The reason for ageing of cable

Wire and cable insulation aging is the most direct reason for lower breakdown.Guide min insulation lower mean a lot, according to the practical operation experience, is classified into the following several ways.

Anyte wire cable

1) the external force damage.Now quite a number of cable fault are caused by mechanical damage.Such as: non-standard cable laying installation construction, easy to cause mechanical damage;Sometimes if the injury is not serious, months or even years to lead to injury completely breakdown failure formation, sometimes destroyed fault may occur, directly affect the safety in production.
2) insulation be affected with damp be affected with damp.It is also very common.Such as: cable joint production of unqualified and do joint in humid climate conditions, can make the joint water or mixed with water vapor, time is long gradually damage the insulation of the cable strength and cause failure.
3) the chemical etching.Protective layer due to the long suffering chemical corrosion and electrochemical corrosion, the coating failure, the insulation is reduced, can also lead to cable fault.
4) long-term overload operation.Overload for a long time running, the high temperature will accelerate aging of the insulation, and insulation breakdown.Especially in hot summer, the temperature of the cable often resulted in the breakdown of cable insulation is weak at first, so in the summer, the failure of the cable is much more special.
But Anytekabel Co.,Ltd., the production of wire and cable, cable from the selection of raw materials or are strictly controlled in the process of production, control, makes every effort to do wire, cable, good let you rest assured brand!

Use requirement and structure characteristics of elevator cable

Using characteristics
1. the cable should be free hanging before use, fully to back twist and the cable to strengthen the core should be fixed, sustain tension at the same time;
2. cable, rows should be in the running, cable with the elevator to move up and down, moving, bending is frequent, soft, flexible;
3. cable, vertical demands a certain tensile strength;
4. work environment with oil to fire, elevator cable requirement is secondary;
5. small diameter, light weight.

Structure characteristics
1. USES the 0.2mm round copper wire bundle heave, winding and the isolation between conductor and insulation layer, into a higher stranded cable when increase the soft cable, bending performance;
2. Increasing cable strengthening core cable, inherit the mechanical strain, strengthening core using materials such as nylon rope, wire rope, in order to increase the tensile strength of the cable;
3. YTF cable made by neoprene sheath, in order to improve the weatherability of the cable and don't delay flammability.

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Cable insulation material field in our country

Cable insulation materials, especially high voltage cable insulation materials commonly used in plastics polyethylene, polypropylene, PVC, and other special plastic.
1. PE class cable insulation material
Polyethylenes cable insulation material high insulation resistance, voltage resistance performance is good, especially the dielectric constant and dielectric loss is small, the influence of temperature and frequency is small, and it has good physical and mechanical properties and water resistance, solvent resistance, drug resistance. Related patents on PE class cable insulation materials mainly involved polyethylene cable insulation materials on the flame retardancy, water tree electrical resistance, anti-aging, oxidation and resistance against wear and charred aspect as well as the effect of preparation technology on the improvement.
2. Polypropylene cable insulation material
Polypropylene class cable insulation material density is the smallest and lightest, its heat resistance and mechanical strength is better than that of PE, especially the high frequency characteristics, the modified flame retardant is tasted, can be obtained from foaming.
3. PVC insulated cable material
PVC insulated cable material resistant to high voltage and insulation resistance, flame retardant, oil proof, weather resistance, chemical resistance, corona resistance and water resistance performance, but its dielectric constant and dielectric loss is bigger, cold resistance is poorer, is often used to 1kv and below the wire and cable, semiconduction shielding and all kinds of wire and cable sheath.
4. Other cable material
In addition to the three general plastic formation of the cable insulation materials, fluorine plastic, polystyrene, polyimide and polyamide, polyester and other plastics is also used as cable materials, these materials have a certain feature is also used in some special occasions, such as ptfe, its thermal performance is good, continuous working temperature is 250 ℃, and electrical properties, flame retardancy is better also. But since they don't melt at high temperature, which is unfavorable for processing, and high mechanical strength is not enough, so often as the second polymer and three general plastic copolymerization or blending to improve the properties of the insulated cable materials, through special processing method, a small, separate and high frequency cable insulation materials used for high temperature wire.

In addition, in the field of application for a patent in China is more dispersed, patent quality remains to be improved, there are few enterprises or scientific research institutions formed by a series of interlocking technical patent protection. Anytekabel Co.,Ltd.(www.anytecable.com) the cable has passed CCC, CSA, TUV, CE...Such as certification. At the same time made the patent management system, fully mobilize the employees' innovation enthusiasm.

General Selection Principles of Wire and Cable

Generally pay attention to the choice of wire and cable type, specification (conductor cross section), when you choose wire and cable.
1. The choice of wire and cable model number
Consider the application, installation conditions and security, when you choose wire and cable. For example,
According to different applications, you can select the power cables, overhead insulated cables, control cables, etc.;
Depending on the installation conditions, you can choose the general plastic insulated cables, steel tape armoured cable, steel wire armoured cable, anti-corrosion cable, etc.;
According to the security requirement, you can choose flame-retardant cables, halogen-free flame retardant cable, fire-resistant cable, etc.
2. The choice of wire and cable specifications
Make sure the specifications (conductor cross section) of wire and cable, generally consider the selection condition of fever, voltage loss, economic current density, mechanical strength, etc.
According to experience, because of the large load current of low voltage power line, generally select section according to the heating conditions first, and then calculating the voltage loss and mechanical strength; Low-pressure flare path, because of its higher requirements on voltage level, can select section according to the allows the voltage loss condition first, and then calculating the heating condition and mechanical strength; For high voltage line, select section according to economic current density first, and then calculating the heating conditions and allowed voltage loss; And for high voltage overhead line, should also check its mechanical strength.

Development and Application of MHYV LSZH flame retardant cable

In the past more than 20 years of practice,  MHYV cable has experienced by innovation from Non flame-retardant to flame retardant, especially in the flame retardant cable flame retardancy test method and decision rule (386-1995, MT MT386-2011) issued and implemented, make the flame retardant properties of the mining cable effectively controled and improved.

But the existing MHYV flame retardant cable once heated combustion, the combustion release a large amount of smoke. Although with IEC 61034 or GB/T 61034-1998 measure the light transmittance of under 10%, but the release of hydrogen chloride (HCl) gas content is large, its content is more than 100 mg/g, even up to 200 ~ 300 mg/g. So thick smoke and toxic gases such as H2S and CO of human respiratory irritation and mischief, and narrow in underground environment, the affected people could not escape from the scene of the fire. According to foreign fire white paper records, this kind of "secondary disasters" casualties of personnel accounts for 70% ~ 80% of the entire fire casualties. In China's coal mine fire accident casualties, the number of people suffering from "secondary disasters" proportion is very big.

Flame retardant or Non flame-retardant cable materials will release a large amount of smoke and CO, HC1 gas when burning, in order to avoid or reduce fire accident "secondary disasters", the international electrotechnical commission (IEC) in 1982 and 1982 successively formulated and revised and IEC60754 IEC60754-1-2, in order to limit when releasing gas content (HC1 content < 5 mg/g, release the corrosive gas combustion of the aqueous solution pH > 4.3, conductivity < 10 TTS/ram). In 1991 and established IEC61034, in order to limit when releasing amount of smoke (smoke light transmittance > 60%). The country's naval engineering standard NES a 718 and a NES 713. The U.S. navy MILS24643 directly the NES a 713 standard to detect when releasing toxic gas content (regulation toxicity index < 5).

All these standards to restrict the cable such as flame retardant or not smoke and poison gas released by the combustion flame retardant materials provides effective and reliable basis, but in this high-risk industry, the mining cable in our country on the control of the LSZH cable is almost blank. When coal with low smoke and low halogen flame retardant burning pollution to the environment is smaller than the burning flame retardant cable, namely coal with flame retardant halogen free cable to reduce or reduce when the burning of "secondary disasters; At the same time performance can meet the requirements of coal mine cable material, is the main direction in the future. Research and application of MHYV low smoke low halogen flame retardant cable is very necessary and important.

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The role of wire and cable braiding

Wire and cable is mainly composed of conductive wire core, insulation, sheath layer, three basic structure. The difference between the wire and cable has no strict boundaries, but speaking from a broad meaning, cable structure is complex, it has complex sheath layer, and some only conductor and insulation wire structure is simple, some only weave tu la light armor layer or coating a layer of light soft armor layer. The conductive wire core wire and cable is used for the transmission of current. To reduce power loss and voltage, conducting wire core general selection of high conductivity copper and aluminum. The role of the insulating layer is to prevent the current along the radial leakage, ensure use safety. Therefore require insulating layer has good electrical insulating properties. Heat resistance and mechanical strength.
                      

Outside the insulated wire core or a cable core protection layer called the sheath of the cable. The main function is to protect the insulation sheath. Its main performance is moistureproof, prevent oil, anti-corrosion. Anti aging, sun fire resistant, as well as mechanical protection, but also has the electric and magnetic resistance etc. From the perspective of cable sheath, weaving is many kinds of wire and cable sheath or one of the outer sheath. However, according to the materials used in wire and cable braid braid and different parts in the structure of wire and cable, the role of the braid is obviously different.

cable braiding

The effect of fiber braid
For wire, fiber braid is a form of the light cover. Its main function is to protect the insulation is not affected by or less by all kinds of light, heat, moisture, low temperature, acid and alkali gases such as erosion and external mechanical force damage, to ensure that the wires, such as enhanced sheath is in the middle of the rubber or plastic sheath in cotton yarn, hemp fiber braid, in order to improve the strength of the sheath.
The effect of metallic braid
Metal braided layer are mainly copper, tin plated copper wire braid and steel wire (wire) two woven layer
Is the main purpose of seller, copper wire weaving:
1. Preventing electromagnetic interference shielding effect such as tin plated copper wire braided dedicated cable, wire weaving control cable, etc.
2. Eliminate shield of power cable surface potential, it bound power line and eliminate the induction, such as high voltage cable total shielding.
3. The shielding effect of security protection, in the main core insulation braided copper wire and with core or on the ground a good contact, timely response to the leakage situation, such as mining cable shielding
And social, is the main purpose of steel wire armoured:
L. mechanical protection. Such as Marine power cable CF31 type.
2. Under longitudinal tensile force, such as Marine geology exploration using magnetic measurement cable WC - GC, WCT.
3. The magnetic shielding.
By above can see, the role of braid in wire and cable is obvious, wire and cable prices also will be different, choose to pay attention to the use environment of wire and cable, wire and cable, in order to choose the right wire and cable.

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Longevity wire --- Nylon Wire

 According to the experience and the domestic test confirmed that the service life of the nylon thread twice that of ordinary PVC insulated wire, can reach more than 40 years. THHN/THWN polyvinyl chloride (PVC)/nylon 600v, polyvinyl chloride (PVC) sheathed control cable.


Structure
Conductor: conform to ASTM - B3 / B8 standard single or multiple strands of fine twisted into a bundle of 14-2/0 awg bare copper wire
Insulation: conform to UL1581 high dielectric strength of flame retardant PVC wire insulation (according to the customer request custom color) meet UL1581 THHN/THWN covering the outer insulation
Filling: three core or more than three core wire core plus padding, torn inside of the outer sheath with a nylon rope.
Sheath: in accordance with UL 1277 is prevented bask in, prevent leakage of PVC wire sheath (according to the customer request custom color)

Characteristics
THHN wire is the termite, rat bite, good heat resistance performance superior safety performance (heat resistant up to 200 degrees c)
Nylon wire on the surrounding environment without any damage, green, environmental protection, is a household decorates equipment power supply, lighting the best wire;
With light weight, smooth appearance, because nylon has its lubricity, threading is not easy to scratch, easy to wear pipe laying, brought to install installation convenience and economy;
Using nylon as sheath, beautiful appearance, small thermal deformation, has good thermal stability;
Has high mechanical strength and excellent abrasion resistance, cold resistance, surface hardness, bending strength, impact strength, chemical resistance, oil resistance, gasoline resistance and self-lubrication;

Application
Installed in the pipe, also can be installed for arbitrary voltage 600v machine tool equipment, home appliances and all kinds of control system.Suitable for indoor, outdoor, overhead, pipe, cable bridge, and no more than 600v circuit of directly buried installation of a variety of ways. For NEC class I, class II and classification of second-class dangerous environment. Its working temperature is 75 ℃ in the damp environment, dry environment of 90 ℃, the temperature is 130 ℃, emergency overload short circuit temperature is 250 ℃.Humid environment is not recommended in this kind of product access work in dc.

How to Identify Inferior Building Security Cable?

From the surface you can see pressure inside net regular "roughness", shows good processing technology, it won't produce the relative sliding, is good building security cable; Appearance is smooth, can not see compaction net "roughness", if knead sheathed have loose feeling with the hand, it is a bad cable.

Check the shielding layer braid net: if the braiding quantity is nough, copper braiding net, check the weldability, Tinned Copper wire, scrape to see if it is copper wire, the hardness of aluminum magnesium alloy wire is bigger than that of copper wire; braiding net is sparse, uneven distribution, and package not tight with cable insulation, it will be bad cable.

Check conductor: diameter - SYV cable of 0.78 - 0.8mm, SYWV cable 1.0mm; Recently there is a SYV75-5 conductor cable of 1.0mm diameter, the characteristic impedance of the cable will be certainly not 75ohms, should not applied to the transmission system of 75ohms.

Check the adhesion force of conductor and insulation layer: oblique incision insulating layer, according to the direction of stripping away conductor, the conductor and insulation layer have bonding process materials; Good wire cable has bigger adhesion force, poor cable without sticking.

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What is the difference between the silicone and rubber?

Silica gel is a kind of silicone rubber, belongs to the one-component room temperature vulcanization of liquid rubber.Once exposed to the air, the silane monomer condensation occur, which form a network structure, system of crosslinking, not melting and dissolving, elastic, state into rubber, adhesive objects at the same time. The thermal conductivity was a little higher than general rubber, once cured, it is difficult to separate the object of glue.
High elastic rubber polymer compounds. Including without vulcanization and has the variety of sulfide.Can be divided into two categories, natural and synthetic rubber. Natural rubber latex which rubber plant from the processed.

Synthetic rubber was prepared by monomer polymerization or polycondensation. Without vulcanization rubber commonly known as raw rubber or rubber. Has been vulcanized rubber as the vulcanized rubber, commonly known as vulcanized rubber or rubber.Widely used in the manufacture of tires, rubber hose, adhesive tape, insulation materials, rubber shoes, and other rubber products, etc. Silica gel caps are mainly made by the advanced silica gel, feel is relatively soft, stretch force is strong, and very durable.

Anytekabel Co.,Ltd offers an extensive range of flexible cable, control cable, Armoured Cable, Power Cable approved to International certifications,such as UL,CSA,CE,TUV,VDE,SAA. We keep the customer's demand as our guide, and our target is to be a high-tech enterprises with R & D, production, sales and service.

Accidents hidden danger of Cable construction is much more in winter

Low medium voltage power cable construction in winter, due to the outdoor temperature are below minus 10 ℃, low temperature of polyvinyl chloride and cross-linked polyethylene insulation and sheath material should suit to present hard brittle features, such as laying accidentally suffers accident knock against, in the process of insulation wire core and copper shield is easily damaged. Even after the cable laying the scene completion test can pass, but later after continuous electricity, cable in the damaged area through the capacitive current eventually, can lead to partial discharge, accelerate the insulation aging, lead to breakdown fault line.

This kind of situation in the low voltage cable performance is not outstanding, performed very well in the medium voltage cable. Sometimes cable factory test without any problems, laying the site due to the limitation of various conditions on cable directly without taking any measures in winter construction, cable laying completed after the scene test everything is normal, but later came a very short time, the power failure, anatomic failure point, appearance without any mechanical damage, but the internal insulation happens serious breakdown and ablation.

Anyte cable

In recent years, some new installation of medium voltage 10kv, 35kv cable fault due to various constraints, not at the scene to cable heating measures, directly around 10 ℃ below zero in winter construction installation on site. The power cable in a short time and white and relatively insulation breakdown fault, by accident, cable production and factory test did not appear abnormal, the scene completion test also smoothly. But electrify malfunction in short time, with no doubt this wire and cable to cable heating measures in winter construction is not relevant.

Environmental Friendly LSZH Flame-retardant Cable Material

  We all know that many kinds of harmful gas produced when the wire and cable flaming, such as carbon monoxide, sulfur dioxide, and so on. So the real things hurt the body is the poisonous gases in the fire scenes, among which many of these gases come from household wire and cable. What is the essential difference between Environmental Friendly Halogen-free Cable Material and Ordinary wire & cable material? Compare with ordinary wire & cable material, during the buring, the Environmental Friendly LSZH Flame-retardant Cable Material produce less toxic gas, and produce less smoke, also not easy to be lit.

 
What fields do Environmental protection low smoke zero halogen flame retardant cable material mainly used in?
You know the characteristics of Environmental Friendly LSZH Flame-retardant Cable Materials, obviously the price of the wire and cable of this material must be more expensive than the general material, it is mainly used in some densely populated public places, such as: cinema, and so on. Range can be involved in various types of wire and cable, such as: power cable, telecommunication cable and optical fiber cable, data communication cable, transport system cable, automobile, motorcycle, etc. There are special and strict requirements for wire and cable in these occasions. mong which, the cable insulation sheath material is critical, most of wires and cables we see everyday in some public places are made of low smoke zero halogen flame retardant cable materials.
 

Why is Environmental Friendly low smoke zero halogen flame retardant cable material eco-friendly?
Here we have to introduce a kind of important basic material: polyolefin resin, it is made of inorganic flame retardants fertilizer manufacturing. Due to the basic characteristic of the polyolefin resin and adding a large amount of inorganic flame retardants, gives the cable material flame features such as retardant, low smoke, halogen free, low toxicity and so on. But this kind of wire and cable material is not faultless, the physical and mechanical properties of polyolefin resin, electrical properties, such as performance, now with the improvement of science and technology level, we are improving and perfecting its performance. Changzhou Anytekabel Co.,Ltd., is also in constant research and exploration, believe in the near future we will make the material polyolefin resin much more perfect.

Fire-proof and explosion-proof of Power transformer

Power transformer is the main distribution power system of electric power equipment.Power transformer is mainly is to reduce the high voltage of the grid can be used directly for the 6000 V or 380 voltage, to supply electrical equipment. Such as transformer overload or short circuit inside, insulating material or insulating oil will decompose due to action of high temperature or electric spark, expansion and gasification, the transformer internal pressure has increased dramatically, may cause transformer shell explosion, a large number of insulating oil jet combustion, flow and will further expand the fire danger. In the operation of the fire explosion should pay attention to:
(1) can't overload operation: overload running for a long time, can cause heating coil, make the insulation aging, cause a short-circuit.
(2) often inspection insulation oil: oil should be regularly test, unqualified oil should be replaced in a timely manner, or take other measures.
(3) to prevent the damage of transformer wire and cable core insulation aging, core heat cause insulation aging for a long time.
(4) to prevent because of careless repair damage insulation, if found abrasion damage, will handle in time.
(5) ensure that wire contact is good, poor contact local overheating.
(6) to prevent lightning, transformer will be destroyed due to breakdown of insulation.
(7) short circuit protection: transformer coil short circuit or load, if protection system failure or protection fixed value is too large, could burn down transformer.To install and reliable for this short circuit protection.
(8) to protect good grounding.
(9) ventilation and cooling: if the transformer coil wire is A level of insulation, the insulation is given priority to with paper and cotton yarn.Temperature rise every 8 ℃ half to reduce its insulation life;Transformer normal running temperature below 90 ℃, about 20 years of life;If the temperature to 105 ℃, the life expectancy for 7 years.Transformer operation, to maintain good ventilation and cooling.

Germany daub special fluorescence fluid on cables anti-theft

There is copper exist in cable, wire and cable has become a target for hunting ground in many countries.Telecommunications companies to come up with new ways to do this, Germany, daub on the cable a special fluorescent liquid called "artificial DNA", contains unique code can be used in the lock owner. Deutsche telekom for cable theft losses every year hundreds of thousands of euros.September 30, the company launched a propaganda campaign to show that thief skills: company employee use of remote control helicopters to overhead cable daub the fluorescent liquid, although with the naked eye, coating liquid of cable is not much difference with ordinary cable but under uv light irradiation, daub is special color will be appeared.

Not only that, the liquid unique code as "invisible symbol", visible under a microscope.Through the coding, the true master of the police can find out items.This makes the thief when stealing wire and cable and channeling, must have the courage. Deutsche telekom has begun for the ground cable previously coated with "artificial DNA", is expected to be completed by the end of 2014.The company has not released the security measures. In Germany, railway company enterprise has applied the fluorescent liquid such as security, some people also apply it on the valuables.

Reason for longitudinal uneven of wiredrawing extrusion film

Resin plasticizing bad, may be inappropriate given: the heating zone temperature control cable instrument malfunction, resin mixed with different melt index and density of other relevant major resin: extruder factors such as low back pressure.Microscope (40 times) is not melt crystal point, squeeze film dark, opaque, viscous flow instability, caused by melting membrane volatility.Concluded that is the most effective way of plasticizing bad microscope check whether did not melt. The fault handling, you exclude resin is mixed with other resin method in melt index determination, and to determine standard index after comparison.

Then consider to adjust the temperature of the heating area, check the temperature controller.If it is found that the heating zone temperature controller has been heated and reach the given temperature, can reduce the screw rotation speed to achieve the goal of plasticizing good.Appropriate increase extruder back pressure, can increase the screen mesh to achieve, but high back pressure will cause the extruder screw thrust bearing damage.For through the temperature control, raw material, the flow to achieve fusion membrane stability, and production capacity and low, consider to change the screw design, replace the high efficiency screw.

Wire and cable fault side search method

The first thing to determine the fault types: "high impedance" or "low resistance" We're going to do different according to different fault types of fault location method. How to distinguish the high rent or a low resistance?Insulation resistance.High resistance and low resistance wire and cable without a very clear definition of value, usually 100 k under the considered low resistance, more than 100 k o considered high resistance.

Book a fault We according to the different fault types, using different methods to due to a fault, first of all get the approximate location of fault point.

Then we'll point fault accurately Before the precise point, we also need to know the detailed information of the fault cable laying we won't be able to arrive according to the value of preoperative near point of failure.If there is this kind of situation, we need to use beforehand "path" to determine the path of the cable, use range to determine the approximate location of the fault point.And then to be able to accurately fixed point.

If it is a high impedance fault, we should use "shock" to accurately fixed point, first by a high voltage pulse generator, at a certain time interval to shoot fault cable, high voltage pulse and fault point will be breakdown and continuous discharge.We by detecting the fault point discharge signals for accurate positioning.At this time we need a "precision" designated instrument, its principle is "magnetic acoustic time difference method", precisely: at the time of discharge cable is two signals, one is the electromagnetic signal, a signal is the sound of the discharge.Two signals from the point of failure due to the different velocity of propagation, reaches the receiver when there is a "time lag", like thunder when we see the lighting first and then hear the sound, we can accurately by judging the "time lag" positioning fault - lag the smallest place point of failure.

If it is a low resistance fault, we all know that low resistance grounding fault failure and even death, because of the low to ground resistance, discharge could not make it happen, we need the other way - "audio method".Using a powerful audio generator fault cable to a fixed frequency audio signal, and then use audio detector along the cable route.Due to very low resistance at fault point, the signal current will be here into the earth, look from the detector, reach the point of failure, the signal can suddenly become very small or even disappear.At this point we can locate the fault point.

At this time we can excavation flexible cables, dig the cable, after cutting to do joint fault section, do the pressure test, all OK, put into operation. But need clear confirmation when truncation cable fault cable, if errors occur, the consequences.

Wire and Cable Industry in China

Wire and cable industry is the second large industry next to the automotive industry in China. Fill Rate of products and occupancy of domestic market both over 90%. Worldwide, wire and cable gross output in China has been more than the United States, become the first major producer of wire and cable in the world. With the high-speed development of wire and cable industry of China, the number of new companies is rising continuously, overall technical level of the industry is increased sharply.

The development of Wire and cable industry, national economy and the automobile industry, shipping industry are closely related, even in a certain time, to a certain extent, the development of wire and cable industry represents the degree of a country national economy development.

Sustained Rapid economic growth of China provides a huge market space for wire products. The strong allure of China made the world focused on the Chinese market. In short decades from reform and opening-up, the huge production capacity formed by the cable manufacturing of China Knock the Socks off the world.

Anytekabel Co.,Ltd. in China, Changzhou is also in rapid development in recent years. We apply with the design concept of advanced precise cable manufacturing technology and mature production of German, cooperate with German cable company with technical, guided by the needs of customers, develop into a high-tech cable company combined of R&D, production, sales and service.

Introduction to irradiation and silane crosslinking cable difference

Customer orders are sometimes encountered model for WDZ - YJ (F) E flexible cables, this kind of cable should be interpreted as the name of the copper core irradiation crosslinking polyethylene insulation, low smoke zero halogen flame retardant polyolefin sheathed power cable, power cable product standards GB/T 12706.1 ~ 3-2008 of the rated voltage 1 kV to 35 kV (Um = 1.2 kV) = 40.5 kV (Um) squeeze, insulated power cables and accessories, the first part of appendix D "the cable products of the clause," said about insulation code method, for crosslinked polyethylene insulation, code-named YJ, did not distinguish between what crosslinking type (physical or chemical), belongs to physical crosslinking type irradiation crosslinking, and combined with "F" in the model, the industry said an idiomatic irradiation crosslinking insulation methods.Standards should be still for GB/T 12706-12706.

Customers use this model to use irradiation crosslinking insulation wire core to meet the requirements of the use of the special occasions.The irradiation crosslinking and ordinary silane insulation what are the advantages?Irradiation crosslinking is using high energy electron beam produced by the electron accelerator to the crosslinking of cable, the cable insulation layer of polyethylene structure.

By linear molecules into a three-dimensional network structure, formed less than the three dimensional lattice water molecules, the polyethylene surface and internal form dense layer, thus effectively prevent the hydroxyl and the combination of water molecules, the crosslinking method not only improves the heat resistance, abrasion resistance and flame retardant performance of wire and cable, of the block water. The crosslinking way no heat, no water, can make PE crosslinking, and can improve the flame retardant and electrical cable wire performance of cable.Make the cable has low smoke, halogen-free, flame retardant and high temperature resistant characteristics.

Application of commonly used Wire & Cable

AVR copper core PVC insulated soft wire, used in instruments and meters, electronic equipment and other internal with soft connection.RV copper core PVC insulated soft flexible cables wire connection is characterized by soft, flexible, outside diameter is small, lightweight, easy wiring, it is mainly used for MLJ mobile electric appliances, instruments and meters, household appliances, power lighting requirements when using soft occasions.BV copper core PVC insulated wire, more hard, for fixed installation, the difference between BV and RV core thicknesses, BV conductor, cable hard, internal wiring is difficult, closed to wiring is no problem, and good shape, the cost is low.BVR soft copper core PVC insulated wires, belong to semi-rigid, used for fixed installation, lay in the soft required. For high temperature, high temperature line should be adopted, such as AF - 200 high temperature wire, heat resistance, 200 ℃, but very expensive, should use less as far as possible.Use, also should according to the actual environment temperature is chosen.Try to use Can meet the requirements of heat resistance at 80 ℃, 90 ℃, 105 ℃ of wires.

Wire and cable used in low temperature environment, which requires the minimum ambient temperature and the minimum allowed in laying the bending radius, the installation, wire and cable insulation and sheath layer does not crack, and under the condition of low temperature long runtime from the molecular structure of curved prestressed effect or force and the action of cracking.For mobile or mobile use wire and cable, can withstand multiple demands in low temperature with small bending radius bending mechanical stress, and the insulating layer and sheath layer was not damaged, the requirements of the cable insulation and sheath under low temperature conditions can still maintain a certain flexibility and elasticity.With the requirement of electromagnetic interference, also should be shielded wire.

Five Categories of Wire and Cable Products

Five Categories of Wire and Cable Products
1. The bare wires and bare conductor products
The main characteristic of this kind of product is: pure metal conductor, insulation and sheath layer, such as steel core aluminum stranded wire, copper bus-bar, line of electric locomotive, etc; Processing technology mainly is the pressure processing, such as melting, rolling, drawing, twisted/compressed tightly twisted, etc.; Products are mainly used in suburban, rural, user, the main line, switch cabinets, etc.
2. Power cable
This kind of product main features are: the crowded outside the conductor insulation package, such as overhead insulated cable, or a few core stranded, such as more than two core overhead insulated cable, or add sheath layer, such as plastic/rubber wire and cable. Main technology has drawn, twisted, insulation extrusion, cabling, armored, sheath extrusion, such as combination of different processes of various products have a certain distinction.
Products are mainly used in hair, with, lose, and high voltage power transmission of the power supply circuit, through the current big, high voltage.
3. Electrical equipment wire and cable
Such products, the main characteristics are: various specifications, application range, use voltage in 1 kv and below is more, to derive new products constantly, in the face of special occasions, such as fireproof cables, flame retardant cable, low smoke zero halogen/against termites, low smoke low halogen cable, mouse cable, oil/cold/heat resistance, abrasion resistance cable, medical/farm/mining cable, thin wire, etc.
4. Communication cable and optical fiber
With nearly 20 years, the rapid development of communication industry, the product also has a remarkable development.From the past simple development to thousands of telephone and telegraph cable to cable, coaxial cable, optical cable, data cable, even combined communication cables, etc.
The product structure size is usually small and uniform, manufacturing high accuracy requirement.
5. The electromagnetic wire
Mainly used for all kinds of motors, instruments and meters, etc.
Wire and cable derivative/new products is mainly due to the application of different requirements and equipment applications, convenience and reduce the equipment cost and other requirements, and use new materials, special materials, or change the product structure, improve the technological requirements, or will produce different varieties of products are combined.
With different materials such as flame retardant cables, low smoke zero halogen/low smoke low halogen cables, termite resistance, prevent the mouse cable, resistant to oil/cold/heat resistance wire, etc.
Change the products structure, such as: fireproof cables, etc.
Improve the technical requirements such as: medical cable, etc.
Composite products such as: OPGW, etc.
Convenient installation and decrease the cost of equipment such as: prefabricated branch cable, etc.

Widely used Wire and cable

Wire and cable is used for electricity, communications and related transmission USES of materials."The wire" and "cable" and no strict boundaries.Is usually some conclusions, the product of small diameter, simple structure, less product called wires, no insulation called bare wires, the other is called cable;Conductor cross-sectional area of the larger (more than 6 square millimeter) called the big wire, the smaller (less than or equal to 6 mm2) called a small wire, insulated wire is also known as wire cloth.

Electric wires are consisting of a root or a few soft wire, coated with soft sheath;Cable is composed of one or several root insulated wires, outside with made of metal or rubber tough outer package again.Cables and wires are generally by the conductor, insulation cover and protect the skin of three components.Common characteristics of the cable is as follows: CEF - ethylene propylene rubber insulation neoprene sheath, Marine flame-retardant power cable.CVV, PVC insulated, PVC sheathed Marine flame-retardant power cable.Oxygen tank wire often USES BV, BX, RV, RVV series wire.