# Turbine rpm with generator load

• dilipbhanu
In summary, when the generator is attached to the hydro turbine, the final power and RPM will depend on the torque/power curve of the turbine. The weight of the generator alone will not change the power output, but it will affect how quickly it changes speed. The turbine is currently producing 10 hp at 600 rpm without the generator, and this will not change when the generator is connected. The generator will have some parasitic friction loss and electrical inefficiency when generating power.
dilipbhanu
Hi, I have developed a hydro turbine (reaction type) I am testing the turbine for 3 bar input pressure (30 meter head). The turbine diameter is 30 inches. Torque produced is 109 Nm with 600 RPM without the generator (no load). As per Torque and RPM, power available at shaft (without generator) is 10HP.

Question: How do I calculate final power / RPM when the generator is attached. Will the RPM reduce because of the weight of the generator. If yes, what will be the final RPM if a the generator weight is 15 KG

Are you intending to generate AC or DC?

dilipbhanu said:
Torque produced is 109 Nm with 600 RPM without the generator (no load). As per Torque and RPM, power available at shaft (without generator) is 10HP.
109 N.m (or 10 hp) is a load.
dilipbhanu said:
Question: How do I calculate final power / RPM when the generator is attached.
If the generator requires a 10 hp input @ 600 rpm, then your turbine will produce 10 hp @ 600 rpm.

If it requires less and your turbine is still producing 10 hp, the assembly will accelerate until the turbine's output equals the generator's input or when something will break.

If it requires more and your turbine is still producing 10 hp, the assembly will decelerate until the turbine's output equals the generator's input or when it completely stops.

If it the turbine produces 10HP (7.5KW) without the generator, it's not going to change when you connect it, just turning the generator.. There'll be a little parasitic friction loss from bearings and perhaps the cooling fan when it's not under a load, and when it is generating power, there'll be some electrical inefficiency as well (~20% loss at full power, greater percentage at partial loads probably).

You need to find the torque/power curve of the turbine to determine where it makes the most power.

The weight of the generator alone will not change the power output, it will only change how fast it changes speed (a heavier one will take longer to get up to speed)

## 1. What is the relationship between turbine rpm and generator load?

The turbine rpm and generator load have a direct relationship. As the load on the generator increases, the turbine must spin faster to generate more power.

## 2. How does changing the generator load affect the turbine rpm?

Changing the generator load will directly affect the turbine rpm. An increase in load will result in an increase in turbine rpm, while a decrease in load will result in a decrease in turbine rpm.

## 3. What factors can influence the turbine rpm with generator load?

There are several factors that can influence the turbine rpm with generator load, such as the design of the turbine, the type of fuel being used, the efficiency of the generator, and the environmental conditions at the turbine's location.

## 4. Is there an optimal turbine rpm for a specific generator load?

Yes, there is an optimal turbine rpm for a specific generator load. This is determined by the design and efficiency of the turbine, and it is important to operate within this range to ensure maximum efficiency and longevity of the equipment.

## 5. Can the turbine rpm and generator load be controlled independently?

Yes, the turbine rpm and generator load can be controlled independently. This allows for better management of the power generation process and can help optimize the efficiency of the turbine and generator.

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