Transpower, TSO nyob rau hauv New Zealand thawj zaug siv cov pa phem ntsuas ntsuas thaum lub sij hawm uprating ntawm nws HVDC transmissionsystem. Lub teb chaws tsuas yog HVDC qhov system tau tsim nyob rau xyoo 1965, ntsuas ± 250 kV, 600 MW, thiab kev ua haujlwm muaj kuab paug tshwm sim feem ntau tau txais txiaj ntsig zoo tshaj nws thawj 24 xyoo ntawm kev ua haujlwm, ob qho tib si hauv av thiab ntug dej hiav txwv.
Qhov txuas HVDC no tau hloov kho tom qab ob theem. Ua ntej, nws tau uprated rau +250/-350 kV, 1240 MW los ntawm reconfiguring thevalve pawg, txhim kho 350 kV valve pawg tshiab thiab reinsulating kab rau 350 kV. Xyoo 1989, cov kev cai rwb thaiv tsev rau 350 kV cov cuab yeej raug txiav txim siab thiab tau pib ua haujlwm los sau cov ntaub ntawv muaj kuab paug ntawm ntau qhov chaw raws kab thiab ntawm cov kab hluav taws xob. Qhov kev pab cuam no ntsuas ESDDon energized kis tau tus mob insulators ntawm 8 kab qhov chaw.
Cov pa phem flashover kev ntsuam xyuas tau ua tiav ntawm hom insulators siv ntawm 250 kV kab (piv txwv li NGK CA808porcelain) nrog rau cov qauv siv niaj hnub no (NGK CA745-EJ porcelainfog hom) los tsim kom muaj kev sib raug zoo. Cov kev ntsuam xyuas no tau ua tiav ob theem ESDD, sib xws rau thaj chaw hauv av thiab ntug hiav txwv. Rau inlandsection, 14 tshiab insulators ntawm 350 kV tsis tag nrho sib npaug
kev ua tau zoo ntawm 12 ntawm cov qub insulators ntawm 250 kV. Tsis tas li ntawd, txoj kev tshawb fawb txog kab overvoltage tau pom tias 14 cov insulators yuav tsis ua tau raws li cov qauv tsim rau kev hloov surge withstandperformance. Yog li ntawd, 15 insulators tau siv nyob rau hauv seem ntawd
Cov kab tau rov ua dua tshiab siv cov porcelaininsulators nrog qhov kev ncua deb ntawm 54 hli rau ib lub disc thiab qhov sib nrug ntawm 170 hli, uas ua rau muaj qhov nkag mus rau txoj hlua ntev ntawm 3.2. Cov cheeb tsam ntug hiav txwv, muaj ESDD qib ntawm 0.12 mg / cm2 yuav tsum muaj cov hlua hluav taws xob muaj 33discs thaum sab hauv av, nrog ESDD qib ntawm 0.01mg / cm2, xav tau cov hlua ntawm 15 discs.
Tam sim no, Transpower tau hloov ntau qhov qub porcelain insulators nrog iav. Tsis tas li ntawd, nyob rau hauv lub xyoo dhau los, silicone composite thiab silicone-coated iav insulators tau raug txiav txim siab los txhim kho kev ua qias tuaj hauv ntug dej hiav txwv tom qab kev ua tsis tiav nrog cov khoom siv EPDM. Piv txwv li, EPDM insulators ntsia rau ntawm Transpower'sHVDC kab tau pom qhov me me yaig ntawm qhov sib cuam tshuam nrog qhov txias -endfittings, shed punctures raws lub insulator ntev thiab cov kab nrib pleb tseem ceeb ntawm cov tub ntxhais qws vaj tse nyob ze rau qhov kawg fittings.
IEC 608154 nthuav qhia ib txoj hauv kev yooj yim rau kev txiav txim siab USCD xav tau ntawm DC insulators raws li CIGRE TB 518 Cov Lus Qhia. Raws li tus qauv no, qhov tseeb tshaj plaws kom tau txais cov ntaub ntawv ntawm qhov chaw hnyav yog kom tau txais cov ntaub ntawv ncaj qha los ntawm kev ua haujlwm ntawm DC kab. ESDD qhov tseem ceeb ntsuas ntawm lub zog porcelain insulators yuav tsum raug kho kom txiav txim siab qhov chaw muaj kuab paug yog tias tus neeg sib tw insulator txawv ntawm cov ntaub ntawv pov thawj. Yog li no, Transpower tam sim no siv cov lus qhia kho IEC los txiav txim USCDdc rau HTM thiab tsis yog -HTMinsulators uas tsis yog cov porcelain insulators siv rau kev ntsuas ESDD.
Cov ntaub ntawv siv dc UCSD (RUUSCDdc) tau txiav txim siab thiab kho rau tus neeg sib tw iav (tsis yog -HTM) thiab silicone composite (HTM) insulators kom tau txais USCD xav tau rau txhua tus neeg sib tw. IEC 60815-4 Kev sib npaug sib npaug ntawm qhov kev siv creepage nrug rau kev ua qias tuaj rau kev ua qias tuaj nyob rau hauv IEC 60815-4:
Qhov twg B thiab yog qhov txawv txav ntawm qhov sib txawv rau txhua hom insulator thiab yog qhov ua rau muaj kuab paug tshwm sim ntawm ESDD rau hom A muaj kuab paug thiab qhov chaw sib npaug salinity, SES, rau typeB pollution.
Siv iav insulator units nrog 170 mmspacing thiab 550 mm creepage nrug, yuav tsum muaj 44-disc insulator hlua rau cov cheeb tsam ntug dej hiav txwv. Tus naj npawb ntawm cov discs yuav txo mus rau 35 siv insulator units nrog 190 hli qhov nrug thiab 690 hli creepage nrug. Cov lej no ua rau lub qhov ntev ntawm qhov ntev ntawm 6.6 txog 7.5 meters.
Txij li cov kab hluav taws xob sib txuas tsis tau hloov kho tag nrho rau qhov ntsuas qhov ntsuas hluav taws xob (tshwj tsis yog rau 24 cov qauv), cov insulators ntev tsis tuaj yeem haum rau hauv cov duab geometry saum toj kawg nkaus ntawm cov lattice towers uas twb muaj lawm yam tsis tau ua txhaum qhov yuav tsum tau muaj hluav taws xob clearances.Tam sim no, ob lub iav insulator hlua (33 units ntawm 170 mm spacing) thiab composite insulators .26 mm ntev (NGK) raug ntsia rau ntawm qhov sib txawv ntawm cov kab sib kis. Kev ua qias tuaj ntawm silicone composite insulators tau txaus siab.Txawm li cas los xij, qhov ntev -kev ua tau zoo ntawm cov insulators no yuav tsum tau saib xyuas.
Lwm qhov kev sib tw yog qhov highcorrosivity Performance index raws txoj kab txoj kev, uas yuav tsum tau ib tug zinc dab tshos tom kawg haum ntawm composite insulators. Kev ua haujlwm tsis zoo ntawm cov insulators yav dhau los (tsuas yog cov plooj (porcelain thiab EPDM) feem ntau) hauv cov cheeb tsam ntug dej hiav txwv ua ke nrog cov teeb meem cuam tshuam nrog kev ua kom haum lub iav ntev insulator txoj hlua mus rau hauv cov pej thuam saum toj kawg nkaus geometry thiab tsis paub tseeb txog kev ua qias tuaj ntawm kev teeb tsa silicone composite insulators tag nrho ua rau kev txiav txim siab saib xyuas kev ua haujlwm ntawm cov insulators. Txij lub Tsib Hlis 2002 txog rau Lub Rau Hli 2003, Transpower tau ua 12-hli kev pab cuam ntawm 15 AC substation qhov chaw los ntsuas qhov cuam tshuam ib puag ncig ntawm txhua tus. Cov kev ntsuam xyuas no suav nrog kev ntsuas plua plav txhua hli nrog rau qhov tseeb txhua hli, 3, 6, thiab 12 lub hlis sib npaug ntawm cov ntsev tso nyiaj ntom ntom ntsuas los ntawm kev ntsuas qhov dej ntawm qhov chaw.
Xyoo 2019, Transpower pib ntsuas qhov dej ntws tawm ntawm DC energized silicone coated iav thiab cov insulators sib xyaw.Kuj, DDDG txhua hli thiab ntsuas cua pib thaum lub Cuaj Hli 2019.
Mus koom lub 2022 INMR Ntiaj Teb Kev Sib Tham hauvBerlin qhov chaw Transmission Design Engineer, Kamran Rezaei ntawm Transpower, yuav tshuaj xyuas cov kev pabcuam nrog cov qauv insulator sib txawv ntawm New Zealand'sHVDC kis kab mob. Nws tseem yuav piav qhia txog yuav ua li cas saib xyuas cov dej xau tam sim no ntawm cov iav insulators tau tso cai rau kev ntsuam xyuas seb hydrophobicity canallow txo qhov kev ncua deb ntawm cov hlua los ntawm kev sib txuas cov ntaub ntawv los ntawm kev tshawb fawb nrog rau txoj hauv kev ntawm IEC 60815-4.
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