Introduction of Low Voltage Power Cable

Release time:

2021-08-19 09:10

A power cable is a conductor covered with an insulating layer, a protective layer, a shielding layer, or the like. Used to transmit power or signal current and signal voltage. According to the voltage can be divided into high voltage cable andLV power cable. Compared with low-voltage overhead lines and low-voltage overhead insulated lines, low-voltage cable lines are more expensive and more difficult to lay and maintain. However, due to their reliable operation, no rod, no land occupation, no obstruction of sight, and little influence from the outside world, they are widely used in low-voltage distribution systems. Low voltage power cable is composed of core, insulation layer and protective layer. The core is used to conduct current and is usually made of stranded copper or aluminum wire. Low voltage cables include single core, double core, three core and four core. Single-phase line adopts double-core cable, three-phase three-wire and three-phase four-wire respectively adopt three-core and four-core cable. Single core cables can be used for single-phase lines or three-phase lines as required.


Insulating material with specific withstand voltage function in low voltage power cable. The insulation layer is divided into core wire insulation and ribbon insulation: the insulation coated on the wire core is called core wire insulation; the insulated wire cores of multi-core cables are put together and then covered with insulation, which is called ribbon insulation. The belt insulation is separated from the protective layer to form a reliable ground insulation. The insulating layer is usually made of oil-impregnated paper, plastic, rubber, etc. Paper insulated cable is a cable impregnated with cable paper as the insulation layer, called paper insulated cable. According to the paper impregnation, it can be divided into: ① oil impregnated paper insulated cable; ② dry insulated cable; ③ dripless cable. The insulation layer of low-voltage power cable is extruded from thermoplastic and crosslinked cables are generally called plastic cables, which are widely used. Plastic cables can be divided into PVC cables, polyethylene cables and cross-linked polyethylene cables. The cable with natural styrene butadiene rubber, butyl rubber and ethylene propylene rubber as the insulation layer is called rubber cable. Low-voltage cables with voltage level below 1kV can use paper insulated cables and plastic cables, mostly plastic cables; low-voltage cables with voltage level of 0.5 kV are mostly rubber cables.
Yanggu Cable FactoryTell you, one or more layers of metal or non-metal covering on the outside of the low-voltage power cable. The protective layer is used to protect the insulating layer from external force damage and moisture intrusion during transportation, laying and use. Paper insulated cable protection layer. The protective layer of paper insulated cable is divided into inner protective layer and outer protective layer. The inner protective layer is directly extruded on the insulating layer, which not only protects the insulating layer from moisture, but also prevents the insulating oil from flowing out, and has a certain mechanical strength. There are three types of inner protective layers for low-voltage power cables: lead, aluminum and polyvinyl chloride. The outer sheath protects the inner sheath and increases the ability of the cable to withstand external mechanical forces and corrosion resistance. The outer protective layer includes an inner liner layer, a metal armor layer, and an outer cover layer. The inner lining layer protects the metal sheath from the damage of the metal armor layer and can increase anti-corrosion measures; the metal armor layer can withstand mechanical external forces; the outer coating can protect the armor metal from external corrosion.
Plastic cable protective layer for low voltage power cables. Plastic insulation is usually used outside the PVC sheath. Rubber cable protection layer. The protective layer of the rubber cable consists of an inner protective layer and an outer protective layer. There are three types of inner protective layers: PVC sheath, neoprene sheath (non-combustible rubber) and lead sheath; the outer sheath is divided into three types: steel tape armor, rubber sheath and plastic sheath. Want to know moreWire and cable for electrical equipment, Yanggu cableThe content, can pay attention to us.

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