Yuav kom tiv thaiv tau qhov teeb meem xau, ntxiv rau qhov av ntawm lubpawg them nqi, kev xaiv cov khoom tiv thaiv kev xau kuj tseem ceeb heev. Raws li tus qauv hauv tebchaws GB/T 187487.1, cov khoom tiv thaiv kev xau ntawm lub pawg them yuav tsum siv hom B lossis hom A, uas tsis yog tsuas yog tiv thaiv kev xau AC xwb, tab sis kuj tiv thaiv kev cuam tshuam DC. Qhov sib txawv loj tshaj plaws ntawm Hom B thiab Hom A yog tias Hom B tau ntxiv kev tiv thaiv kev xau DC. Txawm li cas los xij, vim muaj qhov nyuaj thiab kev txwv ntawm kev kuaj pom hom B, feem ntau cov chaw tsim khoom tam sim no xaiv hom A. Qhov teeb meem loj tshaj plaws ntawm kev xau DC tsis yog kev raug mob ntawm tus kheej, tab sis qhov txaus ntshai zais cia los ntawm kev ua tsis tiav ntawm lub cuab yeej tiv thaiv kev xau thawj. Nws tuaj yeem hais tias kev tiv thaiv kev xau tam sim no ntawm cov pawg them muaj kev phom sij zais cia ntawm qib tus qauv.
Hom A hluav taws xob tawg
Lub A-hom leakage circuit breaker thiab AC-hom leakage circuit breaker yeej zoo ib yam li cov hauv paus ntsiab lus ua haujlwm (tus nqi leakage ntsuas los ntawm lub transformer xoom-sequence), tab sis cov yam ntxwv sib nqus ntawm lub transformer tau txhim kho. Nws ua kom muaj kev tripping nyob rau hauv cov xwm txheej hauv qab no:
(a) Ib yam li AC hom.
(b) Cov DC tam sim no uas seem.
(c) Ib qho DC tam sim no du ntawm 0.006A raug muab tso rau ntawm qhov seem DC tam sim no pulsating.
Hom B hluav taws xob xau hluav taws xob —— (CHINAEVSE ua tau RCD Hom B)
Cov cuab yeej hluav taws xob xau hom B tuaj yeem tiv thaiv cov teeb liab sinusoidal AC, cov teeb liab DC pulsating thiab cov teeb liab du, thiab muaj cov qauv tsim siab dua li cov cuab yeej hluav taws xob xau hom A. Nws ua kom muaj kev cuam tshuam raws li cov xwm txheej hauv qab no:
a) Ib yam li Hom A.
b) Cov seem sinusoidal alternating current mus rau 1000 Hz.
c) Cov AC tam sim no seem yog superimposed nrog cov DC tam sim no du ntawm 0.4 npaug ntawm cov ntsuas seem tam sim no
d) Cov hluav taws xob DC uas seem pulsating raug muab tso rau saum 0.4 npaug ntawm cov hluav taws xob seem uas ntsuas lossis cov hluav taws xob DC du ntawm 10mA (qhov twg ntau dua).
e) Cov hluav taws xob DC seem uas tsim los ntawm cov voj voog kho hauv qab no:
- ob txoj kev sib txuas ntawm ib nrab nthwv dej rau 2-, 3- thiab 4-pole earth leakage circuit breakers.
- Rau 3-pole thiab 4-pole earth leakage circuit breakers, 3 ib nrab-wave star connections lossis 6 ib nrab-wave bridge connections.
Lub sijhawm tshaj tawm: Lub Rau Hli-19-2023