Page 316 - Electrician -1st Year - TT

ªè£œÀ‹. Þ‚è¼MJ™ «ðù£ å¡Á
è†ìˆî£œ «ñ™ ï蘉¶ ñFŠ¬ð å¼
°PŠH†ì «ïóˆF™ õ¬ó‰¶ ¬õ‚°‹.
Þ‚è¼MJ¡ àîMò£÷˜ Ü÷M¡ ñFŠ¬ð
â‚è£ôˆF½‹ 𣘈¶ ªîK‰¶ ªè£œ÷ô£‹.
ðF¾ «õ£™† e†ì˜ Ü‹e†ì˜ ñŸÁ‹
ðõ˜ «ð‚ì˜ e†ì˜ Þšõ¬è‚ è¼M¬ò„
꣘‰î¶. (Fig 4)
Fig 3
Energy meter
I¡ Ü÷‚°‹ è¼MèO™ I¡«ù£†ì‹
𣻋 «ð£¶ ãŸð´‹ M¬÷¾èœ (Effects
of electric current used on electrical instruments):
ùNLiP¬ LÚ®L°p I¡ ÝŸø™ 𣻋
«ð£¶ ãŸð´‹ ð™«õÁ M¬÷¾è¬÷‚
ªè£‡´ HK‚èŠð†´œ÷¶. ܬõ,
– 裉î M¬÷¾ (Magnetic effect)
– ªõŠð M¬÷¾ (Heating effect)
– «õF«Vp M¬÷¾ (Chemical effect)
– G¬ô I¡Qò™ M¬÷¾ (Electrostatic effect)
– I¡è£‰î ɇ´î™ M¬÷¾ (Electro Magnetic
induction)
²†®‚ 裆´‹ è¼M‚° «î¬õò£ù
M¬êèœ (Essential forces required for an indicating
instrument): Þ‚è¼MèO¡ Þò‚èˆFŸ°
W›‚è‡ì Í¡Á M¬êèœ «î¬õ. ܬõ,
– Mô‚° M¬ê (Ü) Þò‚è M¬ê (deflection
force)
– 膴Šð£†´ M¬ê (controlling force)
– å´‚è™ M¬ê (damping force)
296 TYo : GXdh¬μVu (NSQF - Revised 2022) R.T. Ex.No. 1.10.83
Mô‚è M¬ê (Deflection force): ÞšM¬ê
è¼MJ¡ ï輋 ð£èˆ¬î '0' G¬ôJ™ Þ¼‰¶
ïèó„ ªêŒ»‹. ÞšM¬ê ãŸð´õ
I¡«ù£†ìˆFù£™ 裉î M¬÷¾ ªõŠð
M¬÷¾ ñŸÁ‹ «õF«Vp M¬÷¾ Íô‹
Mô‚è M¬ê ãŸð´ˆî º®»‹.
膴Šð£†´ M¬ê (Controlling force):
ÞšM¬ê, è¼MJ™ ²ö½‹ ð£èˆ¬î
膴Šð´ˆF ºœ 裆® Íô‹ Ü÷‚è
àî¾Aø¶. ÞšM¬ê Þò‚è M¬ê¬ò
âF˜‚°‹. «ñ½‹ CRu ºœ÷£ù¶ Þò‚è
M¬ê cƒAò àì¡ ²N (Zero) G¬ô¬ò ܬìò
àî¾Aø¶.
ÞšM¬ê¬ò W›‚è‡ì º¬øJ™ ªðø
º®»‹.
– ¹M ߘŠ¹ M¬ê 膴Šð£´ (Gravity control)
– v©¬e 膴Šð£´ (spring control)
¹M ߘŠ¹ 膴Šð£´ (Gravity control):
Þšõ¬èJ™ Þó‡´ CPò â¬ì»œ÷
ªð£¼¬÷ ºœO¡ âF˜ð‚èˆF™
Þ¬í‚èŠð†®¼‚°‹. ÌIJ¡ ¹Mf˜Š¹
M¬êò£™ ÜŠªð£¼œ ߘ‚èŠð†®¼‚°‹.
Üîù£™ 膴Šð£†´ M¬ê¬ò
ãŸð´ˆ¶A¡ø¶. Þšõ¬è‚ è¼Mèœ
ªêƒ°ˆî£è ðò¡ð´ˆî «õ‡´‹. (Fig 5)
ELN259234
Þ‚è¼M ÝŸø½ì¡ Þ¬í‚è£îªð£¿¶
CPò â¬ì ªð£¼O¡ Íô‹ ºœ÷£ù¶ '0'
G¬ôJ™ Þ¼‚°‹. I¡êŠ¬÷  ªð£¿¶
ºœ÷£ù¶ 膴Šð£†´ M¬ê¬ò âF˜ˆ¶
LÚ®«p ï蘉¶ ñFŠ¬ð 裆´‹. ¹Mf˜Š¹
M¬êò£™ CPò â¬ìªð£¼œ è¼MJ¡
²ö½‹ ð£èˆFŸ° 膴Šð£†´ ²ö™
M¬êò£è ðò¡ð´Aø¶.
v©¬e 膴Šð£´ (Spring control) (Fig 6):
Þšõ¬è«p ªð£¶õ£è Þó‡´ ð£vð˜
Hó£¡v Ü™ô¶ ªðKLò‹ 裊ð˜ v©¬e A
Utßm B ªè£‡®¼‚°‹. Þ‰î ªñ™Lò
vHKƒA¡ àœº¬ù ì¡