Electric cable market is really a manufacturing company of simple gear and fundamental product. Which is described as the "blood vessels" and "nerve" in the national economy, it really is used for transmitting information and electricity and is indispensable to the electrification in the future, cable business can be a massive and supporting business, goods must meet the needs in the primary business, the improvement of principal sector will promoted the improvement of cable market.
1、What is Electric Cable?
Cable is really
a sort of wire goods what is composed of a number of or a number of groups of
conductors twisted into a rope, every group of wires is insulated, and
frequently revolve around a center rope, all of these are covered using a very
insulating layer. Wire and cable is utilized in electric power, communication
and media related transmission purposes.
The fundamental
structure of cable consists of 4 components: core, insulation, shielding layer
and protective layer
(1) wire core
wire core is conductive part of cable, which
is employed for conveying power, would be the main part of the energy cable.
(2) the
insulation
Insulation
insulates the core、the earth and
also the different phase of wire core from one another, assure the electric
power transmission, it's an integral part of cable structure.
(3) shielding
layer
the 15 kv and
above have conductor shielding layer as well as the insulating shield generally
.
(4) the function
on the protective cover
protective cover is utilized to safeguard the
power cable in the the invasion in the impurities and moisture, and prevent the
external force harm the energy cable straight.
3、Different Classification According to Different
Forms
1) in line with
the present form: communication cable, direct existing cable; 2) according to
the installation location: Overhead Power Cable, underground cable(Could be laid
at indoor, tunnel and tube .Cable can't beneath take mechanism outside force),
submarine cable (across the river,submarine cable). 3) in accordance with the
conductivity of wire core: ordinary cable, cryogenic and superconducting cable;
4) in accordance with the amount of conductive wire: single core wire(many
kinds including Single core rigid conductor nonsheathed cable、Copper core PVC insulated wire））and multicore cable for example 2 core
wire, 3 core wire, 4 core wire, five, six core wire and above,what are
appropriate for the wiring of electrical controlling equipments and
instrument,monitoring and controlling return circuit. 5) In accordance with the
insulation supplies, might be divided into the oil impregnated paper insulating
energy cable, plastic insulated energy cables, rubber insulated power cable,
for the plastic insulated energy cables,, the typically utilized plastic cable
is polyethylene, crosslinked polyethylene and Pvc
Insulation Wire. Plastic cable structure is easy and
easy to manufacture, simultaneously, together with the characteristic of light
weight, straightforward installation. Therefore it's extensively applied in
medium and low voltage cable, although its greatest drawback may be the
phenomenon of dendronized breakdown , which limits the use for higher voltage.
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