某1 000kV特高压站电抗器储油柜联管开裂原因分析

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摘要本文对一起蒙东地区1 000kV电抗器联管开裂事件进行分析。为了查明联管开裂原因、了解联管管材的健康状况,利用外观形貌分析、断口分析、X射线数字成像（DR）透视检测、化学成分分析、金相显微组织检测、力学性能检测及强度校核计算等方法对开裂联管进行综合性试验分析。结果表明,开裂发生于联管上接高压测装的支管角焊缝两侧的焊趾处,管壁厚度偏差较大,支管角焊缝均存在不同程度的夹渣、气孔及未焊透等焊接缺陷;开裂的联管支管断口起裂于外壁,断口上大部分区域为扩展区,扩展区宏观上可观察到“海滩状”疲劳辉纹,微观上可观察到明显的疲劳条带,为典型的疲劳断裂,联管内外表层均存在明显的全脱碳层缺陷,这降低了管材的疲劳强度。

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	党乐
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	张威
	郝建国

关键词 ： 1 000kV特高压, 电抗器, 联管, 开裂泄漏, 疲劳, 全脱碳层

Abstract：This paper analyzes the failure of a 1 000kV reactor joint pipe cracking in the eastern region of Inner Mongolia. For identifying the causes of the cracking of the joint pipe and understanding the health status of the pipe material, a comprehensive experimental analysis is conducted on the cracked joint pipe using methods such as appearance morphology analysis, fracture analysis, digital radiography (DR) fluoroscopy detection, chemical composition analysis, metallographic microstructure detection, mechanical property detection, and strength verification calculation. The results indicated that the cracking occurres at the weld toes on both sides of the branch pipe fillet weld connected to the high- pressure measuring device on the joint pipe. The thickness deviation of the pipe wall is significant, and there are welding defects such as slag inclusion, porosity and incomplete penetration in the branch pipe fillet weld to varying degrees. The fracture of the cracked branch pipe starts from the outer wall, and most of the area on the fracture surface is an extension zone. Macroscopically, beach shaped fatigue striations can be observed in the extension zone, while microscopically, obvious fatigue bands can be observed, indicating a typical fatigue fracture. There are obvious fully decarburized layer defects on both the inner and outer surfaces of the pipe, which reduces the fatigue strength of the pipes.

Key words： 1 000kV ultra-high voltage reactor joint pipe cracking and leakage fatigue fully decarburized layer

收稿日期: 2023-08-30

作者简介: 党乐（1987—）,男,内蒙古自治区包头市人,硕士,高级工程师,主要从事电网材料技术监督及电网新材料的研究应用工作。

引用本文:

党乐, 董俊谦, 崔亚茹, 张威, 郝建国. 某1 000kV特高压站电抗器储油柜联管开裂原因分析[J]. 电气技术, 2023, 24(11): 48-53. DANG Le, DONG Junqian, CUI Yaru, ZHANG Wei, HAO Jianguo. Analysis of cracking and leakage of reactor oil storage tank joint pipe in a 1 000kV ultra-high voltage substation. Electrical Engineering, 2023, 24(11): 48-53.

链接本文:

http://dqjs.cesmedia.cn/CN/Y2023/V24/I11/48

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