Fault location method and system for cable hybrid transmission line
A technology for hybrid lines and transmission lines, applied to fault locations, detecting faults according to conductor types, measuring electricity, etc., can solve problems that have not been verified, and achieve the effects of simplifying calculations, reducing measurement data, and improving accuracy and reliability
Inactive Publication Date: 2017-04-19
SHENZHEN POWER SUPPLY BUREAU +1
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Problems solved by technology
Although the double-terminal traveling wave distance measurement using the wave velocity normalization method is the most ideal for cable overhead line hybrid transmission lines, it is only used in small current transmission lines and has not been verified in high-voltage transmission hybrid lines. , which needs to be realized in future research work
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[0046] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings.
[0047] Such as figure 1 As shown, in the embodiment of the present invention, a method for fault location of a cable hybrid transmission line is provided, which is used in a three-section cable hybrid line (such as figure 2 As shown), the cable hybrid line is formed by the first overhead line, the second overhead line and the cable line arranged between the first overhead line and the second overhead line, and the first overhead line is also connected with the first busbar (not shown), the second overhead line is also connected to the second bus (not shown), the method includes:
[0048] Step S1, according to the corresponding lengths of the first overhead line, the second overhead line and the cables respectively and the propagation speeds of the fault travelin...
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The invention provides a fault location method for a cable hybrid transmission line. The method comprises the steps of acquiring the corresponding propagation time of a faulty traveling wave on a first overhead line, a second overhead line and a cable line respectively; presetting a plurality of faulty traveling wave starting points, and calculating the time difference of the faulty traveling wave traveling from each faulty traveling wave starting point to a first bus and to a second bus according to the propagation time of the faulty traveling wave on each line; acquiring the time difference of the faulty traveling wave between the faulty traveling wave actually reaches the first bus and actually reaches the second bus; according to the time difference of the faulty traveling wave between the faulty traveling wave actually reaches the first bus and actually reaches the second bus, determining the fault location of the actual location of the faulty traveling wave among all time differences of the faulty traveling wave traveling from all faulty traveling wave starting points to the first bus and the corresponding second bus; and calculating the distance between the fault location and the first bus and / or the second bus. According to the technical scheme of the invention, the method can be applied to a complex power transmission line with multiple alternately occurred cable overhead lines. Location results are simply and reliably obtained.
Description
technical field [0001] The invention relates to the technical field of cable hybrid transmission line fault location, in particular to a method and system for fault distance measurement of cable hybrid transmission line. Background technique [0002] With the rapid development of my country's economy, the power load of cities and towns is increasing. The traditional overhead lines can no longer meet the needs of my country's cities and towns. The main reasons are: On the one hand, the construction of overhead lines will take up a lot of Land resources are not conducive to the rational use of land resources. On the other hand, criss-cross overhead lines occupy urban construction space, which is not conducive to modern urbanization. Power cables have been widely used in power grids because of their safety and reliability, and are conducive to urban modernization. Power lines have also developed from simple overhead lines in the past to overhead line-cable hybrid transmission li...
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Login to View More IPC IPC(8): G01R31/08
CPCG01R31/085G01R31/088
Inventor 张宏钊李勋黄荣辉刘顺桂姚森敬陈平安韵竹邵健刘辉
Owner SHENZHEN POWER SUPPLY BUREAU