Page 173 - Electrician -1st Year - TT

TYo (Power) T«t£ 1.5.49 dLô] ùRôPo× LÚj§Vp
GXdh¬μVu (Electrician) þ AC ªuÑtßdLs (AC Circuits)

£e¡s úTv CûQl©p ªu §\u, ªu]ôt\p §\u LôW¦ Utßm
LQdÏLs (Power energy and power factor in AC single phase system - problems)

úSôdLeLs: ClTôPj§u Cߧ«p ¿eLs §\m ùT\ CÚlTûY
• £e¡s úTv AûUl©p §\u Utßm §\u LôW¦dÏ Es[
ùRôPoûT áßRp
• úSW¥VôL A[dÏm LÚ®ûVd ùLôiÓ §\u LôW¦ûV
A[lTRtLô] TPjûR YûWRp Scan the QR Code to view
the video for this exercise
• Uôß §ûN ªuÑtßL°p PF Utßm ªu§\u ®]ôdLû[ ¾oÜ ùNnRp.

úSo (DC) ªuÑt±p §\u A[lTRtLô] JÚ Tϧ ªuú]ôhPm UhÓm
ãj§WUô]Õ : ªu]ÝjRjÕPu 90 ¥¡¬ úLôQ A[®p
– P = E x I watt (outer phase) þp CÚdÏm. AkR Tϧ UhÓm
–P = E / R watt. TVuTÓjRlTÓ¡\Õ. ùLlTô£hPÚm
2
úUtLiP ®§Lû[ LXlTPUt\ ªuRûP CuPdPÚm Uô± Uô± Nd§ûV úNªjÕ
UhÓúU Es[ UôߧûN ªuÑt±p ARû] ùLôÓjR CPj§túL Aàlס\Õ.
TVuTÓjÕm ùTôÝÕ EiûUVô] §\û] CRû] G§o®û] ªu§\u (Reactive power)
ùLôÓdÏm. UôߧûN ªuÑt±p ¬VôdPuv Gußm ARû] úYôph/Bm©Vo ¬Vôd¥q
®û[Ü CÚdÏm. ApXÕ "Yôov' (vars) Gußm AûZd¡ú\ôm.
ùUnVô] §\û]l úTôp ApXôUp ®û]j
UôߧûN ªuÑt±p §\u (Power in AC
§\u Nd§Vôp GkR TVàs[ úYûXÙm
circuit) : êuß YûLVô] §\uLs Uôß §ûN
ùNnV Ø¥VôÕ.
ªuÑt±p CÚdÏm.
úRôWôV §\u (Apparent power) : P = V x I
– Bd¥q TYo (EiûUVô] §\u) a
(True Power) CÕ ùUôjR ªu AÝjRm Utßm ªu
KhPj§u ùTÚdÏj ùRôûLVôÏm. CRu
– G§o®û] ªu §\u, (Reactive Power)
AXÏ úYôph Bm©Vo (VA) BÏm.
– úRôt\j§\u, (Apparent Power)
§\²u ØdúLôQm (The power triangle) : CÕ
Bd¥q TYo (EiûUVô] §\u)
UôߧûN ªuÑt±p êuß YûL §\uLû[
(True power) : CRû] LQd¡ÓY§p Uôß
AûPVô[lTÓjRlTÓ¡\Õ.
§ûN ªu ÑtßdÏm úSo ªu ÑtßdÏm
– YôhL°p EiûUVô] §\u (P)
CûP«p ®j§VôNm EiÓ. Bd¥q TYo
B]Õ V × I× Cos θ , G] LQd¡PlTÓ¡\Õ. –'Yôov'L°p ¬Vôd¥q TYo (G§o®û]j
§\u) (P )
C§p Cos GuTÕ §\u LôW¦ (TYo r
θ
úTdPo) BÏm. (CkR úLôQm ªu KhPm – úYôpÓ Bm©VoL°p úRôWôV §\u (P )
a
Utßm ªu AÝjRj§tÏ CûP«p Es[Õ) CÕ ùRôPo×Lû[ TYo ØdúLôQjRôp
CÕ ÑûU (Load) ÑjRUô] ªu RûP A±V Ø¥Ùm. (Fig 1)
CpXôRúTôÕ ¡ûPlTRôÏm. CR]ôp
ªuú]ôhPØm ªu]ÝjRØm
CuúTv³p CpXôUXõÚdÏm. AlT¥
CÚdÏm úTôÕ JÚ Tϧ ªuú]ôhPm
UhÓm ªu]ÝjRjÕPu CuúT³p
CÚdÏm úTôÕ UhÓm ªu§\û] (power)
EtTj§ ùNnÙm. CRû] Yôh ÁhP¬p
A[dLXôm.
G]úY,
G§o ®û] ªu§\u (Reactive power) : CÕ
2
2
2
§\u CpXôR ¨ûX BÏm (watt less power). P = P + P úYôph Bm©Vo (VA)
r
a
AeúL
P = V x I x Sin θ
r
153