What is the formula used to calculate frequency of a generating turbine?

The formula used to calculate the frequency of a generating turbine is derived from the relationship between the number of poles, the rotation speed (in revolutions per minute or RPM), and the conversion to hertz (Hz). The correct formula is F = P × RPM divided by 120, where F represents the frequency in hertz, P is the number of poles of the generating turbine, and RPM is the rotational speed.

This calculation is essential for understanding how many cycles of electricity are generated in one second. In electric generators, the interaction between magnetic fields and conductors produces alternating current (AC), which is measured in frequency. The division by 120 is necessary because there are 60 seconds in a minute and the factor accounts for the bipolar nature of AC generation, as each complete rotation of the turbine generates two alternating cycles (one positive and one negative).

Understanding how frequency relates to the design and operation of turbines is crucial for maintaining efficient power generation systems, making this formula a vital component in the study of steam engineering.