A single-ended traveling wave ranging method based on voltage-phase relationship
A distance measurement method and voltage phase technology, applied in directions such as the fault location, to achieve the effect of solving the inaccurate distance measurement of remote faults
Active Publication Date: 2016-08-24
STATE GRID CORP OF CHINA +1
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[0004] Aiming at the shortcomings of the existing single-ended traveling wave ranging technology, the present invention provides a single-ended traveling wave ranging method based on the voltage phase relationship, which can fundamentally solve the shortcomings of the existing single-ended traveling wave ranging method
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[0021] In order to clearly illustrate the technical features of this solution, the present invention will be described in detail below through specific implementation modes and in conjunction with the accompanying drawings. The following disclosure provides many different embodiments or examples for implementing different structures of the present invention. To simplify the disclosure of the present invention, components and arrangements of specific examples are described below. Furthermore, the present invention may repeat reference numerals and / or letters in different instances. This repetition is for the purpose of simplicity and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. It should be noted that components illustrated in the figures are not necessarily drawn to scale. Descriptions of well-known components and processing techniques and processes are omitted herein to avoid unnecessarily limiting the...
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A single-ended traveling wave ranging method based on voltage-phase relationship, which includes the following steps: performing fault phase-mode transformation, selecting appropriate voltage modulus and current modulus; Obtain the initial traveling wave voltage; obtain the pre-fault voltage at each point of the line according to the pre-fault voltage component and current component at the measurement point; perform correlation calculation between the initial traveling wave voltage and the pre-fault voltage at each point of the line to obtain the correlation The absolute value of the coefficient; determine the fault point and obtain the fault distance according to the absolute value of the correlation coefficient. The invention first obtains the initial traveling wave voltage after the fault and the voltage before the fault at each point of the line, then performs correlation calculation to obtain the absolute value of the correlation coefficient, and finally finds the fault point and obtains the fault distance. The invention overturns the previous inherent method of single-end traveling wave ranging, and solves the problem of inaccurate far-end fault ranging in the existing single-end traveling wave ranging method.
Description
technical field [0001] The invention relates to a power system fault distance measurement method, in particular to a single-end traveling wave distance measurement method based on voltage phase relationship, and belongs to the technical field of power system ultra-high voltage transmission line protection. Background technique [0002] Fault location of EHV transmission lines is an important field in power system operation management technology. Rapid and accurate determination of the fault point of the transmission line can reduce the burden of line inspection, discover hidden dangers in time, speed up the recovery of power supply on the line, and reduce economic losses caused by power outages. [0003] Traveling wave distance measurement is one of the methods of power system fault distance measurement, which has the functions of protection and distance measurement. Compared with the traditional power frequency ranging method, traveling wave ranging has the advantages of s...
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IPC IPC(8): G01R31/08
Inventor 高效海张浩吴健王浩李琨李菁竹王艳
Owner STATE GRID CORP OF CHINA