Ukuze kuvinjelwe inkinga yokuvuza, ngaphezu kokufakwa kwesisekelo se-inqwaba yokushaja, ukukhethwa kwesivikelo sokuvuza nakho kubaluleke kakhulu. Ngokwezinga likazwelonke le-GB/T 187487.1, isivikelo sokuvuza senqwaba yokushaja kufanele sisebenzise uhlobo B noma uhlobo A, olungavikeli nje kuphela ekuvuthweni kwe-AC, kodwa futhi luvikela ekushayweni kwe-DC. Umehluko omkhulu phakathi kohlobo B nohlobo A ukuthi uhlobo B lunezivikelo ezengeziwe ekuvuthweni kwe-DC. Kodwa-ke, ngenxa yobunzima kanye nemikhawulo yezindleko zokutholwa kohlobo B, abakhiqizi abaningi okwamanje bakhetha uhlobo A. Umonakalo omkhulu wokuvuza kwe-DC akuyona ukulimala komuntu siqu, kodwa ingozi efihliwe ebangelwa ukwehluleka kwedivayisi yokuvikela ukuvuza yokuqala. Kungashiwo ukuthi isivikelo samanje sokuvuza kwamanqwaba okushaja sinezingozi ezifihliwe ezingeni elijwayelekile.
I-Type A leaking circuit breaker
I-A-type leakage circuit breaker kanye ne-AC-type leakage circuit breaker ziyafana ngokuyisisekelo ngokwemigomo yokusebenza (inani lokuvuza lilinganiswa nge-zero-sequence current transformer), kodwa izici zikagesi ze-transformer ziyathuthukiswa. Iqinisekisa ukukhubeka ngaphansi kwezimo ezilandelayo:
(a) Kufana nohlobo lwe-AC.
(b) Umsinga we-DC oshayayo osele.
(c) Ugesi we-DC obushelelezi ongu-0.006A ubekwe phezu kogesi we-DC osele oshayayo.
I-Type B leaking circuit breaker —— (I-CHINAEVSE ingenza i-RCD Type B)
Ama-Type B leakage circuit breakers angavikela ngokuthembekile amasignali e-sinusoidal AC, amasignali e-DC ashayayo kanye namasignali abushelelezi, futhi anezidingo zokuklama eziphakeme kune-Type A leakage circuit breakers. Iqinisekisa ukukhubeka ngaphansi kwezimo ezilandelayo:
a) Kufana nohlobo A.
b) I-residual sinusoidal alternating current ibe yi-1000 Hz.
c) Ugesi we-AC osele ufakwe ugesi we-DC obushelelezi ophindwe izikhathi ezingu-0.4 kunogesi osele olinganiselwe
d) Ugesi we-DC oshayayo osele ubekwe ngaphezulu kogesi osele olinganiselwe ngokuphindwe ka-0.4 noma ugesi we-DC obushelelezi ongu-10mA (noma yikuphi okukhulu).
e) Ama-DC currents asele akhiqizwa yizifunda ezilandelayo zokulungisa:
- umugqa wokuxhumanisa ibhuloho elinomugqa wamagagasi amabili kuya komunye umugqa wama-circuit breaker okuvuza komhlaba anezinsika ezimbili, ezintathu kanye nezine.
- Kweziphuli zesekethe zokuvuza komhlaba ezinezinsika ezintathu nezinsika ezine, ukuxhumeka kwezinkanyezi ezintathu ezinezinsika ezingamagagasi noma ukuxhumeka kwebhuloho elinezinsika eziyisithupha ezinezinsika ezingamagagasi.
Isikhathi sokuthunyelwe: Juni-19-2023