Yog VLF kuaj AC lossis DC?
Oct 31, 2025
1. Dab tsi yog VLF kuaj?
VLF sawv rau qhov tsawg zaus. Nws yog qhov kev kuaj mob no siv rau hauv nruab nrab thiab siab- voltage cables (thiab lwm yam appstratataus zoo li tig machine thiab hloov pauv) los ntsuas qhov kev sib deev ntawm lub rwb thaiv tsev.
Tus qauv hluav taws xob zaus hauv feem ntau ntawm lub ntiaj teb yog 50 HZ lossis 60 HZ. Kev sim VLF siv cov Sinusoidal AC WaveToidal AC WaveToidal ntawm ntau zaus nyob rau hauv ntau ntawm 0.1 hz rau 0.01 hz. Nov yog qhov "tsawg tsawg zaus."
2. Vim li cas siv VLF AC es tsis txhob siv hluav taws xob ntau?
Kev tshuaj ntsuam lub cable ntev ntawm nws cov rated ac voltage (piv txwv li, 15 kV ntawm 60 Hz) yuav tsum tau teeb meem, hnyav, thiab kim tseem ceeb capacitance. Qhov kev xeem teeb yuav tsum muab ntau npaum li cas ntawm cov hluav taws xob muaj zog (vars) kom them thiab tawm qhov kev muaj peev xwm no muaj peev xwm 60 lub sij hawm ib ob.
Los ntawm drastically txo qhov zaus mus rau 0.1 hz, lub peev xwm ntsuas (XC {= 1 / 2 (piv rau 60 HZ). Qhov no txhais tau tias qhov kev xeem teeb tsuas yog yuav tsum tau muab 1 / 600th ntawm qhov tam sim no, ua cov khoom siv me dua, ntau lub portable, thiab muaj nqis pheej yig dua.
3. Cov kev sib piv tseem ceeb: VLF vs. DC sim
Nov yog qhov "AC lossis DC?" tsis meej pem feem ntau tshwm sim. Rau kaum xyoo, DC hipot (muaj peev xwm siab) yog tus qauv txheem. Txawm li cas los xij, nws tau tshawb pom tias DC kev sim uas muaj kev cuam tshuam tseem ceeb thiab muaj peev xwm ua rau muaj kev phom sij rau cov neeg muaj kev phom sij polymeric), thaum VLF yog qhov kev xaiv zoo dua.
Ntawm no yog qhov sib piv:
| Yam zoo | DC HIPOT TEEV | VLF AC TEST |
|---|---|---|
| Qhov Chaw Tsim Tshuaj | Ntshiab dc | Sinusoidal AC ntawm 0.1 Hz |
| Kev ntxhov siab ntawm rwb thaiv tsev | Siv kev ntxhov siab raws li rwb thaiv tsev tsis kam. Tuaj yeem tsim cov nqi chaw nyob hauv lub rwb thaiv tsev. | Siv kev ntxhov siab raws li Dielectric lub peev xwm caper, ua haujlwm zoo rau kev ua haujlwm. |
| Cov nyhuv rau qhov tsis xws luag | Tuaj yeem "kho" dhau ib qho voids thiab tsis xws luag ib ntus. Tej zaum yuav tsis tshwm sim tsis muaj zog uas yuav poob raws li AC kev ntxhov siab. | Qhov kev hloov polarity tsis zoo ib yam li cov ntoo dej thiab cov voids, ua rau lawv tawg thiab raug txheeb xyuas. |
| Kev pheej hmoo ntawm kev puas tsuaj | Kev pheej hmoo siab ntawm kev puas tsuaj rau kev ua kom zoo nkauj XLPE cable vim tias qhov chaw them nyiaj ntxiv, uas tuaj yeem ua rau kev ua tsis tiav lossis yav tom ntej. | Muaj kev nyab xeeb dua rau cov rwb thaiv tsev. Yog tias ib qho cable tsis ua tiav, nws tsis nyob ntawm qhov kis tsis muaj zog uas yuav ua rau poob sai sai hauv kev pabcuam rau txhua qhov. |
| Teb kev tshaj tawm | Tsis txhob rov qab siv hluav taws xob kev ntxhov siab tau ntsib thaum lub sijhawm ua haujlwm AC ua haujlwm ib txwm. | Zoo tshaj tawm cov kev ntxhov siab AC kev ntxhov siab ntawm kev ua haujlwm ib txwm, tsuas yog ib tus nqi qeeb qeeb. |
