高压输电用耐张线夹的失效分析
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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.
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.
引文
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[2]王凤平,张学元,杜元龙.大气腐蚀研究动态与进展[J].腐蚀科学与防护技术,2000,12(2):104-108.
[3]张建堃,陈国宏,王家庆,等.干/湿NaCl盐雾条件下钢芯铝绞(ACSR)导线腐蚀层结构及腐蚀机理[J].腐蚀与防护,2010,31(8):581-586.
[4]蔡健平,刘明,罗振华,等.航空铝合金大气腐蚀加速试验研究[J].中国腐蚀与防护学报,2005,25(5):262-266.
[5]范巍,陈韶瑜,兰春虎.架空导线线夹表面氧化分析及改进措施[J].腐蚀与防护,2012,33(9):826-828.
[6]周和荣,李晓刚,董超芳,等.铝合金在NaHSO_3溶液中干湿周浸腐蚀行为[J].中国腐蚀与防护学报,2008,28(6):345-350.
[7]FUENTE D D,OTERO-HUERTA E,MORCILLO M.Studies oflong-term weathering of aluminum in the atmosphere[J].Corrosion Science,2007,49:3134-3148.
[8]MENDOZA A R,CORVO F.Outdoor and indoor atmospheric corrosion of nonferrous metals[J].Corros.Sci.2000,42:1123-1147.
[9]李雪.耐热导线耐张线夹发热问题解决方案研究[D].保定:华北电力大学,2010.
[10]葛猛,姜大宇,梁之林.架空地线耐张线夹过热原因分析[J].电力安全技术,2005,7(4):17-22.
[11]葛猛,姜大宇,梁之林.220KV输电线路耐张线夹过热原因分析[J].吉林电力,2005(1):49-50.
[12]王煦,陈国宏,王家庆.钢芯铝绞架空导线微动疲劳断口形貌[J].中国有色金属学报,2012,22(1):194-200.