GB/T 30550-2014 in English

《GB/T 30550-2014含有一个或多个间隙的同心绞架空导线》由TC422（全国裸电线标准化技术委员会）归口，主管部门为中国电器工业协会。
本标准规定了含有一个或多个铝线或铝合金线的自承式绞层的同心绞架空导线(见图1)的电气和机械性能。该导线由下述任意的金属单线组合而成:
a) 符合GB/T17048―2009的硬铝线,命名为LY9,简写为L;
b) 符合GB/T23308―2009的铝-镁-硅系合金圆线,命名为LHA1或LHA2;
c) 符合GB/T30551―2014的耐热铝合金线,命名为NRLH1、NRLH2、NRLH3、NRLH4;
d) 符合IEC60888:1987的1级强度镀锌钢线,命名为G1A 或G1B;
e) 符合IEC60888:1987的2级强度镀锌钢线,命名为G2A 或G2B;
f) 符合IEC60888:1987的3级强度镀锌钢线,命名为G3A;
g) 符合IEC61232:1993的铝包钢线,命名为LB20A、LB27、LB30或LB40。
注:本标准包括自阻尼导线和间隙型导线的结构,虽然两种导线拥有相同的结构特点,在绞层与绞层之间都有一个
或多个间隙存在,但它们是为不同的用途设计的。自阻尼导线包含一个或多个间隙是为了增加自阻尼,而间隙型导线的间隙是为了安装的时候铝线层能在中心线芯上自由滑动,因此间隙数不超过一个。
本标准适用于表1规定的各种金属组合的含有一个或多个铝线或铝合金线绞层的同心绞架空导线。

Scope

This standard specifies the electrical and mechanical properties of concentric stranded overhead conductors (see Figure 1) containing one or more self-supporting strands of aluminum or aluminum alloy wires. The wire is composed of any metal single wire as follows: a) duralumin wire conforming to GB/T 17048-2009, named LY9, abbreviated as L; b) aluminum-magnesium-silicon conforming to GB/T 23308-2009 Alloy round wire, named LHA1 or LHA2; c) heat-resistant aluminum alloy wire in accordance with GB/T 30551-2014, named NRLH1, NRLH2, NRLH3, NRLH4; d) Class 1 strength galvanized in accordance with IEC 60888:1987 steel wire, designated G1A or GIB; e) galvanized steel wire of strength class 2 according to IEC 60888:1987, designated G2A or G2B; f) galvanized steel wire of strength class 3 according to IEC 60888:1987, designated G3A ;g) Aluminum-clad steel wire in accordance with IEC 61232:1993, named LB20A, LB27, LB30 or LB40. This standard applies to concentrically stranded overhead conductors containing one or more stranded layers of aluminum or aluminum alloy wires of the various metal combinations specified in Table 1.