Electric Power Optical Cable

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Electric power communication network is major communication network of the country and support networks of modern

network with the main feature "three second high". Power industry has a unique advantage in developing optical fiber

communication as power network spread all over the urban and rural areas and laying fiber optical cable along the

electric power lines has high reliability and economy. Special cables used in power communication network mainly

include ADSS cable and OPGW cable. OPGW cable is special for power line formed from traditional structure added

fiber unit. It also has the function of overhead ground wire and optical cable.

This optical cable uses 6 loose tubes (or partial gasket for packing) to wind around the FRP and become the a complete

round cable core, which is stranded of certain number of Kevlar with potentiation after being covered with PE internal sheath.

Finally, the PE external sheath will be squeezed. The loose tube is made of the materials with great temperature properties.

Several single mode or multi mode optical fiber (2-8 core) of a proper extra length and the oil jelly used for moistureproof optical fiber are put into the tube. The slits of the

cable core are fulfilled with water-blocking compound.

The compact and round shape cable core is a combination of the loose sleeve pipe (gasket for packing) and center-strengthened core, the gap in the cable core is filled with water retarding compound. The polyethylene overlayer will become optical cable after the plastic-plated Aluminum belt is covered vertically.

Q:I bought a LG Plasma TV, it comes with 3 Ferrite cores, two of them is a little bigger than the diameter of the power plug and it's not tight on it and one is small, is it effective to but the bigger one one the power cable?: It doesn't make any difference, they are just as effective if they are loose. Actually the bigger ones should be more effective at filtering because there is more ferrite material in them.

Q:Why is my 2 Gage power cable from the battery to my amp is to hot and makes a big spark and burns the wire when you meet one end to the other end?: Too hot means the current is very high. Probably in excess of 200 amps. I suspect there is a short in the amp, specially if you tried to connect it hot and drew a spark. That will kill a lot of electronics. .

Q:Beginner cost, do not know how the calculation of power cable works, is directly from the drawings on the amount of it?: In general, a 42U cabinet to 200 information points within the appropriate

Q:Hey guysA 6mm power cable can hold up to 25A, but, if a product draws a maximum of 4A, in theory, can this 6mm be reduced? If so, by approx how much?Cheers, much appreciated!! :): yes. Resistance, and therefore voltage drop, is inversely proportional to the square of the radius or diameter. in other words, cut the diameter in half to 3 mm, the current capability would be 1/4 or 6 amps. 25/4 = 6.25, and square root of that is 2.5, and 6mm/2.5 = 2.4 mm, using only voltage drop considerations. If temperature in the wire is important, it gets more complicated, as you have to consider physical size of the wire, insulation type and thickness, etc. Of course wiring codes would override all this.

Q:What does the cable (YJV-5 * 6) mean?: Full name: cable ZR-YJV22-4 * 16MM2ZR: flame retardant ----- YJV22: copper conductor cross-linked polyethylene insulated PVC sheathed double steel belt wrapped armored power cable --- 4 * 16MM2: 4 core, each core 16 square millimeters.

Q:Suppose load is 100KW, length 50m, how to calculate cable size. If we know current Is any easy mathod to calculate cable size.: There are two issues to consider, cable heating and voltage drop. Of the two, voltage drop is by far the easiest. You need to determine what the allowable voltage drop in you cable is. The voltage drop is just I x R where I is the current and R is teh round trip cable resistance. The specification of 100 kW isn't enough. If its a high tension 100 kV line, the current is only 1 amp and a run of 16 AWG wire would deliver about 99,999 volts out of the original 100,000 volts to your load. If its a 100 volt system then a 4 AWG wire would only deliver only 20 volts to the load. The formula for wire resistance (in AWG) is that 10 AWG has 0.001 ohm/ft. Each increase of 1 in the gauge increases resistance by the cube root of 2 (about 25%). You calculate by picking what voltage drop you can live with, for the known current figure the resistance, knowing the length figure the resistance per foot, and then pick the AWG using the above. The second concern is wire heating. Although you could do the heat transfer calculations, instead look up the allowable ampacity for any wire in an electrical engineers or NEC handbook.

Q:It's a 250GB Western Digital Caviar drive, sold with an iMac back in early 2007... I want to see if I can recover some files from it, but I have no idea where to start.: Hard Drive cable: similar to a dock, but they are just a cable. Simply plug into an open USB or FireWire port, and plug the other end into the hard drive. They have the same issue as a dock though - no protection for the hard drive itself: it just sits exposed on your desk. (I can't find a link for this one in the couple seconds I checked. Sorry) Things to remember with all those options: * Make sure your choice supports your OS: most options work with both Windows and OS X, but some are only one or the other. * Know what interface your hard drive uses. Is it ATA? SATA? IDE? Make sure you buy the product with the right plug for your HDD. * Look at reviews. Especially if you go with a dock: there are lots of cheap ones that have crappy reviews. Do a little research before you buy. Personally, I prefer the case. They work great and you can always switch the hard drive out whenever you want. I just replaced 3 of my 250GB drives with 1TB and it took me all of 5 minutes! Enjoy! PS - I use NewEgg.Com for most of my HDD needs. They have awesome prices and sweet return policies in case something doesn't work when you get it (although that's never happend to me - knock on wood).

Q:I'd like to know what type of wire/specs. for a 3 phase high power cable that can handle a 41.6KVa that will be buried under the ground? The voltage will be a 220 volts in 60 Hz. could you show me how to calculate or any charts are really appreciated.: There's not enough information in your question to give an exact answer. Figure the highest current in any of the phases assuming that your load may not be perfectly balanced or it may have a nonlinear current waveform. That will establish the minimum size of the conductors. Another factor to consider is the maximum allowable voltage loss at full current. You also need to know if voltage sags due to startup or inrush currents will be a problem. A long cable will need to have larger conductors to keep the losses within your acceptable range. Don

Q:I originally tried to plug my US Xbox power cable through a converter, but it overloaded the cable and broke. Microsoft's advice to me was buy a Belgian Xbox, but they never answered my question about the compatability of a US Xbox 360 and a European Xbox 360 power cable.I appreciate any help I may get on this question.: Euro is 220v to 250v or thereabouts, U.S. is only 110v. That's why your old PSU blew up. You needed to buy a step down voltage converter for avout 15 Euros or so. The Xbox PSU itself will handle the mains for whichever country it was designed for and convert the power to a DC voltage of 12v for any Xbox 360.

Q:what the size of power cable 3 core for motor 18.5 Kw with star dalta starter?: Full load current is 32 amps,phase current is 18.4 amps Hence 3 core 15 sq.mm power cable is req.or 3 core 6 sq.mm 2 nos of cables req. to connect motor to starter.

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