ELECTRICAL CIRCUITS
EEE
MALLA REDDY COLLEGE OF ENGINEERING AND TECHNOLOGY
If a coil of N turns carrying a current I is wound on the specimen 1 and if the magnetic flux is
assumed to be confined to iron core then the total reluctance
is given by the sum of the
individual reluctances S
1
and S
2
. This is equivalent to adding
the resistances of a series
circuit. Thus the total reluctance is given by
And the total flux is given by
ELECTRICAL CIRCUITS
EEE
MALLA REDDY COLLEGE OF ENGINEERING AND TECHNOLOGY
Problem :
Sketch the dotted equivalent circuit for the coupled coil shown in the fig.
and find
the equivalent inductive?
Solution:
The dotted equivalent circuit is
The equivalent inductive reactance is
j Xeq = j3 + j5 + j6 - 2 x j2 -2x j3+ 2x j4) = j14 - j2 = j12
Problem:
Sketch the dotted equivale1lt circuit for the coupled coils shown in figure and find
the
equivalent inductance at the terminals AB. All coupling coefficie1lt are 0.5.
Solution:
The dotted equivalent circuit is