CN203931626U - 一种防水型中压铝合金电力电缆 - Google Patents
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Abstract
本实用新型公开了一种防水型中压铝合金电力电缆,包括多根导体,多根导体外均分别设有内半导电阻水带绕包层,内半导电阻水带绕包层外从内到外设有导体屏蔽层、交联聚乙烯绝缘层、绝缘屏蔽层三层共挤构成绝缘屏蔽线芯,绝缘屏蔽线芯外依次包覆有中半导电阻水带绕包层、金属屏蔽层,包覆金属屏蔽层的多根绝缘屏蔽线芯相互绞合成束构成缆芯,缆芯外包覆有外半导电阻水带绕包层,外半导电阻水带绕包层与缆芯之间设有阻水纱填充层,外半导电阻水带绕包层外依次包覆有聚乙烯隔离套、铝合金带联锁铠装层、聚乙烯外护套层。本实用新型具有防水、防潮、重量轻、价格低、弯曲半径小、使用寿命长、安装方便等优点。
Description
技术领域
本实用新型涉及电线电缆技术领域,尤其涉及一种防水型中压铝合金电力电缆。
背景技术
交联聚乙烯绝缘电力电缆因其具有良好的机械性能和电气性能,在电力系统中得到了广泛的应用。但是在数十年的运行过程中发现,电缆内部受潮或浸水(三芯中压电力电缆,由于线芯间隙大,潮气或水分更容易渗入)以后,导体会过早氧化,电气、绝缘性能会大幅下降,特别是容易引发会严重影响电缆使用寿命和可靠性的水树枝。水树枝的产生将会造成绝缘介质损耗增加,同时降低绝缘电阻及绝缘击穿电压,加快老化速度,缩短电缆使用寿命。最为严重的是,水树枝在电场作用下或长时间的氧化、转化,最终会在水树枝尖端生成电树枝。而电树枝腔体存在不断抗张的局部放电,会导致电缆绝缘在短期内被击穿,严重影响电缆的使用可靠性。但目前常规的电力电缆不具备防水、防潮的性能。
目前电力系统中仍有部分中压电力电缆导体为纯铝芯的,但由于其自身的机械性能差及抗蠕变性差,市场受到了限制。而铜芯中压电力电缆有重量大,反弹性高,安装敷设困难、资源贫乏(价格高)等缺点。传统电力电缆中金属带铠装层采用的材料为不锈钢带或镀锌钢带,但其容易被腐蚀或使用寿命有限,影响电缆的机械安全和电气安全。
综上述这些问题主要有:
1、电缆长期敷设在潮湿或浸泡在水的环境下,潮气或水分会沿着电缆纵向和径向间隙侵入电缆,在运行电压下,更易引发严重影响电缆使用寿命和可靠性的水树枝和电树枝。
2、纯铝芯电力电缆机械性能及抗蠕变性差,接头连接稳定性差。
3、铜芯中压电力电缆重量重,价格高,弯曲半径大,反弹性大、安装难度大。
4、传统电力电缆中的钢带铠装层,易腐蚀和使用寿命有限,影响电缆的机械安全和电气安全。
实用新型内容
为了弥补现有技术问题,本实用新型的目的是提供一种防水型中压铝合金电力电缆,额定电压6~35kV电力系统中,可用于输电系统和配电系统,作电力的载体,广泛用于电力、建筑、工矿、冶金、石油、化工、交通等领域,特别适用于长期处于潮湿或有水的环境中。
本实用新型的技术方案如下:
防水型中压铝合金电力电缆,包括多根导体,其特征在于:所述的多根导体外均分别设有内半导电阻水带绕包层,内半导电阻水带绕包层外从内到外设有导体屏蔽层、交联聚乙烯绝缘层、绝缘屏蔽层三层共挤构成绝缘屏蔽线芯,绝缘屏蔽线芯外依次包覆有中半导电阻水带绕包层、金属屏蔽层,包覆金属屏蔽层的多根绝缘屏蔽线芯相互绞合成束构成缆芯,缆芯外包覆有外半导电阻水带绕包层,外半导电阻水带绕包层与缆芯之间设有阻水纱填充层,外半导电阻水带绕包层外依次包覆有聚乙烯隔离套、铝合金带联锁铠装层、聚乙烯外护套层。
所述的防水型中压铝合金电力电缆,其特征在于:所述的导体采用AA8030系列稀土高铁铝合金导体,加入阻水粉,经分层紧压工艺绞合成防水型导体。
本实用新型的优点是:
1、本实用新型导体为稀土高铁铝合金紧压导体,使电缆具有机械性能高、重量轻、抗蠕变性能强、反弹性低等优异性能,有效地解决了铜芯电缆重量重、反弹性大,铝芯电缆的抗蠕变性能差、安装困难的问题。
2、本实用新型从纵向、径向两种防水结构进行设计,达到了全方位的防水、防潮效果。有效地解决了因电缆受潮或浸水引起的水树枝和电树枝,提高了电缆的使用寿命和可靠性。
3、本实用新型金属铠装材料采用铝合金带,利用连锁铠装的先进工艺。不但可以提高传统电缆的机械安全和电气安全性能、减少线路的损耗,而且还可以起到一定的阻水和阻燃效果。
4、本实用新型的电缆弯曲半径小,有效解决了因施工空间小、弯曲半径大造成的安装困难的问题。
5、本实用新型价格低,铝合金电缆的价格只有铜电缆75%左右,安装成本还可以减少20%--50%。
附图说明
图1为本实用新型的结构示意图。
具体实施方式
参见附图:
防水型中压铝合金电力电缆,包括多根导体1,多根导体1外均分别设有内半导电阻水带绕包层2,内半导电阻水带绕包层2外从内到外设有导体屏蔽层3、交联聚乙烯绝缘层4、绝缘屏蔽层5三层共挤构成绝缘屏蔽线芯,绝缘屏蔽线芯外依次包覆有中半导电阻水带绕包层6、金属屏蔽层7,包覆金属屏蔽层7的多根绝缘屏蔽线芯相互绞合成束构成缆芯,缆芯外包覆有外半导电阻水带绕包层8,外半导电阻水带绕包层8与缆芯之间设有阻水纱填充层9,外半导电阻水带绕包层8外依次包覆有聚乙烯隔离套10、铝合金带联锁铠装层11、聚乙烯外护套层12。
导体1采用AA8030系列稀土高铁铝合金导体,加入阻水粉,经分层紧压工艺绞合成防水型导体。
本实用新型材料的选择、结构设计及具体实施解决的问题如下:
一、防水、防潮问题的解决:
(1)纵向防水、防潮:①在铝合金导体绞合的过程中,利用静电喷涂技术使阻水粉较好的附着在导体单线之间,导体外绕包半导电阻水带。②绝缘线芯成缆的间隙采用阻水纱填充,缆芯外绕包半导电阻水带。
(2)径向防水、防潮:①导体外、绝缘屏蔽外、缆芯外绕包半导电阻水带。 ②缆芯包带外挤包一层聚乙烯(具有优异的防水性能)隔离套,隔离套外联锁铠装铝合金带,铠装层外挤包聚乙烯外护套。以上从纵向、径向两种结构达到了全方位的防水、防潮性能。有效地解决了因电缆受潮或浸水引起的水树枝和电树枝,提高了电缆的使用寿命和可靠性。
二、本实用新型导体采用稀土高铁铝合金导体,以AA8030 系列铝合金材料为导体,采用特殊分层紧压工艺、退火处理及静电喷涂技术,绞合成防水型的紧压导体。该导体重量轻(在满足同等电气性能的前提下,铝合金电缆的重量是铜芯电缆的一半)、抗蠕变性能强(相对于纯铝,抗蠕变性能提高300%)、反弹性低(铝合金电缆反弹角度为铜缆的60%,且无记忆性)等,有效地解决了铜芯电缆重量重、反弹性大,铝芯电缆的抗蠕变性能差、安装困难的问题。
三、金属铠装材料采用铝合金带,并利用连锁铠装的先进工艺,铠装层为自锁形式,机械强度高,不宜腐蚀,有效提高了传统电缆的机械安全和电气安全性能;铝合金带为非磁性材料,即使存在三相不平衡电流,也不会产生涡流,能够减少线路的损耗。而且一旦遇到火灾,可以使内部的绝缘线芯与外部火源良好隔离,起到一定的阻燃效果。另外,由于铠装层为自锁形式,密封性较好,具有一定的径向阻水性能。
四、由于电缆导体采用了柔韧性较好的铝合金材料,不但弯曲过程中不产生裂纹,而且电缆弯曲半径小,一般为电缆外径的7倍,而一般电力电缆的弯曲半径为电缆的10-20倍。有效解决了因施工空间小、传统电力电缆弯曲半径大造成的安装困难的问题。
Claims (2)
1.一种防水型中压铝合金电力电缆,包括多根导体,其特征在于:所述的多根导体外均分别设有内半导电阻水带绕包层,内半导电阻水带绕包层外从内到外设有导体屏蔽层、交联聚乙烯绝缘层、绝缘屏蔽层三层共挤构成绝缘屏蔽线芯,绝缘屏蔽线芯外依次包覆有中半导电阻水带绕包层、金属屏蔽层,包覆金属屏蔽层的多根绝缘屏蔽线芯相互绞合成束构成缆芯,缆芯外包覆有外半导电阻水带绕包层,外半导电阻水带绕包层与缆芯之间设有阻水纱填充层,外半导电阻水带绕包层外依次包覆有聚乙烯隔离套、铝合金带联锁铠装层、聚乙烯外护套层。
2.根据权利要求1所述的防水型中压铝合金电力电缆,其特征在于:所述的导体采用AA8030系列稀土高铁铝合金导体,加入阻水粉,经分层紧压工艺绞合成防水型导体。
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