Disclosed is a substation line inlet segment lightning stroke positioning method. The method comprises the steps of firstly, by establishing an electromagnetic transient simulation model of a substation and a line inlet segment overhead line, calculating amplitudes of overvoltage conducted to a substation line interval arrester when a lightning current strikes leads or towers at different positions and discharge currents of the arrester, and establishing the correspondence of different lightning stricken points and amplitudes of the lightning current with the discharge currents of the arrester; then adopting a Rogowski Coil for acquiring the leakage current of the substation line interval arrester in real time; and when high-frequency transient component exists in a leakage current signal, extracting the high-frequency transient component, obtaining the generated discharge current when the overvoltage acts on the arrester, fitting with the correspondence between the amplitudes of the lightning current at the different lightning stricken points and the discharge currents of the arrester, and deducing lightning stricken parts and the amplitudes of the lightning current. The method in the invention can not only accurately position the lightning stricken parts of the substation line inlet segment overhead line, but can also obtain the amplitudes of the lightning current with high accuracy.
Description
technical field [0001] The invention relates to a method for locating a lightning strike on an incoming line section of a substation, and belongs to the technical field of power transmission and transformation. Background technique [0002] The lightning strike of the incoming line section of the substation is one of the important factors leading to equipment failure in the substation. Accurately locating the lightning strike point and lightning current is of great significance for evaluating the lightning protection effect of the incoming line section of the substation. The lightning location method currently used has a positioning accuracy of about 500m, which cannot accurately determine the lightning strike location of the incoming section of the overhead line, and cannot meet the requirements for evaluating the lightning protection effect of the incoming section of the substation. Contents of the invention [0003] The purpose of the present invention is to overcome th...
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IPC IPC(8): G01R31/08
Inventor 晏年平万华陈丽勤张竞
Owner STATE GRID CORP OF CHINA