Izindaba

Ngaphezu kwalokho, izinhlobo ezikhunjulwa e-Australia nazo zihlanganisa:

Ukushintshwa kwe-DC kwe-GWR PTY LTD Trading as Uniquip Industries kwabuyiselwa emuva ngenxa yokushisa ngokweqile nomlilo: http://www.recalls.gov.au/content/index.phtml/itemId/1060436

Iswishi ye-DC ye-NHP Electrical Engineering Product Pty Ltd, isizathu sokukhumbula ukuthi uma isibambo sishintshelwa kusimo sokuthi 'OFF', kodwa othintana naye uhlala esesimweni sokuthi 'ON', futhi iswishi ayikwazi ukuvalwa: http: //www.recalls.gov.au/ content/index.phtml/itemId/1055934

Njengamanje, kuningi okubizwa ngokuthi ama-circuit breaker emakethe okungewona ama-circuit breaker e-DC wangempela, kodwa athuthukisiwe kusuka kuma-circuit breaker e-AC.Amasistimu we-Photovoltaic ngokuvamile ane-voltage yokunqamula ephezulu uma kuqhathaniswa neyamanje.Uma kwenzeka iphutha lomhlabathi, umthamo ophezulu we-short-circuit current uzodonsa othintana nabo ndawonye, ​​​​okuholela ekutheni kube nomthamo we-short-circuit ephakeme kakhulu, engaba phezulu njenge-kiloamps (kuye ngokuthi imikhiqizo ehlukene).Ikakhulukazi ezinhlelweni ze-photovoltaic, kuvamile ukuba ne-multiple parallel input of solar panel noma okokufaka okuzimele kwama-solar panel amaningi.Ngale ndlela, kuyadingeka ukusika okokufaka kwe-DC okuhambisanayo kwamaphaneli elanga amaningi noma okokufaka kwe-DC okuzimele kwamaphaneli elanga amaningi ngesikhathi esisodwa.Ikhono lokucima i-arc lokushintshwa kwe-DC kulezi zimo Izidingo zizoba phezulu, futhi ukusetshenziswa kwalezi ziphazamisi zesifunda se-DC ezithuthukisiwe ezinhlelweni ze-photovoltaic kuzoba nezingozi ezinkulu.

Ukukhethwa okulungile kwezindinganiso ezimbalwa zokushintshwa kwe-DC

Ungakhetha kanjani inkinobho efanele ye-DC yesistimu ye-photovoltaic?Amazinga alandelayo angasetshenziswa njengereferensi:

1. Zama ukukhetha amabhrendi amakhulu, ikakhulukazi lawo aphumelele izitifiketi zomhlaba wonke.

Ama-circuit breaker e-Photovoltaic DC anesitifiketi saseYurophu i-IEC 60947-3 (izinga elivamile laseYurophu, elilandelwa amazwe amaningi ase-Asia-Pacific), i-UL 508 (izinga elijwayelekile laseMelika), i-UL508i (Indinganiso yaseMelika yokushintsha kwe-DC yezinhlelo ze-photovoltaic), i-GB14048.3 (i-Domestic General Standard), i-CAN/CSA-C22.2 (i-Canadian General Standard), i-VDE 0660. Njengamanje, izinhlobo ezinkulu zamazwe ngamazwe zinazo zonke izitifiketi ezingenhla, njenge-IMO e-United Kingdom kanye ne-SANTON e-Netherlands.Iningi lemikhiqizo yasekhaya njengamanje lidlula kuphela indinganiso ye-IEC 60947-3.

2. Khetha i-DC circuit breaker enomsebenzi omuhle wokucisha i-arc.

Umphumela wokucisha i-arc ungenye yezinkomba ezibaluleke kakhulu zokuhlola ukushintshwa kwe-DC.Ama-circuit breaker e-Real DC anemishini ekhethekile yokucisha i-arc, engacishwa uma ilayishiwe.Ngokuvamile, ukwakheka kwesakhiwo se-real DC breaker sikhethekile.Isibambo kanye noxhumana naye akuxhunyiwe ngokuqondile, ngakho-ke lapho inkinobho ivuliwe futhi ivaliwe, othintana naye akajikeleziswanga ngokuqondile ukuze anqamule, kodwa isiphethu esikhethekile sisetshenziselwa uxhumano.Uma isibambo sizungezisa noma siya endaweni ethile, bonke othintana nabo baqalwa "ukuvuleka kungazelelwe", ngaleyo ndlela kukhiqize isenzo sokuvala esisheshayo, okwenza i-arc ihlale ifushane.Ngokuvamile, i-arc ye-photovoltaic DC switch yomugqa wokuqala wamazwe ngamazwe icima phakathi kwama-millisecond ambalwa.Isibonelo, isistimu ye-SI ye-IMO ithi i-arc icima phakathi kwama-millisecond angu-5.Kodwa-ke, i-arc ye-DC circuit breaker eshintshwe yi-AC circuit breaker evamile ihlala ngaphezu kwama-millisecond angu-100.

3. Ukumelana ne-voltage ephezulu kanye namanje.

I-voltage yesistimu ye-photovoltaic evamile ingase ifinyelele ku-1000V (600V e-United States), futhi yamanje okudingeka inqanyulwe incike ohlotsheni namandla emojula, kanye nokuthi isistimu ye-photovoltaic ixhunywe ngokuhambisana yini noma ngoxhumo oluzimele oluningi ( i-MPPT eneziteshi eziningi).I-voltage ne-current ye-switch ye-DC kunqunywa i-voltage yentambo kanye ne-parallel current ye-photovoltaic array edinga ukunqanyulwa.Bheka isipiliyoni esilandelayo lapho ukhetha ama-photovoltaic DC circuit breaker:

I-Voltage = NS x VOC x 1.15 (Isibalo 1.1)

Okwamanje = NP x ISC x 1.25 (Ifomula 1.2)

Lapho i-NS-inombolo yamaphaneli ebhethri ochungechungeni lwe-NP-inani lamaphakethe ebhethri ngokuhambisana

Iphaneli yebhethri ye-VOC-voltage evulekile yesekethe

I-ISC-isifunda esifushane samanje sephaneli yebhethri

1.15 kanye no-1.25 ama-empirical coefficients

Ngokuvamile, amaswishi e-DC ezinhlobo ezinkulu anganqamula ugesi wesistimu we-DC ongu-1000V, futhi aklame ukunqamula okokufaka kwe-DC okungu-1500V.Izinhlobo ezinkulu zokushintshwa kwe-DC zivame ukuba nochungechunge lwamandla aphezulu.Isibonelo, ukushintshwa kwe-photovoltaic DC ye-ABB kunamakhulu emikhiqizo yochungechunge lwe-ampere.I-IMO igxile ekushintsheni kwe-DC kumasistimu we-photovoltaic asabalalisiwe futhi ingahlinzeka ngokushintsha kwe-50A, 1500V DC.Kodwa-ke, abanye abakhiqizi abancane ngokuvamile bahlinzeka ngokushintsha kwe-16A, 25A DC kuphela, futhi ubuchwepheshe bayo nobuchwepheshe kunzima ukukhiqiza amaswishi e-photovoltaic DC enamandla amakhulu.

4. Imodeli yomkhiqizo iphelele.

Ngokuvamile, izinhlobo ezinkulu zokushintshwa kwe-DC zinamamodeli ahlukahlukene angahlangabezana nezidingo zezikhathi ezahlukahlukene.Kukhona amatheminali angaphandle, akhelwe ngaphakathi angahlangabezana nokufaka okuningi kwe-MPPT ngochungechunge nokuhambisana, okukhiyiwe nangaphandle kwayo, nokwanelisa kakhudlwana.Ukufakwa okuhlukahlukene Izindlela ezinjengokufakwa kwesisekelo (kufakwe ebhokisini lesihlanganisi nekhabhinethi yokusabalalisa amandla), ukufakwa kwembobo eyodwa kanye nokufakwa kwamaphaneli, njll.

5. Izinto ezisetshenziswayo azikwazi ukumelana nelangabi futhi zinezinga eliphezulu lokuvikela.

Ngokuvamile, izindlu, impahla yomzimba, noma isibambo sokushintsha kwe-DC konke kuyipulasitiki, enezici zayo zokunqanda amalangabi futhi ngokuvamile ingahlangabezana nezinga le-UL94.Ikesi noma umzimba weswishi yekhwalithi enhle ye-DC ingahlangabezana nezinga le-UL 94V0, futhi isibambo ngokuvamile sihlangabezana nezinga le-UL94 V-2.

Okwesibili, ekushintsheni kwe-DC eyakhelwe ngaphakathi ngaphakathi kwe-inverter, uma kukhona isibambo sangaphandle esingashintshwa, izinga lokuvikela lokushintsha ngokuvamile liyadingeka ukuze okungenani lihlangabezane nezidingo zokuhlola zezinga lokuvikela lomshini wonke.Njengamanje, ama-inverter ezintambo asetshenziswa kakhulu embonini (ngokuvamile angaphansi kwezinga lamandla angu-30kW) ngokuvamile ahlangabezana nezinga lokuvikela le-IP65 lawo wonke umshini, okudinga ukushintshwa kwe-DC eyakhelwe ngaphakathi kanye nokucinana kwephaneli uma umshini ufakiwe. .Kumaswishi e-DC angaphandle, uma efakwe ngaphandle, adingeka ukuthi ahlangabezane okungenani nezinga lokuvikela le-IP65.