E le ho thibela bothata ba ho lutla, ho phaella ho theolelo eaqoelisa, khetho ea mosireletsi oa ho lutla le eona ke ea bohlokoa haholo.Ho ea ka tekanyetso ea naha ea GB/T 187487.1, mosireletsi oa ho lutla oa qubu ea ho tjhaja o lokela ho sebelisa mofuta oa B kapa mofuta oa A, o sa sireletseng feela khahlanong le ho lutla ha AC, empa hape o sireletsa khahlanong le pulsating DC.Phapang e kholo pakeng tsa Mofuta oa B le Mofuta oa A ke hore Mofuta oa B o ekelitse tšireletso khahlanong le ho lutla ha DC.Leha ho le joalo, ka lebaka la bothata le litšenyehelo tsa litšenyehelo tsa ho lemoha mofuta oa B, bahlahisi ba bangata hona joale ba khetha mofuta oa A. Kotsi e kholo ka ho fetisisa ea ho tsoa ha DC hase kotsi ea botho, empa kotsi e patehileng e bakoang ke ho hlōleha ha sesebelisoa sa ts'ireletso sa pele sa ho lutla.Ho ka boleloa hore ts'ireletso ea hona joale ea leakage ea liqubu tsa ho tjhaja e na le likotsi tse patiloeng maemong a tloaelehileng.
Mofuta oa A leakage circuit breaker
Mofuta oa A-mofuta oa leakage circuit breaker le AC-type leakage circuit breaker ha e le hantle li tšoana ho latela molao-motheo oa ho sebetsa (boleng ba ho lutla bo lekanngoa ka transformer ea hona joale ea zero-sequence), empa litšobotsi tsa magnetic tsa transformer lia ntlafatsoa.E etsa bonnete ba ho khoptjoa tlas'a maemo a latelang:
(a) Ho tšoana le mofuta oa AC.
(b) Residual pulsating DC current.
(c) Motlakase o boreleli oa DC oa 0.006A o behiloe holim'a motlakase o setseng oa DC.
Mofuta oa B leakage circuit breaker —— (CHINAEVSE e ka etsa RCD Type B)
Li-circuits tsa mofuta oa B tse lutlang li ka sireletsa mats'oao a sinusoidal AC ka ts'epo, mats'oao a pulsating a DC le mats'oao a boreleli, 'me li na le litlhoko tse phahameng tsa moralo ho feta mofuta oa A leakage circuit breakers.E etsa bonnete ba ho khoptjoa tlas'a maemo a latelang:
a) Ho tšoana le Mofuta oa A.
b) Residual sinusoidal alternating current ho 1000 Hz.
c) Sebaka se setseng sa AC se phahame ka motlakase o boreleli oa DC oa makhetlo a 0.4 ho feta
d) The residual pulsating DC current e phahame ka makhetlo a 0.4 ho feta tekanyo e setseng ea hona joale kapa ea boreleli ea DC ea 10mA (ho sa tsotellehe hore na ke efe e kholoanyane).
e) Masala a maqhubu a DC a hlahisoang ke lipotoloho tse latelang tsa tokiso:
- likhokahano tse peli tsa borokho ba halofo ea maqhubu ho ea moleng oa 2-, 3- le 4-pole Earth leakage circuit breakers.
- Bakeng sa li-circuit tsa 3-pole le 4-poles leakage earth, likhokahanyo tse 3 tsa naleli ea halofo ea maqhubu kapa likhokahanyo tse 6 tsa borokho ba halofo ea maqhubu.
Nako ea poso: Jun-19-2023