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韓軍科，楊靖波，楊風(fēng)利
（中國(guó)電力科學(xué)研究院，北京100192）

[摘要] 2008年初電網(wǎng)冰災(zāi)給我國(guó)輸電線路造成了嚴(yán)重的破壞。500kV輸電線路受損嚴(yán)重，由于直線塔承受覆冰不平衡張力的能力遠(yuǎn)小于耐張塔，導(dǎo)致雙回路輸電線路的破壞絕大部分是由雙回路直線塔的倒塌引起的。為了弄清冰災(zāi)區(qū)雙回路直線塔的受力特點(diǎn)，選取浙江省冰災(zāi)區(qū)500kV線路中的雙回路直線塔進(jìn)行均勻覆冰荷載和不均勻覆冰荷載作用下鐵塔覆冰破壞模式分析。通過(guò)破壞模式的分析，確定雙回路直線塔覆冰荷載作用下的起始破壞部位，提出冰災(zāi)區(qū)雙回路直線塔加固補(bǔ)強(qiáng)的措施。研究結(jié)果為我國(guó)冰災(zāi)區(qū)雙回路直線塔的設(shè)計(jì)和加固補(bǔ)強(qiáng)提供參考依據(jù)。
[關(guān)鍵詞] 輸電線路；雙回路直線塔；覆冰不平衡張力；覆冰破壞模式；加固補(bǔ)強(qiáng)

    Analysis of failure mode on fouble circuit tangent towers in ice disaster area
    Han Junke,  Yang Jingbo,  Yang Fengli
    ( China Electric Power Research Institute, Beijing 100192, China)

Abstract: The ice disaster of power grid in early 2008 caused by ice coating in transmission lines caused great damage in China, and the 500kV transmission lines damaged seriously. Because strain towers can withstand greater unbalanced tension for ice coating than tangent towers, so most destroy of double circuit transmission lines was caused by the collapse of double circuit tangent towers. In order to seek the performance and the characteristics of double circuit tangent towers under ice coating, the failure mode of double circuit tangent towers on the uniform ice formation and non-uniform ice formation was analyzed, which were selected from the 500kV transnussion lines in ice disaster area of Zhejiang province. The initial failure position of double circuit tangent towers under ice coating was confirmed and the reinforcement and strengthening measures were proposed by the failure mode analysis. The research results provide very important reference for the double circuit tangent towers design and strengthening in ice disaster area.
Keywords: overhead transmission line; double circuit tangent tower; unbalanced tension for ice coating; failure mode for ice coating; reinforcement and strengthening method