Electric transmission line traveling wave fault distance measurement method based on regional data

Abstract

The invention provides an electric transmission line traveling wave fault distance measurement method based on regional data. The method comprises the following steps that the structure of a regional power grid structure is analyzed; fault distance measurement calculation is carried out through regional power grid data; reflected wave identification is carried out, and electric transmission line traveling wave fault distance measurement is carried out through a single-end traveling wave method. According to the method, distance measurement calculation is carried out through transformer substation data related to fault lines in a regional power grid, a system can normally work under the conditions that devices on one side break down, a GPS is lost and communications are interrupted, and the overall reliability and precision of an electric transmission line traveling wave fault distance measurement device are improved.

Description

technical field [0001] The invention belongs to the technical field of electric power system automation, and in particular relates to a method for distance measurement of traveling wave faults of transmission lines based on area data. Background technique [0002] After the transmission line fails, even if the reclosing is successful, line inspectors are required to find the fault point, and judge whether it can continue to operate or whether it needs to be powered off for maintenance according to the degree of damage caused by the fault, so as to eliminate hidden dangers. Therefore, quickly finding the fault point after a line fault (transmission line fault location technology) has become a key technology to ensure the safe and stable operation of the power grid. [0003] Transmission line traveling wave fault locating device (hereinafter referred to as fault locating device) has been widely used in my country's 110kV and above power grids due to its high ranging accuracy a...

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Problems solved by technology

[0007] In the above formula: l 1 is the fault distance; t′ 1 , t' 2 are the time for the traveling wave to reach both ends of the line, L is the total length of the faulty line, v 1 For the wave velocity of the faulty line, only the initial wave head of the signal needs to be identified in the calculation of the double-ended traveling wave method, which is simple and reliable, and is the main method in practical application at present, but it requires data from devices on both sides of the line, and requires an independent communication channel and GPS support, the system composition is relatively complex

[0008] The transmission line fault location system based on the double-ended traveling wave method has shown good algorithm reliability in actual operation, but the system as a whole involves multiple links such as sampling, GPS, and communication. When a problem occurs in one of the above links, it will lead to Fault location fails, system reliability is difficult to guarantee

[0009] The single-ended traveling wave method has the same measurement accuracy as the double-ended traveling wave distance measurement under the condition that the reflected wave is identified correctly. However, in actual engineering applications, affected by factors such as signal resonance, it is successful to rely on polarity and amplitude to identify the reflected wave. Compared with the double-ended traveling wave method, the single-ended traveling wave method is less reliable in ranging, but it only needs data from one side of the line and does not depend on GPS, communication, etc.

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