Page 422 - Electrician -1st Year - TT

ùNLiP¬ Lô«≠u ÑtßdL°u 37 SWG L]m ùLôiP ©ûWU¬ ûY«u¥e¡u
Gi¦dûLûV LQd¡ÓRp. ùNm× Lm©«u ÑtßLs 3187, Utßm 19 SWG
L]m ùLôiP ùNLiP¬ ÑtßLs 88
6
N 2 = = 80 turns (approx.) ÑtßYRtÏ Øu úUtLiP ÑtßLs Ñt\
0.0753
Ø¥ÙUô GuTûR N¬ TôodLÜm.
10% ªu]ÝjR Årf£dLôL áh¥]ôp
ûY«u¥eûL ÑtßYRtÏ Øu]o AûR
N = 88 ÑtßLs
2 ¾oUô²dL úYiÓm.
T¥¨ûX 6 (STEP NO.6 ): Cu×h §\àdúLtT
ûY«u¥e Lm©«u A[ûY LQd¡ÓRp Ø¥ÜûW (Conclusion): GÓjÕdLôh¥p
GÓjÕd ùLôiP ¥Wôuv@TôoUo
P = E x I ; I = P/E GÓjÕdLôh¥u T¥
ûY«u¥e¡u U§l×Ls
©ûWU¬ ªuú]ôhPm = I = 15/240 = 0.0625A
1
ùNLiP¬ ªuú]ôhPm = I = 15/6 = 2.5A. ¥WôuvTôoU¬u úWh¥e
2
2
©ûWU¬ Lm©«u ÏßdÏf Ñtß 3A/mm G] ©ûWU¬ ªu]ÝjRm - 240V
LÚj§p ùLôiÓ ªuú]ôhP APoj§ûV ùNLiP¬ ªu]ÝjRm - 6V
LQd¡Pp.
@l¬dÏYu£ - 50 Hz
A = 0.0625/3 = 0.020833 ª.Á 2
Cu×h úYôph Bm©Vo - 15 VA
®hPm = 0.1628 ª.Á
= 0.160 ª.Á.®hPm or 37 SWG úLôo (Core): úLôo TWlT[Ü 20 x 21 ª.Á
úRôWôVUôL T¥¨ûX 3þp ϱl©PlThPÕ.
ùNLiP¬ Lm©«u ÏßdÏ ùYhÓ TWlT[Ü Tô©u (Bobbin): ALXm 20.6 ª.Á, EVWm
3A/mm G]d ùLôiÓ ªuú]ôhP 21 ª.Á, ¿[m 26.7 ª.Á. @©ú[ugf£u ùUôjR
2
APoj§ûV LQd¡Pp. EVWm 42.7 T¥¨ûX 7þp ϱl©PlThPÕ.
A = 2.5/3A = 0.8333 ª.Á 2 Lm©«u A[Ü Utßm ÑtßLs (Wire sizes

®hPm = 1.029 ª.Á and turns): ©ûWU¬ 3187 ÑtßLs, A[Ü 0.16ª.Á
= 1.00 ª.Á.®hPm or ApXÕ 37 SWG , ùNLiP¬ 88 ÑtßLs A[Ü
19 SWG úRôWôVUôL 1.00ª.Á ApXÕ 19 SWG.
T¥¨ûX 7 (STEP NO.7 ): Fig 3þp ùTôÕYô] vúPm©e (Stampings): JqùYôÚ RLh¥u
Tô©²u A[ÜLs ùLôÓdLl ThÓs[]. §iûU 0.35 ª.Á Gu\ôp ùUôjR vúPm©e
G]úY EI 60/21 Tô©u úRoÜ ùNnVlThPÕ. §iûU 21ª.ÁdÏ, 60 RLÓLs
SÓLôXõu ALXUô] 21 ª.Á Utßm ALXm úRûYlTÓ¡\Õ. B]ôp CûPùY°ûV
20 ª.ÁdÏ ùTôÚjRUô]RôÏm. LÚj§p ùLôiÓ 55 RLÓLs UhÓúU
úTôÕm. G]úY, 0.35ª.Á §iûUÙûPV 55
Fig 3
GiLs EI 60/21 YûLûV YôeLXôm.
ûY«u¥e ùNnR ¥Wôuv@TôoUûW
BnÜ ùNnRp (Testing of transformer after re-
winding): úLôo AûUl©p ûY«u¥e
×Õl©jR ©\Ï, úLôo CßdLm Utßm Lô«p,
ûY«u¥e Øû]VeLs úTôu\ûYLû[
BnÜ ùNnV úYiÓm.

CuÑúX`u ªuRûPûV BnÜ ùNnRp
(Insulation resistance test ): 500 úYôph ùUdLûW
TVuTÓj§ ûY«u¥tÏm Utßm úLôÚdÏm
T¥¨ûX 8 (STEP NO.8): ûY«u¥e¡u
CûP«Ûs[ CuÑúX`u ªuRûPûV
TϧdÏs GqY[Ü ©ûWU¬ Utßm
A[dLÜm. ùUdLo A[Ü Ø¥®≠VôL (infinity)
ùNLuP¬ ÑtßLs APeÏm GuTûR N¬
CÚjRp úYiÓm. GdLôWQjûRd
TôodLÜm.
ùLôiÓm JÚ ùULô KmvdÏ Ïû\YôL
CÚjRp áPôÕ.

402 TYo : GXdh¬μVu (NSQF - Revised 2022) R.T. Ex.No. 1.12.105