Pb 1 Si 2 Panu an 2.2010
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Transcript of Pb 1 Si 2 Panu an 2.2010
Pb
Pb. 1. Sa se determine parametrii de mers in gol a unui reansformator monofazat avand urmatoarele date: SN = 1867 kVA
U1N / U2N = 20/6,6 kV
I1N / I2N = 92,5/283 A
P1.0=6,17 kW-puterea de mers in gol
I1.0 = 4,5% din I1N F = 50 Hz
Schema electrice echivalente ale transformatorului electric monofazat la la mersul n gol.Rezolvare
WPb. 2 Pentru un transformator monofazat cu puterea nominala SN =330 kVA, tensiunea primara nominala U1N = 20 kV, raportul de transformare ku = 50.ku = U1N / U2N = W1 / W2 = I2N / I1NSe cunoaste:
- i1.0 = 2,5%
- P1.0=0,71 kW-puterea de mers in gol
- usc = 5,8%; usc = (u1sc / U1N) 100 [%]- PJN = 4,7 kW
Sa se calculeze parametrii schemei echivalente a transformatorului:
Schema echivalent la funcionarea n gol.
b) Diagrama fazorial.
Sa se calculeze:
Rezolvare:
I01
I01
U20
U1
Zm=Rm+jXm
Z1=R1+jX1
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R1
jX(1
I10
I2 = 0
Rm
jXm
U20
U1n
-Ue1
jX(1I10
R1I10
-Ue1=U20
U1
I1m
I10
I10a
I10
(
a)
b)