Spring 2014
( )
3. (1)
(Electric Circuit) , (Magnetic Circuit) .
= = (magnetic flux) [Wb]F = (magneto motive force: mmf) [A] = (reluctance) [A/Wb]
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(: magnetic permeability):
(/m) (open circuit).
. .
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r0 = 0 : = 1.257 10/: ( ), .
r
HB = : (flux density): (flux intensity): (permeability)
: 1 . : 1 ( ) : 0 0
:
: , , : , ,
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()
(H ) (B)
(o) (a) . (a) H=0 (b) . .
(a)(b)(c)(d)(e)(f)(a) . ( )
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1885 William Stanley
.
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2
2 (magnetic core) .
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- 0 ( = 0)- (magnetic permeability ) . ,
(reluctance) 0- (leakage flux) . - .
(Amperes law)
(Magnetic field density) .
, Reluctance ,
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===
=-=
==
cc
cc
2211cc
enclosed
0BH
0ININlH
IdlHF
Q,
1
2
2
1
2211
NN
II
ININ
=\
=
(Faradays law)
() N ()
1 2
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( ) ( )dt
tdNtv f=
2
1
2
1
22
11
NN
VV
(t)dtdN(t)v
(t)dtdN(t)v
=
=
=
f
f
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2
1
1
2
2
1
NN
ii
vv ==
12 22
1 2 1 2 11
2 2 21 22
1
L
N VV N N V NZ Z
N N NI IIN
= = = =
** *1 2
1 1 1 2 2 2 2 22 1
N NS V I V I V I SN N
= = = =
:
:
1 2 .
3.1 2
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.
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(Exciting Current) = +
(): (hysteresis) + (eddy current) :
:
(laminated sheet) ():
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(Admittance)
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lHdlHINF
=== [ ]
AB =HB =
: (flux density): (flux intensity): (permeability)
[ ]
dtdN
dtdiLe f==
lINH =
NLI =
( ) ( ) 2Nl
AI
Al
NIN
IAHN
IABN
INL =
====
[ ]
1
2
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5% .
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, , ,
(Core)
0.3~0.6mm
:
, :
, , ,
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: 2 1 1 , 1 1 1 .
. ( ) .
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()
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22.9kV Smartgrid Lab at Kookmin University
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22.9kV/380V
3.2 , , ,
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Q: 200V ?
(Per-unit)( ) = ( )( )
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(Base value)
:
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. . ) 20kW , 100MW
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=newpuZ
. (, , , )
( ) 1 2
. , , 22.9kV
22.9kV ? , 0.0~1.0
. 3 Y, Delta , 3
.
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3.3 2 20kVA, 480/120V, 60Hz . 120V
= 0.052578.13. 2 1 .
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3.4 3 1 30kVA 240V
. (, )
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3.5 2.5 = 4800 Y =
3040 . = 185. = 10 = 480 , a .
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