Plaistigh Coiteann Do Sreanga Agus Cáblaí

Is plaisteach é poileitiléin le cur i bhfeidhm leathan agus tomhaltas mór faoi láthair. De réir na sonraí sa tábla, is ábhar inslithe leictreach maith é poileitiléin le caillteanas meson beag, friotachas ard, neart réimse ard miondealaithe, friotaíocht maith aimsire agus próiseasacht. Mar gheall ar a theocht íseal oibre, áfach, úsáidtear é go príomha mar insliú cáblaí cumarsáide. Tá ard-neart agus cruas agus tréscaoilteacht íseal uisce ag poileitiléin meándlúis agus ard-dlúis. Úsáidtear iad den chuid is mó mar sheath cábla. Mar sin féin, tá an míbhuntáiste ag poileitiléin Z mór, is é sin, tá sé éasca a dhó agus tá deataigh dubh láidir aige. Dá bhrí sin, tá go leor contúirtí i bhfolach don chomhshaol tar éis a chur i bhfeidhm.

Crosslinked polyethylene is an excellent thermosetting insulating material formed by adding crosslinking agent to low-density polyethylene. On the basis of inheriting many excellent properties of polyethylene, it improves the mechanical properties, weather resistance and allowable working temperature, so it has become a good insulating material for power cable Z at present.

Mar gheall ar ghníomhairí trasnasctha éagsúla, cruthaítear próisis trasnasctha éagsúla. Faoi láthair, tá trí chineál crosslinking ceimiceacha, uisce te crosslinking agus ionradaíochta crosslinking. Úsáidtear crosslinking ceimiceach go príomha le haghaidh cáblaí meánmhéide agus ardvoltais (cosúil le 10kV agus níos airde); Úsáidtear trasnascadh uisce te agus trasnasc ionradaíochta go príomha le haghaidh cáblaí ísealvoltais (1kV agus thíos).

Tá dlúthbhaint ag feidhmíocht inslithe XLPE lena íonacht. Caithfidh insliú cáblaí ardvoltais agus ultra-ardvoltais os cionn 35kV poileitiléin tras-nasctha ultra-ghlan a ghlacadh, rud a éilíonn ní hamháin íonacht ard na n-amhábhar, ach freisin glaineacht ard trealaimh próisis tras-nasctha agus timpeallacht, agus cobhsaí. agus próiseas iontaofa.

Ba chóir a thabhairt faoi deara go bhfuil airíonna inslithe poileitiléin agus poileitiléin tras-nasctha le"quirk", is é sin, go bhfuil siad oiriúnach le haghaidh insliú AC seachas insliú DC, go háirithe laghdóidh ardvoltas DC a gcuid saol inslithe. Dá bhrí sin, glacann insliú cáblaí DC den chuid is mó insliú rubair nó insliú páipéir ola. Thairis sin, tá"eagla uisce" ag insliú poileitiléin agus tras-nasctha poileitiléin, agus is minic a bhaineann a miondealú le huisce a bheith ann, is é sin, foirmiú brainsí uisce" GG]quot; faoi ​​ardvoltais, rud a fhágann damáiste inslithe. Dá bhrí sin, nuair a úsáidtear poileitiléin agus poileitiléin tras-nasctha mar insliú cáblaí ardvoltais agus ultra-ardvoltais, seachnófar uisce sa phróiseas próiseála, stórála, iompair agus easbhrúite inslithe, agus beidh struchtúir blocála uisce ann. lasmuigh den sciath inslithe cábla, mar shampla sheath miotail.

Compared with polyethylene, polyvinyl chloride and paper insulation, one Z great advantage of cross-linked polyethylene insulation is that the working temperature is increased by 20 ℃, which improves the safety of the cable and reduces the input cost of the cable. For example, when the line flow is the same (such as 300A), the cross-sectional area of copper conductor of polyethylene or polyvinyl chloride insulated cable (such as YV or VV) needs 120mm2, while the cross-linked polyethylene insulated tape men's basketball copper conductor needs only 70mm2. It can be seen how remarkable the advantages of XLPE insulated cable are.

PVC has good physical and mechanical properties and excellent process properties. It is not only the most used plastic in the 20th century, but also the main insulating material and sheath material of low-voltage wires and cables. However, in the 21st century, PVC will gradually shrink or even fade out in the cable market. There are two reasons. On the one hand, people's safety awareness has improved and hope to use halogen-free materials, so many halogen-free materials came into being. There is no doubt that it will become a new favorite of the cable industry in the 21st century and occupy the market. On the other hand, PVC has five weaknesses: first, it has high density, about 1.5 times that of XLPE, and high insulation cost; Second, the working temperature is low; Third, the dielectric loss is high, more than 100 times higher than that of cross-linked polyethylene; Fourth, poor cold resistance (- brittle at 15 ℃); Fifth, toxic gas (HCl) is released during combustion. The mechanical properties, electrothermal properties and insulation resistance of crosslinked PVC developed in recent years have been greatly improved. Some small section cables have entered the market by irradiation process and have been applied in equipment wires, high-voltage lead wires, automobile wires and building wiring, but their halogen shortcomings cannot be changed.

Úsáidtear fluoroplastics go forleathan i sreanga agus cáblaí mar gheall ar a dteocht ard oibre, meán beag, insliú maith, friotaíocht aimsire, friotaíocht aigéad agus alcaile, friotaíocht ola agus retardancy lasair.