交变载荷作用下变电站LY12铸铝金具的断裂原因
Fracture Mechanism of LY12 Cast Aluminum in Substation under Alternating Load
摘 要
通过数值模拟、电化学试验和微观表征明确了新疆风区某750 kV变电站引下线铸铝金具发生断裂的主要原因及其失效过程。结果如下:静风荷载水平向在引下线端点引起的反力大于设计值,同时设计时未考虑引下线端点受到的拉力核弯矩作用。现场试样表现为裂纹+点蚀特征,极化曲线表示为活化腐蚀过程,与实验室在载荷+交流电作用下的结果一致,试样断裂是力学-电化学协同作用的结果。
强风区
LY12铸铝金具
微观形貌
电化学
750 kV
strong wind area
LY12 cast aluminum metal
microscopic morphology
electrochemistry
Abstract
The main cause and failure process of the fracture of the cast aluminum fittings for the down lead of a 750 kV substation in the wind region of Xinjiang were identified through numerical simulation, electrochemical tests, and microscopic characterization.The results indicated that the reaction force caused by the horizontal static wind load at the endpoint of the down lead was greater than the design value, and the tensile force and bending moment acting on the endpoint of the down lead were not considered in design. The on-site sample exhibited crack+pitting corrosion characteristics, and the polarization curve represented the activation corrosion process, which was consistent with the results obtained in the laboratory under the action of load and alternating current, and was the result of the synergistic effect of mechanics and electrochemistry.
中图分类号 TG174. 4 DOI 10.11973/fsyfh-202310021
所属栏目 失效分析
基金项目 国网新疆电力有限公司电力科学研究院科学技术项目(SGXJDK00DYJS2100102)
收稿日期 2023/6/12
修改稿日期
网络出版日期
作者单位点击查看
引用该论文: HE Cheng,ABULAY Adake. Fracture Mechanism of LY12 Cast Aluminum in Substation under Alternating Load[J]. Corrosion & Protection, 2023, 44(10): 111
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