Q: Vim li cas DC Hipot tam sim no nruj me ntsis txwv los ntawm cov qauv zoo li IEEE 400.1 rau XLPE cables?
A: Vim tias XLPE yog cov khoom siv polymer. Nyob rau hauv siab DC hluav taws xob teb, nws raug kev puas tsuaj los ntawm qhov tshwm sim hu ua Space Charge Accumulation.
Kev puas tsuaj Mechanism:
• Electron Traping: DC voltage tsav electrons / ions rau hauv rwb thaiv tsev, ntxiab rau ntawm polymer interfaces.
• Trapped Charge: Cov nqi hluav taws xob tseem nyob hauv qhov rwb thaiv tsev rau hnub lossis ob lub lis piam tom qab kuaj.
• AC Lub Hwj Chim Rov Qab: Flipped polarity 50/60 zaug/sec ua rau AC teb ua ob npaug -nce tawm tsam cov nqi.
• Cov txiaj ntsig: Cov chaw hauv zos skyrockets (E_tag nrho=E_AC + E_space), ua rau tsob ntoo sai sai thiab tawg sai.
IEEE Standard View: IEEE 400.1 hais tias DC kuaj ntawm XLPE tuaj yeem ua rau muaj kev puas tsuaj mus tas li. Nws tsis pom qhov tsis xws luag; nws tsuas yog ua puas qhov chaw noj qab nyob zoo.
