Q: Vim li cas ob qhov kev kuaj Hipot sib txawv? Kuv tsis tuaj yeem siv ib qhov HV xwb?
A: Lawv sim txawv lub cev thaj chaw. Siv cov kev ntsuam xyuas "Walls" (Main Insulation); Induced tests "Rooms" (Longitudinal Insulation).
|
Feature |
Siv Voltage |
Induced voltage |
|
Thaj chaw |
Winding vs. Av / Theem |
Tig vs. Tig / Txheej vs. Txheej |
|
Voltage qhov chaw |
External Test Transformer |
Internal sib nqus induction |
|
Kev sib txuas |
Tag nrho cov bushings luv rau HV |
Zoo siab txais tos los ntawm LV sab |
|
Txuj |
IEC 60076-3 / IEEE C57.12 |
IEC 60076-3 (DVF) Kev lees paub |
Q: Vim li cas thiaj li yuav tsum tau ua qhov kev ntsuam xyuas ntawm "Double Frequency"?
A: Kom tsis txhob Sib Nqus Saturation. Los ntawm kev nce zaus (f), peb tuaj yeem ua ob npaug ntawm qhov ntsuas hluav taws xob (V) yam tsis pub dhau lub peev xwm flux (Phi) ntawm cov tub ntxhais hlau.
Physics Formula:
• V=4.44 * f * N * Phi
• If f = 50Hz, doubling V doubles Phi ->CORE BURN.
• If f = 150Hz, doubling V REDUCES Phi ->SAFE TEST.
Q: Kuv puas tuaj yeem ua tiav -voltage Applied Hipot ntawm lub davhlau ya nyob twg nruab nrab?
A: TSIS TXAUS SIAB rau cov ntsuas ntsuas ntsuas. Siv cov kab puv - ntsuas qhov hluav taws xob mus rau qis dua - ntsuas nruab nrab yuav ua rau lub rwb thaiv tsev tam sim ntawd.
Txoj Cai Kev Nyab Xeeb:
• Rwb thaiv tsev tag nrho: OK. Neutral ntsuas tib yam li kab kawg.
• Qib Rwb thaiv tsev: Hauv av nruab nrab thaum kuaj lossis siv ib txoj kev Induced tshwj xeeb.
Q: Hnov suab nrov thaum lub sijhawm 60s tuav. Yuav txiav txim Pass/Fail li cas?
A: Sib txawv ntawm Surface Flashover (sab nraud) thiab Internal Breakdown.
|
Kev soj ntsuam |
Suab |
Kev kuaj mob |
Kev ua |
|
Bushings |
Ntse Pop/Crack |
Flashover (External) |
Clean/Sry and Re-test |
|
Hauv Tank |
Muffled Thud/Bang |
Kev tawg (Internal) |
TSIS TAU. Loj Fault. |
|
Meter |
Sudden mA Spike |
Rwb thaiv tsev tsis ua hauj lwm |
Yuav tsum tau kuaj xyuas |
Q: Dhau lub 60s tuav. Vim li cas thiaj rov- ntsuas IR thiab DGA?
A: Ciaj sia nyob tsis yog kev hla. Koj yuav tsum xyuas kom meej tias tsis muaj "Hidden Wounds" raug tsim.
Txoj Cai Kev Ncaj Ncees:
❶ IR Check: Final IR must be >= 80% ntawm thawj IR. Kev poob> 30% yog xav tias.
❷ DGA Check: Tshawb xyuas Acetylene (C2H2) tom qab kuaj. Txawm tias me me ua pov thawj hauv arcing.