A method for identifying parameters of single-phase-to-ground faults in transmission lines

A technology for single-phase ground faults and transmission lines, which is applied in the field of fault identification and can solve problems such as large deviations in identification results

Active Publication Date: 2019-02-15
YUNNAN POWER GRID CO LTD ELECTRIC POWER RES INST
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0005] The invention provides a single-phase grounding fault parameter identification method of a transmission line to solve the problem that the identification results of the existing fault parameter identification method have large deviations when gross errors occur in the measurement data

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  • A method for identifying parameters of single-phase-to-ground faults in transmission lines
  • A method for identifying parameters of single-phase-to-ground faults in transmission lines
  • A method for identifying parameters of single-phase-to-ground faults in transmission lines

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Embodiment Construction

[0043] Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, the same numerals in different drawings refer to the same or similar elements unless otherwise indicated. The implementations described in the following exemplary examples do not represent all implementations consistent with the present invention. Rather, they are merely examples of apparatuses and methods consistent with aspects of the invention as recited in the appended claims.

[0044] Please refer to the attached figure 1 , with figure 1 It shows the method flow chart of the transmission line single-phase ground fault parameter identification method provided by the embodiment of the present invention. The description of the following fault parameter identification method is attached figure 1 as the basis.

[0045] The method for identifying parameters of transmissio...

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Abstract

The invention provides a parameter identification method for a single-phase ground fault of a transmission line. In the method for identifying a single-phase ground fault parameter of a transmission line provided by the invention, when a single-phase ground fault occurs, the phasors set on both sides of the hybrid transmission line The measurement device measures the line data, and obtains a new uncertainty estimate by improving the least square method by using the uncertainty estimate. The new uncertainty estimate can eliminate the influence of measurement errors or even gross errors, thereby increasing Reliability and accuracy of parameter identification results. The single-phase grounding fault parameter identification method of the transmission line provided by the invention can accurately locate the faulty line, and thus has a good application prospect.

Description

technical field [0001] The invention relates to the technical field of fault identification, in particular to a parameter identification method for a single-phase grounding fault of a power transmission line. Background technique [0002] With the rapid development of modern cities and towns, the urban space is becoming increasingly tight, and for transmission lines, overhead line corridors not only need to occupy a lot of space resources, but also the vertical and horizontal crossings in the air are not beautiful. Therefore, most urban areas use buried cables instead of overhead lines to transmit power . The laying of a large number of cables not only beautifies the city appearance and optimizes the urban layout, but also the capacitance of the cable is much larger than that of the overhead line, so it can improve the power factor and increase the transmission capacity of the line. Due to the high cost of laying cables, overhead lines are generally still used in areas far ...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/08
CPCG01R31/085G01R31/088Y04S10/52
Inventor 沈鑫闫永梅周年荣刘柱揆马红升张林山王科李月梅常亚东张文斌唐立军
Owner YUNNAN POWER GRID CO LTD ELECTRIC POWER RES INST
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