A Traveling Wave Ranging Method Adapted to Dense Lightning Falls on Transmission Lines
A traveling wave ranging and transmission line technology, which is applied in the direction of measuring electricity, measuring devices, measuring electrical variables, etc. The effect of improved reliability and ranging accuracy
Active Publication Date: 2019-06-21
CHINA SOUTHERN POWER GRID COMPANY +1
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Problems solved by technology
[0004] The purpose of the present invention is to overcome the problem in the prior art that the reliability and accuracy requirements of traveling wave distance measurement cannot be achieved for the operating conditions of intensive lightning strikes on transmission lines
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[0031] The present invention will be further described below in conjunction with the accompanying drawings.
[0032] The traveling wave distance measuring method adapted to dense lightning strikes on power transmission lines of the present invention is applied to the integrated traveling wave ranging device for line protection. The integrated traveling wave ranging device for line protection here is a prior art, and the installation schematic diagram is as follows figure 1 Shown; system block diagram, such as figure 2 Shown, it comprises programmable gate array FPGA, dynamic random access memory DDR, DSP processor, CPU and nonvolatile memory card, method of the present invention, as image 3 shown, including the following steps,
[0033] Step (A), according to the characteristics of the three-phase current traveling wave signal of the lightning strike transmission line, identifying the three-phase current traveling wave as a lightning strike traveling wave or a fault traveli...
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The invention discloses a traveling wave distance measurement method adapt to power transmission line intensive thunderbolts. The traveling wave distance measurement method is suitable for line protection traveling wave distance measurement integrated device, and comprises the steps of: identifying lightning traveling waves by utilizing the characteristic that amplitude of three phases of lightning traveling waves are approximate; setting a sensitive traveling wave starting criterion to prevent refused action of traveling waves, regarding a starting or action signal of relay protection as a confirmation criterion for traveling wave starting to prevent mistaken starting of the traveling waves, and realizing one-to-one correspondence between protection starting or protection actions and traveling wave starting; adopting a large-scale FPGA and a large-capacity DDR to realize no-dead-zone recording of fault travelling waves through the cooperation of a two-level caching technology; and selecting a line-mode traveling wave signal to perform traveling wave distance measurement according to signal amplitude, so as to eliminate interference of lightning waves on traveling wave distance measurement. By adopting the traveling wave distance measurement method, the traveling wave distance measurement reliability and distance measurement precision of the line protection traveling wave distance measurement integrated device under the operating condition of intensive thunderbolts can be improved, and the traveling wave distance measurement method has good application prospect.
Description
technical field [0001] The invention relates to the technical field of power grid protection, in particular to a traveling wave ranging method adapted to dense lightning strikes on transmission lines. Background technique [0002] At present, the fault analysis method of transmission line relay protection devices is easily affected by the operation mode of the power grid system, transition resistance, attenuated DC component and measurement error, and it is difficult to achieve accurate fault location; the theoretical accuracy of the traveling wave ranging method is high, but the engineering There are also some adaptability problems in the application. Moreover, when the transmission line is struck by lightning, the general traveling wave distance measuring device is easily disturbed and misstarted, forming unnecessary waveform and time records; A large amount of useless information formed by the frequent start-up of the distance measuring device may cover the useful fault r...
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IPC IPC(8): G01R31/08G01R31/02
CPCG01R31/081G01R31/088G01R31/58
Inventor 丁晓兵史泽兵陈玉林刘千宽余江赵玉灿黄佳胤徐晓春赵青春朱晓彤
Owner CHINA SOUTHERN POWER GRID COMPANY