. 3.12. TN-C
, , , L 2 (. 3.12), R, , (3.3) :
, YL1,UL2 UPEN U0, UL3 U0 U, .. .
,
; ; , ,
.
,
,
. (3.15)
. (3.16)
.
1. , R ,
. (3.17)
, .
2. R0,
,
.. , .
R R0 , , , , .. Uh , ,
. (3.18)
, R > R0, Uh , , IT.
. 3.13. TN-C
TN-C, , (. 3.13; L3) , , IT, R :
(3.20)
I - ; a1, a2 - .
a1= a2=1
TN-C R , R0 Rh. , R << Rh,
.
, ( ) TN-C , . , , , TN-C.
. . .
|
|
IT, 1 (. 3.7.)
. 3.7. IT
, , , , ( ) . , [3], (3.3, 3.4) , Y0 = 0; YPEN=0:
(3.5.)
YL1, YL2, YL3 - :
U - ;
a - , .
YL1 = YL2 = YL3 = Y (.. R L1 = R L2 = R L3 = R L1= L2 = L3 = ), :
(3.6)
(3.7)
Z -
(3.8)
R - ; - .
(3.9)
R L1 = R L2 = R L3 = R , .. L1= L2 = L3 = = 0, (3.9)
, . . Ih = f(R) = 0 ( ) Ih = f() R = const, . 3.8 [3].
. 3.8. , , IT ,