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English to Serbian: Izvod iz prevoda en-sr tehničkoc izveštaja CEI IEC TR 61818 General field: Tech/Engineering Detailed field: Electronics / Elect Eng
Source text - English d) The rated current In of the fuse-link is selected to be equal or greater than the operational current of the circuit and equal or smaller than the continuous current-carrying capacity of the conductor:
where
IB is the operational current of the circuit;
Iz is the continuous current-carrying capacity of the conductor (see IEC 60364-5-52);
In is the rated current of the fuse-link.
8.2 Types gN and gD
The requirements for the selection of fuses for the protection of conductors are found in the North American wiring regulations.
a) The voltage rating of the fuse is selected to be equal or greater than the maximum system voltage.
b) The load current is calculated and multiplied by 1,25 for continuous loads (continuous loads are those which are present for 3 h or more).
c) The conductor size is selected from an ampacity (current-carrying capacity) table found in the wiring regulations.
d) The general rule for selecting the fuse is to select a standard fuse current rating to coincide with the conductor ampacity. For conductor ampacity less than 800 A, if the conductor ampacity falls between two standard fuse-link current ratings, the larger fuse-link current rating is used. For conductor ampacities of 800 A and over, if the ampacity falls in between two standard fuse-link current ratings, then the smaller fuse-link current rating is used.
e) The fuse is selected to protect the conductor under short-circuit conditions. In practice, North American cable standards have been coordinated with fuse standards so that shortcircuit protection is achieved. For other types of conductors, short-circuit withstand ratings are compared with the fuse characteristics to make sure that conductor damage does not occur.
9 Coordination of protective devices
9.1 General
Discrimination of protective devices is a major point to be considered when designing lowvoltage installations. The aim of discrimination is to minimize the effects of a fault. Only the faulted circuit shall be disconnected while the others shall remain in service. Discrimination is achieved if a fault is cleared by the protective device situated immediately upstream of the fault without operation of other protective devices.
The following explanation applies to the most widespread application, the radial network.
Discrimination may be explained using the network diagram in Figure 4. Using this diagram, several cases of discrimination may be considered:
between F2 and F4 see 9.2
between F1 and F3 see 9.2
between C1 and F3 see 9.3
Translation - Serbian d) Naznačena struja In zamenljivog dela osigurača se izabira da bude jednaka ili veća od radne struje kola i jednaka ili manja od trajne prenosne moći provodnika:
gde je:
IB je radna struja kola;
Iz je trajna prenosna moć prvodnika (pogledati IEC 60364-5-52);
In je naznačena struja zamenljivog dela osigurača.
8.2 Tipovi gN i gD
Zahtevi za izbor osigurača za zaštitu provodnika se nalaze u severnoameričkim propisima za ožičavanje.
a) Naznačeni napon osigurača se izabira da bude jednak ili veči od največeg napona mreže.
b) Struja opterećenja se izračunava i množi sa 1,25 za trajna opterećenja (trajna opterećenja su ona koja su prisutna 3 sata ili duže).
c) Veličina provodnika se izabira iz tabele prenosne moći koja se nalazi u propisima za ožičavanje.
d) Opšte pravilo za izbor osigurača je da se izabere standardna naznačena struja osigurača koja se poklapa sa prenosnom moći. Za prenosnu moć provodnika manju od 800 A, ako prenosna moć provodnika pada između dve standardne vrednosti naznačene struje zamenljivog dela osigurača, uzima se veća vrednost naznačene struje zamenljivog dela osigurača. Za prenosnu moć od 800 A i više, ako prenosna moć pada između dve standardne vrednosti naznačene struje zamenljivog dela osigurača, tada se uzima manja vrednost naznačene struje.
e) Osigurač se izabira da zaštiti provodnik u uslovima kratkog spoja. U praksi su severnoamerički standardi za kablove koordinisani sa standardima za osigurače tako da se postiže zaštita od kratkog spoja. Za druge tipove provodnika, naznačene vrednosti podnošenja kratkog spoja se porede sa karakteristikama osigurača da bi se osiguralo da ne dodje do oštećenja provodnika.
9 Koordinacija zaštitnih aparata
9.1 Opšte
Selektivnost zaštitnih aparata je glavna tačka koju treba razmotriti kada se projektuju instalacije niskog napona. Cilj selektivnosti je da smanji uticaj kvara na najmanju moguću meru. Isključuje se samo kolo koje je u kvaru dok ostala kola ostaju u pogonu. Selektivnost se postiže ako kvar isključi zaštitni aparat koji se nalazi neposredno upstream iznad kvara bez delovanja drugih zaštitnih aparata.
Na najrasprostranjeniju primenu, radijalnu mrežu, se primenjuje sledeće objašnjenje.
Selektivnost može da se objasni korišćenjem šeme mreže sa slike 4. Korišćenjem ove šeme, može da se razmatra nekoliko slučajeva selektivnosti:
između F2 i F4 pogledati 9.2
između F1 i F3 pogledati 9.2
između C1 i F3 pogledati 9.3
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Experience
Years of experience: 25. Registered at ProZ.com: Jan 2017.
English to Serbian (QUT, Brisbane, QLD) Serbian to English (UB Faculty of El. Eng)
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Adobe Acrobat, Microsoft Excel, Microsoft Office Pro, Microsoft Word, Powerpoint
Bio
Graduated Power Engineering at the Faculty of Electrical Engineering University of Belgrade.
Master of Engineering, Queensland University of Technology, Brisbane, QLD, Australia. Worked at QUT as associate professor in setting and tutoring of laboratory sessions for the testing of electrical machines. Also worked at SIMTARS (Safety in Mines Testing and Research Station) Red Bank as research engineer and testing officer for the electrical equipment for use in underground mines. Full coordinating, leading and finalizing of research projects and testing of electrical equipment according to relevant Australian Standards. Currently working at DSO Serbia, Belgade.
Translation (en-sr and sr-en ) of a great number of International Technical Standards, Tender documentation for HV cable, Testing certificates for electrical equipment, Catalogs, operation and installation manuals for MV/LV electrical equipment of world leading companies, installation manuals for medical equipment, design documentation for electrical projects etc.
My fields of expertise are definitely electrical and IT engineering, civil engineering and engineering in general.
Expertise