High-tension transmission line single-ended traveling wave fault distance detection method combined with time-frequency characteristics

A technology for high-voltage transmission lines and traveling wave faults, applied in fault locations, information technology support systems, etc., can solve problems such as parameter selection uncertainty, ranging accuracy dependent, frequency aliasing, etc., to avoid difficult extraction of frequencies.

Inactive Publication Date: 2013-09-04
SOUTHEAST UNIV
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Problems solved by technology

However, the ranging accuracy of the traveling wave natural frequency method depends on the accuracy of the frequency principal components, and the Fourier transform, the complex wavelet transform of the time-frequency transform, and the multi-signal classification algorithm currently used have frequency aliasing, false frequency, parameter Choose an unsure question

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  • High-tension transmission line single-ended traveling wave fault distance detection method combined with time-frequency characteristics
  • High-tension transmission line single-ended traveling wave fault distance detection method combined with time-frequency characteristics
  • High-tension transmission line single-ended traveling wave fault distance detection method combined with time-frequency characteristics

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Embodiment Construction

[0022] specific implementation plan

[0023] Phase transformation

[0024] Perform phase-mode transformation on the fault traveling wave received by the measuring device, and select the α-mode component in the line-mode component for analysis and calculation (filter out the 50Hz power frequency component).

[0025] Determination of q' or q" time and traveling wave natural frequency f' or f" using cepstrum analysis

[0026] cepstrum analysis Also known as power cepstrum, it is defined as logarithmically weighting the bilateral power spectrum of the signal, and then performing a Fourier transform on the signal. The q in the above definition is called the reciprocal frequency, and q has the connotation of time. In fact, it is the same as the q in the autocorrelation function, and it is generally measured in milliseconds. The cepstrum is useful for interpreting time signals in terms of frequency components, since a high ceprate indicates rapidly fluctuating components in the s...

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Abstract

The invention discloses a high-tension transmission line single-ended traveling wave fault distance detection method combined with time-frequency characteristics. According to the method, time of reciprocating propagation between an end point and a fault point and inherent frequency corresponding to the time are fully used, wherein the end point and the fault point are simultaneously obtained in a cepstrum analysis. The advantages of a traveling wave method and the advantages of a traveling wave inherent-frequency distance detection method are centralized, and therefore the problems that in single-ended traveling wave fault location, wave velocity is difficult to calculate, propagation time of a small phase angle is difficult to seek, due to the fact that only the traveling wave inherent-frequency distance method is used, the frequency is not easy to extract, and in the calculation, an initial phase angle of a bus end reflection and an initial phase angle of fault point reflection need to be considered are solved. Meanwhile, due to the fact that other interference signals are irrelevant with traveling wave signals, the high-tension transmission line single-ended traveling wave fault distance detection method combined with the time-frequency characteristics has the advantages of being high in anti-interference capacity, easy to operate, high in distance detection accuracy and very suitable for distance detection on site.

Description

technical field [0001] The invention relates to a single-end ranging method applied to traveling wave faults of high-voltage transmission lines, and belongs to the technical field of grid operation fault diagnosis. Background technique [0002] Transmission lines are the most fault-prone components of the power system. Accurate fault location can save a lot of manpower, material and financial resources spent on line hunting, speed up power supply recovery, reduce economic losses, and improve operational reliability. Accurately and quickly determining the fault location is an important measure to improve the safe operation of the power grid, and is of great significance to the safe and reliable operation of the power system. [0003] When a transmission line fails, the traveling wave generated at the fault point propagates along the line to both ends of the line, and the propagation speed of the fault traveling wave is close to the speed of light c. Due to the discontinuity ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/08
CPCY04S10/52
Inventor 卢毅
Owner SOUTHEAST UNIV
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