Page 157 - Electrician -1st Year - TT

G]úY ( = Z R 2 X + 2 ) Km
L

G]úY (Z) B]Õ Kªp A[dLlTÓ¡\Õ.

ªuRûP (R) Kªp A[dLlTÓ¡\Õ.
CuPd¥q ¬VôdPuv X þ«Ûm Kªp
L
A[®PlTÓ¡\Õ.

JÚ ùRôPo RL ªuÑt±p ùUôjR ªuRûP V
Utßm I = Bm©V¬p (A)
(Impedance of a series RL circuit): RL ùRôPo Z
ªuÑt±Ûs[ ªuú]ôhPj§u ùUôjR
§\u LôW¦ (Power factor): EiûUVô]
G§olûTúV ùUôjR ªuRûP GuTo. CRû]
§\àdÏm úRôt\j§\àdÏm CûPlThP
Be¡Xj§p Cm©Puv GuTo. Z GuTÕ
®¡Rm §\u LôW¦ G]lTÓm.
CRu ϱÂPôÏm. CÕ ùUôjRUôL Aàl×m
ªu]ÝjRm V Utßm ªuú]ôhPm I W
Power factor = = Cos
B¡VYt±tÏ CûPúV Es[ ®¡RUôÏm. VA
Cm©Puvû^ Km Gu\ AXLôp
CRû] Lôv ¾hPô GuTo.
A[dLlTÓ¡\Õ. B]ôp ©uYÚY]Ytû\
TôodÏm ùTôÝÕ Cm©Puv B]Õ W V R
§\u LôW¦ (PF) = = R =
ªuRûP Utßm ¬VôdPuv B¡VYt±u VA V Z
ùYdPôo áhPXôÏm. RL ªuÑt±u
ªu]ÝjR ØdúLôQjûR LÚj§p GlùTôÝÕm ªuÑt±p çnûUVô] ªu
ùLôiPôp ùYdPôo LQd¡p ªuRûP RûPVôL UhÓm CÚkRôp §\u LôW¦ = 1.
Utßm G§o ¨LrÜ RûPûV LôWQm,ªuú]ôhPm Utßm
A[®PlTÓ¡\Õ. (Fig 4) ªu]ÝjRj§tÏ CûPúV Es[ úLôQm =

ùLôÓdLlThPÕ V = V + V Utßm V = IR 0 BÏm.
2
2
2
R L R
Utßm V = IX AR]ôp Lôv ¾hPô = 1 Utßm PF = 1
L L
AúR úTôp ªuÑt±u çnûUVô]
çi¥ûL ApXÕ çnûUVô]
ùLlTô£hPo UhÓm CÚkRôp §\u LôW¦
ûNTWôL CÚdÏm.
AlùTôÝÕ Lôv = Lôv 90°

AÓjRRôL ARu U§l× = 0
ERôWQm (Example): Lm©f ÑÚ°u ªuÑt±p
V = (IR) 2 + (IX L ) 2 ªuRûP 2 Km Es[Õ. ARtÏ ùRôPo

CûQl©p 0.015 ùau± ùLôiP
2 2 2 2 CuPdPuv Es[Õ. CkR Ñt±u
= I R (I + X L )
1 ªuú]ôhPm Utßm

= I 2 (R 2 X + L 2 ) 2 TYo úTdPûW LiÓ©¥dLÜm.
CkR CûQl×dÏ 200 úYôph, 50 ûNd¡s/
2 2 V 2 ®Sô¥ Uôß §ûN ªuNd§ ùLôÓdLl
I = R + X and = R 2 X +
L I L TÓ¡\Õ.

V
B]ôp B]Õ Cm©Puv (Z) BÏm.
I

TYo : GXdh¬μVu (NSQF - Revised 2022) R.T. Ex.No. 1.5.45 137