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Umgomo wokulinganisa ukuvuza kwamanje kwe-dc yesivikelo ngokuyisisekelo uyafana nowokulinganisa ukumelana nokufakwa kwe-insulator.
Umehluko uwukuthi: i-dc leak test voltage ngokuvamile iphakeme kune-voltage ye-megohmmeter, futhi ingalungiswa, i-megohmmeter, ngaphandle kwalokho, iphakeme kunokusebenza kweziphambeko ezitholwe yi-megger, izwela ukukhombisa i-crack porcelain insulation, ingaphakathi lesemishi. ukufakwa kwe-insulation kuthinteke ngokuswakama kuthinteke ngokuphuka okumanzi nokwasendaweni, ukuwohloka kukawoyela ovikelayo okuxekethile, i-char ebusweni bokufakwa, njll.
Ukuhlolwa kwe-voltage ye-Dc kanye nesilinganiso samanje sokuvuza nakuba indlela iyafana, kodwa indima yayo ihlukile, eyokuqala iwukuhlola amandla okumelana nokufakwa, i-voltage yokuhlola iphakeme;Lesi sakamuva sisetshenziselwa ukuhlola isimo sokufakelwa, i-voltage yokuhlola iphansi kakhulu.Ngakho-ke, ukumelana ne-voltage ye-dc kubaluleke ngokukhethekile ukuthola ukukhubazeka okuthile kwendawo, futhi kusetshenziswa kabanzi ekuhlolweni kokuvimbela ama-motor-voltage aphezulu, izintambo nama-capacitor.Inezici ezilandelayo uma iqhathaniswa nokuhlolwa kwengcindezi ye-ac.

1. Izinto zokuhlola zilula futhi zincane

I-Dc ukumelana nemishini yokuhlola i-voltage ilula futhi ilungele ukuhlolwa kokuvikela emkhakheni.Isibonelo, kolayini bekhebula, uma i-ac imelana nokuhlolwa kwe-voltage, amandla wamanje ngekhilomitha ngalinye kuzoba ama-ampere amaningana, adinga okokusebenza okukhudlwana kokuhlola umthamo.Uma ukuhlolwa kwe-voltage ye-dc kwenziwa, i-insulation leak yamanje kuphela (kufika ezingeni le-milliampere) ehlinzekwa ngemva kokuzinzisa.

2. Ingakwazi ukukala ukuvuza kwamanje ngesikhathi esifanayo

I-Dc ukumelana nokuhlolwa kwe-voltage ingabonisa ukukhubazeka kokugxilisa ingqondo ekugxiliseni ngempumelelo ngokulinganisa ukuvuza kwamanje ngenkathi ikhuphula amandla kagesi kancane kancane.Umfanekiso 3-1 ukhombisa amajika amanje avuzayo ajwayelekile okufakwa kwejeneretha ngesikhathi sokuhlolwa kokumelana nokumelana ne-dc voltage.Ukuze uthole ukwahlukanisa okuhle, amandla avuzayo akhuphuka ngokuhambisana ne-voltage futhi inani lamanje lincane, njengoba kuboniswe ku-curve 1. Uma ukufakwa kumswakama, inani lamanje liyakhuphuka, njengoba kuboniswe ku-curve 2. Ijika 3 libonisa ukuba khona kokukhubazeka kokugxilisa ingqondo ukwahlukanisa.Lapho ukuvuza kwamanje kudlula izinga elithile, imbangela kufanele ikhonjwe ngangokunokwenzeka ukuze kuqedwe.Uma ukuvuza kwamanje okuzungeze izikhathi ezingu-0.5 i-Ut ikhuphuke ngokushesha, njengoba kuboniswe ku-curve 4, khona-ke i-generator isengozini yokuphuka ngesikhathi sokusebenza (ngaphandle kwe-overvoltage).

Lapho ukuhlolwa kwe-dc voltage ukumelana kwenziwa ezintanjeni zamandla, ukufundwa kokuvuza kwamanje kuvame ukusetshenziselwa ukuthola amaphutha.Isibonelo, lapho umehluko wokuvuza wamanje wezigaba ezintathu mkhulu kakhulu noma ukuvuza kwamanje kukhuphuka ngokushesha, i-voltage yokuhlola inganyuswa noma ubude besikhathi sokumelana ne-voltage singanwetshwa ukuze kutholwe amaphutha ngokuya ngesimo esithile.

3. Ukulimala okuncane kokufakwa kwe-insulation

I-Dc high voltage inomonakalo omncane ekufakweni komkhiqizo ohloliwe.Uma i-dc acting voltage iphezulu kangangokuthi ukuphuma kwengxenye kwenzeka esikhaleni somoya, inkambu kagesi ephikisayo edalwe ukushajwa okukhiqizwe ukukhishwa izowenza buthaka amandla enkambu esikhaleni somoya, ngaleyo ndlela ivimbele inqubo yokukhipha ingxenye egebeni lomoya.Uma kuwukuhlolwa kwe-ac voltage, ngenxa yokushintsha njalo kwesiqondiso se-voltage, njengokukhishwa kwegebe lomoya, igagasi ngalinye lokukhishwa okuyingxenye, lokhu kukhishwa kuzovame ukukhuthaza ukubola kwezinto ezivikelayo eziphilayo, ukuwohloka kokuguga, ukunciphisa ukufakwa. ukusebenza, ukuze amaphutha wendawo akhule kancane kancane.Ngakho-ke, i-dc ukumelana ne-voltage test nayo inohlobo lokuhlola okungabhubhisi ngokwezinga elithile.

Uma kuqhathaniswa ne-ac standstand voltage test, okubi kwe-DC ukumelana nokuhlolwa kwe-voltage iwukuthi: ngenxa yokusabalalisa okuhlukile kwamandla kagesi ngaphakathi kwe-insulation ngaphansi kwe-AC ne-DC, ukuhlolwa kwe-DC ukumelana nokuhlolwa kwe-voltage akusondele kakhulu kulokho okungaphansi kwe-AC.Ngakho-ke, ngekhebula le-xLPE, akukhuthazwa ukusebenzisa ukuhlolwa kwe-voltage ye-DC, ukukhishwa kokuhlolwa kwe-voltage ye-DC akulula ukukuhlanza, kulula ukuholela ekushajisweni kokugcinwa, ukulimaza ukuhlolwa.
Ukukhethwa kwe-dc voltage ukumelana nokuhlolwa kwe-voltage nakho kuyinkinga ebalulekile, kubhekiselwa ku-insulation power frequency AC ukumelana ne-voltage ne-ac, isilinganiso samandla okuphuka kwe-DC, futhi ngokuyinhloko kusekelwe ekuhlangenwe nakho kokusebenza ukuze kuthuthukiswe.Isibonelo, i-stator winding ye-generator izikhathi ezingu-2-2.5 i-voltage elinganisiwe;Ezintamboni ezingu-3, ​​6, 10kV, thatha izikhathi ezingu-5 ~ 6 ku-voltage elinganisiwe, kumakhebuli angu-20, 35kV, thatha izikhathi ezingu-4 ~ 5 ku-voltage elinganisiwe, futhi kumakhebuli angaphezu kuka-35kV, thatha izikhathi ezi-3 ku-voltage elinganisiwe.Isikhathi sokuhlolwa kwe-dc voltage ukumelana singaba side kunesovivinyo lwe-AC voltage ukumelana, ngakho-ke ukuhlolwa kwejeneretha ukukhuphula i-voltage elinganiselwe izikhathi ezingu-0.5 zesiteji ngasinye ngezigaba, futhi uhlale u-1min esigabeni ngasinye ukuze ubheke futhi ufunde ukuvuza. inani lamanje.Ngesikhathi sokuhlolwa kwekhebula, i-voltage yokuhlola kufanele iqhutshwe imizuzu emi-5 ukuze kubhekwe futhi kufundwe inani lamanje lokuvuza.