Pofuna kupewa kutayikira vuto, kuwonjezera pa maziko akulipira mulu, kusankha kwa chitetezo chotayirira n'kofunika kwambiri.Malinga ndi muyezo wadziko lonse wa GB/T 187487.1, woteteza kutayikira kwa mulu wothamangitsa ayenera kugwiritsa ntchito mtundu wa B kapena mtundu A, womwe umangoteteza ku kutayikira kwa AC, komanso kumateteza ku pulsating DC.Kusiyana kwakukulu pakati pa Type B ndi Type A ndikuti Mtundu B wawonjezera chitetezo ku DC kutayikira.Komabe, chifukwa cha zovuta ndi zolepheretsa mtengo wa kuzindikira kwa mtundu wa B, ambiri opanga panopa amasankha mtundu A. Kuopsa kwakukulu kwa kutayikira kwa DC sikuvulaza munthu, koma ngozi yobisika chifukwa cha kulephera kwa chipangizo choyambirira chotetezera kutayikira.Tinganene kuti panopa kutayikira chitetezo cha nawuza milu ali ndi zoopsa zobisika pa mlingo muyezo.
Type A leakage circuit breaker
Mtundu wa A-Leakage circuit breaker ndi AC-type leakage circuit breaker ndizofanana potengera mfundo yogwirira ntchito (mtengo wotayikira umayesedwa kudzera pa thiransifoma ya zero-sequence current), koma mawonekedwe a maginito a transformer amawongolera.Imawonetsetsa kuyenda pansi pamikhalidwe iyi:
(a) Zofanana ndi mtundu wa AC.
(b) Zotsalira pulsating DC panopa.
(c) Mphamvu yosalala ya DC ya 0.006A imayikidwa pamwamba pamagetsi otsalira a DC.
Type B leakage circuit breaker —— (CHINAEVSE atha kuchita RCD Type B)
Zowonongeka zamtundu wa B zimatha kuteteza ma sinusoidal AC ma sinusoidal, ma sinusoidal AC ndi ma sign osalala, komanso kukhala ndi zofunikira pamapangidwe apamwamba kuposa mtundu wa A leakage breakers.Imawonetsetsa kuyenda pansi pamikhalidwe iyi:
a) Zofanana ndi mtundu A.
b) Zotsalira za sinusoidal alternating panopa mpaka 1000 Hz.
c) Mphamvu yotsalira ya AC imakhala pamwamba ndi yosalala ya DC yapano ya 0.4 nthawi yotsalira yotsalira
d) Mphamvu yotsalira ya DC yotsalira imayikidwa pamwamba ndi 0.4 nthawi zotsalira zotsalira kapena zosalala za DC za 10mA (zilizonse zazikulu).
e) Mafunde otsalira a DC opangidwa ndi mabwalo otsatirawa:
- mizere iwiri yolumikizira mlatho wa theka-wave ku mzere wa 2-, 3- ndi 4-pole earth leakage circuit breakers.
- Kwa ma 3-pole and 4-pole earth leakage circuit breakers, 3 half-wave star kulumikizana kapena 6 half-wave mlatho.
Nthawi yotumiza: Jun-19-2023