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Lightning Protection Study on 750kV Transmission Line Built in Qin Ling Mountainous Region

Author: SuYuPing
Tutor: LiuYuGen
School: Chongqing University
Course: Electrical Engineering
Keywords: By Ray width Shielding Failure Counterattack Lightning Withstand Level Rate of lightning trip
CLC: TM862
Type: Master's thesis
Year: 2009
Downloads: 229
Quote: 2
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Abstract


Domestic and international operating experience shows that lightning is caused by transmission lines tripping the main reason. With the rapid industrial development and the increase of the power load, the power system EHV transmission lines has been a lot of development, 750kV Northwest power grid will be the main grid formation early in the grid, the grid structure is not sound, its transmission lines suffered lightning damage accident, will lead to huge losses. Therefore, through the Qinling Mountains 750kV transmission line lightning protection technology research has important scientific significance and value of engineering applications. In this paper, the upcoming construction of the Northwest Power Grid 750kV EHV AC transmission project through the Qinling Mountains line lightning relying on in-depth research. Tower different locations using different depending on the wave velocity rod Taduo Bo impedance model and insulator strings intersect flashover model for to calculate transmission lines the counterattack trip rate to establish the non-linear characteristics, combined with the impact of the current flowing grounding resistance-based ATP- Lei the EMTP simulation software EHV AC transmission lines counterattack resistance performance simulation model; taking into account the randomness voltage phase angle of the lightning strike the top of the tower when the wire run, this article assumes that lightning appeared in the exchange of a cycle of any angle interval equal probability, the use of statistical method to determine the the 750kV single back and the same double-circuit transmission lines counterattack lightning withstand level. In this paper, considering strike distance factor k and ground inclination θ the Improved EGM to hit from the coefficient of UHV transmission lines commonly used formula: k = 1.066 - hc/240.5 and introduced by Ray width of the lightning current amplitude value related point, line by Ray width to be amended, with the strike from the Method line equivalent by Ray width. This article using the the exposure distance method calculation line LIGHTNING performance. Impact 750kV single back and the same tower double back to typical tower the line rate of lightning trip of a variety of factors are calculated and analyzed, the following conclusions: the tower in the propagation speed on the counterattack resistant mine performance can not be ignored; counterattack Lightning Withstand Performance With tower call that high reduce grounding resistance decreases and enhance both resistant to lightning performance of transmission lines counterattack obvious; span changes, has little effect on the line counterattack performance; arrangement on the same pole double circuit transmission lines counterattack is not large; impact with the strike the distance factor k increases, equivalent by Ray width decreases, but the ground inclination of 0 °, the values ??of k equivalent by Ray obvious, the width of the ground inclination of 15 °, the values ??of k equivalent by Ray width obvious; Shielding Failure Trip with k decreases, the value of k Shielding Failure Trip rate Research High Tower Shielding THE LIGHTNING performance, you need to select the appropriate k, it will give the results more realistic; With the increase in the inclination of the ground, lightning conductor protection angle increased respiratory known as altitude increases, Shielding Failure Trip rate increases; When the tree to the case of the wire horizontal distance constant with increasing tree height, or when the tree height unchanged with trees in the distance from the wire closer, the shielding effect of the stronger trees.

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CLC: > Industrial Technology > Electrotechnical > High Voltage Engineering > Overvoltage and Its Protection > Over-voltage protection devices
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