Okwangoku, ezisetyenziswa ngokuqhelekileyoizinto zokugqumaiintambo DC polyethylene. Nangona kunjalo, abaphandi baqhubeka befuna izixhobo zokugquma ezinokubakho, ezinje ngepolypropylene (PP). Nangona kunjalo, ukusebenzisa iPP njengesixhobo sokugquma intambo kuzisa iingxaki ezininzi.
1. IiPropati zoomatshini
Ukuhlangabezana neemfuno ezisisiseko zothutho, ukufakwa, kunye nokusebenza kweentambo ze-DC, imathiriyeli yokugquma kufuneka ibe namandla athile omatshini, kubandakanya nokuguquguquka okuhle, ukolula ngexesha lekhefu, kunye nokuchasana kwefuthe lobushushu obuphantsi. Nangona kunjalo, i-PP, njengepolymer ecwebe kakhulu, ibonisa ukuqina ngaphakathi koluhlu lobushushu obusebenzayo. Ukongeza, ibonakalisa ubuqhophololo kunye nokuchaphazeleka kokuqhekeka kwiindawo ezinobushushu obuphantsi, ukusilela ukuhlangabezana nezi meko. Ke ngoko, uphando kufuneka lugxininise ekuqiniseni nasekulungiseni iPP ukujongana nale miba.
2. Ukuchasa ukuguga
Ngexesha lokusetyenziswa kwexesha elide, ukugqunywa kwentambo ye-DC ngokuthe ngcembe kukhula ngenxa yeziphumo ezidityanisiweyo zokuqina kombane ophakamileyo kunye nokuhamba ngebhayisekile eshushu. Oku kuguga kukhokelela ekunciphiseni kwiipropati zomatshini kunye ne-insulation, kunye nokunciphisa amandla okuphuka, ekugqibeleni kuchaphazela ukuthembeka kunye nobomi benkonzo yekhebula. Ukuguga kokugquma ikhebhula kubandakanya oomatshini, umbane, i-thermal, kunye nemiba yeekhemikhali, kunye nokuguga kombane kunye ne-thermal eyona nto ixhalabisayo. Nangona ukongeza i-antioxidants kunokuphucula ukuxhathisa kwe-PP ukuguga kwe-thermal oxidative ukuya kwinqanaba elithile, ukungahambi kakuhle phakathi kwe-antioxidants kunye ne-PP, ukufuduka, kunye nokungahlambuluki kwabo njengezongezo kuchaphazela ukusebenza kwe-PP ye-insulation. Ke ngoko, ukuthembela kuphela kwi-antioxidants ukuphucula ukumelana nokuguga kwePP ayinakuhlangabezana nobomi kunye neemfuno zokuthembeka kwe-DC cable insulation, ifuna uphando olongezelelweyo lokuguqula iPP.
3. Ukusebenza kweInsulation
Intlawulo yendawo, njengenye yezinto eziphembelela umgangatho kunye nobomi behigh-voltage DC iintambo, ichaphazela kakhulu ukuhanjiswa kombane wendawo, amandla e-dielectric, kunye nokuguga kwezinto zokugquma. Izinto zokugquma iintambo zeDC kufuneka zicinezele ukuqokelelana kwentlawulo yendawo, ukunciphisa isitofu semirhumo yendawo efana ne-polarity, kwaye kuthintele ukuveliswa kweentlawulo zesithuba esingafaniyo ne-polarity ukuthintela ukugqwetheka kwebala lombane ngaphakathi kwendawo yokugquma kunye nojongano, ukuqinisekisa amandla okuqhekeka okungachaphazelekiyo kwaye ubomi bentambo.
Xa iintambo ze-DC zihlala kwindawo yombane ye-unipolar ixesha elide, ii-electron, ii-ion, kunye ne-ionization yokungcola eveliswa kwizinto ze-electrode ngaphakathi kwe-insulation iba yindleko yendawo. Ezi ntlawuliso zifuduka ngokukhawuleza kwaye ziqokelelane kwiipakethi zentlawulo, ezaziwa njengokuqokelelwa kwentlawulo yendawo. Ke ngoko, xa usebenzisa iPP kwiintambo zeDC, uhlengahlengiso luyimfuneko ukucinezela ukuveliswa kwentlawulo kunye nokuqokelela.
4. I-Thermal Conductivity
Ngenxa yokungahambi kakuhle kwe-thermal, ubushushu obuveliswa ngexesha lokusebenza kweentambo ze-DC ezisekelwe kwi-PP azikwazi ukutshabalalisa ngokukhawuleza, okukhokelela ekuhlukeni kobushushu phakathi kwamacala angaphakathi nangaphandle kwi-insulation layer, ukudala indawo yokushisa engalinganiyo. I-conductivity yombane yezinto zepolymer iyanda ngokunyuka kwamaqondo okushisa. Ke ngoko, icala langaphandle le-insulation layer kunye ne-conductivity ephantsi liba lula ekuqokeleleni intlawulo, okukhokelela ekunciphiseni ukuqina kombane. Ngaphezu koko, i-gradients yobushushu ibangela ukutofa kunye nokufuduka kwenani elikhulu leentlawulo zendawo, ukuphazamisa ngakumbi intsimi yombane. Okukhona iqondo lobushushu likhulu, kokukhona uqokelelo lwentlawulo yendawo eninzi lwenzeka, kuqinisa ukugqwetheka kwebala lombane. Njengoko bekuxoxiwe ngaphambili, ubushushu obuphezulu, ukuqokelelwa kwentlawulo yendawo, kunye nokugqwethwa kwentsimi yombane kuchaphazela ukusebenza okuqhelekileyo kunye nobomi benkonzo yeentambo zeDC. Ke ngoko, ukuphuculwa kwe-thermal conductivity yePP kuyimfuneko ukuze kuqinisekiswe ukusebenza okukhuselekileyo kunye nobomi benkonzo ende yeentambo zeDC.
Ixesha lokuposa: Jan-04-2024