A method and system for determining the fault interval of a transmission line
A technology for transmission lines and fault intervals, which is applied to fault locations, fault detection according to conductor types, and electrical measurement, etc., can solve problems such as difficulty and increase the difficulty of fault location, and achieve the effect of reducing the difficulty of determination.
Active Publication Date: 2018-11-09
SICHUAN ZHONGGUANG LIGHTNING PROTECTION TECH
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Problems solved by technology
However, in the prior art, it is more difficult to determine the fault interval, which increases the difficulty of the entire process of fault location
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[0036] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present invention.
[0037] The embodiment of the invention discloses a method for determining a transmission line fault interval, see figure 1 As shown, the method includes:
[0038] Step S11: Use N current traveling wave detection devices pre-installed on the transmission line to sample the fault traveling wave signal generated at the fault point on the transmission line to obtain N groups of fault traveling wave signals, where N is an integer not less than ...
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The present invention discloses a power transmission line fault section determining method and a power transmission line fault section determining system. The method includes the following steps that: N current traveling wave detection devices arranged a power transmission line in advance are utilized to carry out signal sampling on fault traveling wave signals generated by a fault point on the power transmission line so as to obtain N groups of fault traveling wave signals, wherein N is an integer not smaller than 2; wavelet singular value detection is carried out on the N groups of fault traveling wave signals through a preset wavelet function, so that N groups of wavelet coefficient sequences can be obtained, the polarity of wavelet coefficients of the wavelet coefficient sequences being consistent with the head wave polarity of fault traveling waves; the head wave polarity of fault traveling waves obtained by each current traveling wave detection device is analyzed according to the polarity of the wavelet coefficients in the N groups of wavelet coefficient sequences, and N groups of head wave polarities can be obtained correspondingly; and the fault section of the power transmission line is determined by using the above N groups of head wave polarities. With the power transmission line fault section determining method and the power transmission line fault section determining system provided by the technical schemes of the invention adopted, the difficulty of determining a fault section can be decreased.
Description
Technical field [0001] The present invention relates to the technical field of line fault distance measurement, and in particular to a method and system for determining a transmission line fault interval. Background technique [0002] Currently, fault location methods on transmission lines include traveling wave method and impedance method. Among them, the impedance method is affected by factors such as excessive resistance and line structure, and its ranging accuracy is not ideal. The traveling wave method uses the propagation time difference of the fault traveling wave signal to locate the fault point. This method has high calculation accuracy and good adaptability, and has been widely used. [0003] In the process of fault location using the traveling wave method, it is necessary to determine the fault interval first, and then combine the specific location of the detection device and the first wave time difference received by the detection device to finally obtain the specific ...
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IPC IPC(8): G01R31/08
CPCG01R31/085G01R31/088
Inventor 李杰赖军龚玲孙铭江杨国华
Owner SICHUAN ZHONGGUANG LIGHTNING PROTECTION TECH