ELEKTRIVARUSTUS - Energia- ja geotehnika doktorikool II

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TTÜ elektriajamite ja jõuelektroonika instituut Elektrivarustus Raivo Teemets 8. Elektritarvitite sümmeetria tase – koormuste ja faasipingete sümmeetria. • Enamik tööstustarviteid on kolmefaasilised ja seetõttu sümmeetrilised. L1 L2 L3 N Tarviti 1 Tarviti 2 Tarviti 3 Tarviti 4 Tarviti 5 Tarbija Tarbija ja tarvitite sümmeetria selgitamiseks 15(101) ElVar 5. El. koormused.DK.doced DK TTÜ elektriajamite ja jõuelektroonika instituut Elektrivarustus Raivo Teemets • Asümmeetriat põhjustavad ühefaasilised tarvitid (nt. valgustid, ühefaasilised keevitusseadmed ja elektriahjud jms). 9. Lineaarsus • Tarviti ebalineaarsust iseloomustatakse enamasti voltamper tunnusjoonega. u a) u b) i Elektritarvitite volt-amper tunnusjooned a – lineaarne, b – ebalineaarne i 16(101) ElVar 5. El. koormused.DK.doced DK
TTÜ elektriajamite ja jõuelektroonika instituut Elektrivarustus Raivo Teemets • Ebalineaarsus rikub voolu ja pinge siinuselisust, kutsudes esile kõrgemaid harmoonilisi, mis omakorda risustab võrku. Sellisteks tarvititeks on nt pooljuhtmuundurid, lahenduslambid, elektrikaarahjud ja -keevitusseadmed. 10. Talitlusviisid: • püsitalitlus, • lühiajaline talitlus, • vaheajaline, • muud talitlused. 17(101) ElVar 5. El. koormused.DK.doced DK TTÜ elektriajamite ja jõuelektroonika instituut Elektrivarustus Raivo Teemets c) Tarvitite talitlusviisid a - püsitalitlus, b - lühiajaline talitus, c - vaheajaline talitlus t l – lülituskestus, t – perioodi (tsükli) kestus 18(101) ElVar 5. El. koormused.DK.doced DK
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ELEKTRIAJAMITE JA JÕUELEKTROONIKA
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TTÜ elektriajamite ja jõuelektroo
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ELEKTRIVARUSTUS - Energia- ja geotehnika doktorikool II

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