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Exi kalkulasjoner L/R verdi

Exi kalkulasjoner L/R verdi

MHA
MHA

Ved beregning av L/R verdi for en kabel i Exi kalkulasjoner.

Skal kabelens R verdi multiplieres med 2?

L/R = L/(R*2)

Jeg er ikke helt sikker på om begge kabelens ledere skal tas i betrakning?

Er det forskjell på om L/R verdien beregnes utifra om det er likestrøm kontra vekselstrøm som går i lederene?

Re: Exi kalkulasjoner L/R verdi

Re: Exi kalkulasjoner L/R verdi
Sverre Isaksen
Forumleder

Dette er formelen for å regne ut Lc/Rc forholdet til en kabel, Ref. IEC 60079-25:2020 Annex D:

Lc/Rc = 8eR+(64e²R²-72U²˳eL)½ H/Ω

                               4,5U²˳

Normalt så finner man kabelens L/R forhold oppgitt i datablad fra kabelleverandør. L/R forholdet kan kun brukes som alternativ dersom Li på alle tilkoblede instrumenter er under 1% av Lo, Co må fortsatt tas hensyn til. Det må også være oppgitt Lo/Ro verdi for barrieren.

Ex basic (E-learning)

Learn to work safely in hazardous areas. Course for electricians, automation technicians and others personnel.

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IECEx and ATEX marking of electrical equipment (E-learning)

Certified Ex equipment has a marking plate that includes details about the equipment's explosion protection and the area in which the equipment may be used. Can you interpret these codes?

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IECEx marking of electrical equipment (E-learning)

Ex equipment carries a marking plate that includes details about what surroundings and external influences the equipment has been certified for. Can you interpret the codes?

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Safe behavior in hazardous areas (E-learning)

Learn how to work safely in Ex areas. The authorities require documented training in explosion prevention for all who enter Ex areas.

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Ex basic refresher (Classroom)

When you are working with electrical installations in hazardous areas you must regulary refresh your knowledge. In this course you get the updates you need.

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Ex maintenance (Classroom)

Extension course for electricians and automators who will maintain Ex installations. The course requires basic Ex-knowledge.

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