春晨JEM电机引接线

江苏春晨电缆有限公司生产jbq电机引接线，春晨jem电机引接线

arctic star power transmission and distribution network: wireand cable is the main carrier of power transmission, its range ofuse is very extensive, especially in the "city network, rural powergrid" transformation and new projects on the use of very largeamount. recently, from the sampling results of supervisiondepartments across the country, the problem is still moreprominent, in 2010, guangdong province electric power supply bureau8 checks on the xlpe power cable manufacturers in the site, one ofthe 6 manufacturers is not , only 2 manufacturers; foshan technical supervision bureau recently checks66 samples in the market. 63 of them are un, only 3; 2007 beijing olympic project joint beijing electric powersupply bureau checks the of the cable, substandard productsinvolving more than 10 cable manufacturing enterprises. to thisend, this article specifically on the market demand for a largenumber of wires and cables, for some inferior products to do thefollowing analysis and identification.春晨jem电机引接线

in general, the authenticity of insulated wire on the market oruse is mainly the product or packaging labels and have no 3c mark,but the actual user purchase situation, many problems ofinsulated wire even if their products or packages also have the 3clogo, so sometimes difficult to distinguish the authenticity and inthis case, you can not easily believe. according to theintroduction, inferior wires have great harm. the first is lowsafety performance. the insulating layer of many wires is not madeof regular insulating plastics, but is made of recycled plastics.the insulation layer is peeled off with a single peeling, which iseasy to cause the insulation layer to be current broken andleakage, which poses a great threat to the safety of the users'lives. secondly, the thickness of the conducting inner conductordetermines the load of the wire to the current, and the greater thecurrent, the thicker the inner core of the conductor. it is foundin the inspection that the actual cross section size of many wiresis far less than the size of the wires. as many wires known as thecore cross-section of 4 mm2, measured only 2.5 square millimeters,and some even only 1.5 square millimeters. when consumers use thisproduct, it will cause excessive resistance to heat, causingelectrical fire hazard.春晨jem电机引接线

there are severalues for identifying inferior insulatedwires:

first, ordinary wires

(a) to read labels and printed words on the insulating sheath,if there are typos or printed words shades, fuzzy, to attractattention.

(two) finger rub some insulating sheath, poor insulation cablejacket is easy to fade, especially the red line will appear thiskind of problem, by rubbing fingers after leaving skin color orline printed words on the online skin erased general is inferiorline.

(three) with the nail scratch, pinch the insulation skin, youcan pull down, pinch down a piece of general bad line.

(four) bend the insulated wires repeatedly, the insulationmaterial of bad line is poor, and the insulation layer will breakafter bending 3~4 times.

(five) ignite the insulation layer, after leaving the flame,spontaneous combustion is inferior line.

(six) look at the core color, inferior line color is dark and nometal luster.

(seven) the length of the package is generally 100 meters perlap or ring, the national allowable error is + 0.5%, the length ofthe inferior wire is only 95 meters, or even less; some aremisleading on the package with "code" as the unit.

(eight) if the above 7 methods can not be determined, but alsocan measure the insulation wire diameter and core diameter, themeasured value is large, basically is inferior insulation wire(note: there are a lot of bad manufacturers, not conductor section,increase insulation or sheath thickness to the wire diameter todeceive users).

two 、 halogen free low smoke environmental protection wire

at present, domestic technology or raw materials, only the useof irradiation technology to ensure insulation low smokehalogen-free flame retardant wire is not affected by hightemperature and humid environment destruction, low smokehalogen-free flame retardant wire and non irradiation crosslinking,even after water test, there are problems in the design ofengineering application. non radiation crosslinking 2005 nanjingcivil engineering using the low smoke halogen-free flame retardantwire in a humid environment after laying, multi line insulationstrength failure, only the replacement of all, there are manydomestic design institutes (such as the beijing institute ofarchitecture of the olympic project, beijing west railway stationunderground mall, guangdong science center building etc.) lszhcable engineering regulations shall not use non irradiationcrosslinking. because the non irradiation cross-linking low smokehalogen-free flame retardant wire are particularly vulnerable towater (low smoke halogen-free materials using a large number of althermoplastic (oh) or 3 mg (oh) 2), according to the nationalelectric wire & cable testing center test: non irradiationcross-linking low smoke halogen-free flame retardant wire afterwater temperature experiment after the insulation resistancedecreased 100~1000 times.

therefore, the identification of such wires, very simple, is tosee whether the production enterprises have radiation cross-linkedcable production line

three, refractory wire

to identify inferior wires, the mica tapes should be recognizedon the basis of ordinary wires.

(1) 2 layers of mica tape are usually wrapped, and the overlaprate is about 50%.

(two) the of mica tape is also critical, gently rub,such as powder, that is bad.

(three) flame burned mica, such as flame through mica tape, isinferior refractory wire.

electrician's little knowledge

power p=i2 x r type: i -- current r -- conductor resistance

the r is inversely proportional to the cross section s of theconductor. that is to say, the shoddy wiring on the conductor crosssection will not only cause the conductor overheating andinsulation aging, but also cause the danger of electrical fire andthe loss of electric energy. for example, the cross-section is only90%, then the standard cross-section of the conductor to consumemore than 10% of the electric energy.

in short, such as the use of inferior