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Kutheni kufuneka ukhuseleko motor breakers circuit MPCB

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Yintoni: olamlo circuit motor Magnetic

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Le miyalezo beesekethe ukukhusela izityalo evela kwiziphaluka ezimfutshane ngaphakathi kwimida umthamo wabo ngokuqhekezwa kwaye esebenzisa ezingasenza zemagneti (esinye isigaba ngasinye). breaking yesekethe Magnetic zonke-kwipali ukusuka ekuqaleni: omnye imbangela magnetic uya ngaxeshanye ukuvula yonke imiqobo.

Kuba imisinga short-wesekethe ophantsi, amaza beesekethe ukusebenza ngokukhawuleza iifyuzi. Lo khuselo anelisa standard IEC 60947-2. Ukuba baphule ngoku elifutshane kwisekethe kakuhle, kukho iziyaleli ezintathu:

·  Ukuba isigulo kwangethuba of the current olungachanekanga,

·  Ukwahlukana Rapid abafowunelwa,

·  Breakage ye yangoku mfutshane-wesekethe.

AC Motors - Ukhuseleko ngokuchasene iziphaluka ezimfutshane

Wonke  injini yombane  ilinganiselwe yokusebenza. Overshooting le mida ekugqibeleni kutshabalalisa yona kunye neenkqubo nto iqhuba, umphumo ube cima ikhompyutha kunye nelahleko ukusebenza. A circuit elifutshane abafowunelwa ngqo phakathi ngamanqaku amabini amathuba ezahlukeneyo zombane:

- Kuza ngoku : Isigaba-to-phase umfowunelwa, phase-to-cala umfowunelwa, phase-to-phantsi umfownelwa okanye uqhagamshelwano phakathi engathi kwisigaba,
- Direct current: contact between two poles or between the ground and the pole insulated from it.

Oku kunokuba inani kwiimbangi: umonakalo ivanishi zokwambathisa izinikezeli, evakalala, kwaphulwa okanye Ububahluba iingcingo okanye iintambo, imizimba zesinyithi amazwe, eqhuba iidipozithi (uthuli, ukufuma, njalo-njalo), ezizeni amanzi okanye ezinye ulwelo ukuqhuba, kweentambo engalunganga ngayo kwindibano okanye ukulungiswa.

A iziphumo ezimfutshane wesiphaluka Usenokuzingomb ngesiquphe yangoku leyo ukufikelela ezininzi izihlandlo ezilikhulu nomsinga ukusebenza ngaphakathi kwimizuzwana emininzi. A circuit short unokuba kunemiphumela emibi kwaye kakubi izixhobo umonakalo. Oku yayifuzisela yi iziganeko ezimbini.

 

phenomenon thermal

A simanga thermal esilingana amandla akhululwe kulo yombane kunqunyulwa kuyo wesekethe mfutshane yangoku  ngokuba ngexesha t esekelwe ifomula I 2 t waza wavakalisa njengoko A 2 s. Le isiphumo thermal kungabangela:

·  Ukunyibilika abafowunelwa Umqhubi,

·  Ukutshatyalaliswa izinto thermal kwi gqatso bimetal ukuba uququzelelo na uhlobo 1,

·  IsiZukulwana esiZuziweyo ajike zombane,

·  Calcination of izinto zokwambathisa ezikhoyo,

·  Umlilo izixhobo.

·  Iifyuzi , atsho umphathi wesekethe ungadlulanga ukunyibilika kwaye kufuneka kufakwe kamva,

·  Miyalezo beesekethe Magnetic  atsho ngokuzenzekelayo wesiphaluka kuphela ifuna ukuba reset.

ukhuseleko elifutshane-yesekethe kwakhona yakhiwe ibe izixhobo mininzi ezifana nokhuseleko motor starter kunye breakers lwekontraka.

Iingcaciso kunye neempawu

Ezona mpawu ziphambili izixhobo zokhuselo elifutshane-zeesekethe:

·  Breaking umthamo : ixabiso liphezulu ngoku elifutshane wesekethe kuqikelelwa ukuba isixhobo ukhuseleko usekhefini ombane elinikiweyo,

·  Umthamo yokuvala : ixabiso eliphezulu isixhobo ukhuseleko ukufikelela kwi ombane yayo elinganiselwe kwiimeko ezithile. Ixabiso lokuvala amaxesha k umthamo ikhefu njengoko kubonisiwe kule theyibhile ingezantsi.

umthamo Break (BC)

φ eKos

Wokuvala umthamo (CC)

4.5kA <BC <6kA

0.7

1.5 BC

6kA <BC <10kA

0.5

1.7 BC

10kA <BC <20kA

0.3

2 BC

20kA <BC <50kA

0.25

2.1 BC

50kA <BC

0.2

2.2 BC

Ikhefu kunye lokuvala amandla amaza beesekethe yi-  standard IEC 60947-2

Iifyuzi

Iifyuzi enze phase-by-isigaba (kwipali enye) ukukhuselwa kunye umthamo lekhefu aphakamileyo umthamo eliphantsi. Ibeka I2t kunye ntshikilelo electrodynamic (Icrête).

ngaba abayibeka:

·  On isekela ezikhethekileyo ebizwa fuseholders,

·  Okanye kwi isolators endaweni iziseko kunye links.

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Qaphela ukuba Isalathisi uhambo neekhatriji fuse into iingcingo kwi sixhobo ziguquka-ipali onke (idla ngokuba motor ulawulo lwekontraka) ukuthintela ukusebenza singlephase xa bangcungcutheke.

Le iifyuzi asetyenziselwa ukhuseleko motor zigxininise ukuba makhe ngokusebenzisa  overcurrents  ngenxa magnetising wangoku xa Motors zibuye zicinywe. Ukuba ayifanelekanga ukuba isetyenziselwe ukhuseleko ngokuchasene ukucima kombane (ngokungafaniyo GG iifyuzi) ngoko i relay sindisa kufuneka zongezwe wesekethe motor umbane. Ngokubanzi, isayizi yazo kufuneka ibe ngaphezulu nje umthwalo yangoku ngokupheleleyo enjinini.


Post time: Aug-13-2018

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