通过对高压输电用耐张线夹及夹持导线的宏观形貌、化学成分、腐蚀产物进行分析,探讨了该线夹腐蚀失效的原因.结果表明:该线夹在压接时即存在铝线断股现象,服役过程中使酸性雨水更易进入到压接管内部,对线夹与钢芯铝绞线结合面进行腐蚀生成腐蚀产物,导致耐张线夹电阻增大;随着腐蚀的进行,线夹电阻不断增大,其温度也随之升高;当温度超过临界温度时,热平衡状态被打破,最终线夹过热,导致高温烧损失效;应加强线夹压接管位置的红外测温监控,及时更换温度明显异常的压接管.
The corrosion failure reason of a tension clamp was investigated by the analysis of the macro-morphology, chemical composition and corrosion products of the tension clamp for high voltage electricity transmission and the holding conductor.The results show that some aluminium strands broke during the pressure connecting process of the clamp, which made acidic rainwater easily run into the inside of the pressure connecting pipe during service.So that the joint surface between clamp and aluminium conductor steel reinforced wires corroded and produced corrosion products, resulting in the increased resistance of the tension clamp.With the corrosion continuing, the resistance of the clamp increased, followed by the increase of the temperature.When the clamp temperature increased over the critical temperature, the thermal equilibrium state was broken, finally the clamp was overheated, resulting in the high-temperature combustion failure.The on-line infrared monitoring of temperatures of the clamp pressure connecting pipe should be strengthened, and the pressure connecting pipe with abnormal temperatures should be replaced in time.
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