protectii prin relee - erasmus pulseshiva.pub.ro/new/wp-content/uploads/2015/12/2015... ·...
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![Page 1: PROTECTII PRIN RELEE - ERASMUS Pulseshiva.pub.ro/new/wp-content/uploads/2015/12/2015... · -protectia maximala de curent impotriva scurtcircuitelor t. a = t. a max + Dt in care t](https://reader031.vdocuments.mx/reader031/viewer/2022012316/5e337301a1eb116dca02a415/html5/thumbnails/1.jpg)
PROTECTII PRIN RELEEPROTECTII PRIN RELEE
Principii si particularitati alePrincipii si particularitati aleprincipalelor protectiiprincipalelor protectii
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PROTECTII PRIN RELEEPROTECTII PRIN RELEEPrincipiiPrincipii sisi particularitatiparticularitati –– ProtectiaProtectia dede curentcurent
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PROTECTII PRIN RELEEPROTECTII PRIN RELEEPrincipiiPrincipii sisi particularitatiparticularitati –– ProtectiaProtectia maximalamaximala dede curentcurent
Fig. 1 – Schema de principiu a protectiei maximale de curenta)fara temporizare b) cu temporizare
1 - element de masura 1 - element de masura2 – element de comanda 2 – element de temporizare3 – element de semnalizare 3 – element de comanda
4 – element de semnalizare
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Fig. 1 – Schema de principiu a protectiei maximale de curentc) in doua trepte
1 - element de masura treapta 12 – element de masura treapta 23 – element de temporizare4 – element de comanda5 – element de semnalizare
PROTECTII PRIN RELEEPROTECTII PRIN RELEEPrincipiiPrincipii sisi particularitatiparticularitati –– ProtectiaProtectia maximalamaximala dede curentcurent
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Fig. 1 – Schema de principiu a protectiei maximale de curentd) cu blocaj la minima tensiune
1 - element de masura2 – element de tensiune minima3 – element de temporizare4 – element de comanda5 – element de semnalizare
PROTECTII PRIN RELEEPROTECTII PRIN RELEEPrincipii si particularitatiPrincipii si particularitati –– Protectia maximala de curentProtectia maximala de curent
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PROTECTII PRIN RELEEPROTECTII PRIN RELEEPrincipii si particularitatiPrincipii si particularitati –– Protectia maximala de curentProtectia maximala de curent
Fig. 2
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PROTECTII PRIN RELEEPROTECTII PRIN RELEE
Principii si particularitatiPrincipii si particularitati
Fig. 3 – Schema de principiu a protectiei maximale de curent numerice
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PROTECTII PRIN RELEEPROTECTII PRIN RELEE
Principii si particularitatiPrincipii si particularitati
Fig. 4 – Schema de principiu a protectiei maximale de curent numerice
current
voltage
measurementprocessingI measuredU measured3I0, I1, I23U0, U1, U2P, QP factorfdf/dt
Standard prot. logic(simplyfied)
pickup
TRIP
Fct. 1Fct. 2
Fct. 20
threshold delay
settingCurent
Tensiune
ReglajeMasurari:
I masurat
Umasurat
3I0, I1, I2
3U0, U1, U2
P, Q
Factor de putere
Frecventa
Alte marimi
Logica standard deprotectie (simplificata)
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Calculul reglajelorCalculul reglajelor
-valoare de actionare
-temporizare
-coeficienti de sensibilitate
PROTECTII PRIN RELEEPROTECTII PRIN RELEE
Principii si particularitatiPrincipii si particularitati
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PROTECTII PRIN RELEEPROTECTII PRIN RELEE
Principii si particularitatiPrincipii si particularitatiValoare de actionare-protectia maximala de curent impotriva scurtcircuitelor
Irev=KsigIn , Ksig = 1,1...1,2Krev = Irev / Ipp
Rezulta Ipp=Ksig x In / Krev = (1,1.....1,2) x In / 0,85 @ (1,3....1,4) x In
-protectia impotriva suprasarcinilorIrev=KsigIn , Ksig = 1,1...1,2Krev = Irev / Ipp
Rezulta Ipp=Ksig x In / Krev = 1,05 x In / 0,85 @ 1,2 x In
-blocajul la tensiune minimaKrev = Urev / Upp £ Umin expl / Ksig x UppKsig = 1,1..1,5 si Krev = 1,15
Rezulta Upp £ Umin expl / Ksig x Krev = 0,95Un / Ksig x KrevUpp @ (0,5.....0,6) x Un
-sectionarea de curentIpp=max {Ksig x Iscc’’max K si (3...5)Inom T }
Ksig = 1,2...1,6
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PROTECTII PRIN RELEEPROTECTII PRIN RELEE
Principii si particularitatiPrincipii si particularitati
Temporizarea
-protectia maximala de curent impotriva scurtcircuitelor
t a = ta max + Dtin careta max = cea mai mare dintre temporizarile protectiilor
maximale de curent ale elementelor racordate la bareledinspre consumatori
Dt = 0,5....0,6sec reprezinta treapta de timp pentru asigurareaselectivitatii
-protectia impotriva suprasarcinilor
t as = ta max scc + Dtin careta max scc= temporizarea protectiei impotriva scurtcircuitelor
exterioare
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Caracteristici de actionare
PROTECTII PRIN RELEEPROTECTII PRIN RELEE
Principii si particularitatiPrincipii si particularitati
Fig. 5 – Caracteristica de actionare independenta
Fig. 6 – Caracteristica de actionare dependenta
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