CN110473659A - 一种防雷直埋电缆 - Google Patents
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Abstract
本发明涉及一种防雷直埋电缆,它包括导体,在所述导体外部挤包设有绝缘层,它们组成导电单元,所述导电单元至少设置两个,在所述导电单元外部间隙设有填充,它们组成缆芯,在缆芯外部挤包设有内护套,在所述内护套外部间隔设有中性线芯和半导电填充条,所述中性线芯包括中性线芯导体,在所述中性线芯导体外部挤包设有半导电层,在所述中性线芯和半导电填充条外部挤包设有外护套。本发明在有雷电时能够即时将电流导通到大地,提高电缆运行安全性。
Description
技术领域
本发明涉及一种电缆,具体涉及一种防雷直埋电缆。
背景技术
随着对户外,野外资源的开采,电力电缆直埋敷设于地下的工程越来越多,而对于电缆安全管理就比较难,尤其是当室外环境恶劣,出现雷电等现象时。目前主要采取对电缆护套进行多对地接触,安装接地装置。这不仅增加了敷设运行成本,同时也加大了水分入侵电缆的概率,造成电缆使用寿命降低。
发明内容
发明目的:本发明的目的是为了克服现有技术中的不足,提供一种在有雷电时能够即时将电流导通到大地,提高电缆运行安全性的防雷直埋电缆。
技术方案:为了解决上述技术问题,本发明所述的一种防雷直埋电缆,它包括导体,在所述导体外部挤包设有绝缘层,它们组成导电单元,所述导电单元至少设置两个,在所述导电单元外部间隙设有填充,它们组成缆芯,在缆芯外部挤包设有内护套,在所述内护套外部间隔设有中性线芯和半导电填充条,所述中性线芯包括中性线芯导体,在所述中性线芯导体外部挤包设有半导电层,在所述中性线芯和半导电填充条外部挤包设有外护套。
所述导体和中性线芯导体都采用镀锡铜绞线制成。
所述绝缘层采用交联聚乙烯或聚乙烯制成。
所述填充采用阻水绳制成。
所述内护套采用防水线性低密度聚乙烯制成,其厚度不小于2mm。
所述半导电层和半导电填充条都采用低密度聚乙烯与导电炭黑制成。
所述外护套为交联型半导电套,其厚度大于3mm。
中性线芯导体采用半导电挤包后缠绕在主线芯保护层外,并完全被半导电外护套包裹,当有雷电发生时,中性线通过的电流瞬间接通到大地之中,保证电力运行的安全。
中性线芯导体总截面积根据主线芯截面积确定。挤包半导电的中性线芯均匀对称缠绕在内护套外,中心线芯之间采用半导电填充条填充间隙。
外护套采用交联型的半导电材料。以乙烯-醋酸乙烯酯为基料,添加导电炭黑,敏化剂等混合挤出后,采用辐照工艺进行交联,交联使护套具有优良的机械性能。外护套挤出采用挤压式,填满所有中性线芯外的间隙,保护中性线芯在通电时瞬间将电流接入到大地。外护套具有半导电性、优良的物理机械性能及防水性。
绝缘采用交联聚乙烯或聚乙烯,内护套采用线性低密度聚乙烯,均具有优良的防水性,防止直埋土壤中的水分侵入影响绝缘性能。
有益效果:本发明与现有技术相比,其显著优点是:本发明整体结构设置合理,绝缘层采用交联聚乙烯或聚乙烯制成,具有优良的电气绝缘性能,物理机械性能及防水性;采用阻水绳填充,将电缆填充圆整的同时,阻止外部环境中水分的侵入;内护套采用防水性能优良的线性低密度聚乙烯,厚度不小于2mm;半导电层及半导电填充条采用低密度聚乙烯与导电炭黑的混合物,其导电性能设计为略高于外护套,以保证通过中性线芯的雷电或其它故障电流顺利瞬间通过半导电层及外护套引入到大地之中,保护电缆运行及外界环境的安全;外护套采用交联型的半导电材料,以乙烯-醋酸乙烯酯为基料,添加导电炭黑,敏化剂等混合挤出后,采用辐照工艺进行交联,外护套挤出采用挤压式,填满所有中性线芯外的间隙,将中性线芯完全包裹,保护中性线芯在通电时瞬间将电流接入到大地,外护套具有半导电性、优良的物理机械性能及防水性,外护套的径向电阻率达到40Ω.m,抗张强度达到10N/mm2。
附图说明
图1 是本发明的结构示意图。
具体实施方式
下面结合附图和实施例对本发明作进一步的说明。
如图1所示,本发明所述的一种防雷直埋电缆,它包括导体1,在所述导体1外部挤包设有绝缘层2,它们组成导电单元,所述导电单元至少设置两个,在所述导电单元外部间隙设有填充3,它们组成缆芯,在缆芯外部挤包设有内护套4,在所述内护套4外部间隔设有中性线芯和半导电填充条5,所述中性线芯包括中性线芯导体6,在所述中性线芯导体6外部挤包设有半导电层7,在所述中性线芯和半导电填充条5外部挤包设有外护套8;所述导体1和中性线芯导体6都采用镀锡铜绞线制成;所述绝缘层2采用交联聚乙烯或聚乙烯制成;所述填充3采用阻水绳制成;所述内护套4采用防水线性低密度聚乙烯制成,其厚度不小于2mm;所述半导电层7和半导电填充条5都采用低密度聚乙烯与导电炭黑制成;所述外护套8为交联型半导电套,其厚度大于3mm。本发明整体结构设置合理,绝缘层采用交联聚乙烯或聚乙烯制成,具有优良的电气绝缘性能,物理机械性能及防水性;采用阻水绳填充,将电缆填充圆整的同时,阻止外部环境中水分的侵入;内护套采用防水性能优良的线性低密度聚乙烯,厚度不小于2mm;半导电层及半导电填充条采用低密度聚乙烯与导电炭黑的混合物,其导电性能设计为略高于外护套,以保证通过中性线芯的雷电或其它故障电流顺利瞬间通过半导电层及外护套引入到大地之中,保护电缆运行及外界环境的安全;外护套采用交联型的半导电材料,以乙烯-醋酸乙烯酯为基料,添加导电炭黑,敏化剂等混合挤出后,采用辐照工艺进行交联,外护套挤出采用挤压式,填满所有中性线芯外的间隙,将中性线芯完全包裹,保护中性线芯在通电时瞬间将电流接入到大地,外护套具有半导电性、优良的物理机械性能及防水性,外护套的径向电阻率达到40Ω.m,抗张强度达到10N/mm2。
本发明提供了一种思路及方法,具体实现该技术方案的方法和途径很多,以上所述仅是本发明的优选实施方式,应当指出,对于本技术领域的普通技术人员来说,在不脱离本发明原理的前提下,还可以做出若干改进和润饰,这些改进和润饰也应视为本发明的保护范围,本实施例中未明确的各组成部分均可用现有技术加以实现。
Claims (7)
1.一种防雷直埋电缆,其特征在于:它包括导体(1),在所述导体(1)外部挤包设有绝缘层(2),它们组成导电单元,所述导电单元至少设置两个,在所述导电单元外部间隙设有填充(3),它们组成缆芯,在缆芯外部挤包设有内护套(4),在所述内护套(4)外部间隔设有中性线芯和半导电填充条(5),所述中性线芯包括中性线芯导体(6),在所述中性线芯导体(6)外部挤包设有半导电层(7),在所述中性线芯和半导电填充条(5)外部挤包设有外护套(8)。
2.根据权利要求1所述的防雷直埋电缆,其特征在于:所述导体(1)和中性线芯导体(6)都采用镀锡铜绞线制成。
3.根据权利要求1所述的防雷直埋电缆,其特征在于:所述绝缘层(2)采用交联聚乙烯或聚乙烯制成。
4.根据权利要求1所述的防雷直埋电缆,其特征在于:所述填充(3)采用阻水绳制成。
5.根据权利要求1所述的防雷直埋电缆,其特征在于:所述内护套(4)采用防水线性低密度聚乙烯制成,其厚度不小于2mm。
6.根据权利要求1所述的防雷直埋电缆,其特征在于:所述半导电层(7)和半导电填充条(5)都采用低密度聚乙烯与导电炭黑制成。
7.根据权利要求1所述的防雷直埋电缆,其特征在于:所述外护套(8)为交联型半导电套,其厚度大于3mm。
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CN201590288U (zh) * | 2009-11-25 | 2010-09-22 | 江苏金牛线缆集团有限公司 | 同心导体屏蔽电力电缆 |
CN202473303U (zh) * | 2012-03-23 | 2012-10-03 | 安徽天龙电器线缆集团有限公司 | 本安型防爆电路用控制电缆 |
CN104167243A (zh) * | 2014-09-03 | 2014-11-26 | 吴俊� | 通信基站用防雷击光电复合缆及其制造方法 |
CN208157098U (zh) * | 2018-05-09 | 2018-11-27 | 江苏宝安电缆有限公司 | 一种防雷直埋电缆 |
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Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
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CN201590288U (zh) * | 2009-11-25 | 2010-09-22 | 江苏金牛线缆集团有限公司 | 同心导体屏蔽电力电缆 |
CN202473303U (zh) * | 2012-03-23 | 2012-10-03 | 安徽天龙电器线缆集团有限公司 | 本安型防爆电路用控制电缆 |
CN104167243A (zh) * | 2014-09-03 | 2014-11-26 | 吴俊� | 通信基站用防雷击光电复合缆及其制造方法 |
CN208157098U (zh) * | 2018-05-09 | 2018-11-27 | 江苏宝安电缆有限公司 | 一种防雷直埋电缆 |
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