PRENAPONSKA_ZASTITA
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Transcript of PRENAPONSKA_ZASTITA
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PRENAPONSKA ZAŠTITA
izradio :BEZMALINOVIĆ VEDRAN
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VRSTE NAPONSKIH NAPREZANJAU ELEKTRIČNIM MREŽAMA
- Pogonski napon (stacionarni pogon)- Privremeni prenaponi (privremeno povišenjenapona)- Unutarnji prenaponinastaju pri: a) sklopnim operacijama
b) nastupu ferorezonancije- Vanjski prenaponinastaju pri: a) djelovanju druge mreže
b) atmosferskim izbijanjima
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Prenaponska
Atmosferska izbijanja
1. Direktni udar groma
2. Udar groma u fazni ili dozemni vodič dalekovoda
3. Atm. Izbijanje oblak-oblak
4. Inducirani prenapon u sekciji niskog napona
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Atmosfersko izbijanje
Udar groma u dalekovod
Direktni udar groma u:- stup dalekovoda- zaštitno (dozemno)uže
- fazni vodič
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Udar groma u vodič dalekovoda
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Gromobranska instalacija
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Razine zaštite od prenapona
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Udarna struja - ispitni impuls
Površina ispodkrivulje predstavljaenergiju odvodnjeodvodnika
krivulja 1: kl. Ckrivulja 2: kl.B
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Klase odvodnika prema normama IEC, VDE
Kl. I IEC 61643-1
Kl. B VDE 0675
Kl. II IEC 61643-1 Kl. C VDE 0675
Kl. III +IV IEC 61643-1
Kl. D VDE 0675
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POWERTEC kl. B
Iimp = 25 kA, 60kA (10/350µs)
Klasa B
Zaštitni nivo Up<2,5kV
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Shema polaganja POWERTEC kl. B
Odvodnici klase B
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PROTEC Kl. B+C
Kombinrani odvodnici
Klasa B+C
Iimp = 25 kA (10/350µs)
In = 40 kA (8/20µs)
Zaštitni napon Up<1,25kV
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COMBTEC kl.B+C
Klasa B+C Iimp = 12.5 kA (10/350µs)In = 40 kA (8/20µs)Zaštitni napon Up<1,25kV
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Odvodnici prenapona klase B/Cserija Combtec
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Odvodnici prenapona klase B/Cserija Combtec
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Odvodnici prenapona klase B/Cserija Combtec
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Odvodnici klase C
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Odvodnici klase C
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Odvodnici klase C
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Odvodnici klase C
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ODVODNICI klase D
Nazivni podaciMaksimalni dopušteni udarni naponUOC L-N 5 kV, L-PE 10 kV
Naz. struja odvodnje In (8/20 µs):L-N 2,5kA, L-PE 2,5kA, N-PE 5 kA
Zaštitni nivo Up pri In:L-N<900 V, L-PE<1900 V, N-PE< 1000 V
Nazivna udarna struja Imax(8/20) msL-N 5 kA, L-PE 5 kA
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ODVODNICI klase D
Shematski prikazi princip polaganja