What are the common low voltage cables? And how are their characteristics?

Low-voltage power cables are generally divided into its insulation type of PVC insulated (plastic) power cables, cross-linked polyethylene insulated power cables, rubber insulated power cables, oil-filled and oil-impregnated paper insulated power cables. According to the type and nature of work can be divided into general ordinary power cables, overhead power cables, underground mining power cables, submarine power cables, fire (resistant) flame retardant power cables and other types. In order to accurately indicate the use of the cable, the type of structure and name, the standard "cable outer layer" GB/T 2952-1989 provides for the use of pinyin letters and numbers combined to indicate the category and model of the cable.

-I. What are the common low voltage cables? And its characteristics are how? Copper conductor power cables: At present, the domestic low-voltage power cables are all core wire stranded together into a cable, this structure of the cable anti-interference ability is poor, the performance of anti-lightning strike is also poor, the cable's three-phase impedance imbalance and zero-sequence impedance is large, it is difficult to make the line to protect the appliance to act reliably, and so on. Cross-linked polyethylene insulated power cables: XLPE cable for short, it is the use of chemical or physical methods to make the cable insulation material polyethylene plastic molecules from the linear structure into a three-dimensional mesh structure, that is, the original thermoplastic polyethylene into a thermosetting crosslinked polyethylene plastic, which significantly improves the cable's heat-resistant properties and service life, and still maintain its excellent electrical properties. PVC insulated PVC sheathed power cables: PVC insulated PVC sheathed low-voltage power cables long-term operating temperature does not exceed 70 ℃, the higher temperature of the cable conductor does not exceed 160 ℃. The longest duration of short-circuit does not exceed 5s, and the lower temperature of construction and laying shall not be lower than 0℃.

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