Q1: Vim li cas Induced Voltage Withstand Test (IVW) tseem ceeb rau cov transformers loj dua li tus qauv Separate Source Withstand Test (Hipot)?
A: Qhov Kev Xeem Separate Source (Hipot) feem ntau ntsuas qhovlub ntsiab rwb thaiv tsev(windings rau hauv av thiab nruab nrab ntawm windings), qhov twg tag nrho winding yog nyob rau tib lub peev xwm. Hauv qhov sib piv, qhov ntsuas qhov ntsuas qhov ntsuas hluav taws xob (IVW) ua rau lub zog hloov pauv los ntawm qhov qis-voltage sab kom induce high voltage ntawm siab -voltage sab. Qhov no realistically stresses lublongitudinal rwb thaiv tsev(inter-tig, inter- txheej, thiab coj mus rhaub- hloov rwb thaiv tsev). Txij li thaum feem ntau ntawm cov rwb thaiv tsev tawg nyob rau hauv loj transformers tshwm sim nyob rau hauv lem, IVW nrog PD saib xyuas yog cov feem ntau tso cai txoj kev rau kev ntsuam xyuas nyob rau hauv dielectric kev ncaj ncees.
Q2: Vim li cas thiaj yuav tsum tau teem caij rau 150Hz–200Hz (Frequency Doubling) rau Induced Withstand tests es tsis txhob tus qauv 50Hz/60Hz?
A: Qhov no yog qhov yuav tsum tau tiv thaivmagnetic core saturation. Raws li qhov sib nqus flux mis Φ=U/(4.44⋅f⋅N), yog tias qhov zaus ff tseem nyob tas li ntawm 50Hz thaum qhov ntsuas hluav taws xob UU nce mus rau 1.5x tus nqi ntsuas, qhov flux ΦΦ kuj tseem yuav nce 1.5x. Qhov no ua rau cov tub ntxhais saturation loj heev, uas ua rau cov excitation tam sim no loj heev uas muaj peev xwm hlawv tawm lub windings instantaneously. Los ntawm kev nce qhov zaus ff mus rau 150Hz lossis siab dua, peb tuaj yeem ua tiav qhov yuav tsum tau muaj qhov ntsuas hluav taws xob siab thaum ua kom cov tub ntxhais flux nyob rau hauv lossis txawm qis dua qhov ntsuas qhov ntsuas, ua kom muaj kev nyab xeeb ntawm ib puag ncig.
Q3: Yuav ua li cas peb thiaj li paub meej txog keeb kwm yav dhau PD suab nrov tsawg dua 10pC rau 500kV chav kawm kev xeem hauv ib cheeb tsam?
A: Ua tiav a<10pC background noise level requires a "Three-Tier" protection strategy:
Qhov chaw lim: Lub Variable Frequency Power Source yuav tsum suav nrog kev ua haujlwm siab -multi-theem LC qis- dhau cov limkom tshem tawm siab - zaus harmonics tsim los ntawm IGBT hloov.
Spatial Shielding: Txhim khoprecision- polished ob -tier corona ringsnrog ib txoj kab uas hla ntawm Greater los yog sib npaug rau 1000mm Ntau dua los yog sib npaug rau 1000mm ntawm siab -voltage terminals (divider thiab bushings) los suppress huab cua corona nyob rau hauv siab - teb zog.
Grounding Logic: Kev siv a"Ib leeg -Point Star Grounding"system siv hnyav- lub luag haujlwm tooj liab busbars txhawm rau tshem tawm kev cuam tshuam tam sim no los ntawm cov voj hauv av.
Q4: Vim li cas 1040kVA / 260kV qhov system suav tias yog "zoo tagnrho siab-spec" tshuaj rau kev sim 66kV / 40MVA transformer?
A: Qhov no sawv cev rau "dhau-kev qhia tshwj xeeb rau kev ntseeg tau" lub tswv yim. Txij li thaum lub kaw lus ntsuas qhov ntsuas hluav taws xob (260kV) yog qhov siab tshaj qhov ntsuas qhov siab tshaj plaws uas yuav tsum tau muaj rau 66kV transformer (kwv yees . 140kV), cov cuab yeej kuaj ua haujlwm ntawm qhov tsis tshua muaj hluav taws xob sab hauv kev ntxhov siab. Yog li ntawd, nwstus kheej -tsim tawm ib feem ntawm tus kheej yog tsis tsim nyog. Qhov no muab qhov ultra- qhov chaw kuaj dawb huv rau kev ntes cov teeb meem tsis zoo nyob rau hauv lub tshuab hloov pauv (xws li micro- npuas hauv cov roj los yog cov burrs me me), loj heev txhim kho kev kuaj mob rhiab heev thiab raug.
Q5: Dab tsi yog qhov tseem ceeb ntawm 2D / 3D PRPD cov qauv rau cov kws ua haujlwm thaum kuaj xyuas qhov tsis raug?
A: PRPD (Phase-Tau Txais Kev Tso Tawm Ib Feem)cov qauv ua haujlwm raws li "tus ntiv tes" ntawm kev tiv thaiv kev puas tsuaj. Los ntawm kev soj ntsuam cov mem tes faib txheeb ze rau sine yoj theem (symmetry, txoj kab nqes, thiab zaus), engineers tuaj yeem faib cov yam tsis xws luag:
Point Discharge (Corona): Feem ntau tshwm nyob ze voltage peaks nrog lub meej "roob" duab.
Floating Electrode Discharge: Characterized los ntawm qhov ruaj khov amplitude thiab cov haujlwm ruaj khov.
Internal Void Discharge: Exhibits ib tug dav, elliptical faib. Qhov no tso cai rau kev kuaj mob ntawm qhov chaw kom hloov zuj zus los ntawm kev tshawb pom "yog tias" muaj qhov paug tawm los txheeb xyuas "dab tsi" yog tso tawm, muab cov lus qhia meej rau kev hloov pauv tom ntej lossis kho.