螺栓型双导线设备线夹，应用于某35kV变电站，巡视检查中发现其氧化腐蚀严重。采用宏观检验、化学成分分析、扫描电镜及能谱分析等手段对其进行分析检测。结果表明，线夹与铝导线接触面的接触电阻、线夹绝缘罩破损、水分和其他大气成分的腐蚀作用是线夹表面严重氧化腐蚀的外因；设备线夹选材不当，锌含量超标，是线夹形成点蚀形貌的内因，并最终造成线夹表面密集分布的腐蚀坑。提出控制线夹合金成分及含量、降低线夹与导线接触电阻、变电站巡视中注意检查绝缘罩严密性三项建议。
Terminal connectors for double conductors （bolted type） are used in 35 kV substation, severe oxidation corrosion was found during a routine inspection. The causes were studied by means of macrography, chemical composition analysis, SEM and energy spectrum analysis. The external causes made the terminal connector severely oxidized and corroded were contact resistance between connector and wires, damage of insulation cover, corrosion effect of rain water and other atmosphere composition. Improperly selected material for the terminal connector and excessive amount of Zn content were the internal causes of pitting corrosion and intensive distribution of etching pits on the surface of terminal connector. Some suggestions, such as controlling alloy composition and content, reducing the contact resistance between connector and wires, checking the tightness of insulation cover during substation routine inspection, were provided for safet operation of substation equipment.
参考文献
| [1] | 章小鸽.锌和锌合金的腐蚀（一）[J].腐蚀与防护,2006(01):41-50. |
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