The Most Important Knowledge for Wire And Cable

1. Product definition

Wire and cable refer to the wire products used to transmit the electric energy information and realize the electromagnetic energy conversion.

Wire: usually only the metal conductor products and on the conductor with insulation layer plus light protection (such as cotton yarn woven layer, glass wire woven layer, plastic, rubber, etc.), simple structure, outer diameter is relatively small, the use of voltage and current is relatively small insulation wire, called wire.

Cable: the conductor and insulation layer, sometimes also add to prevent the tight inner layer to prevent water intrusion, or also add mechanical strength of the outer layer, the structure is more complex, the cross-sectional area of the product is called cable.

2. Basic composition

Wire and cable are composed of conductor (conductor), insulation layer, shield, insulation wire core, protective layer and other basic parts. Wires and cables according to different needs are composed of some or all of the above components.

3. main application

Power supply; transmission and distribution; motor, electrical and electrical instruments for electromagnetic energy conversion; measuring electrical parameters and physical parameters; transmitting signals, information and control; for sharing antenna TV or cable TV systems; feeder lines or connecting lines for radio frequency communication and test equipment.

4. Performance of the wire and cable

Wire and cable products are used in different occasions, so the performance requirements are multifaceted, very extensive. On the whole, the main performances are as follows:

1. Electric performance

Conductivity- -Most products require good conductivity, and individual products require a certain range of resistance.

Electrical insulation performance- -insulation resistance, dielectric coefficient, dielectric loss, electrical resistance characteristics, etc.

Transmission characteristics- -refers to the high-frequency transmission characteristics, anti-interference characteristics, etc.

2. Mechanical properties

Refers to the tensile strength, elongation, bending ability, elasticity, flexibility, vibration resistance, wear resistance and mechanical impact resistance, etc.

3. Thermal performance

Refers to the temperature resistance grade of the product, working temperature heating and heat dissipation characteristics of wires and cables for power transmission, carrying rate, short circuit and overload capacity, thermal deformation and heat impact resistance of synthetic materials, thermal expansion of materials and the dropping performance of impregnated or coating materials, etc.

4. Corrosion resistance and climate resistance

Refers to electrochemical corrosion resistance, biological and bacterial erosion resistance, chemical drug resistance (oil, acid, alkali, chemical solvent, etc.) erosion resistance, salt spray resistance, light resistance, cold resistance, mildew resistance and moisture-proof performance, etc.

5. Aging performance

Refers to the ability of the product and its constituent materials to maintain its original properties under the action of mechanical stress, electrical stress, thermal stress and other external factors, or under the action of external climatic conditions.

6. Other performance

It includes the characteristics of some materials (such as the hardness of metal materials, creep, the compatibility of polymer materials) and some special use characteristics of the product (such as non-flame retardant, atomic radiation resistance, insect bite resistance, delayed transmission, and energy damping, etc.).

The performance requirements of the product are mainly put forward from the use of each specific product, the use conditions, and the matching relationship of the supporting equipment. In the performance requirements of a product, there must be some of the main, play a decisive role, should be strict requirements. Some are subordinate. Sometimes some factors are mutually restrictive. Therefore, a comprehensive research and analysis must be considered comprehensively.