Universal Hydraulic Machines Experimental Platforms
The three testing platforms at TES laboratory are planed to test Francis, Kaplan Turbine, Pump-Turbine and Storage Pumps. They are equipped with high-precision measuring instruments to be suitable for both development and acceptance tests as required by the IEC 60193 standard. A direct current generator/motor is installed for each test rig that can operate in the 4 quadrants: generator in 2 directions and motor in 2 directions. Automated test rig processes and years of testing experience allow for quick performance assessment, potentially shortening development times without diminishing quality.
First Stage Francis-Pump Turbine
Measuring instruments used
The measuring instruments used for acceptance tests must meet stringent precision requirements and must undergo official and in-house calibration (repeat calibration cycles recommended in DIN EN ISO 9906). These precision requirements are defined by the test class of the acceptance standard that is used.
Pressure measurements
- In general, the following measurements are sufficient on a test facility: electronic pressure transmitters, pressure sensors and spring pressure gauges (class 0.25). Within this context, the standard maximum error level permitted for the instrument is 0.15 % of the full scale deflection.
- In special cases, such as when recording processes (e.g. non-steady flow), suitable and/or miniaturized sensors and data loggers are installed for high-frequency recordings.
Measuring flow rates
- On the test facility standardized throttles in accordance with ISO 5167 (Standard orifice plate, Standard nozzle and Standard Venturi nozzle) as well as instruments for measuring velocity MIF (magnetic-inductive flow metering) are installed.
Power measurements
- For very precise measurements on the test facility, the torque meters between the generator and turbine is installed. This is generally done in conjunction with speed measurement.
Speed measurements
- Speed measurements are taken on the Universal Hydraulic Machines test facility using digital counters which count discrete pulses with every revolution. Usually 60 pulses per revolution are selected together with a count period of 1 second, it is possible increase the accuracy adopting 360 pulses per revolution.
Special measuring devices
- Special requirements sometimes apply when taking noise and vibration measurements, NPSH measurements, and when carrying out model testing in water, rolling element and plain bearing tests, endurance tests.
- In special cases, vibration, pressure pulsation measurements are taken using miniaturized sensor flush mounted.h facility, utilizing the latest measuring instruments and technical advancements to produce data that easily and consistently complies with all IEC 60193 standards.
