Distance measurement method for transmission line fault based on TT transform and wave velocity optimization

A transmission line, fault location technology, applied in the fault location, detection of faults according to conductor type, measurement of electricity and other directions, can solve the problem of unable to achieve self-adaptive adjustment, affecting the accuracy of fault location of transmission lines, etc. ability, powerful high-frequency focusing characteristics, and the effect of improving the accuracy of fault location

Inactive Publication Date: 2019-02-12
GUILIN UNIV OF ELECTRONIC TECH
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Problems solved by technology

However, the shape of the basic transformation function of the S-transform is fixed, and its window width is "relatively fixed", which cannot realize adaptive adjustment. Therefore, the S-transform has certain shortcomings.
At the same time, most current fault location calculations of transmission lines mostly use the fixed wave velocity method, which affects the accuracy of transmission line fault location to a certain extent. Therefore, the current transmission line fault location method still has certain limitations.

Method used

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  • Distance measurement method for transmission line fault based on TT transform and wave velocity optimization
  • Distance measurement method for transmission line fault based on TT transform and wave velocity optimization
  • Distance measurement method for transmission line fault based on TT transform and wave velocity optimization

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Embodiment

[0043] refer to figure 1 , a transmission line fault location method based on TT transformation and wave velocity optimization, including the following steps:

[0044] 1) Fault signal extraction: Establish a double-ended transmission line fault location model, the model is a 500kV transmission line, where the M terminal and the N terminal are the two ends of the transmission line, L is the length of the line MN, and F is the line fault point, such as figure 2 As shown, in this example, a single-phase ground fault occurs at a distance of 60km from the M terminal, and the fault transition resistance is 10 6 Ω, whether the zero-sequence current of the line increases sharply is used as the criterion for judging the fault of the line. If the zero-sequence current increases sharply, the voltage and current at both ends of the line between 0.04s before the sharp increase of zero-sequence current and 0.06s after the sharp increase are extracted Signal;

[0045]2) Signal decoupling...

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Abstract

The invention discloses a distance measurement method for a transmission line fault based on the TT transform and the wave velocity optimization. The method is characterized by comprising the following steps of: 1) extraction of fault signals; 2) signal decoupling; 3) detection of mutation points of a traveling wave in a fault 1 mode; 4) optimization of a wave velocity; 5) determination of a faultsection; 6) distance measurement for faults. According to the distance measurement method for the transmission line fault based on the TT transform and the wave velocity optimization, the method canimproves the detection precision of the mutation points of the traveling wave, thereby improving the precision of the distance measurement for the transmission line fault; and the application range iswide.

Description

technical field [0001] The invention relates to the field of power system fault detection, in particular to a transmission line fault distance measurement method based on TT transformation and wave speed optimization. Background technique [0002] With the continuous development of society, electric energy plays an increasingly important role in human society, and stable and reliable transmission of electric energy has become a topic of increasing concern. As a key component of power transmission lines, how to quickly and accurately detect the fault location when it fails will effectively solve the problem of long-term power outages caused by finding the fault location and improve the reliability and stability of the power supply system. Significance. [0003] The fault location methods of transmission lines are mainly divided into impedance method and traveling wave method. The impedance method mainly detects the impedance value between the fault point and the measurement...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/08
CPCG01R31/085G01R31/088
Inventor 黄知超覃思明
Owner GUILIN UNIV OF ELECTRONIC TECH
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