Iindaba

Ukongeza, iibrendi ezikhunjulwayo eOstreliya zibandakanya:

Ukutshintsha kwe-DC ye-GWR PTY LTD Trading as Uniquip Industries kwaye kwakhunjulwa ngenxa yobushushu obugqithiseleyo kunye nomlilo: http://www.recalls.gov.au/content/index.phtml/itemId/1060436

I-NHP Electrical Engineering Product Pty Ltd's iswitshi ye-DC, isizathu sokukhumbula kukuba xa isiphatho sitshintshelwa kwimeko ye-'OFF', kodwa uqhagamshelwano luhlala lukwimo ye-'ON', kwaye iswitshi ayinako ukucinywa: http: //www.recalls.gov.au/ content/index.phtml/itemId/1055934

Okwangoku, kukho izinto ezininzi ezibizwa ngokuba ngabaphuli beesekethe ze-DC kwimarike ezingezizo ezokwenyani ze-DC, kodwa ziphuculwe ukusuka kwi-AC zesekethe.Iinkqubo ze-Photovoltaic ngokubanzi zine-voltage ephezulu yokuqhawula kunye neyangoku.Kwimeko yesiphoso somhlaba, i-high short-circuit current iya kutsala abafowunelwa ndawonye, ​​​​okubangele umbane ophezulu kakhulu we-short-circuit current, onokuthi ube phezulu njenge-kiloamps (kuxhomekeke kwiimveliso ezahlukeneyo).Ngokukodwa kwiinkqubo ze-photovoltaic, kuqhelekile ukuba negalelo elilinganayo leepaneli zelanga okanye igalelo elizimeleyo leepaneli ezininzi zelanga.Ngale ndlela, kuyimfuneko ukunqumla igalelo le-DC elihambelanayo leepaneli ezininzi zelanga okanye igalelo le-DC elizimeleyo leepaneli ezininzi zelanga ngexesha elinye.Ikhono lokucima i-arc yokutshintsha kwe-DC kwezi meko Iimfuno ziya kuba phezulu, kwaye ukusetyenziswa kwezi ziphuculweyo ze-DC zesiphaluka kwiinkqubo ze-photovoltaic ziya kuba nemingcipheko enkulu.

Ukhetho oluchanekileyo lwemigangatho emininzi yokutshintsha kweDC

Indlela yokukhetha i-DC echanekileyo yokutshintsha inkqubo ye-photovoltaic?Le migangatho ilandelayo ingasetyenziswa njengereferensi:

1. Zama ukukhetha iimpawu ezinkulu, ngakumbi ezo ziphumelele isatifikethi samazwe ngamazwe.

Photovoltaic DC izaphuli zesekethe ikakhulu isiqinisekiso yaseYurophu IEC 60947-3 (umgangatho eqhelekileyo yaseYurophu, ilandelwa ngamazwe amaninzi Asia-Pacific), UL 508 (American jikelele standard), UL508i (American standard for DC swiwis for photovoltaic systems), GB14048.3 (uMgangatho oqhelekileyo wasekhaya), CAN/CSA-C22.2 (uMgangatho Jikelele waseKhanada), iVDE 0660. Okwangoku, iimpawu ezinkulu zamazwe ngamazwe zinazo zonke iziqinisekiso ezingentla, ezifana ne-IMO e-United Kingdom kunye ne-SANTON e-Netherlands.Uninzi lweempawu zasekhaya okwangoku zidlula kuphela umgangatho we-IEC 60947-3.

2. Khetha i-DC circuit breaker enomsebenzi wokucima i-arc elungileyo.

Impembelelo yokucima i-arc yenye yezona zibonakaliso ezibalulekileyo zokuvavanya ukutshintsha kwe-DC.Izaphuli zesekethe zangempela ze-DC zinezixhobo ezikhethekileyo zokucima i-arc, ezinokucinywa kumthwalo.Ngokubanzi, uyilo loyilo lwe-DC yokwenyani ibreaker lukhethekile.Isibambo kunye noqhagamshelwano aluxhunyiwe ngokuthe ngqo, ngoko ke xa utshintsho luvuliwe kwaye luvaliwe, umnxibelelwano awujikelezi ngokuthe ngqo ukuqhawula, kodwa intwasahlobo ekhethekileyo isetyenziselwa ukudibanisa.Xa isiphatho sijikeleza okanye sihamba kwindawo ethile, bonke abafowunelwa baqhutyelwa ukuba "bavule ngokukhawuleza", ngaloo ndlela bavelise isenzo esikhawulezayo sokuvala, okwenza ukuba i-arc ihlale ixesha elifutshane.Ngokuqhelekileyo, i-arc ye-photovoltaic yokutshintsha kwe-DC ye-brand yokuqala yamazwe ngamazwe icinyiwe kwii-millisecond ezimbalwa.Ngokomzekelo, inkqubo ye-SI ye-IMO ithi i-arc icinyiwe ngaphakathi kwe-5 millisecond.Nangona kunjalo, i-arc ye-DC ye-circuit breaker eguqulelwe yi-AC jikelele i-breaker breaker ihlala ngaphezu kwe-100 milliseconds.

3. Ukumelana nombane ophezulu kunye nombane.

I-voltage yenkqubo ye-photovoltaic jikelele inokufikelela kwi-1000V (600V e-United States), kwaye ikhoyo ngoku ekufuneka ikhutshwe ixhomekeke kwi-brand kunye namandla emodyuli, kwaye ingaba inkqubo ye-photovoltaic ixhunyiwe ngokuhambelanayo okanye ukudibanisa okuzimeleyo okuphindaphindiweyo ( MPPT yamajelo amaninzi).I-voltage kunye ne-current ye-DC switch inqunywe ngumbane wentambo kunye ne-parallel current ye-photovoltaic array efuna ukunqunyulwa.Jonga kula mava alandelayo xa ukhetha i-photovoltaic DC zezaphuli zesekethe:

Umbane = NS x VOC x 1.15 (Equation 1.1)

Okwangoku = NP x ISC x 1.25 (Ifomula 1.2)

Apho i-NS-inani leepaneli zebhetri kuthotho NP-inani leebhetri zepakethi ngokunxuseneyo

Iphaneli ye-VOC yebhetri evulekileyo yombane wesekethe

I-ISC-isiphaluka esifutshane sephaneli yebhetri

I-1.15 kunye ne-1.25 zi-empirical coefficients

Ngokubanzi, iiswitshi ze-DC zeempawu ezinkulu zinokuqhawula umbane we-DC we-1000V, kunye noyilo lokuqhawula igalelo le-DC le-1500V.Iimpawu ezinkulu zokutshintsha kweDC zihlala zinothotho lwamandla aphezulu.Umzekelo, iiswitshi ze-ABB ze-photovoltaic DC zinamakhulu eemveliso ze-ampere series.I-IMO igxile ekutshintsheni kwe-DC kwiinkqubo ze-photovoltaic ezisasazwayo kwaye inokubonelela nge-50A, i-1500V ye-DC switch.Nangona kunjalo, abanye abavelisi abancinci ngokubanzi babonelela kuphela nge-16A, i-25A yokutshintsha kwe-DC, kwaye iteknoloji yayo kunye nobuchwepheshe kunzima ukuvelisa i-high-power photovoltaic switches ye-DC.

4. Imodeli yemveliso igqityiwe.

Ngokubanzi, iimpawu ezinkulu zokutshintsha kweDC zineemodeli ezahlukeneyo ezinokuhlangabezana neemfuno zezihlandlo ezahlukeneyo.Kukho zangaphandle, ezakhelwe ngaphakathi, iitheminali ezinokuhlangabezana neengeniso ezininzi zeMPPT kuthotho kunye nokuhambelana, kunye nangaphandle kokutshixa, kunye nokwanelisa ngakumbi.Ufakelo oluhlukeneyo Iindlela ezifana nokufakwa kwesiseko (efakwe kwibhokisi yokudibanisa kunye nekhabhinethi yokusabalalisa amandla), i-single-hole kunye nokufakwa kwepaneli, njl.

5. Izinto eziphathekayo zi-flame-retardant kwaye zinezinga eliphezulu lokukhusela.

Ngokubanzi, izindlu, imathiriyeli yomzimba, okanye umqheba weeswitshi ze-DC zonke ziyiplastiki, eneempawu zayo zokunqanda amadangatye kwaye ziqhele ukuhlangabezana nomgangatho we-UL94.I-casing okanye umzimba wokutshintsha kwe-DC osemgangathweni unokuhlangabezana nomgangatho we-UL 94V0, kwaye umqheba udibana ngokubanzi nomgangatho we-UL94 V-2.

Okwesibini, ukutshintshwa kwe-DC eyakhelwe-ngaphakathi ngaphakathi kwe-inverter, ukuba kukho isiphatho sangaphandle esinokuthi sitshintshe, umgangatho wokukhusela wokutshintsha ufuneka ngokubanzi ukuba ubuncinane uhlangabezane neemfuno zokuvavanya kwinqanaba lokukhusela umatshini wonke.Okwangoku, ezona ziguquliyo zentambo ezisetyenziswa kakhulu kushishino (ngokuqhelekileyo ngaphantsi kwe-30kW inqanaba lamandla) ngokubanzi zidibana nenqanaba lokhuseleko le-IP65 lomatshini wonke, ofuna i-DC eyakhelwe-ngaphakathi iswitshi kunye nokuqina kwephaneli xa umatshini efakiwe. .Ukutshintshwa kwe-DC yangaphandle, ukuba bafakwe ngaphandle, kufuneka bahlangabezane ubuncinane nenqanaba lokukhusela i-IP65.