Ro / ME + IEB / El.Bord / 9

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Ro / ME + IEB / El.Bord / 9
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“ANR — ME.IEB-EL — Ro / ME + IEB / El.Bord / 9” contains 43 questions across 1 collection.

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Din ce cauza un generator sincron care manifesta o instabilitate a functionarii in paralel, oscilatii ale puterii si intensitatii curentului, si un bazait specific, ce intra in rezonanta cu oscilatiile aparatelor?

One correct answer

generatorul a intrat in regim asincron de functionare;
avarii in retea, in special scurtcircuite;✓ Correct answer
generatorul de antrenare are o functionare instabila;

Din ce cauza un generator sincron manifesta o instabilitate a functionarii in paralel, oscilatii ale puterii si intensitatii curentului, si un bazait specific, ce intra in rezonanta cu oscilatiile aparatelor?

One correct answer

regulatorul motorului primar este defect;✓ Correct answer
generatorul a intrat in regim asincron de functionare;
turatie insuficienta la masina primara;

Care sunt principalele caracteristici tehnice ale generatoarelor sincrone fara inele si perii, in executie navala, de tip SEFIN?

One correct answer

izolatia rotorului generatorului se realizeaza in clasa de izolatie B;
autoexcitatia acestor generatoare este asigurata de magneti permanenti din ferite, prevazuti in circuitul magnetic al excitatoarei care asigura o tensiune remanenta de minim 50 V;✓ Correct answer
au putere nominala de 160, 350, 700 si 1200 Kw;

Care sunt conditiile obligatorii pentru cuplarea a doua generatoare electrice sincrone trifazate?

One correct answer

tensiunea generatorului nr. 1 U1 = U20;✓ Correct answer
frecventa generatorului nr. 2 sa fie diferita de frecventa generatorului nr. 1 : f1 ≠ f2;
daca la retea succesiunea fazelor este A, B, C iar la generator A', B', C' la cuplarea in paralel trebuie sa fie conectate fazele A cu C', B cu B' si C cu A';

Din ce cauza, la un generator sincron fara inele se observa ca, in sarcina, tensiunea generatorului scade cu mai mult de 3% Un, desi in gol, generatorul cu regulatorul de tensiune functioneaza normal?

One correct answer

tensiunea remanenta asigurata de magnetii permanenti este de sens contrar tensiunii dezvoltate de generator;
turatia generatorului scade cu mai mult de 5% din turatia nominala;✓ Correct answer
intrefierul transformatorului de compundaj este prea mic;

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