protectii prin relee - shiva.pub.roshiva.pub.ro/pdf/prot/2012_protectii_prin_relee_notiuni...
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PROTECTII PRIN RELEEPROTECTII PRIN RELEE
(1) _ NOTIUNI INTRODUCTIVE(1) _ NOTIUNI INTRODUCTIVE
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PROTECTII PRIN RELEEPROTECTII PRIN RELEE
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PROTECTII PRIN RELEEPROTECTII PRIN RELEE
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PROTECTII PRIN RELEE PROTECTII PRIN RELEE EvolutiaEvolutia protectiilorprotectiilor prinprin releerelee
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PROTECTII PRIN RELEE PROTECTII PRIN RELEE EvolutiaEvolutia protectiilorprotectiilor prinprin releerelee
Dulapuri clasice de protectie, cu relee analogice si elemente de comanda
traditionale
Dulapuri moderne de protectie, cu relee numerice multifunctionale
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PROTECTII PRIN RELEEPROTECTII PRIN RELEE
DefinitieDefinitie
Parametri principaliParametri principali
Cerinte impuseCerinte impuse
Clasificare Clasificare
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PROTECTII PRIN RELEEPROTECTII PRIN RELEE Schema bloc a unui sistem de protectiiSchema bloc a unui sistem de protectii
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PROTECTII PRIN RELEE PROTECTII PRIN RELEE Protectii numerice Protectii numerice -- schema bloc si principiul de functionareschema bloc si principiul de functionare
(1)(1)
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PROTECTII PRIN RELEE PROTECTII PRIN RELEE Protectii numerice Protectii numerice -- schema bloc si principiul de functionareschema bloc si principiul de functionare
(2)(2)
Fluxul de semnale in cazul releelor numerice
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PROTECTII PRIN RELEE PROTECTII PRIN RELEE PProtectiirotectii numericenumerice –– definitii si definitii si avantajeavantaje
•• Rapiditate in functionareRapiditate in functionare•• Consum propriu redusConsum propriu redus•• Gabarit redusGabarit redus•• Cheltuieli reduse in exploatareCheltuieli reduse in exploatare•• SensibilitateSensibilitate crescutacrescuta•• Durata mai mare de viataDurata mai mare de viata•• Siguranta in exploatare maritaSiguranta in exploatare marita•• Mentenanta redusaMentenanta redusa•• Existenta unei biblioteci de functiiExistenta unei biblioteci de functii•• Posibilitatea integrarii intrPosibilitatea integrarii intr--un sistem un sistem
ierarhizat de comandaierarhizat de comanda--controlcontrol•• Existenta mai multor seturi de parametriExistenta mai multor seturi de parametri•• Functia de autotestareFunctia de autotestare•• Memorie de evenimente si valori masurateMemorie de evenimente si valori masurate
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PROTECTII PRIN RELEE PROTECTII PRIN RELEE PProtectiirotectii numericenumerice --„„Intelligent Electronic DeviceIntelligent Electronic Device““ (IED)(IED)
etc.
etc.
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PROTECTII PRIN RELEE PROTECTII PRIN RELEE PProtectiirotectii numericenumerice -- Sistem integrat de comandaSistem integrat de comanda--controlcontrol
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PROTECTII PRIN RELEE PROTECTII PRIN RELEE PProtectiirotectii numericenumerice -- EExemplu de echipament de protectiexemplu de echipament de protectie
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PROTECTII PRIN RELEE PROTECTII PRIN RELEE PProtectiirotectii numericenumerice -- SSeturi de parametrieturi de parametri
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PROTECTII PRIN RELEE PROTECTII PRIN RELEE PProtectiirotectii numericenumerice -- Functia de autotestareFunctia de autotestare
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PROTECTII PRIN RELEEPROTECTII PRIN RELEE Parametrii principali ai protectiilor prin relee
•• ValoriValori nominalenominale
•• ValoareValoare de de actionareactionare
•• ValoareValoare de de revenirerevenire
•• TimpTimp propriupropriu de de actionareactionare
•• CoeficientCoeficient de de revenirerevenire
•• ConsumConsum propriupropriu
•• EroareEroare de de functionarefunctionare
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PROTECTII PRIN RELEEPROTECTII PRIN RELEE
ClasificareaClasificarea protectiilor prin releeprotectiilor prin relee
CriteriiCriterii de de clasificareclasificare
•• ParametruParametru monitorizatmonitorizat
•• TehnologieTehnologie de de realizarerealizare
•• FunctieFunctie
•• NumarNumar parametriparametri monitorizatimonitorizati
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PROTECTII PRIN RELEEPROTECTII PRIN RELEE
Principalele cerinte impuse protectiilor prin releePrincipalele cerinte impuse protectiilor prin relee
•• RapiditateaRapiditatea
•• SelectivitateaSelectivitatea
•• SensibilitateaSensibilitatea
•• FiabilitateaFiabilitatea
•• Independenta fata de conditiile de exploatareIndependenta fata de conditiile de exploatare
•• Eficienta economicaEficienta economica
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PROTECTII PRIN RELEEPROTECTII PRIN RELEE Functionarea selectiva a sistemelor de protectii prin releeFunctionarea selectiva a sistemelor de protectii prin relee
A B
C
I1
I2 I3
I4
L1
L2 L3
Consumatori
K
CEA CEB
Functionarea selectiva a sistemelor de protectii prin releeFunctionarea selectiva a sistemelor de protectii prin relee
a) retele buclate b)grup transformator-redresor
I2 I3
I1
I4La SI
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PROTECTII PRIN RELEEPROTECTII PRIN RELEE Zone de protectieZone de protectie
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PROTECTII PRIN RELEEPROTECTII PRIN RELEE Protectie de baza si de rezervaProtectie de baza si de rezerva
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PROTECTII PRIN RELEE PROTECTII PRIN RELEE Simboluri ANSI pentru functii de protectieSimboluri ANSI pentru functii de protectie (1)(1)
Nr. crt.
Cod ANSI Denumire functie de protectie Description
1 21/21N Protectie de distanta faza/homopolara Distance protection phase/ground
2 21FL Locator de defect Fault locator
3 25 Control sincronism Synchro-check
4 27 Protectia de tensiune minima Undervoltage protection
5 32 F/R Protectia directionala de putere (inainte/inapoi) Directional power (forward/reverse)
6 46 Protectie de secventa inversa (nesimetrie) Load unbalance protection
7 49 R/S Protectie la suprasarcina termica rotor/stator Thermal overload
8 50 Protectie maximala de curent netemporizata (instantanee)
Instantaneous overcurrent(Definite time)
9 50N Protectie maximala de curent homopolara netemporizata
Instantaneous ground fault overcurrent
10 51 Protectie maximala de curent temporizata Overcurrent with time delay (Inverse time)
11 51N Protectie maximala de curent homopolara temporizata
Ground fault overcurrent with time delay
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PROTECTII PRIN RELEE PROTECTII PRIN RELEE Simboluri ANSI pentru functii de protectieSimboluri ANSI pentru functii de protectie (2)(2)
Nr. crt.
Cod ANSI Denumire functie de protectie Description
12 51V Protectie maximala de curent cu controlul tensiunii (blocaj voltmetric)
Voltage dependant overcurrent-time protection
13 50BF DRRI (Declansare de rezerva la refuz de intreruptor)
Breaker failure
14 50EZ Protectie maximala de curent impotriva scurtcircuitelor in zona cuprinsa intre intreruptor si TC adiacente
End of zone
15 59 Protectie maximala de tensiune Overvoltage
16 67 Protectie maximala de curent directionala Directional overcurrent
17 67N Protectie maximala de curent directionala homopolara
Directional ground fault overcurrent
18 68 Blocaj la pendulatii de putere Oscillation (power swing) detection
19 81 Protectia de frecventa Frequency relay
20 87L/T/G/B/M Protectie diferentiala longitudinala – linie/transformator/generator/bare/motor
Differential protection
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PROTECTII PRIN RELEE PROTECTII PRIN RELEE ReprezentareReprezentare (1)(1)
ReprezentareReprezentare de de principiuprincipiu a a sistemuluisistemului de de protectiiprotectii pentrupentru un un transformatortransformator
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1/1/2525Schema Schema electricaelectrica monofilaramonofilara cu cu indicareaindicarea protectiilorprotectiilor
PROTECTII PRIN RELEE PROTECTII PRIN RELEE ReprezentareReprezentare (2)(2)
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PROTECTII PRIN RELEE PROTECTII PRIN RELEE RegimuriRegimuri de de functionarefunctionare ale ale sistemelorsistemelor electriceelectrice
In sistemele electrice, pot sa apara patru regimuri de functionare diferite, in care solicitarile si comportarea elementelor componente ale acestora prezinta valori si caracteristici deosebite:
-regimul permanent normal-regimul tranzitoriu din timpul functionarii normale-regimul tranzitoriu de avarie si de functionare perturbata-regimul permanent de dupa avarie.
i
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PROTECTII PRIN RELEE PROTECTII PRIN RELEE DefecteDefecte sisi regimuriregimuri anormaleanormale in in sistemelesistemele electriceelectrice
(din punctul de vedere al protectiilor prin relee)(din punctul de vedere al protectiilor prin relee)
DefecteDefecte•• ScurtcircuiteScurtcircuite polifazatepolifazate sausau monofazatemonofazate in in reteleretele cu cu neutrul neutrul
tratattratat•• Simpla/dublaSimpla/dubla punerepunere la la pamantpamant in in reteleretele cu cu neutrul izolatneutrul izolat•• IntrerupereaIntreruperea uneiunei fazefaze
RegimuriRegimuri anormaleanormale•• SupraintensitatiSupraintensitati determinate de determinate de suprasarcinisuprasarcini sausau scurtcircuitescurtcircuite
exterioareexterioare•• Scaderi de tensiuneScaderi de tensiune•• PendulariPendulari de de energieenergie
Regimuri tranzitoriiRegimuri tranzitorii•• Regim tranzitoriu de scurtcircuitRegim tranzitoriu de scurtcircuit•• RegimRegim de soc de de soc de magnetizaremagnetizare•• Fenomenul de saturare a transformatoarelor de curentFenomenul de saturare a transformatoarelor de curent
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PROTECTII PRIN RELEE PROTECTII PRIN RELEE DefecteDefecte sisi regimuriregimuri anormaleanormale in in sistemelesistemele electriceelectrice ––
RegimuRegimull tranzitoritranzitoriu de u de scurtcircuitscurtcircuit
CCurentulurentul de de scurtcircuitscurtcircuit are forma: are forma: ioio = = iopiop + + ioaioa
avândavând componentelecomponentele::iopiop -- curentulcurentul periodic de periodic de scurtcircuitscurtcircuitioaioa -- curentulcurentul aperiodicaperiodic ((tranzitoriutranzitoriu))
Curentul de scurtcircuit are expresia:
Tt
etIi coscos
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PROTECTII PRIN RELEE PROTECTII PRIN RELEE DefecteDefecte sisi regimuriregimuri anormaleanormale –– Regimul de soc de Regimul de soc de
magnetizaremagnetizare
CCurentulurentul de de magnetizaremagnetizare are forma: are forma: ii oo = = ii opop + + ii oaoa
avândavând componentelecomponentele::ii opop -- curentulcurentul periodic de periodic de magnetizaremagnetizareii oaoa -- curentulcurentul aperiodicaperiodic ((tranzitoriutranzitoriu))
Factorii care influenteaza durata si amplitudinea curentului de magnetizare sunt:
• -puterea transformatorului;• -rezistenta in sistemul electroenergetic de la sursa pina la transformatorul
respectiv;• -caracteristicile fizice ale transformatorului;• -fluxul rezidual si momentul punerii sub tensiune
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PROTECTII PRIN RELEE PROTECTII PRIN RELEE DefecteDefecte sisi regimuriregimuri anormaleanormale –– Fenomenul de saturare a Fenomenul de saturare a
transformatoarelor de curenttransformatoarelor de curent
Curent de scurtcircuit(primar)
Curent in secundarul TC fara saturatie Curent in secundarul TC cu saturatie
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PROTECTII PRIN RELEE PROTECTII PRIN RELEE Transformatoare de curentTransformatoare de curent
Caracteristica de magnetizare a unui TCCaracteristica de magnetizare a unui TC
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PROTECTII PRIN RELEE PROTECTII PRIN RELEE Transformatoare de curentTransformatoare de curent
ParametriParametri(a)(a) Raport de transformareRaport de transformare(b)(b) Puterea in secundarPuterea in secundar(c)(c) Clasa de precizieClasa de precizie(d(d--1)1) Factor limita de precizie (TC de protectie)Factor limita de precizie (TC de protectie)(d(d--2)2) Factor de siguranta (TC de masura)Factor de siguranta (TC de masura)
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PROTECTII PRIN RELEE PROTECTII PRIN RELEE Transformatoare de curentTransformatoare de curent