56
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. . 10-1
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2012
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4. t=(0+)
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7.
(A)
i1(t), i2(t), i3(t).
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7) (i1):
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i1:
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8) (
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10) 
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i1(t):
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1) 
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| 1t | 2t | 3t | 4t | 5t | |
| 0,749 | 0,126 | -0,1132 | -0,0065 | 0,0159 | -0,00059 |
4
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: U=600 (B); ψ=-90; R1=80 (); R2=80 (); L= 0.25 ().
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1) :
(B).
2) . :
().
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(B).
t(0-):
i1(t)= i2(t)= 8.327sin(ωt-134.4) → i1(0-)= i2(0-) =8.327sin(-134.4)=-5.94 (A);
i3(t)= i3(0-) =0 (A);
UL(t) =648.39sin(ωt+44.4) → U(0-)= 648.39sin(44.4)=462.75(B).
3) . :
();
:
U23=Im1∙Z23=7.46ej71∙56.0314ej46.6= 420.1ej117.6 (B);
UmL= U23=420.1ej117.6 (B);
t(0+):
i1 =7.46sin(ωt+71) → i 1(0+)=7,46sin(71)=7,05 (A);
i2 =5,35sin(ωt+27,6) → i2 (0+)=5,35sin(27,6)=2,48 (A);
i3 =5.251sin(ωt+117,6) → i3 (0+)=5,251sin(117,6)=4,653 (A);
UL=420,1sin(ωt+117.6) →UL(0+)=420,1sin(117,6)=372.18(B).
4) t(0+) . UL(0+)= UL(0-)=462.75 (B).
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5) :
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6) t(0+):
i1 (0+) = i 1(0+)- i 1=5,882-7,05=-1,168();
i2 (0+) = i 2(0+)- i 2=0,098-2,48=-2,382();
i3 (0+) = i3 (0+)- i 3=5,784-4,653=1,131();
UL (0+) = UL (0+)- UL =420,75-372,18=98,44(B);
7) :
i1(t) =1ept → i1(0+)=- 1.168→ i1(t)= -1.168e-160t (A);
i2c(t) =2ept → i2c(0+)=-2. 382→ i2(t)= -2.382e-160t (A);
i3(t) =3ept → i3(0+)= 1.131→ i3c(t)= 1.131e-160t (A);
ULc(t) =Lept → UL(0+)= 98.44→ ULc(t)= 98.44e-160t ();
8) :
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i1 =7.46sin(ωt+71) -1.168e-160t (A);
i2 =5,35sin(ωt+27,6)-2.382e-160t (A);
i3 =5.251sin(ωt+117,6) +1.131e-160t (A);
UL=420,1sin(ωt+117.6)+ 98.44e-160t ();
i1(t):
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t=5∙τ=5∙0,00625=0,0313 ();
i1(t)
