Current Rating of an AC Generator

In summary, the current rating in an AC generator is determined by the first equation: kW = V*I*PF*sqrt(3). The power factor of the load is a factor in this equation. For a 875kVA generator with a power factor of 0.8, the kW would be 700. The formula also includes the voltage, with an example of 2400 volts given. This formula can be used to determine the current rating of the generator.
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Hello,

I'm a bit confused on the term current rating in an ac generator. Is it the one in that I can get in the formula:
kW= V*I*PF*sqrt(3) ? or the one in kW= V*I*sqrt(3)? The problem is the data that I have is V, PF, kVA only. I can compute the kW using those data but I'm abit confused on those formulas.

Also, I've read in some books that there are times that if the generator is 3 phase, the formula has a sqrt(3) why is that so?

Thanks!
 
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  • #2
It's the first equation. Naturally that means the power depends on the power factor of the load.
 
  • #3
russ_watters said:
It's the first equation. Naturally that means the power depends on the power factor of the load.

So for example I have a 875kVA and a .8 power factor, my kW will then be 700 kW right?

According to the first equation, If I have a volts of 2400, it will be 700 kW = 2400 * I * .8 *sqrt(3)
That way I can have the current rating?
 

1. What is the current rating of an AC generator?

The current rating of an AC generator refers to the maximum amount of electric current that the generator can produce at a given voltage and frequency. It is typically measured in amperes (A) and is determined by the design and construction of the generator.

2. How is the current rating of an AC generator determined?

The current rating of an AC generator is determined by factors such as the size and type of the generator, the speed at which it rotates, and the strength and type of its magnetic field. It can also be affected by external factors such as temperature and load conditions.

3. Can the current rating of an AC generator be increased?

Yes, the current rating of an AC generator can be increased by either increasing the size and strength of its components or by connecting multiple generators in parallel. This allows for a higher total current output and is commonly used in large power plants to meet high electricity demands.

4. What happens if the current rating of an AC generator is exceeded?

If the current rating of an AC generator is exceeded, it can lead to overheating and damage to the generator's components. This can result in a decrease in its efficiency and lifespan, or even a complete failure of the generator. It is important to ensure that the load on the generator does not exceed its current rating.

5. How does the current rating of an AC generator affect its power output?

The current rating of an AC generator directly affects its power output, as the power generated is equal to the product of voltage and current. A higher current rating allows for a higher power output, while a lower current rating will result in a lower power output. This is why it is important to select a generator with an appropriate current rating for the desired power output.

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