Kuti udzivise dambudziko rekudonha, kuwedzera kune iyo grounding yekuchaja murwi, kusarudzwa kwekudzivirira kwekudzivirira kunokosha zvakare.Zvinoenderana neyakajairwa chiyero chenyika GB/T 187487.1, iyo inodzivirira yekuvuza yemurwi wekuchaja inofanirwa kushandisa mhando B kana mhando A, iyo isingango dzivirira kubva ku AC kuvuza, asi zvakare inodzivirira kubva kupuruzira DC.Musiyano mukuru pakati peRudzi B neRudzi A ndewekuti Type B yakawedzera dziviriro kubva kuDC kuvuza.Zvisinei, nekuda kwekuoma uye kudhura kwezvipingamupinyi zvekutsvaga kwemhando yeB, vazhinji vanogadzira ikozvino vanosarudza rudzi rweA. Kukuvadza kukuru kweDC kuputika hakusi kukuvadzwa kwemunhu, asi njodzi yakavanzwa inokonzerwa nekukundikana kwechigadzirwa chekudzivirira chekare.Zvinogona kutaurwa kuti ikozvino leakage dziviriro yekuchaja mirwi ine njodzi dzakavanzika pachiyero chakajairwa.
Type A leakage circuit breaker
Iyo A-mhando yekuvuza yedunhu breaker uye iyo AC-mhando yekuvuza yedunhu breaker yakangofanana maererano nemusimboti wekushanda (ukoshi hwekuvuza hunoyerwa kuburikidza ne zero-sequence ikozvino transformer), asi magineti maitiro eshanduko anovandudzwa.Inovimbisa kufamba pasi pemamiriro anotevera:
(a) Zvakafanana ne AC mhando.
(b) Residual pulsating DC ikozvino.
(c) Iyo yakatsetseka yeDC ikozvino ye0.006A inokwidziridzwa pane yasara pulsating DC ikozvino.
Type B leakage circuit breaker —— (CHINAEVSE anogona kuita RCD Type B)
Type B leakage circuit breakers inogona kuchengetedza nekuvimbika sinusoidal AC masiginecha, inopuruzira masaini eDC uye yakatsetseka masaini, uye ine yakakwirira dhizaini zvinodiwa pane yemhando A leakage circuit breakers.Inovimbisa kufamba pasi pemamiriro anotevera:
a) Zvakafanana neRudzi A.
b) Residual sinusoidal alternating ikozvino kusvika 1000 Hz.
c) Iyo yakasara AC ikozvino inokwidziridzwa neyakatsetseka DC ikozvino ye0.4 nguva yakayerwa yasara ikozvino.
d) Iyo yakasara pulsating DC ikozvino inokwidziridzwa ne 0.4 nguva yakatarwa yasara ikozvino kana yakatsetseka DC ikozvino ye10mA (chero ipi yakakura).
e) Yakasara DC mafungu anogadzirwa neanotevera ekugadzirisa maseketi:
- maviri hafu-wave bhiriji yekubatanidza mutsara kune mutsara we2-, 3- uye 4-pole pasi pevhu kuvuza seketi mabreaker.
-Kune 3-pole uye 4-pole earth leakage circuit breakers, 3 half-wave star connections kana 6 half-wave bridge connections.
Nguva yekutumira: Jun-19-2023