Use of Capacitors for Generators

In summary, two different electrical consultants have given conflicting advice on how to improve the power factor of Gensets. The first suggested installing a 90 KVAR power capacitor and an automatic power factor control panel, while the second advised using smaller capacitors at the motor during Delta running. After following the second consultant's advice and installing smaller capacitors for specific motors, the power factor improved from 0.65 to 0.72. The correct procedure for capacitor installation is still unclear, but it is recommended to use smaller capacitors near the loads to avoid high currents.
  • #1
mgSathish
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When we run our Gensets individually, we are getting a Power Factor of 0.55 and 0.65 for our 250 KVA and 365 KVA Gensets respectively.3. An Electrical Engineer advised us to install a 90 KVAR Power Capacitor and an Automatic Power Factor Control Panel to get a PF of 0.85 for our existing load, to improve the Power Factor when running on Gensets.4. Alternately, another Electrical Consultant advised us that there will be extra load on the Alternators during operation if big Capacitors are installed in the Power Factor Control Panel; rather to use smaller capacitors at the motor, which we will operative only during Delta running of the motors. We have installed a 15 KVAR Capacitor for our 40 HP motor and another 12.5 KVAR Capacitor for our 30 HP motor, only during Delta running. This has improved the Power Factor on our Generators from 0.65 to 0.72.5. We are confused about two opposite views. Please guide us regarding the correct procedure for Capacitor installation, to ensure a long smooth life of our Gensets.
 
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  • #2
I think Consultant 2 is right. Charging capacitors can lead to rather high currents, so it´s advisable to use smaller ones close to the loads.
 
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1. How do capacitors help in the functioning of generators?

Capacitors are used in generators to store and release electrical energy. When the generator is running, the capacitor charges and stores electrical energy. This stored energy is then used to provide a continuous and stable flow of electricity to power devices.

2. Can capacitors improve the efficiency of generators?

Yes, capacitors can improve the efficiency of generators by providing a stable and constant flow of electricity. This helps in reducing voltage fluctuations and prevents power surges, which can damage electrical devices. Additionally, capacitors can also help in reducing the overall energy consumption of the generator.

3. What types of capacitors are commonly used in generators?

The two most commonly used capacitors in generators are start capacitors and run capacitors. Start capacitors are used to provide an initial boost of power to start the generator, while run capacitors are used to maintain the generator's electrical output during operation.

4. How do I determine the right size of capacitor for my generator?

The size of the capacitor needed for a generator depends on various factors such as the generator's voltage and power output, the type of load it will be powering, and the frequency of operation. It is best to consult a professional electrician or refer to the generator's manual for guidance on selecting the appropriate capacitor size.

5. Are there any safety precautions to keep in mind when using capacitors in generators?

Yes, it is important to handle capacitors with caution as they store electrical energy and can potentially cause electric shocks. Make sure to discharge the capacitor before handling it and always follow the manufacturer's instructions for installation and maintenance. It is also recommended to use capacitors that are specifically designed for use in generators to ensure proper functioning and safety.

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