Bowen: A look at the five categories of power cables

A glance at the five major categories of power cables 1. According to the voltage level classification: China's cable products voltage levels are: 0.6 / 1,1 / 1,3.6 / 6,6 / 6,6 / 10,8.7 / 10,8.7 / 15,12 / 15,12 / 20,18 / 20,18 / 30, 21/35, 26/35, 36/63, 48/63, 64/110, 127/220, 190/330, 290/550 kV. Cable can also be divided into: Low voltage power cable (1kV); Medium voltage power cable (6 ~ 35kV); High voltage power cable (60 ~ 500kV). According to the conductive core cross-sectional area classification: China's power cable nominal cross-sectional area of ​​series: 250, 1000, 1200, 1400, 1600, 1800, 2000mm2, a total of 26 species. High-pressure oil-filled cable nominal cross-sectional area series: 10, 240, 300, 400, 500, 630, 800, 1000, 1200, 1600 and 2000 mm2. 3. According to the number of wires core classification: Power cable core has a single core, two cores, three cores, four cores, five cores, a total of 5 species. Single-core cable is usually used to transmit single-phase AC, DC. Two-core cable used to send single-phase AC or DC. Three-core cable is mainly used in three-phase AC power grid, widely used in various cable lines of 35kV and below. Four-core and five-core cables are mostly used for low-voltage distribution lines. Only the voltage level of lkV cable only two cores, four cores and five cores. 4. According to the insulation material classification: (1) Oil-impregnated paper insulated power cables 1) Ordinary adhesive impregnated paper insulated cables. 2) drip dry insulated cable. 3) Do not trickle dip cable. (2) plastic insulated cables (3) rubber insulated cables (4) flame-retardant PVC insulated cables (5) fire-resistant power cable 5. According to the structural characteristics of classification: ▲ overall package type: insulated core into a cable, the package outside the package insulation, and placed in the same inner jacket. ▲ sub-phase type: refers to the phase mask. 10KV plastic insulated cables are more than phase-type. ▲ pipe type: a steel pipe sheathing cable. ▲ flat type: three cables "one" word lined up, the appearance was flat. Generally used for long-distance submarine cable. ▲ self-capacity: jacket under pressure in the cable. Divided into self-contained oil-filled, inflatable cable. Power cable basic components: The basic structure of the cable consists of three parts: Conductive core for transmitting electrical energy; ● Insulation layer, to ensure the transmission of electrical energy along the conductive core, electrically isolating the conductive core from the outside; ● Protective layer, play a protective seal, so that the insulation layer from the outside moisture infiltration, from external damage, maintain insulation. Some cable plus shield. Multi-core cable insulation between the core, but also increase the filler and filler.