Is féidir brúití circeach AC agus DC a úsáid ina n-áite?

Réimse: Anailís Anatriantóir

China

Ar dtús, ní mór a chur i gcuimhne: ní mian leis go mbeadh briseoirí circe AC á n-úsáid in ionad briseoirí circe DC i gciorcalá DC!

DC circuit breakers

Mar gheall ar éagsúlachtaí idir an próiseas cruthaithe agus scriosachán arc idir AC agus DC, níl cumas cothroime ag briseoirí circe AC agus DC le luachanna rádaithe comhionann nuair a dhéantar scriosachán ar fhuinneamh DC. Is ceann de na príomhchúrsaí do mhisteidiú cosaint agus triapú neamhdhírithe tuarastal an tús úsáid briseoirí circe AC in ionad briseoirí DC, nó meascadh briseoirí AC agus DC.

Úsáideann briseoirí circe meicniúm triapaithe teirmeach-maighnéadaigh (maighnéadach) le hoperáid sheandromach. Is é an paraiméadar príomha a thionchar ar an gtriapú an réitse corra atá ag gluaiseacht trí an briseoir. Tá an luach rádaithe ag an briseoir ag tagairt don luach RMS (root mean square), áfach is airde an réiteas corra AC ná a luach RMS (thart ar 1.4 uaire). Faoin suíomh cothrom, má úsáideann tú briseoir circe AC i gciorcalá DC, beidh an réiteas triapaithe fíor-thiarnach níos airde ná mar a bheadh le briseoir DC. Nuair a tharlaíonn ollmhais, d'fhéadfadh an briseoir áitiúil gan triapú, agus an briseoir tuarastal ag triapú ina ionad—seo a bhfuil ar eolas mar "triapú os cionn an leibhéal." Chomh maith leis sin, mar gheall ar éagsúlachtaí idir na bunphrionscail sriostacháin arc, is deacair níos mó sriostú arc DC ná arc AC. Tá briseoirí DC mar sin dírithe le forálacha sriostacháin arc níos airde. Ní féidir le briseoir circe AC a úsáid i gciorcalá DC sriostú go héifeachtach nó go rialta an arc DC, rud a thabharfaidh go cinnte chuig sriochadh príomh-teagmhais an tréimhse seo.

Ón mbeocht, tá sé soiléir nach mian leis go mbeadh briseoirí circe AC agus DC á n-úsáid ina choinne. Sa bhunchloch, dá mba universal i ndáiríre briseoirí circe AC agus DC, cén fáth a bheadh dearcadh idir iad ar chor ar bith?

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