Kuti tidzivise dambudziko rekudonha kwemvura, pamusoro pekugadzika kwevhumurwi wekuchaja, kusarudzwa kwemudziviriri wekubuda kwemvura kwakakoshawo zvikuru. Zvichienderana ne standard yenyika GB/T 187487.1, dziviriri yekubuda kwemvura mudura rekuchaja rinofanira kushandisa mhando B kana mhando A, iyo isingangodziviriri kubva mukubuda kweAC chete, asiwo inodzivirira kubva kupurisa kweDC. Musiyano mukuru pakati peRudzi B neRudzi A ndewekuti Rudzi B rwakawedzera dziviriro kubva mukubuda kwemvura muDC. Zvisinei, nekuda kwekuoma uye zvipingamupinyi zvemutengo wekuona rudzi B, vagadziri vazhinji parizvino vanosarudza rudzi A. Kukuvadzwa kukuru kwekubuda kwemvura muDC hakusi kukuvara kwemunhu, asi njodzi yakavanzwa inokonzerwa nekukundikana kwemudziyo wekutanga wekudzivirira kubuda kwemvura. Zvinogona kutaurwa kuti dziviriro yekubuda kwemvura mudura rekuchaja ine njodzi dzakavanzika padanho re standard.
Chinopwanya dunhu remhando yeA
Chinopwanya dunhu reA-type leakage neAC-type leakage circuit breaker zvakafanana pakushanda (kubuda kwemvura kunoyerwa kuburikidza ne zero-sequence current transformer), asi hunhu hwemagineti hwechinopwanya dunhu hunovandudzwa. Izvi zvinoita kuti chigumbuke pasi pemamiriro anotevera:
(a) Zvakafanana nerudzi rweAC.
(b) Simba remagetsi reDC rinosara.
(c) DC current yakatsetseka ye0.006A inoiswa pamusoro peDC current yasara inopururudza.
Chinopwanya dunhu remhando B —— (CHINAEVSE inogona kuita RCD Type B)
Ma "leakage circuit breakers" erudzi rwe "Type B" anogona kuchengetedza zviratidzo zve "sinusoidal AC", zviratidzo zve "DC" zvinoputika uye zviratidzo zvakapfava, uye ane zvinodiwa zvekugadzira zvakanyanya kupfuura ma "leakage circuit breakers" erudzi rwe "Type A". Izvi zvinoita kuti pave nekugumburwa pasi pemamiriro anotevera:
a) Zvakafanana nerudzi rweA.
b) Simba remagetsi rinosara re sinusoidal rinochinja-chinja kusvika pa 1000 Hz.
c) Mvura yasara yeAC inoiswa pamusoro pemvura inotsvedzerera yeDC yakapetwa ka0.4 kupfuura mvura yasara yakayerwa.
d) Simba reDC rinosara rinoita pulsating rinowanikwa ne0.4 kakapetwa kupfuura simba reDC rinoonekwa kana kuti simba reDC rinotsvedzerera re10mA (chero riri guru).
e) Mapombi eDC akasara anogadzirwa nemasekete ekugadzirisa anotevera:
- mutsetse wekubatanidza bhiriji rine hafu yemafungu maviri kune rimwe mutsetse wezviputsi zvemadunhu zvinoputika zvepasi zvine 2-, 3- uye 4-pole earth leakage circuit.
- Kune ma "earth leakage circuit breakers" ane mativi matatu nemativi mana, kubatanidza nyeredzi nhatu dzine hafu yemafungu kana kubatanidza bhiriji rine hafu yemafungu matanhatu.
Nguva yekutumira: Chikumi-19-2023