Motor Kompanzasyonu İçin Kaç kVAr Gerekir?
Capacitor power required for the motor. Qc = P·(tanφ₁−tanφ₂) It is found with the capacitor directly connected to the motor terminal. Overcompensation should be avoided. — The capacitor should not exceed the motor's no-load magnetization strength (risk of self-excitation); therefore, the target cosφ is generally kept at 0.95.
Qc = P·(tanφ₁ − tanφ₂) · target cosφ ≤ ~0.95 in the motor
Example calculation: For a 15 kW motor, cosφ 0.80 → 0.95 → Qc = 15×(0.75−0.329) ≈ 6.3 kVAr (avoid overcompensation at the motor terminal).
Motor Compensation (kVAr)
Calculate the capacitor power required to bring a motor's power factor to its target value.
Required capacitor
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Notes: Qc = P·(tanφ₁−tanφ₂). Avoid overcompensation in the capacitor directly connected to the motor terminal. — The capacitor power should not exceed the motor's no-load magnetization (reactive) power; otherwise, there is a risk of self-excitation and overvoltage. Therefore, the target cosφ is generally kept around 0.95.
How is it calculated?
- Enter the engine power (kW).
- Enter the current and target cosφ values.
- Press Calculate.
Frequently Asked Questions
How is engine compensation calculated?
Qc = P·(tanφ₁−tanφ₂), where motor power and current/target power factor are used.
Why is overcompensation dangerous in an engine?
Excess capacitors directly connected to the motor terminal can lead to self-excitation and overvoltage.
What should the target cosφ be for the motor?
To prevent self-excitation, the target for motor individual compensation is generally kept around 0.95.
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