" But when along train of abuses and usurpations, pursing inviably the same object, evinces a design to reduce them under absolute despotism , it is their right, it is their duty to throw of such their goverment and provide new guards for their fucture security."

ေမာ္တာ တြက္ခ်က္နည္း

Estimation of Motor Loading
AC ေမာ္တာတစ္လံုး၏ Part Load Efficiency သည္ ထုိေမာ္တာ၏ Loading (%) ေပၚတြင္မူတည္သည္။ ထုိေၾကာင့္ AC ေမာ္တာတစ္လံုး၏ Part Load Efficiency ကိုတြက္ရန္ အတြက္ ထုိေမာ္တာ၏ Loading (%)ကိုသိရန္လုိအပ္သည္။ Loading (%)ကိုသိမွသာ Efficiency အမွန္ကန္ဆံုး တြက္ခ်က္နုိင္သည္။
ေမာ္တာ၏ Loading (%) ကို နည္း ၂ နည္း ၿဖင့္တြက္ခ်က္နုိင္သည္။
က) Input Method (ေမာ္တာ၏ Input Electrical power ႏွင့္ Output Mechanical Power ကို ရယူၿပီး ေမာ္တာ၏ Loading (%) ခန့္မွန္းနည္း)
ခ) Slip Method (ေမာ္တာ၏ Rated Slip ႏွင့္ Actual Slip ကို ရယူၿပီး ေမာ္တာ၏ Loading (%) ခန့္မွန္းနည္း)

Input Method ဥပမာ
22kW (Name Plate Power) ေမာ္တာတစ္လံုးသည္ ေမာင္းႏွင္ေနသည္အခါ ေအာက္ပါ လွ်ပ္စစ္ အခ်က္အလက္မ်ားကို တုိင္းတာရယူခဲ့သည္။ ထိုေမာ္တာ၏ 100% Load သို့မဟုတ္ Full load Efficiency သည္ 88% ၿဖစ္လွ်င္ ထုိေမာ္တာ၏ Loading (%) ကို ရွာပါ။
Volt (R to Y) = 410 volt , I red phase = 25 amps , Power Factor for Red Phase = 0.86
Volt (Y to B) = 415 volt , I red phase = 27 amps , Power Factor for Red Phase = 0.88
Volt (B to R) = 412 volt , I red phase = 26 amps , Power Factor for Red Phase = 0.87

22kW (Name Plate Power သည္ Output Mechanical Power ပင္ၿဖစ္သည္။ Rated Power ဟုလည္းေခၚသည္။) ေမာ္တာတစ္လံုး၏ Input Electrical Power မွာ 25 kWe ၿဖစ္သည္။ေမာ္တာ၏ 100% Load သို့မဟုတ္ Full load Efficiency သည္ 88% ၿဖစ္လွ်င္..
Input Electrical Power of Motor =( Output Mechanical Power or Name Plate Power = 22 ) x 0.88 = 25kWe
ေမာ္တာ၏ Actual Electrical Power မွာ
Actual Electrical Power = 1.73 x Average Volt x Average I x Average Power Factor
                                       1.73x 413.33 Volt x 26 Amp x 0.87 = 16.17 kWe

  Actual Electrical Power = 16.17 kWe
Motor Loading = --------------------------------------------------
  Rated Electrical Power = 25kWe
Motor Loading = 64.68 %
 
Slip Method ဥပမာ
ဆက္လက္ေရးရန္

ေကာင္းထက္ညြန့္

No comments:

Post a Comment

အခုလို လာေရာက္အားေပးၾကတာ အထူးပဲ ၀မ္းသာ ပီတိျဖစ္ရပါတယ္ဗ်ား ... ။ေက်းဇူးအထူးတင္ပါတယ္။
ေက်ာ္ထက္၀င္း နည္းပညာ (ဘားအံ)
www.kyawhtetwin.blogspot.com

Related Posts Plugin for WordPress, Blogger...