對(duì)于單芯電纜來(lái)說(shuō)，在電纜的絕緣屏蔽層上繞包半導(dǎo)電阻水帶，在金屬屏蔽層外面繞包普通阻水帶，然后擠包外護(hù)套，外護(hù)套材料可以是普通的PVC，也可采用具有徑向阻水功能的HDPE材料等，可視電纜其它性能要求而定。對(duì)于三芯電纜，則為了保證金屬屏蔽的充分接觸，只在絕緣屏蔽外面繞包單導(dǎo)電阻水帶，金屬屏蔽外不再繞阻水帶，視防水性能要求的高低，填充可采用普通填充或阻水填充，內(nèi)襯層及外護(hù)套材料同單芯電纜中所述。
For single-core cables, in the cable insulation shield semi-conductive water blocking tape wrapped on the outside metal shield wrapped ordinary waterproof tape, and then extruded outer jacket,outer sheath material may be ordinary PVC may also be used HDPE material having a water-blocking function of the radial and the like, the visual properties of the cable other requirements. For three-core cable, the metal shield in order to ensure full access only outside wrapped in insulation shield a single conductive water blocking tape, metal shielding around the outside is no longer waterproof tape, waterproof performance requirements depending on the level of the ordinary can be filled or filled water blocking filling, inner liner and the outer jacket material of the same single cable.
在外護(hù)套或內(nèi)襯層的內(nèi)部縱包鋁塑復(fù)合帶層作為防水層，對(duì)于絕緣電纜來(lái)說(shuō)，則主要采用金屬護(hù)層使電纜達(dá)到防水要求，金屬護(hù)層的最大特點(diǎn)是具有完全不透過(guò)性，故具有金屬護(hù)套的電纜具有非常好的徑向阻水性能。
Liner inside the outer jacket or vertical bag plastic composite tape layer as a waterproof layer, for insulated cables, it is mainly a metal sheath of the cable reaches water requirements, the biggest feature is a metal sheath having a completely impermeable cable resistance, it has a metal sheath has a very good radial water blocking performance.
電纜的防水方式一般分為縱向阻水和徑向徑水兩種。縱向阻水一般常用的有阻水紗、阻水粉及阻水帶，它們的阻水機(jī)理是在這些材料中含有一種遇水可膨脹的材料，當(dāng)水份從電纜端頭或是從護(hù)套缺陷中進(jìn)入后，這種材料就會(huì)遇水迅速膨脹阻止水份沿電纜縱向進(jìn)一步擴(kuò)散，這樣就實(shí)現(xiàn)了電纜縱向防水的目的。
Waterproof cable diameter water way is generally divided into two watertight and radial. Watertight commonly used are water-blocking yarns, water blocking tape and water blocking powder, which contains a water-blocking mechanism is the water-swellable material in these materials, when the water from the sheath from the cable headend, or after entering the defects, the rapid expansion of this material will prevent water moisture further spread longitudinally along the cable, thus achieving a longitudinally watertight cable purposes.
