A simple transmission line has a resistance of 1 ohm and a reactance a...
Calculation of Voltage and Power Factor
To calculate the voltage and power factor, we can use the following formulas:
- Apparent power (S) = real power (P) / power factor (PF)
- Voltage (V) = square root of (P / (3 * PF * R))
- Power factor (PF) = P / (sqrt(3) * V * I)
Given values:
- Resistance (R) = 1 ohm
- Reactance (X) = 2.5 ohm
- Real power (P) = 750 kW
- Power factor (PF) = 0.8
Using the formula for apparent power:
S = P / PF = 750 kW / 0.8 = 937.5 kVA
Using the formula for voltage:
V = sqrt(P / (3 * PF * R)) = sqrt(750 kW / (3 * 0.8 * 1 ohm)) = 649.5 V
Using the formula for power factor:
PF = P / (sqrt(3) * V * I)
Since we know the real power and power factor, we can solve for the current (I):
I = P / (sqrt(3) * V * PF) = 750 kW / (sqrt(3) * 649.5 V * 0.8) = 814.57 A
Now we can plug in the values for voltage and current to find the power factor:
PF = P / (sqrt(3) * V * I) = 750 kW / (sqrt(3) * 649.5 V * 814.57 A) = 0.8
Therefore, the voltage is 649.5 V and the power factor is 0.8.
Output of the Generator
The output of the generator can be calculated using the formula:
Output = S / PF = 937.5 kVA / 0.8 = 1171.88 kVA
Therefore, the output of the generator is 1171.88 kVA.