摘要
高压输电用耐张线夹在服役过程中常常因腐蚀而失效。为提高耐张线夹的使用寿命,检测了失效耐张线夹表面腐蚀产物的微观结构和化学成分,并与未失效的耐张线夹进行了对比。研究了耐张线夹的腐蚀机制。结果表明:失效线夹在服役过程中产生了断股现象,导致水汽或雨水进入线夹,加速了耐张线夹的腐蚀。红外测温发现,线夹接头处的温度会随其表面腐蚀产物覆盖率的增大而升高。此外,由激光测震发现,线夹压接部位的铝线断裂,也导致了线夹失效。
Tension strain clamp used for high-voltage transmission becomes frequently invalid due to corrosion in service. In order to prolong service life of the tension strain clamp the microstructure and chemical composition of corrosion product on the tension strain clamp were detected, and compared with those of intact tension strain clamp. The mechanism whereby the tension strain clamp was subjected to corrosion was investigated. The results showed that the failed tension strain clamp offered strand fracturing which occurred in service, resulting in easy penetration of brume or rain into it and thus accelerating its corrosion. From infrared temperature measuring it was seen that temperature of the clamp joint would rise with the increase in area of corrosion product on the clamp. In addition, from laser vibration survey it was discovered that aluminum wires broke in pressure contact zone, which caused the tension strain clamp to become invalid too.
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