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]-3e,-/0WCe,4DZ4flG,L4/6e,;4y4Ue,XDZ4fl
;(f7,,46Z,./9+
]&G,,0Z?5WC

g

}^

0[,/1,4p07D,;S4,~
,,0BO;|`0Z?

g

}^

B5Ke,4,./07SQ•€0ZS,07
,46ZW7B5
]%,,/0Z?/,G07DZ4flXM,./9+SQ•€
  F3]5$`&4V-\abcZd[
•i0BODZ4fl,0k9B9907Wp
]v,07Wa,,./,;4y4)
‚Q
N
n
π
Q

N

=


QT
vt
µ
λω


Q
UN^
U
IEUE
×
×
QU??
]/ƒ/Wpp{?sD;

R
X^9zDm/4WX0+5jgg
}^
F

]/Wpp{?sD;

R
X^9zDm/4WX0+5jtgtg
t}^tk,r4Bb,Y<
]`,,0Z?gg};|,,0BOnG,WC„',~,,0BO++WC„'
;|`,,0Z?tgtgt}B5<X,,/0Z?%,,/0Z?X6Y</
,G0BO,C<Wa,,./9+(,,`0BO,X60ƒ/
0BOpDZ4fl7+,0,./9+5WC,,G, α.

R
S
T
U
W
V
@
Q
E
R
S
T
U
W
VD
VV
V@
VQ
VE
VR
VS
VT
VU
V
VUD
VSD
VED
V@D
VDD
UD

/DZ4flXM,./9+
`,,0Z?

U

U

UU^

107',;/GS4,,0BO,~0BO
sS<,,fZ?UUUU^`,,0Z?X6/0V,,0<B5`07Wa,U
,,0Z?,./0z4,pY<,./,,0</,G0BODZ4flWQ•S


  F3]5$`-
( )
xfj =

ZWi0BODZ4fl/,,./9+/+ƒfe9B99Yk
]-3e,-/0WCe,sSYXe,XUe,4YXe,DZ4fl7/,
]-JY3S,)
UEFIIN
I
^U^I
?/S
?/S
===
bd
j
J

λω

†‡QNTˆ‚

QNEUIEU

Q@FNU^??>+


]`0Z?„B5WC0Z?,1Y:6Y19/1?0<
„Q
I
UEFIIN
^U^I
?/S
mm
j
j
==
µ
`0Z?'B5WC0Z?,fBCY:6S4
fBC?0<'Q
FU
UEFIIN
FU@^EI^
?
mm
j
j
==

D
F
E
4'
3'
2'
1'
C
A

‰+
S
F
1
F
2
"ME) 7/,
( )
xfJ =
  &4%
   '  ]5  $`  %      V-  _  e  #5  &4  3  f
( )
xfP
J
=−
.
ik9B99YkWCe,X0VuWC

P
K07,*Ue,4DZ4

YBb/46rL4Wr{?,9+;
k,*5,;3?)
?

QUIEAUNE?

o:6?

QUNQUN;
C?

QU@;YBbG?/46r
QR?tQU^]UNQU;
  
Z0(WXWi07/Y:6;YBb1?0W7f3
,,./?0J9+)
?Q
pt
F

Q

^NU
•U
π
QI;>?


9fe,*5,Yj,L4)9


>0.052= −44,5 ( ??
 9
‰?/S
Q9
‰?
>0.052 = 27,3( ??
†‡

Q†‡>0.052 = 25,9 ( ??
   R-5&F3
//Z07,*1-/09X9Q•€
ZDZ4fl9+4:;Z9
;
kG,L4/6,./e,;4y4€/XB+/4)
]i3e,-/09€e,X0V/WC0BODZ4fl

p
107,*
]-JY3S,)
=
α
µ
0>??

( )
mmmMN
p
>EU

=

7
( )
xfp
J
=−
DZ4fl07,*,G2Œ/;Z?/_,0,./0
,
/Z0BO
( )
xfp
J
=
X
( )
α
fp
J
=
,•*L4/07D,;0Z,46Z-/
03,;/Z07Bj;/Z=X=Q•€%BYB42K-/09€
9(0V087+fB,./9


c) Vẽ đồ thị
( )
α
fp =

.
k,*5,

1
=f(α).

  )E&F3]5$`%f\#f
( )
α
fT
=
.%\\#f
( )
α
fZ
=
và lực
ngang
( )
α
fN =
.
,07)Q•€UŽQ•€U%Q•€0Bb,Wi1,u?3<0
9fe,,,*5,)

( )
( )
β
βα
,+
+



0>??
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( )
mmmMN
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=
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UN  
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@@ UE


U^I
U N 
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=

( )
α
fZ
=
g
( )
α
fN =

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( )
α
fT
=
UYj,9946
( )
α
fZ
=
WXYj,/
( )
α
fN =

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U€Q





=
α

Me,;4y4,./S6Y/5/m?KW7


^=
α

e,;4y4,./S6Y/5D/m?KW7

N
E=
α

e,;4y4,./S6Y/5Bm?KW7


N@=
α

??k•)ΣQ

]

]
N

η
=
F

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FNU@U ÷=
m
η
g,-
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m
η
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P


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tb

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tb
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e,;4y4`07X6/,GZM?7+4DM,./9e(,feY1,;4y4,•B,GZfl
fXM?0Bb,Yj,YC:WXYj,DP:u079e(/,GZS,07;4Wj,,74Yj,:0ZS,
07W7;/Y‘fz4D*WX0ZS,079e(;+5,DrKe,

Yj,L4Y6{?
]oj,L4Y6{?)
P
Ro
F
Rm
P



ω
=

?

);YBb/46rL46f“Wr0z4)

@^UU@^U@^U

kgmm
tt
===
⇒
^NU
@^UE
EU@^U

@
@N



]VYj,
R
P
Wr9/fBC{?t/,G{?0{6YX{?,;4y4
`{?sWiWppBbB,;4y4
]v,077U9B,r4WX0Z?0VYj,
&7,./Yj,YX0fXWP,`,0W7D:;M?X/,z
r4,./Yj,BC`{?/X
Z?0V,./Yj,YX/,./9B;PfXWr9/,./WP,Yj,WX0BOpBbB,,
;4y4
αα
ααα
ŠŠ =+=++= ZTPQ
Ro

αα
ttRo
PPQ +=

α)YX0Z?D:;H107
‹
α
)YXb9Yj,,./,,Yj,,feY1,;4y4
2.2.7.Khai triển đồ thị phụ tải trong hệ toạ độ cực thành đồ thị Q -
α
:
/Z079e(K<00,,j,1X07‹
α
9e(4DM

tt
+=
WX7+,./
tt
P
0Bb,Y:6K07WP,9e(,feY1,;4y4%,,0z48
WP,Y</+i,G0BO,DZ4fZ07;/Z

α
fQ
=

 '('(S{6fj07‹α
X Y X Y X Y X Y
 @UII F FU@F N^ UIF EI IUN


 @UFF  ^UE NF @FU^ E^ UN
 EIU@F  ^U  NNUF@ EF U@N
N EUI  @U@  U @ NFUEI
 NUF N NUF@  U^ @ NUE
E NNUI@  UFE N U @ IUFI
@ EUEF E N@UFI  NU @N NUII
I U @ NUNF E NEUI @ U
^ UE I IU @ N^UN @E U@I
F EU ^ UI I UIE @@ IU
 FUEI F FU@ ^ ^UN @I NEUEN
 N@UNN N UF F FUE @^ EU^E
 U^ N NUN^ E EUNE @F EUN
N NUEI N NU E EU I @UFF


>IUEU@EUN@EUN

?
mMNQ
Q
===
µ

>IEEUEU
I
NEUI

I

mMN
Q
Q
Qtb
==

=
µ


I@UN
EU
IEEU
==
tb

r4,./Yj,,feY1,;4y4Bb,,r4WCYj,,feY10z4/46rB7+,./
,8Dm/4
if<0z4/46rY1?O:6DGU{?,./0z4/46rYXs
i?WppD:;HU{?s&/0Z?,./0BO{?9z{/46rWCWp{?sYX0Z?



`0Z?

U1Wpp,,0Z?UUNUUIk,r4L4/6e,;4y4WXB5WC,,G,
α


]β


Uα


]β


Uα
N

]β
N

UUα
I

E F  @
@ I  I
I NE E ^E
^ @ E FE
F E @
@

E


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