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Electric transmission line lightning-protection performance assessment method combined with distributed lightning current monitoring

A transmission line and lightning current technology, which is applied in the field of lightning protection performance evaluation of transmission lines, can solve problems such as lightning fault types and lack of careful consideration of shielding risk sources

Active Publication Date: 2014-06-25
STATE GRID CORP OF CHINA +3
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  • Claims
  • Application Information

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Problems solved by technology

The lightning protection performance evaluation is based entirely on the data obtained by the lightning location system, and the type of lightning fault and the source of shielding risk are not carefully considered. For transmission lines with high voltage levels, there are usually more shielding trips than counterattack trips. Risk sources need to be carefully analyzed

Method used

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  • Electric transmission line lightning-protection performance assessment method combined with distributed lightning current monitoring
  • Electric transmission line lightning-protection performance assessment method combined with distributed lightning current monitoring

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Embodiment Construction

[0022] Below, the embodiments of the present invention will be further described in conjunction with the accompanying drawings.

[0023] The distributed lightning current monitoring device used in the present invention is an existing product purchased (two patents have been applied for, and the application numbers are 2012100443123 and 2013202574571), and the relevant lightning current data required by this method can be obtained. Install one at 15 to 20 kilometers as a monitoring point. The device samples and measures the line current to obtain the transient waveform of the fault phase current, accurately and concisely obtain lightning current data, identify the fault type and locate the lightning strike fault point. Such as figure 1 Shown, the step of method of the present invention comprises:

[0024] (1) Acquisition and statistics of basic information

[0025] Divide the line into sections, and obtain the ground flash density value N of each section from the lightning lo...

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Abstract

The invention discloses an electric transmission line lightning-protection performance assessment method combined with distributed lightning current monitoring. The method includes the following steps that line corridor lightning characteristic parameters, line characteristic parameters and history lightning stroke fault information are obtained; the tower back striking trip-out rate Pf and tower shield failure trip-out rate Pr of each section under the actual cloud-to-ground lightning intensity are calculated according to the cloud-to-ground lightning intensity of the sections of a line corridor; the lightning trip-out rate assessment index in the electric transmission line operation rule is converted to the average cloud-to-ground lightning intensity of the line, and an actual lightning trip-out rate assessment index S is obtained; S is divided into Sf and Sr according to the occurrence ratio of the back striking trip-out and shield failure trip-out with the history lightning stroke fault information as a reference, and risk grade standards are divided according to the value of Sf and the value of Sr; the intervals of Pf, Pr and risk grades are compared, and the back striking trip-out risk grade and the shield failure trip-out risk grade of each base tower are determined. By the method, the standards of the back striking trip-out risk grade and the shield failure trip-out risk grade can be divided accurately, and the overall lightning-protection performance of the line is assessed.

Description

technical field [0001] The invention relates to the field of power grid lightning protection, in particular to a lightning protection performance evaluation method for transmission lines based on distributed lightning current monitoring, which is suitable for lightning protection performance evaluation and lightning protection transformation of high-voltage, ultra-high voltage and ultra-high voltage overhead transmission lines in electric power systems. Background technique [0002] The lightning protection design of transmission lines is very important to the safety and economy of transmission lines, so it is necessary to conduct lightning protection assessment for transmission lines. Among them, lightning current, lightning fault characteristics and lightning fault location are important references in the lightning protection design of transmission lines. The accurate value of lightning current, the accurate judgment of lightning fault type and the accurate location of ligh...

Claims

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Application Information

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IPC IPC(8): G01R31/00G01R31/08
Inventor 马勇路永玲刘洋周志成高嵩陈杰陈光赵淳苏杰雷梦飞
Owner STATE GRID CORP OF CHINA
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