A Method for Fault Section Identification and Accurate Distance Measurement of Non-full Mixed Voltage Double Circuit Line

Abstract

The invention discloses a non-whole-course hybrid-voltage double-circuit fault segment recognition and precise range finding method. The method comprises the steps: determining the distribution parameters of a system through building a non-whole-course hybrid-voltage double-circuit system model, and solving a phase sequence according to coupling and non-coupling circuits; carrying out the positioning of coupling and decoupling segment faults through employing a positive sequence component, carrying out the analysis of the phase characteristics of a hyperbolic tangent function through employing line parameters, carrying out the position of a fault segment, judging that a single fault is a line-crossing fault or single-line fault, carrying out the judgment of the single-line fault, and determining the fault line; calculating the starting and ending electric quantities of the fault segment, converting fault distance measurement of coupling lines at different voltage levels into the fault distance measurement of a uniform line, employing a phase-mode transformation method for a coupling line with asymmetric parameters to form mutually independent mode quantities, and carrying out distance measurement of a single-lien fault through employing a mode quantity positioning fault and the positive sequence component. The method is simple in discrimination principle, is clear in flow, and lays a foundation for the precise distance measurement.

Description

technical field [0001] The invention relates to a method for fault section identification and precise distance measurement of a non-full-range mixed-voltage double-circuit line. Background technique [0002] Accurate fault location on the transmission line can realize rapid elimination of line faults and timely recovery of line power supply, which is conducive to reducing economic losses caused by power outages. [0003] The number of mixed single-circuit and double-circuit lines of different voltage levels at home and abroad is gradually increasing. The parameters along the non-full-range multi-circuit lines of different voltage levels are no longer uniform, the coupling relationship is more complicated, and the parameters between multi-circuit lines are asymmetrical. Conventional ranging methods It is no longer applicable, and it is necessary to study the fault location method of non-full multi-circuit lines with different voltage levels. [0004] At present, the theories...

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Problems solved by technology

[0003] The number of mixed single-circuit and double-circuit lines of different voltage levels at home and abroad is gradually increasing. The parameters along the non-full-range multi-circuit lines of different voltage levels are no longer uniform, the coupling relationship is more complicated, and the parameters between multi-circuit lines are asymmetrical. Conventional ranging methods No longer applicable, it is necessary to study fault location methods for non-full multi-circuit lines with different voltage levels

[0004] At present, the theories and methods of single-circuit lines and double-circuit lines on the same pole have matured, and research on four-circuit lines on the same pole and four-circuit lines with different voltage levels has also made progress. There are few researches on identification and ranging, and the only research needs to use the fault-occurring section as a prerequisite for ranging, and the accuracy is not high

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