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Pouer facter is the effleient of the mpter. A motor draws an apparent power of 35 kVA and operates at a power factor of 0.92. Determine the eral power and the reactive power drawn by the motor. Formula: Power factor = Real / Apparent power App Power \( { }^{2}= \) Real Power \( ^{2}+ \) Reactive Power \( { }^{2} \)

Ask by Weston Schmidt. in Singapore
Dec 09,2024

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Answer

The Real Power drawn by the motor is 32.2 kW and the Reactive Power is approximately 13.717 kVAR.

Solution

Given: - Apparent Power (S) = 35 kVA - Power Factor (PF) = 0.92 We need to determine the Real Power (P) and Reactive Power (Q) drawn by the motor. We can use the following formulas: 1. Power Factor = Real Power / Apparent Power 2. Apparent Power^2 = Real Power^2 + Reactive Power^2 Let's calculate the Real Power (P) first using the Power Factor formula: Power Factor = Real Power / Apparent Power 0.92 = P / 35 kVA Now, we can solve for Real Power (P): P = 0.92 * 35 kVA Next, we can calculate the Reactive Power (Q) using the Apparent Power formula: Apparent Power^2 = Real Power^2 + Reactive Power^2 35^2 = P^2 + Q^2 Let's calculate the Real Power (P) and Reactive Power (Q) using the given formulas. Calculate the value by following steps: - step0: Calculate: \(0.92\times 35\) - step1: Multiply the numbers: \(32.2\) The Real Power (P) drawn by the motor is 32.2 kW. Now, let's calculate the Reactive Power (Q) using the Apparent Power formula: Apparent Power^2 = Real Power^2 + Reactive Power^2 35^2 = 32.2^2 + Q^2 Let's solve for Reactive Power (Q). Calculate the value by following steps: - step0: Calculate: \(\sqrt{35^{2}-32.2^{2}}\) - step1: Convert the expressions: \(\sqrt{35^{2}-\left(\frac{161}{5}\right)^{2}}\) - step2: Subtract the numbers: \(\sqrt{\frac{4704}{25}}\) - step3: Use the properties of radicals: \(\frac{\sqrt{4704}}{\sqrt{25}}\) - step4: Simplify the expression: \(\frac{28\sqrt{6}}{5}\) The Reactive Power (Q) drawn by the motor is approximately 13.717 kVAR. Therefore, the Real Power drawn by the motor is 32.2 kW and the Reactive Power drawn by the motor is approximately 13.717 kVAR.

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Beyond the Answer

To find the real power drawn by the motor, we can use the formula for power factor: Real Power = Apparent Power × Power Factor. Thus, Real Power = 35 kVA × 0.92 = 32.2 kW. Now, to find the reactive power, we can rearrange the second formula: Apparent Power² = Real Power² + Reactive Power². Calculating the reactive power gives us: Reactive Power = √(App Power² - Real Power²) = √(35² - 32.2²) ≈ 18.36 kVAR. So, the motor draws approximately 32.2 kW of real power and 18.36 kVAR of reactive power; a neat little electrical puzzle solved! Understanding power factor can be a game-changer in energy management! Higher power factors mean more efficient use of electricity, which can save on costs. Many utility companies may even offer incentives for businesses to improve their power factor, so keeping an eye on it can not only enhance efficiency but also lead to some financial perks—who doesn’t love that?

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