Introduction of the cause and consequence of power cable fever

Power cable by a certain load current, will be hot, with the increase of load current and cable surface temperature is higher, if not handled in time, the consequences. Such as: polyvinyl chloride (PVC) cable, wire core temperature of 70 degrees is limit considered, low surface temperature will be 5 ~ 10 degrees. So the cable surface temperature under 60 degrees basic is safe, considering from the power maintenance, the lower the temperature, the better, of course.
In the operation of the cable in heating reasons are as follows:
1. Cable conductor resistance does not conform to the requirements, resulting in cable heating phenomenon in running.
2. Cable wide choices, the use of the conductor cross section of the cable is too small, in the operation of the overload phenomenon, after long time use, the heating and cooling of the cable have fever due to unbalanced phenomenon.
3. Arrange too dense, cable installation, ventilation cooling effect is not good, or cable near too close to other sources of heat, affected the normal heat dissipation of the cable, may also cause cable heating phenomenon in running.
4. Joint manufacturing technology is bad, no pressure to close, cause whenelectrified resistance is too large, also will cause the cable to produce hot phenomenon.
5. Cable insulation is not good, cause the insulation resistance is small, also can produce in the operation of the heating phenomenon.
6. Armored cable, local sheath damage cause slow damage to insulation performance, after the water gradually reduce insulation resistance, can cause heating phenomenon in the operation of the cable.
After cable heating phenomenon, if you don't find out why timely troubleshooting, continuous electric cable to continue after the operation will produce heat insulation breakdown phenomenon. Cable causing interphase short circuit trip phenomenon, serious may cause fire.

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The reason of power cable fault

The reason of power cable fault

1. Insulation aging metamorphism
Electric power cable insulation will suffer with effect of thermal, chemical and mechanical action, so that the insulating medium physical and chemical changes, and decreased the insulation of the medium level. Insulation be affected with damp be affected with damp. The middle connector or terminal head caused by structure and seal or the installation quality is bad insulation be affected with damp be affected with damp; Lead manufacturing cable package leaving sand holes or cracks and other defects, also can make the cable to be affected with damp be affected with damp.
2. Cable overheat
There are many causes of the cable overheating. Internal cause is the cable insulation inside the air gap caused by free local heat, so that insulation carbonization. External cause is installed on the cable populated areas, cable tunnel and cable, wear in the drying tube and with access to cable, cable due to cable overload or bad heat dissipation, and make the insulation damage of acceleration.
3. Mechanical damage
Mainly refers to the external force of cable damage. This is mainly due to the vehicle vibration and other mechanical action, make the cable shape. Cable deformation in bending excessive, damaged the internal insulation or cause insulation inside the air gap.
4. Sheath corrosion
Due to electrolysis corrosion or chemical action make the power cable lead package, because of the nature and degree of corrosion, lead covered with red, yellow, orange and pale yellow sponge compound or similar pores.
5. Overvoltage caused the breakdown
Atmosphere overvoltage and inner overvoltage of cable insulation breakdown caused by stress exceeds allowable values. And analyze the actual fault show that many outdoor terminal fault, is caused by atmospheric overvoltage.
6. Middle connector, terminal head of design and production process problems
Stripping semiconductor, damage to internal insulation or insulating surface particles, dust and other impurities; Cable head seal bad, make the internal insulation has moisture, cause insulation be affected with damp be affected with damp; Cable joint process is not standard, non-standard seal, cause ground; Production environment humidity is big, cause the production site (cable head) insulation integrity of be affected with damp be affected with damp; Cable grounding errors, causing the ground wire forming circulation or rupture.

PVC cable servo motor

So-called servo motor cable by the signal wire and power cable conductor, its special design makes it ideal for automation applications, such as: drag chain system, automatic loading and unloading equipment, plug-in components, gantry crane robot, the use of machine tools and other need to keep on moving, the whole tin copper braiding makes it suitable for the electronic jamming signal transmission, can also be applied to reduce the electromagnetic radiation. The cable diameter small, save the cable installation required space has excellent resistance to mineral oils and high wear resistance, and high density of weaving to ensure without interference signal and the pulse transmission, softer when in low temperature. In terms of performance, the working voltage is 0.6/1 kv, temperature range of use: mobile installation: - 5 ℃ to + 70 ℃, fixed installation: to 40 ℃ to + 80 ℃. In terms of structure: it is made of many strands of fine twisted copper conductors, meet VDE0295 / IEC228 5 classes; Insulation is composed of very low capacitance PVC/TPE compounds, outer sheath is highly wear resistant PVC base mixture, insulation and outer sheath can be customized according to customer's request. Core aspects, especially the power line and signal of wire twisted together, fill in the strengthening core, braided shielding is tin plated copper wire weaving, optical cover about 85%.

Introduction of the flexible cable

Flexible cable - is drag chain movement system, the power transmission material, cable of choice for signal transmission carrier, also known as: drag chain cable, towing cable, mobile cable, robot cable, etc.
Flexible cable conductor structure mainly according to DIN VDE and IEC 228 standard 0295 stranded copper wire structure, sheathed with low viscosity, more Flexible wear-resisting material, to slow the cable wear rate in the continuous moving back and forth.
Flexible cable according to the functional division is mainly divided into: sensor/encoder cable, servo motor cable, robots cable, clean cable, drag chain cable system.

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According to the model can be roughly divided into the following categories:
The flexible control cable
1. PVC sheathed flexible control drag chain cable, flame retardant CC101 bending radius: 8x
2. PVC sheathed flexible shielding control drag chain cable, flame retardant CC111 bending radius: 10x
3. PVC sheathed flexible control cable drag chain cable, flame retardant CC120 bending radius: 5x
4. PVC sheathed flexible shielding control drag chain cable, flame retardant CC121 bending radius: 8x
5. PUR sheath flexible control drag chain cable, oil resistant, acid and alkali resistant, hydrolysis resistance, uv resistance, low temperature resistant, wear resistant, flame retardant CC127 bending radius: 8x
6. PUR sheath flexible control shielded drag chain cable, oil resistant, acid and alkali resistant, hydrolysis resistance, uv resistance, low temperature resistant, wear resistant, flame retardant CC117 bending radius: 10x
7. steel wire braided flexible control drag chain cable, uv protection, good low temperature resistance, wear resistance, CC158 bending radius: 10x
8. PETP outer sheath flexible control drag chain cable, oil resistant, acid and alkali resistant, hydrolysis resistance, uv resistance, low temperature resistant, wear resistant, flame retardant CC160 bending radius: 5x
9. PETP sheathed flexible control shielded drag chain cable, oil resistant, acid and alkali resistant, hydrolysis resistance, uv resistance, low temperature resistant, wear resistant, flame retardant CC133 bending radius: 10x
Flexible power cable
10. PVC sheathed flexible power drag chain cable, flame retardant CC305 bending radius: 8x
11. PVC sheathed outside the shield flexible power drag chain cable, flame retardant CC336 bending radius: 10x
12. PETP outer sheath flexible shield drag chain power cable, oil resistant, acid and alkali resistant, hydrolysis resistance, uv resistance, low temperature resistant, wear resistant, flame retardant CC358 bending radius: 10x
13. PETP outer sheath flexible shield power drag chain cable, oil resistant, acid and alkali resistant, hydrolysis resistance, uv resistance, low temperature resistant, wear resistant, flame retardant CC371 bending radius: 8x
The flexible data/bus cable
14. PVC sheathed flexible drag chain cable block data. CC41 bending radius: 8x
15. PUR outer sheath flexible shield data drag chain cable, oil resistant, acid and alkali resistant, hydrolysis resistance, uv resistance, low temperature resistant, wear resistant, flame retardant CC43 bending radius: 10x
16. PETP outer sheath flexible shield data drag chain cable, oil resistant, acid and alkali resistant, hydrolysis resistance, uv resistance, low temperature resistant, wear resistant, flame retardant CC46 bending radius: 10x
17. PETP drag chain outer sheath flexible shield data cable, oil resistant, acid and alkali resistant, hydrolysis resistance, uv resistance, low temperature resistant, wear resistant, flame retardant CC48 bending radius: 12x
Flexible servo cable
18. PUR outer sheath servo drag chain flexible shield cable, oil resistant, acid and alkali resistant, hydrolysis resistance, uv resistance, low temperature resistant, wear resistant, flame retardant CC46 bending radius: 10x

Method to ensure the performance of the cabe Outdoors

The conventional five types of copper cable buried or overhead laying will likely lead to a particular network along the wiring circuit transmission failure, so choose the existing outdoor buried enhanced class cable will bring cheap link.Before deciding the outdoor LAN cable in response to its designed to be fully understood. Over the years, the characteristic of moisture proof protection network has been applied in the communication cable, the aluminum polymeric material overlap the sealing as protection, reduce the water vapor permeability path to prevent water entry.

However an unprotected dry cable will need more than six months to a year due to infiltration of liquefaction, a dry with moisture-proof protection network cable will be completely protected. This design about similar to foil screen LAN cable, cable end connected with simple. So, wiring system designers must consider the application environment, including the parameters of the environment and the influence of the following cable.

If Cable placed on: the eaves. As long as the cable not exposed to direct sunlight or high temperature, standard LAN cable can be used, it is recommended to use pipes. Outside the wall. Avoid direct sunlight metope and artificial damage; In the pipeline. As in the pipeline, pay attention to the damage of the plastic pipe and metal pipe heat conduction; Dangling application/aerial cable. Considering the sag of the cable and stress.The installation of the high flex cable conduit check of dry or wet degree on a regular basis; Underground pipeline. To facilitate future upgrades, cable replacement and phase segregation and surface pressure and the surrounding environment, laying pipe is a good method. But don't hope that the pipeline will stay dry, it will affect the selection of cable types.

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E-mail: anytecable@anytecable.com

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.

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.