Method for measuring lightning shielding failure trip-out rate of high-voltage power transmission line by combining topography

A high-voltage transmission line, shielding trip rate technology, applied in the direction of measuring electricity, measuring electrical variables, measuring devices, etc., can solve the problem of difficulty in obtaining the height of any point-conducting ground wire

Inactive Publication Date: 2010-12-01
SOUTHWEST JIAOTONG UNIV
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Problems solved by technology

[0003] The present invention is mainly to solve the problem that it is difficult to obtain the actual parameters of the terrain of the corridor of the high-voltage transmission line and the height

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  • Method for measuring lightning shielding failure trip-out rate of high-voltage power transmission line by combining topography
  • Method for measuring lightning shielding failure trip-out rate of high-voltage power transmission line by combining topography
  • Method for measuring lightning shielding failure trip-out rate of high-voltage power transmission line by combining topography

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Embodiment Construction

[0065] Below through embodiment, in conjunction with appendix figure 1 , to further illustrate the technical solution of the present invention;

[0066] The first step is to obtain the transmission line parameters. The tower base is 3 bases, the wire type is 4XLGJ-400 / 35, and the linear expansion coefficient is 20.5×10 -6 l / ℃, the specific load of self-weight is 31.11×10 -3 N / mm 2 , elastic elongation coefficient 65000N / mm 2 , the calculated temperature is 40 degrees, the control condition is temperature, and the specific load under the control condition is 31.11×10 -3 N / mm2, the temperature under control conditions is 20 degrees. The model of the ground wire is LBGJ-120-40AC, the coefficient of linear expansion is 15.5×10-6l / ℃, and the specific load of self-weight is 46.141×10 -3 N / mm2, elastic elongation coefficient 98100N / mm 2 , the calculated temperature is 40 degrees, there are two control conditions, the low temperature control data is 100 meters to 206 meters, th...

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Abstract

The invention discloses a method for measuring a lightning shielding failure trip-out rate of a high-voltage power transmission line by combining topography. The method comprises the following steps of: acquiring related parameters of the power transmission line, dividing the power transmission line into a plurality of intervals according to a pole tower, dividing each interval into a plurality of small sections by adopting an equal division method, calculating longitude and latitude coordinates of each section and an auxiliary point vertical to each section through longitude and latitude coordinates of the pole tower, further acquiring altitudes of each section and the auxiliary point by adopting geographic information system software, finally calculating a ground inclination angle of each section according to the height difference and distance between the auxiliary point and the subsection point, and calculating the shielding failure trip-out rate of each section by using an electric geometrical model considering the striking distance coefficient and the ground inclination angle. The method can conveniently calculate the ground inclination angle at the pole tower of the power transmission line, reflect the actual topographical characteristics of a corridor of the power transmission line, and provide reliable basis for evaluating the lightning protection effect of a lightning wire of the power transmission line.

Description

Technical field [0001] The invention relates to a method for measuring the lightning shielding tripping rate of high-voltage transmission lines combined with topography and landforms, in particular to a lightning shielding tripping method for high-voltage transmission lines based on an electrical geometric model that combines terrain data with characteristics of line conductors and ground wires It is a power measurement method, suitable for lightning protection design and lightning protection transformation of transmission lines, and belongs to the field of overvoltage in power systems. Background technique [0002] my country's high-voltage transmission lines usually use lightning protection lines for lightning protection, but lightning shielding wires still occur. For example, lightning trips on 500kV ultra-high voltage transmission lines in Anhui account for 70% of the total trips, and 500kV lightning trips in Guizhou Power Grid account for 71.6% of the total trips. ; Stat...

Claims

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Application Information

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IPC IPC(8): G01R31/08G01R31/02
Inventor 吴广宁曹晓斌李瑞芳周利军高国强高波朱军马御棠刘君
Owner SOUTHWEST JIAOTONG UNIV
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