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Double-terminal ranging method based on line parameter detection and data asynchronous verification

A line parameter, double-ended ranging technology, applied in the direction of detecting faults and fault locations according to conductor types, to achieve the effects of improving stability, improving ranging accuracy, and optimizing ranging results

Active Publication Date: 2018-08-10
WUHAN UNIV +1
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Problems solved by technology

[0004] The present invention mainly solves the technical problems existing in the existing methods, and designs a double-terminal ranging method based on line parameter detection and data asynchronous verification

Method used

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  • Double-terminal ranging method based on line parameter detection and data asynchronous verification
  • Double-terminal ranging method based on line parameter detection and data asynchronous verification
  • Double-terminal ranging method based on line parameter detection and data asynchronous verification

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Embodiment Construction

[0033] The technical solutions of the present invention will be further specifically described below through the embodiments and in conjunction with the accompanying drawings.

[0034] see figure 2 , an embodiment of the present invention comprises steps as follows:

[0035] Step 1. The step of detecting the fault starting point at both ends: use the wavelet modulus maximum method to detect the fault starting point corresponding to the sampling data at both ends of the fault line.

[0036] see figure 1 , one end (left end) of the line is m-terminal, the other end (right end) is n-terminal, E m ,E n and Z m ,Z n Represent the voltage and impedance of the m-terminal and n-terminal power supplies respectively, l is the length of the line, and a short-circuit fault occurs at point f of the line. Note that the fault starting point corresponding to the detected m-terminal fault data is n m0 , the fault starting point corresponding to the n-terminal fault data is n n0 ;

[...

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Abstract

The invention provides a line parameter detection and data non synchronous verification-based double-end ranging method. The method includes the following steps that: fault staring points corresponding to sampling data at two ends of a fault line are detected, the initial value of a non-synchronous angle between the fault staring points of the data at the two ends is calculated according to the electrical quantity of the fault line in normal operation, the initial value of a fault distance is calculated; and iteration is carried out to realize correction: the non-synchronous angle of the two ends is corrected according to the fault distance, online parameters of the line are calculated, ranging results are optimized, and when allowable error is satisfied, ranging is terminated. According to the method of the invention, the change of the parameters of the line and synchronization of the data at the two ends of the line are fully considered; a ranging result optimization method is utilized to well eliminate the influence of fault phasor measurement deviation on the ranging results, and therefore, fault location accuracy of the power transmission line can be effectively improved.

Description

technical field [0001] The invention relates to the field of transmission line fault location, in particular to a double-terminal ranging method based on line parameter detection and data asynchronous verification. Background technique [0002] As an important transmission line fault location method, the fault analysis method utilizes the current and voltage before and after the line fault combined with relevant line parameters for fault location. Most of the existing fault analysis methods regard the line parameters as known when measuring the distance. However, in practice, the line parameters will change more or less due to the influence of climate, environment and geographical factors after the line is put into operation. Therefore, using offline It is bound to produce errors in distance measurement with parameters. The double-ended method in the fault analysis method is widely used because of its advantages of high ranging accuracy, simplicity and practicality. In add...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/08
CPCG01R31/085
Inventor 龚庆武占劲松魏东
Owner WUHAN UNIV
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