Low voltage circuit breaker parameters: nguva pfupi inomira ikozvino (Icw), iyi parameter inoshandiswa nei?

Nguva pfupi yekumira ikozvino (Icw):Kugona kwe acircuit breakerkutsungirira 0.05, 0.1, 0.25, 0.5 kana 1s pasina kugumburwa pamhepo yakapihwa, pfupi-circuit current, kana simba factor.
Yakatemerwa nguva yenguva pfupi yekumira ikozvino, inozivikanwawo sekuti thermal stable current, ndiyo inoshanda ikozvino iyo inopwanya wedunhu kana chimwe chishandiso chinogona kumira kwenguva pfupi yakatarwa.Saizi yaro yakaenzana neyakayerwa pfupi-yedunhu ikozvino uye nguva inowanzo 3 kana 4 masekonzi.

Icw ndiyo indekisi yekuongorora yekugadzikana kwemagetsi uye kugadzikana kwekupisa kweanotyora wedunhu murwendo rupfupi rwekunonoka.Ndeyekirasi B circuit breaker.Kazhinji, iyo shoma VALUE yeIcw ndeye:

Kana Mu≤2500A, iri 12In kana 5kA,

Kana Mu>2500A, iri 30kA

(ZVEYUW1_2000, Icw iri 400V, 50kA; yeDW45_3200, Icw iri 400V, 65kA).

Icw yakayerwa kwenguva pfupi kutsungirira ikozvino:Mugadziri anoti iyo RMS inoshivirirwa kwenguva pfupi inotsanangurwa neazvino uye nguva inogona kutorwa seRMS inoshivirirwa kune chigadzirwa kwenguva shoma, pasi pemamiriro akakodzera, kune yakazara seti yemidziyo nemagetsi emagetsi.Asi hunhu hwezvigadzirwa zvakasiyana-siyana hazvina kufanana, tsananguro yeyakayerwa yenguva pfupi yekushivirira kukosha kwazvino haizove yakangofanana, musimboti wayo ndiwo unotevera pfungwa:

• Ita shuwa kuvimbika kwesimba rekupa system;

• Pachikonzero chekuvimbisa kuvimbika kwegadziriro yemagetsi, kuchengetedzwa kwechigadzirwa chacho pachako

Kune yakaderera-voltage kugovera sisitimu, iyo yakatemerwa pfupi-yedunhu ikozvino inotarirwa neiyo pfupi-yedunhu ikozvino inogona kuitika muhurongwa panzvimbo yekuisa uye nguva iyo chigadzirwa pachayo uye zvimwe zvigadzirwa muhurongwa zvinogona kutsungirira ikozvino.

Iec60364-4-43 yakajairwa yedziviriro yepfupi yekudzivirira kwesimba rekugovera sisitimu yakataurwa zvakajeka: chero nguva muchiuno nekuda kwekupfupika kwedunhu kunokonzerwa nezvose zvazvino, haifanirwe kudarika iripo, musystem conductor haipfuure iyo inobvumirwa muganhu tembiricha. yenguva yekuzorora.

Kumaseketi mapfupi asingapfuure masekonzi mashanu, nguva (t) yekuti conductor asimuke kubva kune yakajairika kushanda kwayo tembiricha inotenderwa kusvika kune yakanyanya tembiricha inotenderwa inogona kuverengerwa nenzira inotevera:

T = (k * S/I) 2K zvinhu coefficient, S conductor nharaunda, I pfupi-circuit ikozvino kukosha.

Pamusoro, sarudza yakaderera-yekudzvanya midziyo yakarongerwa yenguva pfupi-yekupikisa kukosha ikozvino, kubva panzvimbo yekumisikidza yepamusoro-pfupi-yedunhu ikozvino, conductor kana zvimwe midziyo muhurongwa kubva pakushanda tembiricha kukwira kusvika kune tembiricha inogona kumira muganhu wenguva, izvi zviviri zvinhu. kufunga, pakusarudza iyo yakanyanya kupfupika-yedunhu ikozvino yekumisikidza saiti uye sisitimu inogona kutsungirira yakanyanya kupfupi-yedunhu ikozvino yenguva, Iyo inosarudzawo pfupi-nguva-yezvino-nguva kushivirira kweyakaderera-voltage midziyo panzvimbo yekuisa.

Nekuti chimiro uye mashandisirwo emidziyo yemagetsi akasiyana zvakasiyana, pane zvimwe zvakakosha zvinodiwa zvenguva pfupi-yenguva-yenguva kukosha pahwaro hwekugutsa kuchengetedzwa kwehurongwa:

• Zvemidziyo yemagetsi senge mabhawa, yakaderera-voltage magetsi ekugovera makabati, uye yekubvisa maswichi, iyo pfupi-yedunhu kukosha kwazvino haifanirwe kuve yakaderera pane inotarisirwa kupfupi-sekiti ikozvino kukosha panzvimbo yekumisikidza, uye nguva yenguva pfupi-yenguva inogumira inofanirwa. kwete kupfupika kupfuura nguva yekushanda yemidziyo yekudzivirira muhurongwa.

• Kune vanopwanya vedunhu vachishandisa kirasi B, iyo pfupi-yekushivirira ikozvino kukosha haizove yakaderera pane inotarisirwa pfupi-yedunhu kukosha ikozvino panzvimbo yekumisikidza, uye kupfupi-kushivirira ikozvino muganhu nguva haizove shoma pane iyo nguva yekushanda yehurongwa hwakaderera. -level inodzivirira midziyo, uye simbisa iyo yekusarudza ine yakaderera-level midziyo yekudzivirira.

Zvino, hurongwa simba rekupa mutoro uye inotarisirwa pfupi-redunhu ikozvino kuwedzera, kugovera bhazi hurongwa density kuwedzera, yakaderera-voltage magetsi midziyo miniaturization, kana chete kutsvaka kwenguva pfupi kushivirira ikozvino pasi penguva refu muganhu ukoshi mukuru, chaizvoizvo, hapana chikuru chinoshanda kukosha.

Saka zvinoenderana neinogoneka yakakwira mapfupi-yedunhu ikozvino kuisirwa mapoinzi uye zvimwe zvigadziriso zviri muhurongwa zvinogona kumirisana nepamusoro-pfupi-yedunhu ikozvino yenguva, zvine musoro kusarudzwa kwemidziyo yemagetsi munzvimbo yakachengeteka pasi penguva yenguva pfupi yekupikisa kukosha kwezvino, mu zvinoenderana ne0.5 s Icw kukosha kubvunzo inoita kunge yakakwanisa kuzadzisa zvinodiwa zvekuchengetedza system uye kugona kwakanyanya.