gui chao cable news: the role of wire and cable weaving
from：guichao author：admin click： 509 addtime：2017-04-24 16:55:15
wire and cable is mainly composed of conductive wire core,
the insulating layer and the jacket layer are composed of three basic structural elements
there is no strict limit to the difference between wire and cable,
but from a broad sense, the cable structure is more complex,
it has a complex sheath,
the wire structure is relatively simple, only the conductor and insulation,
there is only a thin layer of wax coated or covered with a light protective layer
the conductor core of electric wire and cable is used to transmit current
in order to reduce power loss and voltage drop,
conductive wire core is usually made of copper and aluminum with high conductivity
the function of the insulation layer is to prevent the leakage of current,
ensure safe use
so it is necessary to have good insulation performance
heat resistance and mechanical strength
the protective covering on the outside of the insulated wire core or cable core is called the protective layer of the cable
the protective covering outside the protective layer is called the outer covering
the main function of the protective layer is to protect the insulation layer
its main performance is moisture-proof, anti oil, anti-corrosion
sun aging, flame resistance, and mechanical protection
the function of the outer protective layer is to strengthen the mechanical protection of the cable,
has the electricity, anti dry antimagnetic effect
from the point of view of the wire and cable protective layer, weaving is one of many kinds of protective layer or outer protective layer of wire and cable
however, according to the material used in the wire and cable braiding layer and the braided layer in the different parts of the wire and cable structure,
the role of the braid layer is obviously different
the role of fiber braided layer
for wires, the fiber braid is a form of a light protective layer
its main function is to protect the insulation from or less affected by various light,
heat, moisture, low temperature, acid and alkali gases and other mechanical damage,
to ensure the safe operation of the wire,
fiber braided layer is often in the middle of the protective layer,
so as to enhance the anti tearing strength of the protective layer,
such as the strengthening of the jacket is in the middle of the rubber or plastic protective layer of cotton yarn,
hemp fiber braided layer to improve the strength of the protective layer
two, the role of metal braid
there are two kinds of metal braided layer: copper wire braided layer and steel wire (wire) braided layer,
the main role of copper wire braid:
l- shielding against electromagnetic interference such as tinned copper wire braided blue cable,
copper wire braided control cable
2 eliminate the shielding effect of the surface potential of power cable
it sets off the power line and eliminates inductive electricity, such as high voltage cable shielding
3 shielding function of safety protection
braided copper wire in the main insulation and good contact with the ground or ground wire,
timely response to leakage, such as shielding mine cable
the main role of wire braid:
l. mechanical protection. such as shipboard power cable type cf31
2 to withstand the longitudinal tensile force, such as the use of marine geological survey magnetic cable wc- gc, wct type
3 magnetic shielding.