导体屏蔽层（也称内屏蔽层、内半导电层）
Conductor shielding layer (also called internal shield layer, inner semi conductive layer)
①导体屏蔽层是挤包在电缆导体上的非金属层，与导体等电位，体积电阻率为100~1000Ω•m。与导体等电位。
(1) the shielding layer of the conductor is a non metal layer packed on the conductor of the cable and is equal to the conductor. The volume resistivity is 100~1000 Omega m. Conductor equipotential.
②一般情况3kV及以下低压电缆没有导体屏蔽层，6kV及以上的中高压电缆都必须有导体屏蔽层。
(2) the general situation 3kV and below low voltage cable have no conductor shielding layer, and the middle and high voltage cables of 6kV and above must have conductor shielding layer.
③导体屏蔽层主要作用：消除导体表面的坑洼不平；消除导体表面的尖端效应；消除导体与绝缘之间的孔隙；使导体与绝缘之间紧密的接触；改善导体周边的电场分布；对于交联电缆导体屏蔽层还具有抑制电树生长和热屏蔽作用。
The conductor shielding layer main function: eliminate the conductor surface uneven; eliminate the tip effect of conductor surface between the conductor and the insulation; eliminate pores; tightly contact between the conductor and the insulation; improve the electric field around the conductor; inhibit the electrical tree growth and heat shielding effect for XLPE cable conductor shielding layer.
绝缘层（也称主绝缘）
Insulating layer (also known as main insulation)
①电缆主绝缘具有耐受系统电压的特定功能，在电缆使用寿命周期内，要长期承受额定电压和系统故障时的过电压，雷电冲击电压，保证在工作发热状态下不发生相对地或相间的击穿短路。因此主绝缘材料是电缆的质量关键。
The main insulation of the cable has the specific function of the system voltage. During the life cycle of the cable, it is necessary to withstand the rated voltage and the over-voltage of the system fault for a long time, and the lightning impulse voltage can ensure that there is no relative or interphase breakdown short circuit in the working heat condition. Therefore, the main insulation material is the key to the quality of the cable.
②交联聚乙烯是一种良好的绝缘材料，现在得到广泛的应用,其颜色为青白色半透明。其特性是：较高的绝缘电阻；能够耐受较高的工频、脉冲电场击穿强度；较低的介质损失角正切值；化学性能稳定；耐热性能好，长期允许运行温度90℃；良好的机械性能，易于加工和工艺处理。
Cross linking polyethylene is a good insulating material, and now it has been widely used. Its color is greenish white and translucent. Its characteristics are: high insulating resistance; can withstand higher frequency, pulsed electric breakdown strength; low dielectric loss tangent; chemical stability; good heat resistance, long-term permissible operating temperature of 90 DEG C; good mechanical properties, easy processing and processing technology.
绝缘屏蔽层（也称外屏蔽层、外半导电层）
Insulation shielding layer (also known as outer shielding layer, outer semi conductive layer)
①绝缘屏蔽层是挤包在电缆主绝缘上的非金属层，其材料也是交联材料，具有半导电的性质，体积电阻率为500~1000Ω•m。与接地保护等电位。
The insulating shielding layer is a non metallic layer which is extruded on the main insulation of the cable, and the material is also a cross linking material. It has semi conductive property and the volume resistivity is 500~1000 ohm M. And earthing protection equipotential.
②一般情况3kV及以下低压电缆没有绝缘屏蔽层，6kV及以上的中高压电缆都必须有绝缘屏蔽层。JBYH电机引接线 电压500V 3000V高压电机引接线
In general, 3kV and below low-voltage cables have no insulation shielding layer, and 6kV and above medium and high voltage cables must have insulation shielding layer.
③绝缘屏蔽层的作用：电缆主绝缘与接地金属屏蔽之间的过渡，使之有紧密的接触，消除绝缘与接地导体之间的孔隙；消除接地铜带表面的尖端效应；改善绝缘表面周边的电场分布。JBYH电机引接线 电压500V 3000V高压电机引接线
(3) the role of insulating shielding layer: the transition between cable main insulation and grounding metal shield brings close contact, eliminates the gap between insulation and grounding conductor, eliminates the tip effect on the surface of grounding copper strip, and improves the electric field distribution around the insulation surface.JBYH电机引接线 电压500V 3000V高压电机引接线
④绝缘屏蔽按照工艺分为可剥离型和不可剥离型，一般中压电缆，35kV及以下采用可剥离型，好的可剥离绝缘屏蔽具有良好的附着力，剥离后没有半导电颗粒残留。110kV及以上采用不可剥离型。不可剥离型屏蔽层与主绝缘的结合更紧密，施工工艺要求更高。
(4) the insulation shield can be divided into stripped and non peeling type according to the technology. The medium voltage cable, 35kV and below can be stripped. The good peeling insulation shield has good adhesion and no semi conductive particles are left after stripping. 110kV and above can not be stripped type. The ...bination of non stripping shielding layer and main insulation is more ...pact, and the construction process requirements are higher.
