Internal and external shielding granulator Internal and external shielding cable material granulator

>Internal and external shielding granulator, internal and external shielding cable material granulator

Internal and external shielding cable material formula, peelable insulation shielding material for high-voltage rubber insulated cables, calculated based on component mass, its components are chlorinated Parts of polyethylene, parts acetylene, carbon black, parts graphite powder, parts antioxidant, parts organic peroxide, parts accelerator, parts coupling agent, parts magnesium oxide, stabilizer, parts methyl silicone oil, parts alkaline neutralizer, parts processing oil. The invention overcomes the technical problem that the existing technology cannot produce peelable insulating shielding materials for mining high-voltage rubber insulated cables. The material has excellent conductive properties, a volume resistivity of less than 100%, a tensile strength of 100% or more, and a peeling strength controlled to 100% or more. ℃ for long-term use. The internal and external shielding material granulator uses a granulation system, which cuts granules under heat and is then brought out by water flow. The particles are evenly cut and rounded without debris. The appearance of the particles is good and no wire drawing process is required. There is no need to worry about wire breakage during wire drawing and granulation. , reduce the labor of workers, internal and external shielding cable material granulator, mixer, elevator, double-wrist feeder, single-screw granulator, water ring granulator, centrifugal dehydrator, air-cooled extended vibrating screen, automatic weighing system, first-level cyclone separator, dosing System high mixer finished product silo Welcome to consult Internal and external shielding cable material granulator Internal and external shielding granulator Twin-screw granulator Cable material granulator
Cable shielding has two forms: non-metallic shielding and metal shielding. Which shielding form is used depends on the type of cable. For example, power cables are mainly used to shield and homogenize the electric field and carry short-circuit current, while communication cables need to shield electromagnetic fields to eliminate interference between cores and outside the cable. The shielding of power cables has both non-metallic shielding and metal shielding forms, which depend on the voltage level of the cable and the size of the short-circuit current. The metal shielding part also depends on the conductivity, thermal performance, structure and processing method of the metal material. Communication Cables are mostly metal shielded. Here is a brief introduction to the shielding structure and materials of cables. The role of shielding is to homogenize the electric field. The relative surface of a solid conductor is relatively smooth, and the distribution of the electric field is relatively uniform. Since the stranded conductive wire core is composed of multiple single wires, the electric field distribution at each point on the surface of the wire core is uneven. The radius of the single wire is inversely proportional to the field strength on its surface, which produces a multi-wire effect. The burrs and dust produced by the conductor due to processing cause tip discharge, and conductor shielding is also required. In order to make the electric field distribution on the surface of the conductor relatively uniform, only wrapping tape shielding and extruding the shielding layer can homogenize the electric field and eliminate these effects. The electric field of the conductive core is divided into two components, perpendicular and tangential. If there is no semi-conductive layer, wrap-type insulation is prone to slip discharge. In addition, the field strength in the tangential direction reduces the withstand voltage of the insulation by 10 times, reducing the insulation strength and insulation effect. There is an electric field at the filling point of multi-core cables. Since the electrical strength of the insulating material at the filling location is low, the overall insulation level of the cable is reduced. Semiconducting materials are mainly composed of part of carbon black. In addition to being semiconductive, carbon black can also absorb gas impurities, which reduces the long-term electric field strength of the insulation on the corresponding surface, avoids dissociation on the outer surface of the cable insulation, and improves the service life of the cable. . In order to avoid excessive concentration of the electric field, a semiconducting layer structure is often used to change the direction of the electric field to avoid slipping discharge caused by wrapping the insulation, so that the filling of multi-core cables is in an electric field-free state. The carbon black in the semiconducting layer can absorb gas impurities. Shielding bubbles are not affected by electric fields. For stranded conductors, since they are made of multiple single wires glued together, the electric field intensity of the single wires protruding from the surface can be increased compared with the recessed parts. Less interference We all know that the electric field and the magnetic field are a unity that changes interactively. The changing electric field produces a changing magnetic field that affects the surrounding media, thereby causing interference to other current-carrying circuits. The effect of the electromagnetic field is the sum of the interference effects of the electric field and the magnetic field. . Electrical interference and magnetic interference caused by the imbalance between current pairs under the action of electric fields and magnetic fields. The generation of interference can be divided into inductance, capacitance and resistance, which produce corresponding inductive reactance, capacitive reactance and impedance in the loop, resulting in corresponding losses.
The frequency of communication cables is higher and it is easier to cause interference. The frequency of power cables is lower and it is easier to cause losses.
Adopting a reasonable shielding structure and effective grounding method can reduce interference and loss. Because the conductor has better electrical conductivity, the shield has less resistance to the current flowing through it, so the conductivity is higher. Insulators have high insulation properties and high resistance to current. It is almost impossible for current to penetrate the insulator, so the insulation resistivity is high. Materials with high electrical conductivity also have relatively high thermal conductivity. Materials with high insulation properties must have high thermal resistance. Different electrical conductivity properties also have different thermal conductivity properties. The electrical and thermal conductivity properties of semi-conductive materials Between conductors and insulators. If a short circuit occurs in a power cable and a large current flows through the conductor, causing the temperature to rise suddenly, the use of an internal semi-conductive shielding layer prevents excessive temperature from directly acting on the insulating layer, preventing damage to the insulating layer due to thermal shock. , in this case, the inner shielding layer acts as a heat shield and can also be called a thermal buffer layer. Wrapping or extruding a layer of metal shielding on the surface of the insulating or semi-conductive shielding not only eliminates the electric field at the filling point of the round conductor cable, but also because the metal shielding has good heat dissipation effect, in the event of an accidental short circuit
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