Lightning strike fault line selection and positioning method based on 110kV partial same tower double-circuit line

Abstract

The invention relates to a lightning strike fault line selection and positioning method based on a 110kV partial same tower double-circuit line, and belongs to the technical field of power system relay protection. Firstly, the parameters of a rod tower, lightning current and an insulator are set. From the perspective of the traveling wave propagation process and the coupled current propagation process, the characteristics of the common and different first wave head polarity of each zero-mode current at each measuring end are used when lightning strikes different locations, the positioning of alightning strike fault zone is achieved, based on the principle that when the coupled current traveling wave and the initial fault traveling wave arrive at a certain measuring terminal, the time is different, a lightning fault location is accurately measured, finally, the single-ended ranging is used for analyzing the applicability of the lightning strike fault location of the same tower double-circuit line of a 110kV part, and after the simplified line model is obtained, the single-ended ranging method is used for locating faults.

Description

technical field [0001] The invention relates to a lightning fault line selection and location method based on 110kV partial double-circuit lines on the same tower, and belongs to the technical field of electric power system relay protection. Background technique [0002] With the development of power grid construction, the proportion of 110kV transmission lines in all transmission lines is increasing, and its importance is self-evident. According to the data of a relevant research institute in Yunnan Province, a total of 596 tripping accidents caused by lightning strikes on transmission lines of 110kV and above occurred in Yunnan Province in a certain year (2009-2010), accounting for 54.6% of the total tripping times. Among them, 500kV, 220kV and 110kV transmission lines caused tripping accidents by lightning strikes 39 times, 113 times and 444 times respectively. Since 110kv transmission lines account for a large proportion in the transmission system, there are often more ...

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Problems solved by technology

However, after a lot of verification, this method is not applicable to some lines on the same tower with closed-loop networks

Although scholars from various countries have conducted some research on the fault location technology of double-circuit lines on the same tower, most of the existing research analyzes are aimed at the entire double-circuit line on the same tower or only for a specific line situation, while some 110kV double-circuit lines on the same tower Lines occupy a certain proportion in actual operation. There is a lack of effective analysis for this type of line, and its applicability to existing distance measurement methods also needs to be studied. Therefore, the analysis of this type of line is of great importance to the safe and stable operation of the 110kV system. extremely important

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