導體屏蔽層（也稱內屏蔽層、內半導電層）
Conductor shielding layer (also called internal shield layer, inner semi conductive layer)
①導體屏蔽層是擠包在電纜導體上的非金屬層，與導體等電位，體積電阻率為100~1000Ω•m。與導體等電位。
(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.
②一般情況3kV及以下低壓電纜沒有導體屏蔽層，6kV及以上的中高壓電纜都必須有導體屏蔽層。
(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導體屏蔽層主要作用：消除導體表面的坑洼不平；消除導體表面的尖端效應；消除導體與絕緣之間的孔隙；使導體與絕緣之間緊密的接觸；改善導體周邊的電場分布；對于交聯電纜導體屏蔽層還具有抑制電樹生長和熱屏蔽作用。
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.
絕緣層（也稱主絕緣）
Insulating layer (also known as main insulation)
①電纜主絕緣具有耐受系統電壓的特定功能，在電纜使用壽命周期內，要長期承受額定電壓和系統故障時的過電壓，雷電沖擊電壓，保證在工作發熱狀態下不發生相對地或相間的擊穿短路。因此主絕緣材料是電纜的質量關鍵。
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交聯聚乙烯是一種良好的絕緣材料，現在得到廣泛的應用,其顏色為青白色半透明。其特性是：較高的絕緣電阻；能夠耐受較高的工頻、脈沖電場擊穿強度；較低的介質損失角正切值；化學性能穩定；耐熱性能好，長期允許運行溫度90℃；良好的機械性能，易于加工和工藝處理。
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.
絕緣屏蔽層（也稱外屏蔽層、外半導電層）
Insulation shielding layer (also known as outer shielding layer, outer semi conductive layer)
①絕緣屏蔽層是擠包在電纜主絕緣上的非金屬層，其材料也是交聯材料，具有半導電的性質，體積電阻率為500~1000Ω•m。與接地保護等電位。
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.
②一般情況3kV及以下低壓電纜沒有絕緣屏蔽層，6kV及以上的中高壓電纜都必須有絕緣屏蔽層。JBYH電機引接線 電壓500V 3000V高壓電機引接線
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絕緣屏蔽層的作用：電纜主絕緣與接地金屬屏蔽之間的過渡，使之有緊密的接觸，消除絕緣與接地導體之間的孔隙；消除接地銅帶表面的尖端效應；改善絕緣表面周邊的電場分布。JBYH電機引接線 電壓500V 3000V高壓電機引接線
(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電機引接線 電壓500V 3000V高壓電機引接線
④絕緣屏蔽按照工藝分為可剝離型和不可剝離型，一般中壓電纜，35kV及以下采用可剝離型，好的可剝離絕緣屏蔽具有良好的附著力，剝離后沒有半導電顆粒殘留。110kV及以上采用不可剝離型。不可剝離型屏蔽層與主絕緣的結合更緊密，施工工藝要求更高。
(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.
