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

作　　者：何成 阿布莱·阿达克 HE Cheng;ABULAY Adake(State Grid Xinjiang Electric Power Co.,Ltd.,Electric Power Research Institute,Urumqi 830000,China)

机构地区：[1]国网新疆电力有限公司电力科学研究院,乌鲁木齐830000

出　　处：《腐蚀与防护》2023年第10期111-116,共6页Corrosion & Protection

基　　金：国网新疆电力有限公司电力科学研究院科学技术项目(SGXJDK00DYJS2100102)。

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。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.

关 键 词：750 kV 强风区 LY12铸铝金具 微观形貌 电化学 

分 类 号：TG174.4[金属学及工艺—金属表面处理]