English Glossary

Since 02.06.2017

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R

rotor

Rotating component of an electrical machine.

rotor diameter

The rotor diameter describes the diameter of the circle that is swept by the blades of a wind turbine. As a rule of thumb, doubled rotor diameter quadruples the wind turbines rated power output.

roughness length

A parameter of some vertical wind profile equations that model the horizontal mean wind speed near the ground; in the log wind profile, it is equivalent to the height at which the wind speed theoretically becomes zero.

RSC

ratio between standard deviation and correlation

RTU

remote terminal unit

run-of-river

Refers to a type of small hydropower plant which has little or no water storage

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