Iindaba

I. Intshayelelo: Isidingo Esingxamisekileyo Sokhuseleko Kwiimeko ze-DC Eziphezulu Ze-Voltage kunye nexabiso eliPhambili le-DC Isolation Switch

Ngenxa yophuhliso olukhawulezileyo lwamandla amatsha, iinkqubo ze-DC ezine-voltage ephezulu (i-HVDC) zisetyenziswa kakhulu kwi-photovoltaic (PV), kwindawo yokugcina amandla kunye nokuhamba ngololiwe. Ukusebenza kwazo ngokukhuselekileyo kubalulekile, njengoko ulwalathiso lwangoku oluzinzileyo lwe-HVDC kunye nokungabikho kwendlela yendalo yokunqumla i-zero kwenza ukuba ukhuselo lokwahlukanisa kunye neempazamo lube nzima. Izixhobo zokwahlukanisa ezisebenzayo nezithembekileyo zibalulekile ke ngoko.

Njengesixhobo esibalulekileyo sokukhusela i-HVDC,Iswitshi yokuzahlula yeDC(i-DC disconnect switch) iyazahlula ngokwasemzimbeni iisekethe, inqumle iimpazamo, kwaye iqinisekise ukhuseleko. Ngokungafaniyo nee-AC switches, yenzelwe ngokukodwa ii-DC arcs ezinzima ukuzicima, kwaye ukusebenza kwayo phantsi kombane ophezulu kumisela ngokuthe ngqo amanqanaba okhuseleko lwenkqubo.

Eli nqaku lichaza kabanzi malungaIswitshi yokuzahlula yeDCukusebenza kunye nokuthembeka kwayo, ihlalutya ixabiso layo eliphambili ekukhuseleni i-HVDC ukuze ikhokele ukhetho lwesicelo.

II. Uphuhliso Lokusebenza: Ukuziqhelanisa Neemeko Eziphezulu ZeVolthi

Iimeko ze-HVDC zifuna ukusebenza kweswitshi yokuzihlukanisa ephezulu, kubandakanya ukunyamezelana kwe-voltage ephezulu kunye nokunciphisa i-arc ngokufanelekileyo. I-DC Isolation Switch ifezekisa impumelelo ezimbini ukuhlangabezana nezi mfuno.

Kwi-high-voltage tolerance, isizukulwana esitsha sine-structure kunye ne-material upgrades, ezilungelelaniswa ne-1500VDC nangaphantsi (kwaye ziphezulu kwiiprojekthi ezikhethekileyo). I-insulation enamandla aphezulu kunye ne-contacts ezilungiselelweyo zithintela ukuqhekeka. Ngokwe-"Special Standards and Certification Requirements for DC Isolation Switches for Photovoltaic Applications", ii-IEC 60947-3 compliant switches zisebenza ngokuzinzileyo kwi-voltage elinganisiweyo, kunye nokunyuka kobushushu be-copper conductor ≤60K.

Ukuze kuphulwe ukusebenza kakuhle, ukucima i-arc ye-magnetic blow arc ephucukileyo kunye nokuphulwa kwe-multi-point ngokukhawuleza kucinezela ii-arc ze-DC (ezingenayo i-zero-crossing yendalo). Umzekelo, ii-switches ze-ABB Emax series zifezekisa ukuphulwa okukhuselekileyo kwe-1500V DC / 100kA, ziphepha iimpazamo.

Olu hlaziyo luphula imida yesiqhelo yokutshintsha, luqinisekisa ukusebenza ngokukhuselekileyo kweeprojekthi ze-HVDC.

III. Ukuphuculwa kokuthembeka: Uzinzo lwexesha elide

Ngaphaya kokusebenza kakuhle, i-DC Isolation Switch entsha iphucula ukuthembeka, isombulula ubomi obufutshane benkonzo kunye neengxaki zokugcinwa okuphezulu kwiimeko ezinzima.

Izixhobo zokunxibelelana ezigugileyo kunye nothumelo oluphuculweyo zandisa ubomi boomatshini ukuya kwimisebenzi engaphezu kwe-10,000, nto leyo enciphisa ukugcinwa kunye neendleko—zilungele iiprojekthi ezinkulu ze-PV kunye nokugcinwa kwamandla.

Ngokhuseleko lwe-IP66, iyamelana namaqondo obushushu agqithisileyo (-40℃ ukuya kuma-85℃), ukufuma kunye nokutshiza ngetyuwa, okuqinisekisa ukusebenza okuzinzileyo ngaphandle/kwimizi-mveliso.

Ikwahlangabezana nemigangatho ye-IEC 60947-3 kunye ne-GB/T 14048.3, iqinisekisa ukhuseleko kunye nokuthotyelwa kwemithetho.

IV. Uhlengahlengiso olupheleleyo lweMeko

Ngokusebenzisa iindlela ezimbini zokuphucula, i-DC Isolation Switch isetyenziswa kakhulu kwiindawo eziphambili ze-HVDC: amacala e-DC esityalo se-PV (ukwahlulwa ngexesha lokugcinwa), iinkqubo zokugcina amandla (ukwahlulwa kwebhetri-converter), kunye nezixhobo zamandla ze-DC zokuthutha ngololiwe/industrial (ukusika iimpazamo).

Iingxelo ze-V.

1. “Imigangatho Ekhethekileyo Neemfuno Zesatifikethi See-DC Isolation Switches Zezicelo Ze-Photovoltaic” — Umbutho WezoShishino Lwezixhobo Zombane waseTshayina

2. I-IEC 60947-3 Standard: Iswitshi ye-voltage ephantsi kunye ne-controlgear — Icandelo 3

3. Incwadi yeMveliso yokutshintsha i-ABB Emax Series DC Isolation Switch

VI. Imibuzo Ebuzwa Rhoqo

Umbuzo 1: Yintoni umahluko ophambili phakathi kweeswitshi ze-DC kunye neze-AC zokwahlukanisa? A1: Iiswitshi ze-DC zisebenzisa i-arc-extinguishing ekhethekileyo (umz., i-magnetic blow) kwii-DC arcs ezinzima ukuzicima; iiswitshi ze-AC zixhomekeke kwi-AC arc zero-crossing.

Umbuzo 2: Ngawaphi amanqanaba ombane enokuyitshintsha? A2: 1500VDC nangaphantsi; ezinye iimveliso zixhasa amanqanaba aphezulu kwiiprojekthi ezikhethekileyo.

Umbuzo 3: Ungaqinisekisa njani ukuthembeka kwiindawo ezinzima? A3: Ukhuseleko lwe-IP66, izixhobo ezimelana nokugqwala kunye nesakhiwo esilungisiweyo simelana neemeko ezinzima.