Flow rate measurements with propeller type current meters
The procedures are described in the IEC (International Electrotechnical Commission) standard 60041 "field acceptance tests to determine the hydraulic performance of hydraulic turbines, storage pumps and pump turbines".
The following three images depict a typical installation, which was performed with current meters fixed in the stop log notches in the intake of a low head hydro plant.
Properties of flow rate measurements with current meters:
- determination of absolute efficiency
- suited for pumps and turbines
- no restrictions regarding head