Wire and cable introduction and common sense

2017-03-29

What are the types of cables that are usually made up of? 

       1, use code: not marked as power cable, K for the control cable, p for the signal cable; 2, insulation code: Z Oil impregnated paper, X rubber, V-poly chloro ethyl Dilute, YJ cross-linked polyethylene 3, conductor material code: not labeled Copper, l for aluminum; 4, inner layer code: Q Lead package, L aluminum package, H rubber sleeve, V-PVC thin sheath 5, derivation code: D does not drip, p dry insulation; 6, outer layer code: v-Poly-chloro-ethyl

       7, special Product code: TH damp Heat belt, ta dry tropics; 8, rated voltage: unit KV in the selection of power cable section, what provisions should be followed?

 

       (1) The rated voltage of the cable is greater than or equal to the rated voltage of the installation point power system; (2) The continuous allowable current of the cable shall be equal to or greater than the maximum continuous current of the supply load; (3) The wire core section to meet the power supply system short-circuit stability requirements, (4) According to the cable length check whether the voltage drop meet the requirements; (5) The minimum short-circuit current at the end of the line should be able to make the protective device reliable. 

       Explanation of several wires and cables 1, flame retardant wire and cable flame retardant is to block, delay the flame along the spread of wire and cable, so that the fire does not expand, the type of cable after the fire has its own performance. Flame-Retardant cable According to the National Experimental Standard (Gb1266) can be divided into three grades: Zra, ZRB, ZRC; in the general product nomenclature, Zra is usually used to indicate a high flame retardant cable or an oxygen-isolating layer cable or a high flame retardant insulation cable. 

 

       ZRC in the general flame-retardant products to indicate ZR.  

       2, fire-resistant wire and cable fire resistance refers to the flame in the case of a certain amount of time to maintain the operation, that is, to maintain the integrity of the circuit, the type of cable in the flame has a certain amount of time power supply. Fire-resistant cable According to the National Experimental Standard (Gb1266) can be divided into two grades: NHA, NHB; in the general product nomenclature, NHA is usually expressed in GNH, which is called high fire-resistant cable. 

 

       NHB is expressed as NH in general refractory products. 

       3, low smoke and halogen-free wire and cable low smoke refers to wire and cable combustion is produced by less smoke, that is, high transmittance; no halogen refers to the formation of wire and cable material does not contain halogen number (chlorine, bromine, etc.), combustion products are less corrosive. 

 

       Because the low smoke halogen-free wire and cable use to the environment is very small, some places called clean cable or environmental protection cable; As the country has so far no uniform naming of the product, the production enterprises in the formulation of enterprise standards on the products of different models, in my company expressed as Wl-Yje, Wl Yje23; the possible models are Wd-Yje, Dw Yje, Yyjs, Yje. 4, mineral insulated cable mineral insulated cable referred to as MI cable, also known as magnesium oxide insulated cable, it is composed of metal wire core, Magnesia insulating layer and metal sheath; The general model is expressed as BTT, Bttz, Q Light, and Z for heavy duty.

 

       Because mineral insulated cable is made of inorganic materials, it has the advantages of fire-resistant, explosion-proof, waterproof, corrosion-resistant, safe and reliable. Product Description 1, flame retardant characteristics Zr--general flame retardant Zra--A type flame retardant Zrb--b type flame Retardant ZRC-C class flame retardant 2, the use of cable K--control cable-Cloth Wire Class DJ (j)--Computer cable 3, insulation-PVC Y--W polyethylene YJ

       --crosslinked polyethylene-fluorine plastic gigabytes silicone rubber 4, conductor material T--copper conductor-aluminum conductor kx, EX, SC, KC, JX, Tx--compensating conductor alloy wire 5, sheathed-PVC Y--W Polyethylene-fluorine plastic gigabytes silicone rubber 6, conductor structure

       -Soft Structure (5th, 6 kinds of conductors) 1th, 2 kinds of conductors can omit not to write 7, shielded-copper wire braided shielded P1--B tin Braid shielded P2 cu tape wrapped shield P3 (PL)--aluminum foil wrapped shield 8, armored layer 22-2 steel Tape armored PVC sheathed 23 Steel Tape Armored polyethylene sheathed $number fine steel wire armored PVC sheathed 33 Fine steel Wire armored polyethylene sheathed –– coarse steel wire armored PVC sheathed 43--coarse steel wire armored polyethylene sheath about cable model 1. SYV: Solid polyethylene insulated RF coaxial cable 2, Sywv (y): Physical foaming polyethylene B Insulated cable TV system cable, video (RF) coaxial cable (SYV, SYWV, SYFV) appropriate For closed-circuit monitoring and cable TV engineering Sywv (y), SYKV cable TV, broadband network special cable structure: (coaxial cable) single root oxygen-free round copper wire + physical Foaming Polyethylene (insulated) + (tin + aluminum) + polyvinyl chloride (polyethylene) 3, Signal control cable (rvv sheath line, RVVP shielding line) applicable to building intercom, anti-theft alarm, fire, automatic meter reading and other projects RVVP: Copper conductor PVC Insulated shielded PVC sheathed soft cable voltage 300v 300v 2-24-Core use: instrumentation, instrumentation, intercom, monitoring, control installation 4, RG: Physical foaming polyethylene insulated access network cable for coaxial fiber hybrid network (HFC) transmission data analog signal 5, KVV: PVC sheathed Braided Shielded cable uses: signal transmission, control, Measurement 6, rvv (227IEC) PVC insulated flexible cable for electrical, instrumentation and distribution devices: household appliances, small power tools, instrumentation and power lighting 7, AVVR chloride Soft cable for installation of ethylene sheath 8, SBVV Hya data communication cable (indoors, outside) for telephone communication and radio equipment connection and telephone wiring network of wire box wiring 9, RV, RVP PVC insulated Cable 10, RVs, RVB suitable for household appliances, small electric tools, instruments, meters and power lighting connection cable 11, BV, BVR PVC insulated cable uses: for electrical instrumentation equipment and power lighting fixed wiring with 12, rib speaker Connection line (fever line) 13, KVV PVC insulated control cable use: Electrical, instrumentation, distribution equipment signal transmission, control, measurement 14, SFTP twisted pair transmission telephone, data and information Network 15, UL2464 computer connection line 16, VGA monitor line 17, SYV coaxial cable wireless communication, broadcasting, monitoring system engineering and related electronic equipment transmission of RF signal (including integrated coaxial cable) 18, SDFAVP, SDFAVV P, Syfpy coaxial cable, elevator special 19, JVPV, JVPVP, JVIP copper conductor PVC insulated and sheathed copper wire woven computer control cable wire and cable application is divided into three major categories 1, electric power system electric power system used wire and cable products are mainly overhead bare wires, busbar (bus), power cable (plastic cable, oil paper power cable () is basically replaced by plastic power cables), rubber sheath cable, aerial insulated cable, branch cable (replace part bus),

       Electromagnetic wire and power equipment, electrical and gas equipment, wire and cable.

       2, information transmission system used in information transmission system of wire and cable mainly include local telephone cable, TV cable, electronic cable, RF cable, fiber cable, data cable, electromagnetic wire, power communication or other composite cable.

 

       3, mechanical equipment, instrumentation system This part in addition to the aerial bare wires almost all other products have applications, but mainly power cables, electromagnetic wire, data cables, instrumentation cables and so on.

       Wire and cable products are mainly divided into five categories 1, bare wires and bare conductor products of this type of products are mainly characterized by: pure conductor metal, no insulation and sheath layer, such as steel core aluminum stranded wire, copper and aluminum confluence platoon, electric locomotive line, etc. processing technology is mainly pressure processing, such as smelting, calendering, drawing, twisting/clamping, etc. products are mainly used in the suburbs, rural areas, user main line, switch cabinets and so on. 2. The main features of this type of power cable are: to squeeze (around) an insulating layer, such as an overhead insulated cable, or a few cores (corresponding to the phase, 0, and ground) of the power system, such as an overhead insulated cable above the two cores, or an additional sheath layer, such as a plastic/rubber sheathed wire and cable.

       The main technology has pull, twisted, insulated extrusion (around the package), cable, armored, layer extrusion, etc., a variety of products different process combinations have a certain difference.

       Products are mainly used in hair, distribution, transmission, change, power supply line in the strong electric power transmission, through the current large (dozens of to thousands of Ann), High voltage (220V to 500kV and above).

       3, electrical and equipment wire and cable The main characteristics of the products are: variety specifications, wide range of application, the use of voltage in 1kV and more, in the face of special occasions constantly derived new products, such as fire-resistant cable, flame-retardant cable, low smoke halogen/low smoke and low halogen cable, termite-proof, mouse-resistant cable, oil/cold/temperature/wear-resistant cable, medical/agricultural/mining cables, thin-walled wire, etc. 4, communication cables and optical fiber (brief introduction) with the past more than 20 years, the rapid development of the communications industry, products also have an astonishing development speed.

       From the simple telephone telegraph cables of the past to thousands of pairs of cables, coaxial cables, optical cables, data cables, and even a combination of communication cables.

       The structure size of the product is usually small and uniform, and the manufacturing precision is high.

 

       5, electromagnetic wire (winding line) is mainly used in a variety of motors, instrumentation and so on.

       Derivative of wire and cable/new product wire and cable derivative/new products are mainly due to applications, application requirements for different and equipment convenience and reduce equipment costs, and the use of new materials, special materials, or change the product structure, or improve the process requirements, or the combination of different varieties of products produced.

       The use of different materials such as flame-retardant cable, low smoke halogen/low smoke low halogen cable, anti-termite, mouse cable, oil/cold/temperature-resistant cable, etc. change the product structure such as: fire-resistant cable, improve the process requirements such as: medical cable, etc., combination of products such as: OPGW, easy to install and reduce equipment costs such as: Prefabricated branch cable.

 

       Wire and cable is a kind of product that transmits electromagnetic energy, information and realizes the conversion of electromagnetic energy. The broad sense of wire and cable is referred to as cable.


       A narrow cable is an insulated cable, which is made up of one or more insulated cores and the protective layers they may have.

       China's wire and cable products by use generally divided into five categories.

       1, bare wire refers to the only conductor, no insulating layer of products. 2, the winding line (also known as the electromagnetic wire) is generally used in the form of coils. The main function is to realize the conversion between electricity and magnetic energy.

       According to the characteristics can be divided into enameled wire, wrap line, inorganic insulation line and so on.

       3, power cable in the power system for transmission and distribution of high-power power cable products.

       4. A cable for transmitting data and information by means of a telecommunication (optical) cable.

 

       5, electrical equipment cable refers to a variety of electrical equipment, electrical power supply connection lines with wire and cable, a variety of industrial and agricultural equipment, electrical installation lines and control signals with wire and cable.

       Some of the cables are described as follows: first, fire-resistant wire and cable is a general term for fire-retardant wire and cable, usually divided into two kinds of fire-retarding wire and cable and fire-resistant wire and cable.

       1, flame-retardant wire and cable flame retardant refers to block, delay the flame along the spread of wire and cable, so that the fire does not expand, the type of cable after the fire has a self quenching performance. Flame-Retardant cable According to the National Experimental Standard (Gb1266) can be divided into three grades: Zra, ZRB, ZRC; in the general product nomenclature, Zra is usually used to indicate a high flame retardant cable or an oxygen-isolating layer cable or a high flame retardant insulation cable.

       ZRC in the general flame-retardant products to indicate ZR.

       2, fire-resistant wire and cable fire resistance refers to the flame in the case of a certain amount of time to maintain the operation, that is, to maintain the integrity of the circuit, the type of cable in the flame has a certain amount of time power supply. Fire-resistant cable According to the National Experimental Standard (Gb1266) can be divided into two grades: NHA, NHB; in the general product nomenclature, NHA is usually expressed in GNH, which is called high fire-resistant cable.

       NHB is expressed as NH in general refractory products.

       3, low smoke and halogen-free wire and cable low smoke refers to wire and cable combustion is produced by less smoke, that is, high transmittance; no halogen refers to the formation of wire and cable material does not contain halogen number (chlorine, bromine, etc.), combustion products are less corrosive.

       Because the low smoke halogen-free wire and cable use to the environment is very small, some places called clean cable or environmental protection cable; As the country has so far no uniform naming of the product, the production enterprises in the formulation of enterprise standards on the products of different models, in my company expressed as Wl-Yje, Wl Yje23; the possible models are Wd-Yje, Dw Yje, Yyjs, Yje. 4, mineral insulated cable mineral insulated cable referred to as MI cable, also known as magnesium oxide insulated cable, it is composed of metal wire core, Magnesia insulating layer and metal sheath; The general model is expressed as BTT, Bttz, Q Light, and Z for heavy duty.

 

       Because mineral insulated cable is made of inorganic materials, it has the advantages of fire-resistant, explosion-proof, waterproof, corrosion-resistant, safe and reliable.

       XLPE Insulated cable Xlpe cables are divided into two types: physical crosslinking and chemical crosslinking. 1, chemical crosslinking has silane crosslinking and peroxide crosslinking two. Silane crosslinking is used to call warm water cross-linking, generally used for 1kV and below Low-voltage cable and 10kV and below aerial cable; According to the production process can be divided into one-step and two-step. One-step means that all raw materials are extruded together in the extruder, two step refers to raw material processing and the two materials of the material, in the production of the two materials after a certain proportion of mixing in the extruder extrusion.

       One-step XLPE cable Some manufacturers expressed as M Yjov. 2, physical crosslinking for irradiation crosslinking, generally used for 1kV and below cable and 10kV and the following small section of High-voltage cable. In fact, the warm water crosslinking and irradiation crosslinking only in the production of the use of different processing methods, cable performance is basically the same, there is no difference in the use of. The model is generally expressed as Yjv or YYHFV.


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