Iindaba

Umgaqo wokulinganisa ukuvuza kwangoku kwe-dc yesigqubuthelo ngokwesiseko iyafana naleyo yokulinganisa ukuxhathisa kokugquma.
Umahluko ngulo: i-dc evuzayo yovavanyo lombane iphezulu kune-megohmmeter yombane, kwaye inokulungelelaniswa, i-megohmmeter, kungenjalo, iphezulu kunokusebenza kweziphene ezifunyenwe yi-megger, inovakalelo lokubonisa i-crack porcelain insulation, ingaphakathi lesandwich. Ukufakwa kwe-insulation kuchaphazeleka ngokufuma kuchaphazeleke ngokufuma kunye nokwaphuka kwendawo, ukuthotywa kwe-oyile ekhuselayo ekhululekileyo, i-char ecaleni komphezulu we-insulation, njl.
Uvavanyo lombane weDc kunye nomlinganiselo wangoku wokuvuza nangona indlela iyafana, kodwa indima yayo yahlukile, eyokuqala kukuvavanya amandla okumelana nokufakwa, umbane wovavanyo uphezulu;Le yokugqibela isetyenziselwa ukujonga imeko yokufakelwa, i-voltage yokuvavanya iphantsi.Ke ngoko, ukuxhathisa kwamandla ombane e-dc kubaluleke kakhulu ekufumaneni iziphene ezithile zasekhaya, kwaye isetyenziswa ngokubanzi kuvavanyo lothintelo lweemoto ezinombane ophezulu, iintambo kunye neecapacitors.Inezi mpawu zilandelayo xa kuthelekiswa novavanyo loxinzelelo lwe-ac.

1. Izixhobo zokuvavanya zilula kwaye zincinci

I-Dc ukumelana nezixhobo zovavanyo lombane ilula kwaye ilungele uvavanyo lothintelo ebaleni.Umzekelo, kwiintambo zentambo, ukuba i-ac imelana novavanyo lombane, i-capacitance current ngekhilomitha nganye iya kuba ngama-ampere amaninzi, ifuna izixhobo ezinkulu zovavanyo lwamandla.Xa uvavanyo lwe-voltage ye-dc lwenziwa, kuphela umbane wokuvuza okhoyo (ukuya kuthi ga kwinqanaba le-milliampere) unikezelwa emva kokuzinziswa.

2. Inokulinganisa ukuvuza kwangoku ngexesha elinye

I-Dc yokumelana novavanyo lwe-voltage inokubonisa iziphene zokugxininiswa kwi-insulation ngempumelelo ngakumbi ngokulinganisa ukuvuza kwangoku ngelixa isonyusa kancinci i-voltage.Umzobo 3-1 ubonisa iigophe zangoku ezivuzayo zokugquma ijenereyitha ngexesha lovavanyo lokumelana nombane we-dc.Ukufakela okulungileyo, ukuvuza kwangoku kunyuka ngokuhambelana ne-voltage kunye nexabiso langoku lincinci, njengoko kuboniswe kwi-curve 1. Ukuba i-insulation imanzi, ixabiso langoku liyenyuka, njengoko kuboniswe kwi-curve 2. I-Curve 3 ibonisa ubukho beziphene zokuxininisa ukugquma.Xa ukuvuza kwangoku kudlula umgangatho othile, isizathu kufuneka ichongwe kangangoko kunokwenzeka ukuphelisa.Ukuba ukuvuza kwangoku malunga ne-0.5 amaxesha e-Ut inyuke ngokukhawuleza, njengoko kuboniswe kwi-curve 4, ngoko i-generator isengozini yokuphuka ngexesha lokusebenza (ngaphandle kokugqithisa).

Xa uvavanyo lokumelana nombane we-dc luqhutywa kwiintambo zamandla, ukufundwa kokuvuza kwangoku kudla ngokusetyenziselwa ukufumana iziphene.Umzekelo, xa umahluko wamanqanaba amathathu okuvuza okukhoyo mkhulu kakhulu okanye ukuvuza kwangoku kunyuka ngokukhawuleza, umbane wovavanyo unokunyuswa okanye ixesha lokumelana nombane linokwandiswa ukufumana iziphene ngokwemeko ethile.

3. Ukunciphisa umonakalo kwi-insulation

I-Dc ephezulu yombane inomonakalo omncinci kwi-insulation yemveliso evavanyiweyo.Xa i-voltage esebenzayo ye-dc iphezulu kangangokuba ukukhutshwa kwenxalenye yenzeke kwi-gap yomoya, indawo yombane ekhawuntayo ebangelwa yintlawulo eveliswa kukukhutshwa iya kwenza buthathaka amandla entsimi kwisithuba somoya, ngaloo ndlela inqanda inkqubo yokukhupha inxalenye kwisithuba somoya.Ukuba luvavanyo lwe-ac voltage, ngenxa yokutshintsha rhoqo kwicala lombane, njengokukhutshwa kwesithuba somoya, isiqingatha ngasinye samaza okukhutshwa ngokuyinxenye, oku kukhutshwa kuya kuhlala kukukhuthaza ukubola kwezinto ezikhuselayo eziphilayo, ukuwohloka kokwaluphala, ukunciphisa ukugquma. ukusebenza, ukwenzela ukuba iziphene zasekuhlaleni ngokuthe ngcembe zandise.Ke ngoko, i-dc yokumelana novavanyo lwe-voltage nayo inohlobo lovavanyo olungonakalisiyo ukuya kuthi ga kwinqanaba elithile.

Xa kuthelekiswa novavanyo lwe-voltage ye-ac, into engalunganga ye-DC yokumelana novavanyo lombane kukuba: ngenxa yolwabiwo lwamandla ombane olwahlukileyo ngaphakathi kwe-insulation phantsi kwe-AC kunye ne-DC, uvavanyo lwe-DC lokumelana novavanyo lombane alusondele kwinyani njengaleyo iphantsi kwe-AC.Ngoko ke, kwikhebula le-xLPE, akukhuthazwa ukusebenzisa uvavanyo lwe-voltage ye-DC, ukukhutshwa kovavanyo lwe-voltage ye-DC akulula ukuyibeka icocekile, kulula ukukhokelela ekuhlawuleni ukugcinwa, ukonakalisa uvavanyo.
Ukukhethwa kombane we-dc wokumelana novavanyo lombane kuyingxaki ebalulekileyo, sisalathiso kumbane wokugquma amandla ombane we-AC ukumelana nombane kunye ne-ac, umlinganiselo wokophuka we-DC, kwaye ikakhulu usekwe kumava okusebenza ukuphuhlisa.Ngokomzekelo, i-stator winding ye-generator ngamaxesha angama-2-2.5 i-voltage elinganisiweyo;Kwiintambo ezi-3, 6, 10kV, thatha amaxesha ama-5 ~ 6 amandla ombane alinganisiweyo, kwiintambo ze-20, 35kV, thatha amaxesha angama-4 ~ 5 ombane olinganisiweyo, kunye neentambo ezingaphezulu kwe-35kV, thatha amaxesha ama-3 ombane olinganisiweyo.Ixesha lovavanyo lokumelana nombane we-dc linokuba lide kunelo lovavanyo lokumelana nombane we-AC, ke uvavanyo lwejenereyitha kukunyusa umbane olinganiselweyo ngamaxesha angama-0.5 kwinqanaba ngalinye ngokwezigaba, kwaye uhlale i-1min kwinqanaba ngalinye ukujonga nokufunda ukuvuza. ixabiso langoku.Ngexesha lovavanyo lwekhebula, i-voltage yokuvavanya kufuneka iqhutyelwe kwi-5min ukujonga nokufunda ixabiso langoku lokuvuza.