Electric cable business is really a manufacturing organization of fundamental equipment and fundamental solution. That is described because the "blood vessels" and "nerve" in the national economy, it is utilized for transmitting data and electrical energy and is indispensable towards the electrification on the future, cable market is really a huge and supporting business, merchandise need to meet the specifications on the main sector, the improvement of principal market will promoted the development of cable industry.
1、What is Electric Cable?
Cable is a type
of wire merchandise what exactly is composed of numerous or many groups of
conductors twisted into a rope, every group of wires is insulated, and usually
revolve about a center rope, all of these are covered using a hugely insulating
layer. Wire and cable is used in electric energy, communication and media
connected transmission purposes.
The basic
structure of cable consists of four parts: core, insulation, shielding layer
and protective layer
(1) wire core
wire core is conductive a part of cable, which
can be utilised for conveying energy, is the main part of the energy cable.
(two) the
insulation
Insulation insulates
the core、the earth as
well as the various phase of wire core from each other, guarantee the electric
power transmission, it is an integral part of cable structure.
(three)
shielding layer
the 15 kv and
above have conductor shielding layer along with the insulating shield
frequently .
(4) the function
in the protective cover
protective cover is used to defend the energy
cable in the the invasion on the impurities and moisture, and stop the external
force damage the power cable directly.
3、Different Classification In accordance with Diverse
Types
1) based on the
present kind: communication cable, direct existing cable; 2) in accordance with
the installation place: Overhead Power Cable, underground cable(May be laid
at indoor, tunnel and tube .Cable can't beneath take mechanism outdoors force),
submarine cable (across the river,submarine cable). 3) in line with the
conductivity of wire core: ordinary cable, cryogenic and superconducting cable;
four) in accordance with the number of conductive wire: single core wire(many
types for example Single core rigid conductor nonsheathed cable、Copper core PVC insulated wire））and multicore cable like two core wire,
three core wire, four core wire, 5, six core wire and above,what are suitable
for the wiring of electrical controlling equipments and instrument,monitoring
and controlling return circuit. 5) Based on the insulation supplies, may be
divided in to the oil impregnated paper insulating power cable, plastic
insulated energy cables, rubber insulated energy cable, for the plastic
insulated power cables,, the commonly utilised plastic cable is polyethylene,
crosslinked polyethylene and Pvc
Insulation Wire. Plastic cable structure is
straightforward and easy to manufacture, simultaneously, using the
characteristic of light weight, straightforward installation. For that reason
it is broadly applied in medium and low voltage cable, although its biggest
drawback may be the phenomenon of dendronized breakdown , which limits the use
for greater voltage.
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