Nkhani

Kuphatikiza apo, mitundu yomwe idakumbukiridwa ku Australia imaphatikizanso:

Kusintha kwa DC kwa GWR PTY LTD Trading monga Uniquip Industries kunakumbukiridwa chifukwa cha kutentha kwambiri ndi moto: http://www.recalls.gov.au/content/index.phtml/itemId/1060436

Kusintha kwa DC kwa NHP Electrical Engineering Product Pty Ltd, chifukwa chokumbukira ndikuti chogwiriracho chikasinthidwa kukhala 'OFF', koma cholumikiziracho chimakhala cha 'ON' nthawi zonse, ndipo chosinthira sichingazimitsidwe: http: //www.recalls.gov.au/ content/index.phtml/itemId/1055934

Pakali pano, pali ambiri otchedwa DC circuit breakers pamsika omwe si enieni ophwanya dera la DC, koma amapangidwa bwino kuchokera ku AC circuit breakers.Makina a Photovoltaic nthawi zambiri amakhala ndi magetsi otsika kwambiri komanso apano.Pakakhala vuto la pansi, mphamvu yachidule yothamanga kwambiri idzakokera ogwirizanitsa pamodzi, zomwe zimapangitsa kuti pakhale phokoso laling'ono kwambiri, lomwe likhoza kukhala la kiloamps (malingana ndi mankhwala osiyanasiyana).Makamaka m'makina a photovoltaic, zimakhala zofala kukhala ndi maulendo angapo ofananirako a ma solar panels kapena kuyika pawokha pazitsulo zambiri za dzuwa.Mwanjira imeneyi, ndikofunikira kudula kuyika kwa DC kofananira ndi ma solar angapo kapena ma DC odziyimira pawokha a ma solar angapo nthawi imodzi.Kukhoza kuzimitsa kwa arc kwa ma switch a DC muzochitika izi Zofunikira zidzakhala zapamwamba, ndipo kugwiritsa ntchito magetsi oyendetsa magetsi a DC mu machitidwe a photovoltaic adzakhala ndi zoopsa zambiri.

Kusankhidwa kolondola kwamiyezo ingapo yama switch a DC

Momwe mungasankhire kusintha koyenera kwa DC kwa photovoltaic system?Miyezo yotsatirayi ingagwiritsidwe ntchito ngati zofotokozera:

1. Yesani kusankha mitundu yayikulu, makamaka yomwe yadutsa ziphaso zapadziko lonse lapansi.

Photovoltaic DC circuit breakers makamaka ndi European certification IEC 60947-3 (European wamba muyezo, akutsatiridwa ndi mayiko ambiri Asia-Pacific), UL 508 (American General muyezo), UL508i (American muyezo kwa DC masiwichi kwa kachitidwe photovoltaic), GB14048.3 (Domestic general Standard), CAN/CSA-C22.2 (Canadian General Standard), VDE 0660. Pakalipano, makampani akuluakulu apadziko lonse ali ndi zidziwitso zonse pamwambapa, monga IMO ku United Kingdom ndi SANTON ku Netherlands.Mitundu yambiri yapakhomo pano imangodutsa muyezo wapadziko lonse wa IEC 60947-3.

2. Sankhani chowombera cha DC chokhala ndi ntchito yabwino yozimitsa arc.

Kuzimitsa kwa arc ndi chimodzi mwazizindikiro zofunika kwambiri pakuwunika ma switch a DC.Ophwanya ma circuit Real DC ali ndi zida zapadera zozimitsira arc, zomwe zimatha kuzimitsidwa pakunyamula.Nthawi zambiri, mapangidwe amagetsi enieni a DC ndi apadera kwambiri.Chogwirizira ndi cholumikizira sichimalumikizidwa mwachindunji, kotero pomwe chosinthiracho chimayatsidwa ndikuzimitsa, kukhudzana sikumazunguliridwa mwachindunji kuti kuthetse, koma kasupe wapadera amagwiritsidwa ntchito polumikizana.Chogwirira chikazungulira kapena kupita kumalo enaake, ma arc onse amayamba "kutseguka mwadzidzidzi", zomwe zimapangitsa kuti arc ikhale yaufupi kwambiri.Nthawi zambiri, arc ya photovoltaic DC switch ya mtundu woyamba wapadziko lonse lapansi imazimitsidwa mkati mwa ma milliseconds ochepa.Mwachitsanzo, SI system ya IMO imati arc imazimitsidwa mkati mwa 5 milliseconds.Komabe, arc ya DC circuit breaker yosinthidwa ndi general AC circuit breaker imatha kupitilira ma milliseconds 100.

3. Kupirira voteji mkulu ndi panopa.

Mphamvu yamagetsi yamtundu wa photovoltaic imatha kufika ku 1000V (600V ku United States), ndipo zamakono zomwe zimayenera kutsekedwa zimadalira mtundu ndi mphamvu ya gawoli, komanso ngati photovoltaic system imagwirizanitsidwa mofanana kapena maulendo angapo odziimira ( ma MPPT ambiri).Mphamvu yamagetsi ndi yapano ya switch ya DC imatsimikiziridwa ndi voteji ya chingwe ndi mphamvu yofananira ya gulu la photovoltaic lomwe likufunika kulumikizidwa.Onani zotsatirazi posankha ma photovoltaic DC circuit breakers:

Voltage = NS x VOC x 1.15 (Equation 1.1)

Panopa = NP x ISC x 1.25 (Fomula 1.2)

Kumene NS-chiwerengero cha mapanelo a batri mumndandanda wa NP-chiwerengero cha mapaketi a batri molumikizana

VOC-batire gulu lotseguka dera voteji

ISC-ifupi yozungulira pano pagulu la batri

1.15 ndi 1.25 ndi epirical coefficients

Nthawi zambiri, ma switch a DC amitundu yayikulu amatha kulumikiza ma voliyumu a DC a 1000V, ngakhalenso kupanga kuti asalumikizane ndi DC ya 1500V.Zosintha zazikulu za DC nthawi zambiri zimakhala ndi zida zamphamvu kwambiri.Mwachitsanzo, ma switch a ABB a photovoltaic DC ali ndi mazana amtundu wa ampere.IMO imayang'ana kwambiri ma switch a DC pamakina ogawa ma photovoltaic ndipo imatha kupereka ma switch a 50A, 1500V DC.Komabe, opanga ena ang'onoang'ono nthawi zambiri amapereka ma switch a 16A, 25A DC, ndipo ukadaulo wake ndiukadaulo wake ndizovuta kupanga ma switch amphamvu kwambiri a photovoltaic DC.

4. Chitsanzo cha mankhwala ndi chathunthu.

Nthawi zambiri, ma switch akulu a DC amakhala ndi mitundu yosiyanasiyana yomwe imatha kukwaniritsa zosowa zanthawi zosiyanasiyana.Pali zotsekera zakunja, zomangidwira, zomwe zimatha kukumana ndi zolowetsa zambiri za MPPT motsatizana komanso zofananira, zokhala ndi zotsekera, komanso zokhutiritsa.Kuyika kosiyanasiyana Njira monga kukhazikitsa koyambira (kuyika mu bokosi lophatikizira ndi kabati yogawa magetsi), dzenje limodzi ndi kukhazikitsa mapanelo, ndi zina.

5. Zinthuzi siziwotchera moto ndipo zimakhala ndi chitetezo chokwanira.

Nthawi zambiri, nyumba, zida zamthupi, kapena chogwirira cha ma switch a DC onse ndi pulasitiki, yomwe ili ndi mawonekedwe ake osayaka moto ndipo nthawi zambiri imatha kukwaniritsa mulingo wa UL94.Chophimba kapena thupi la chosinthira chabwino cha DC chimatha kukumana ndi muyezo wa UL 94V0, ndipo chogwiriracho chimakumana ndi muyezo wa UL94 V-2.

Kachiwiri, kwa chosinthira cha DC chomangidwa mkati mwa inverter, ngati pali chogwirira chakunja chomwe chingasinthidwe, mulingo wachitetezo cha switch nthawi zambiri umafunika kuti ukwaniritse zofunikira zoyeserera zachitetezo cha makina onse.Pakadali pano, makina osinthira zingwe omwe amagwiritsidwa ntchito kwambiri pamakampani (nthawi zambiri osakwana 30kW mphamvu yamagetsi) nthawi zambiri amakumana ndi chitetezo cha IP65 pamakina onse, omwe amafunikira chosinthira cha DC chokhazikika komanso kulimba kwa gululo akayika makinawo. .Kwa ma switch akunja a DC, ngati ayikidwa panja, amayenera kukwaniritsa osachepera IP65 chitetezo.