Traveling wave fault locating method suitable for high-voltage overhead line-cable hybrid line
A technology of high-voltage overhead lines and mixed lines, which is applied in the direction of fault location, etc., and can solve problems such as difficult to achieve fast and accurate fault location
Active Publication Date: 2015-12-09
ELECTRIC POWER RES INST OF GUANGDONG POWER GRID
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[0003] The technical problem to be solved by the present invention is to provide a traveling wave fault location method suitable for high-voltage overhead wire-cable hybrid lines, so as to overcome the difficulty of fast and accurate fault location for high-voltage overhead wire-cable hybrid lines in the prior art question
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[0025] Such as figure 1 and figure 2 As shown, the present invention is applicable to the traveling wave fault location method of high-voltage overhead line-cable hybrid line, and is suitable for the tested hybrid line composed of at least one section of cable section and at least one section of overhead line connected in series. Alternately set in the line, set: the total number of all cable sections and overhead lines of the tested hybrid line is n sections, n≥2, and they are sequentially represented as line section D from the M terminal to the N terminal of the tested hybrid line 1 ,D 2 ,···,D n , the connection point between the adjacent cable section and the overhead line in the tested hybrid line is denoted as L in sequence from the M terminal to the N terminal 1 , L 2 ,···,L n-1 , the M-terminal and the N-terminal are respectively the head end and the end of the tested hybrid line or the M-terminal and the N-terminal are respectively the end and the head end of th...
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The invention discloses a traveling wave fault locating method suitable for a high-voltage overhead line-cable hybrid line. One traveling wave acquisition device is installed at two ends of a tested hybrid line respectively; injection traveling wave time differences, switching on traveling wave time difference and fault traveling wave time difference are acquired and calculated respectively through the two traveling wave acquisition devices; a characteristic that the wave velocity of traveling wave signals on an overhead line section or a cable section is constant is utilized, so that a line section of the tested hybrid line, where a fault point is located, can be determined accurately and fast through judging whether the fault traveling wave time difference and the injection traveling wave time differences satisfy a judgment condition and based on a sequence of the fault traveling wave time difference and the injection traveling wave time differences to satisfy the judgment condition; and the location of the fault point is accurately located through calculation. With the traveling wave fault locating method of the invention adopted, the problem of difficulty in hybrid line fault locating can be solved, and wave velocity setting is not required, and locating errors can be greatly reduced, and accurate locating of the fault of the high-voltage overhead line-cable hybrid line can be realized. The traveling wave fault locating method has the advantages of high fault locating speed and high fault point locating accuracy.
Description
technical field [0001] The invention relates to a traveling wave fault location method suitable for a high-voltage overhead wire-cable hybrid line. Background technique [0002] There are many researches on the fault location of pure overhead lines at home and abroad, and a variety of online fault location methods have been proposed. Among them, the double-terminal traveling wave location method has the advantages of not being affected by the transition resistance and high location accuracy. It has been widely used in AC and DC overhead transmission lines. However, since the double-terminal traveling wave location method needs to adjust the traveling wave velocity, and the traveling wave velocity of the cable and the overhead line is different, the double-terminal traveling wave location method cannot be directly used for the fault location of the high-voltage overhead line-cable hybrid line. Therefore, there is an urgent need to study new fault location methods suitable fo...
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IPC IPC(8): G01R31/08
Inventor 张健戴祥慧王奕张远孙闻盛超陈迅安然然胡玉岚王俊杰罗勇
Owner ELECTRIC POWER RES INST OF GUANGDONG POWER GRID