Page 402 - Electrician -1st Year - TT

úLôo CZl©tÏ NUm. ÑûUVt\ ÑtßLû[ EûPVÕ. ªu]ÝjRm/ Ñt±u
ªuú]ôhPm ªLf £±V A[YôÏm. G]úY ®¡Rm Juß úTôp CÚdÏm. CR]ôp
ùNm× CZl× RsÞT¥ ùNnVlTÓ¡\Õ. úLô¬p LôkRl×Xm CÚTdLm Ju\ôÏm.
Fig 1þp Yôh ÁhP¬p ϱl©ÓYÕ úLôo úLôo CZl× A§L LôkRl×XjûR
CZlTôÏm. úYôph ÁhP¬p ϱl©ÓYÕ A¥lTûPVôLd ùLôiPÕ.
A§p ùNpÛm ªu]ÝjRj§u U§lTôÏm.
§\kR Ñtß Bn®p Cu×h AûXùYi,
¥Wôuv@TôoU¬u YûWVßdLlThP
AûXùYi BÏm.

EiûUVô] CÚm× CZl× (W) ¸rLiP
i
ãj§WjûR TVuTÓj§ LQd¡PXôm.
CÚm× CZl× = W = W - no load copper
1 0
loss
2
CÚm× CZl× = W - (I ) R
o 0
W 0 = Wattmeter reading on no load
úLôo CZl× ¥Wôuv@TôoU¬u CÚ No Load copper loss = (I ) R
2
TdLeL°Ûm A[dLXôm. ERôWQUôL 3300/ 0
R = Resistance of winding in which
240 úYôph ¥Wôuv@TôoUûW BnÜ
the OC test calculated
ùNnÙm úTôÕ ùNLiP¬«p 240 úYôph
I = No - load current
YZeLlTÓ¡\Õ. ùNLiP¬ Ïû\kR 0

¥Wôuv@TôoU¬u ÏßdÏ Ñtû\ BnÜ ùNnRp (Short circuit (S.C) test of a
transformer)

úSôdLeLs: ClTôPj§u Ø¥®p ¿eLs ùT\ úYi¥V A±Ü §\uLs
• £e¡s úTv ¥Wôuv@TôoU¬u ÏßdÏf Ñtû\ BnÜ ùNnÙm Øû\ûV ®[dÏRp
• A§L ªu]ÝjR Ñt±p CûQUôtß ªuRûP Utßm CûQUôtß G§o ®û]ûV
LQd¡ÓRp
• ùNm× CZlûT LQd¡Pp.

ÏßdÏ Ñtß úNôRû] (Short circuit test): ªu]ÝjRj§p £±V NRÅRm YZe¡ BnÜ
ÏßdÏ Ñtß Bn®u ªuÑtß Fig 1þp ùNnVlTÓ¡\Õ. YZd¡p 3300/240 úYôph
Lôi©dLlThÓs[Õ. Ïû\kR ªu]ÝjRm ¥Wôuv@TôoU¬p 5% of 240V úYôph
Es[ TdLj§p ¥Wôuv @TôoU¬p ÏßdÏf A[ûYd Lôh¥Ûm 5% of 3300V úYôph¥p
Ñtß HtTÓjRlTÓ¡\Õ. BnÜ ùNnYRôp Õp≠V A[Ü ¡ûPdÏm.

©ûWU¬ ªu]ÝjRm A§LUôL
A§L ªu]ÝjRØs[ ûY«u¥e¡p Ïû\YûPÙm úT#ôÕ LôkRl×XØm AúR
U§l©PlThP ªuú]ôhPm AmÁhPo A[®tÏ Ïû\¡\Õ. úLôo CZl×
Y¯VôL TônYRtÏ Ht\ôt úTôp Ïû\kR LôkRl×Xj§u CÚT¥ (square) dÏ úSo
ªu]ÝjRm YZeLlTÓ¡\Õ. CkR ¨ûX«p ®¡Rj§p CÚdÏm. CÕ SûPØû\«p '0'
¥Wôuv@TôoU¬u Cm©Puv CdÏYXuh YôÏm.
Cm©Puv BÏm. (Fig 2) G]úY Cu×h ªu§\u LÚ®«p ùNm×
CkR BnÜ A§L ªu]ÝjRØs[ CZl©u A[ûYd ϱl©Óm. AÜh×h
ûY«i¥e¡p YûWVßdLlThP
382 TYo : GXdh¬μVu (NSQF - Revised 2022) R.T. Ex.No. 1.12.99 & 100