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首页> 外文会议>CIGRE Session >ASSESSMENT OF THE IMPACTS OF INCREASING STRUCTURAL RELIABILITY AND SECURITY BY DESIGNING LINES FOR LONGITUDINAL BROKEN CONDUCTOR AND UNBALANCED ICING LOADS
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ASSESSMENT OF THE IMPACTS OF INCREASING STRUCTURAL RELIABILITY AND SECURITY BY DESIGNING LINES FOR LONGITUDINAL BROKEN CONDUCTOR AND UNBALANCED ICING LOADS

机译：评估通过设计纵向断裂导体和不平衡糖衣载荷的线条越来越多的结构可靠性和安全性的影响

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In order to increase security, lines can be designed for many combinations of broken conductor loads (BCL) and/or using load reduction devices with or without anti-cascading structures. Comparatively, line reliability can be increased by designing lines for unbalanced ice loads. This paper reviews unbalanced ice and broken conductor loads requirements of some international standards and practices (IEC 60826, EN 50341 and ASCE 74 (2006 draft) as well as practices from CEATI1 utilities. Subsequently, longitudinal structure loads were calculated and compared with transverse weather loads using five different lines (161 kV to 735 kV with wood H frame, steel pole, and lattice steel towers). These lines and structures were modeled in PLS software. Subsequently, a parametric study was performed in order to assess the variation of the results with: a) flexibility of structures, b) length of suspension insulator string, c) number of spans to next dead-end structure, d) magnitude of the design ice thickness, and e) broken conductor dynamic load factor. This study confirmed that for the structures used in this study, broken conductor loads can be particularly critical for the design of crossarms and GW peaks. Similarly, unbalanced ice loads can control the bracing in the longitudinal faces of square based lattice structures. In the parametric sensitivity study, many important results were obtained: The natural flexibility of suspension structures will reduce unbalanced loads, even in the case of self supporting lattice structures, and should always be taken into account. In very flexible wood H frame structures, the GW acts as a longitudinal guy that opposes the movement of the structure and significantly reduces the longitudinal ground line moment of the poles. The number of suspension spans from the assessed tower to the next dead-end structure, and the length of the insulator strings were also found to significantly affect unbalanced loads. Finally, it was confirmed that the importance of unbalanced ice loads relative to transverse wind loads significantly increase with an increasing design ice thickness (≥40 mm). Furthermore, the impact of longitudinal unbalanced loads on structure design was assessed on three 230 kV structures (wood H frame, lattice, and steel pole). These structures were first optimized without longitudinal unbalanced loads and then re-optimized using various scenarios of unbalanced security and ice loads. The results confirmed an increase of weight from 4 to 10% for the square based 230 kV lattice steel tower if minimum code requirements were used. The steel pole structure was not noticeably affected by unbalanced loads because of its geometrical properties and flexibility. Finally the wood pole H frame required a change in its crossarm to resist minimum unbalanced loads. This study has also highlighted problems of clearances between upper ground wire or conductor and lower conductors. Lesser clearance problems occurred on horizontal phase configurations and higher voltage lines than with double circuit lower voltage. In vertical phase configuration, structures without horizontal offsets between vertical phases were more problematic that those with an offset.
机译：为了增加安全性，线条可设计用于破碎导体负载（BCL）和/或使用负载降低设备具有或不具有抗级联结构的许多组合。相比较而言，线可靠性可以通过设计为不平衡冰载荷线而增加。从CEATI1公用事业的一些国际标准和惯例，本文回顾不平衡冰破导体负载要求（IEC 60826，EN 50341和ASCE 74（2006年草案），以及实践。随后，计算，并与横向的天气负荷相比纵向结构载荷使用五种不同的线（161千伏到735千伏用木H帧，钢杆，和晶格钢塔），这些线和结构在PLS软件进行建模。随后，参数研究，以评估结果的变化进行用：1）的结构的灵活性，b）中悬式绝缘子串的长度，c）中的跨度距离下死端结构的数目，d）设计冰厚度的大小，以及e）断裂导体动态负载因素。这项研究证实，在这项研究中使用的结构，打破导体负载可以为交叉臂和GW峰的设计尤为关键。同样，不平衡冰载荷可以基于正方形晶格结构的纵向面控制支撑。在参数敏感性研究，获得了许多重要成果：悬挂结构的灵活性自然会减少负载不平衡，即使在自支撑晶格结构的情况下，并应始终予以考虑。在非常灵活的木H帧结构中，GW充当反对结构的运动和显著减少磁极的纵向接地线瞬间纵向人。悬浮液跨距从分摊塔到下死端结构，和绝缘体串的长度的数量，还发现显著影响不平衡负载。最后，确认了不平衡冰载荷相对于横向风荷载的重要性与增加的设计冰厚度（≥40毫米）显著增加。此外，在结构设计纵向不平衡负载的影响进行了评估在三个230千伏结构（木H帧，晶格，和钢极）。无纵向不平衡负载首先优化这些结构，然后重新优化使用不平衡安全和冰载荷的各种情况。如果使用最小码要求的结果证实从4％至10％为方形基于230千伏晶格钢塔的增加重量。钢柱结构没有明显的负载不均衡，因为它的几何特性和灵活性的影响。最后，木杆H帧需要在其横担的变化以抵抗最小不平衡负载。这项研究还突出上部地线或导体和下部导体之间的间隙的问题。发生在水平相位构造和比具有双回路低电压更高的电压线较小间隙的问题。在垂直相位结构中，没有垂直相间水平偏移结构是更成问题的是那些具有偏移。

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