铝包带包裹高压输电线路导线的微动损伤

Fretting Damage of ACSR Conductor Enwrapped with Aluminium Armour Tape

在自制的微动试验装置上对铝包带包裹钢芯铝绞导线(ACSR)进行微动试验研究。振幅1.0mm,2.0×107次微动循环后,研究内、外层铝股线及钢芯线的磨损状况,测定其抗拉强度,探讨铝包带包裹导线的微动损伤机制。结果表明:外层铝股线表面经受铝包带的刮擦以及磨粒磨损;内层铝股线微动磨损斑呈椭圆形,部分磨损斑下有疲劳裂纹;而钢芯线的损伤微弱,仅发生镀锌层的磨损、脱落。铝包带对导线有较好的保护作用,内外层铝股线的抗拉强度均高于未包裹导线的抗拉强度。

Abstract ： Fretting experirr, ent of the aluminum conductor steel reinforced （ACSR） conductor enwrapped with aluminium armour tape was carried out using a conductor fretting testing equipment made by the authors. After fretting for 2.0X 10r cycles at an amplitude of 1.0 ram, fretting damage of the external and internal A] strands and steel core strands of the conductor was investigated, and the tensile strengths of them were also measured. Moreover, the fretting damage mechanism of the enwrapped conductor was discussed. The results showed that the external A] strands were injured by the scratch of the aluminium armour tape and the abrasive wear. The wear marks of the internal A1 strands were all elliptical, partially, there were fatigue cracks under them. The steel core strands were slightly damaged, only adhesion wear and piece deprivation of the galvanized zinc layer took place. The aluminium armour tape could effectively protect the ACSR conductor, so that the internal and external A1 strands of the enwrapped conductor had higher tensile strengths than those of the unenwrapped conductor.