Page 175 - Electrician -1st Year - TT

BûLVôp ¡û[ ªuú]ôhPjûR ùYdPo ÑjRUô] CuPd¥qYôL CÚlTRôp
Øû\«p áh¥úVô ApXÕ L¯júRô L¦R ùNÛjRlTÓm ªu]ÝjRj§tÏ 90°
Øû\«p (AhªPuv Øû\) ApXÕ ¡Wô@l ©uRe¡Ùs[Õ (lags).
Øû\«p (ùYdPôo Øû\) ùT\ úYiÓm. ii ®§Lû[ ©uTt± ùYdPo YûWTPm
ERôWQm 1 (Example 1) YûWRp.

CûQ CûQl× ªuÑt±p ªuRûP vúLp 1 cm = 2 amps (Fig 5)
Utßm CuPd¥q ¬VôdPuv (Parallel
circuit with R and X in branches) : JÚ CûQ Fig 5
L
CûQl× ªuÑt±p JÚ ÑjRUô]
ªuRûPÙm Utù\ôÚ ¡û[«p ÑjRUô]
CuPdPuvÊm Es[RôL LY]j§p
ùLôsúYôm. Fig 4 -p Lôi©jÕs[
ªuÑtßdÏ ¸rLiPYtû\ LiÓ©¥dLÜm.

Fig 4

CûQLWjûR éoj§ ùNnÕ ùUôjR
ªuú]ôhPm I ûV LiÓ©¥dLÜm.
T
úLôQm θ ûVÙm Utßm ¿[m
OI ûV A[dLÜm.
T
'
iii A[dLlThP úLôQm 63 26 þdÏ §\u
LôW¦ (power factor) = Cos 63 26 1
i ¡û[ ªuú]ôhPeLs
= 0.447 (lagging)
ii ùYdPo TPjûR YûWL
iv OI «u ¿[m = 4.47 ùN. Á.
iii ùUôjR ªuú]ôhPm T
AR]ôp I = 4.47 x 2 = 8.94 Amps.
iv §\u LôW¦ Utßm §\u LôW¦ úLôQm T
ªuÑt±u JÚe¡ûQkR Cm©Puv = Z
v JÚe¡ûQkR Cm©Puv
v ªuÑtß GÓjÕdùLôiP ªuNd§
vi ªuÑt±u §\u.
P = VIcos ø = I R
2
¾oÜ (Solution) 1
= 240 x 8.94 x 0.447 = 4 x 60
2
V = 959 watts approx. 960 watts.
i ¡û[ ªuú]ôhPm I =
1 R
1 ERôWQm 2 (Example 2)
240 R XL Utßm XC Es[ CûQ CûQl×
1
= = 4 amps ªuÑtß (Parallel circuit with R XL and XC)
60 1
¸rLiPYtû\ LiÓ©¥dLÜm. (Fig 6)
ÑjRUô] ªuRûPVôL Es[Rôp
ªu]ÝjRj§tÏ CuúTv³p Es[Õ 1 JqùYôÚ ªuÑt±u LuPdPuv Utßm
NvùNlPuv (Conductance and Susceptance)
(In Phase) ¡û[ ªuú]ôhPm I ûY
2
LiÓ©¥dL ØRXõp CuPd¥q 2 ùUôjR G B Utßm Y
1
¬VôdPuv X ûV LQd¡P úYiÓm. 3 ¡û[ ÑtßL°u ªuú]ôhPm
L
22 4 PF Utßm PF úLôQm
X = 2 FL = 2 x x 50 x 0.0955
L
7 5 ªuÑtß GÓjÕdùLôsÞm ªuNd§
= 30 ohms. ¡û[ Ñt±u LuPdPuv (Conductance)
ARu ¡û[ ªuú]ôhPm
R 30 1
V 240 g = 1 = =
I = = = 8 amps. 1 2 30 2 30
L Z 1
X 30
L
= 0.0333 siemens
TYo : GXdh¬μVu (NSQF - Revised 2022) R.T. Ex.No. 1.5.49 155