Page 303 - Electrician 1st year - TP

6 T§Ü ùNnVlThP G]o_õûV ¸úZ
CuPd¥q TÞ®tÏ Fig -4p
RWlThÓs[ ãj§Wj§uT¥
Lôi©jÕs[T¥ CûQlûT
LiÓ©¥dLÜm.
EiPôdLÜm.
I.S. 722 (Part III) 1977 uT¥ NR®¡R ©ûZ
UPF Utßm 0.5 lagging CWi¥Ûm ± 2%
dÏ Ïû\YôL CÚdLúYiÓm.

I.S.ϱl©hÓs[ A[ÜLû[®P
A§LUô] ©ûZLs CÚl©u G]o_õ
ÁhPûW calibration ùNnV

ªuNôWYô¬V ÁhPo Utßm ¬úX
7 ©ûZûV ¸úZ RWlThÓs[ ãj§WjûR úNôRû] Õû\«u êXUôL
ETúVô¡jÕ LiÓ©¥dLÜm. SPY¥dûL GÓdLÜm.
Error = Recorded energy (R) - True energy (A).

8 NR®¡R ©ûZûV LiÓ©¥dLÜm.
CeÏ R − A
Percentage error = × 100
A

R = ÁhPWôp T§Ü ùNnVlThP
ªu]ôt\p
A = EiûUVô ªu]ôt\p

9 Y.Gi. 2 ØRp 8YûW«Xô]Yt±dÏ 50%
75%, 100% ªuRûP Utßm CuPd¥q
TÞûY EiPôd¡ UßT¥Ùm ùNnVÜm.
AhPYûQ -1p T§Ü ùNnVÜm.

AhPYûQ 1
SI. Load Voltmeter Ammeter P.F. meter Time True energy Revolution Meter Recorded %
No. reading reading reading reading in Sec counted constant energy error
N K
Resistive
1 25%
2 50%
3 75%
4 100%

Inductive
1 25%
2 50%
3 75%

4 100%

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