Ac machine numerical
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Ac Machine 2 nd Last Numerical: 10KVA, 2000/400V, Single Phase has following data. R1=5 Ω, R2=0.2 Ω, X1=12 Ω, X2=0.48Ω Determine SY terminal Voltage at full load 0.8 Power factor lagging, when PY= Supply voltage is 2000V. Solution: Referred to SY…… R02= R2+K 2 R1 X02=X2+K 2 X1 K 2 = R2/ R1 or K 2 = X2/ X1 >> K 2 =0.2/5=0.04 >> R02=0.2+ (0.04)5 = 0.4 >> X02= 0.48+ (0.04)12 = 0.96 Secondary Voltage Drop equation: SY I2 =KVA rating/Rating Secondary Voltage = 10KVA/400= 25A VD=I2 (R02 cosφ + X02 sinφ) = 25(0.4* 0.8+ 0.96*0.6) = 22.4 Volts Now we can say that Actual secondary voltage will be 400-22.4 = 377.6 Volts www.UsmanJavedSial.blogspot.com www.Slideshare.net/ItsSiaL
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Transcript of Ac machine numerical
Ac Machine 2nd Last Numerical: 10KVA, 2000/400V, Single Phase has following data.
R1=5 Ω, R2=0.2 Ω, X1=12 Ω, X2=0.48Ω
Determine SY terminal Voltage at full load 0.8 Power factor
lagging, when PY= Supply voltage is 2000V.
Solution: Referred to SY……
R02= R2+K2 R1 X02=X2+K2X1
K2= R2/ R1 or K2= X2/ X1
>> K2=0.2/5=0.04
>> R02=0.2+ (0.04)5 = 0.4
>> X02= 0.48+ (0.04)12 = 0.96
Secondary Voltage Drop equation:
SY I2 =KVA rating/Rating Secondary Voltage
= 10KVA/400= 25A
VD=I2 (R02 cosφ + X02 sinφ)
= 25(0.4* 0.8+ 0.96*0.6) = 22.4 Volts
Now we can say that Actual secondary voltage will be
400-22.4 = 377.6 Volts
www.UsmanJavedSial.blogspot.com
www.Slideshare.net/ItsSiaL
