Electrical equipment testing

DEWESoft is a perfect tool to capture and stream raw data as well as calculate power parameters during acquisition. Since a single instrument DEWESoft can calculate several power modules with different voltage levels or even different line frequency, it can calculate efficiency of equipment.

A typical example are frequency converters, where we can measure the power taken at the input and compare it to the power measured at the output. If we have for example electromotors, it is very easy to measure also output torque and RPM calculating mechanical power at the output.

All kinds of electronic appliances are tested with DEWESoft.

DEWESoft power module. All data from video to analogue is fully synchronized, allowing you to do precise measurement and testing.

Full bandwidth harmonics FFT and a full frequency FFT screens and calculations are available. Both support triggers on FFT events.

Fault recorder. Supports triggers on all parameters of the power module.

Windmill testing

Wind mills are quite complex devices requiring data acquisition of not only power parameters, but also mechanical (torque, RPM) and vibration. DEWESoft is the perfect tool for this application, since it can acquire and calculate all parameters in a single device. Whether you are up for power fault recording, power quality monitoring, mechanical measurements like RPM or vibration or networked data acquisition, DEWESoft is the perfect tool for the job.

Windmill and wind energy testing with DEWESoft.

Windmill and wind energy testing with DEWESoft.

Windmill and wind energy testing with DEWESoft.

Measurement hardware installed in windmill with DEWESoft running for data acquisition.

Windmill and wind energy testing with DEWESoft.

Application reports

Windmill testing	Windmill testing Vestas, USA	View
Application Vestas required a verstaile system not only able to measure power parameters. The system needs to be highly reliable and able to be controlled remotely. Measurement challenge The challenge is to measure all power parameters with any frequency, including variable frequency and also measure other parameters. Only Dewesoft can do everything. Additionally they required that the system can be remotely controlled from the headquarters which can be several thousands kilometers away. VESTAT windmill VESTAT windmill VESTAT windmill Measurement hardware Measurement hardware Data monitoring over large distance

Inspection and predictive maintenance

Inspection is a very important area of measurement in industry. Industries like nuclear power plants require strict inspections of critical parts of the plant. The industry is also more and more aware that predictive maintenance cuts the cost of production failures and reduces the downtime needed for maintenance, because the can service only the parts which needs to be serviced. Therefore the investment in measurement equipment makes sense.

Application reports

Relief valve pressure testing	Relief valve pressure testing Seabrook station NH, USA	View
Application Pressure valves are used in power plants to ensure that the steam pressure is under a limit of safe operation. In normal operation they have no functions - but if the pressure is increased, the relief valve opens. The customer has a special test bench made for testing. At every shutdown of the power plant the valves are inspected. Measurement challenge The challenge is to measure all necessary analog parameters (thermocouples, pressure sensors) from the bench as well as synchronized video picture. The system must be able to show the shutdown times and to show the synchronized video to SEE how the valve opens. Relief valve pressure testing Relief valve pressure testing Test setup Valve camera view Test room DEWESoft in action

Harmonic monitoring

A very nice application of power module in DEWESoft is to measure harmonics on the grids. DEWESoft offers a technology for software calculation of frequency and polyphase resampling of data to that line frequency, which results in perfect calculation of harmonic components. This technology is used for example in monitoring high voltage AC/DC power lines to transport energy on long distances.

Harmonic monitoring and analysis with DEWESoft.

Harmonic monitoring and analysis with DEWESoft.

Harmonic monitoring and analysis with DEWESoft.

Application reports

Harmonic monitoring	Siemens high voltage DC lines China	View
Application High voltage DC lines are used to transport energy over long distance or through the sea. The voltage levels are up to 1 MV with 3000 Amps which results in 3 GVA of energy over a single line. Since the voltage is transformed from alternating to direct and back, the result can be harmonics on the grid. To prevent this, they are using filter banks to filter higher harmonics. Measurement challenge The measurement system measures harmonics on the line, checking the correct operation of the filter banks. Several systems are distributed on both sides of the power line and they are connected together to act like a single instrument. The data can be monitored remotely online and the history can be reviewed from the database. DC lines DC lines Measurement hardware DEWESoft in action Measurement hardware

Order tracking

When determining how the structures behave under real operating conditions, order tracking provides the means of seeing the structural response to real life excitation. The rotating parts of the vehicle like engine, shafts or the wheels creates excitation forces on the structure. Did you ever had a car starting to rattle and shake at certain vehicle speed? This car was for sure not tested with DEWESoft and those high vibrations were result resonance frequencies of some elements at certain input frequencies.

By measuring rotating speed and the response (in terms of vibration, noise and others) the Nyquist, Bode and three dimensional FFTs are generated on the fly giving clear picture of the frequencies having a problem.

RPM sensor, encoder and pickup for order tracking processing and setup.

Order tracking setup screen inside DEWESoft 7.

Order tracking data acquisition screen inside DEWESoft 7.

DEWESoft 7 includes 2D and 3D graphs for displaying order and frequency data.

Application reports

Steam turbine dynamic behavior	Steam turbine dynamic behavior TET, Slovenia	View
Application The customers asked for a system to monitor dynamic behavior of the rotor of 125 MW steam turbine. They have mounted non contact displacement sensors and they needed a system to monitor 24/7 the possible faults and the behavior of the turbine. Measurement challenge A full dynamic measurement on 24 channels requires high sampling rates and smart triggering setup to reduce the amount of data while still giving a good idea what is going on. The order tracking math extract the harmonics and phase angles, giving a chance to display waterfall FFTs of runups in time and order domain, orbit plots, Bode and Nyquist diagrams. During runups/coastdowns or in case of faults the system stores the data with high speed, otherwise it only stores the reduced data. The data is stored in daily files and transferred to data server for analysis. Online data can be previewed with using DEWESoft NET. Steam turbine Steam turbine Steam turbine Steam turbine

Power quality

Another basic function of DEWESoft is the calculation of power quality parameters. Flicker, harmonic components, period values and other parameters are calculated along with other power parameters.

Power module in DEWESoft.

Power module in DEWESoft.

Power module data file from the normal light bulbs power testing.

Power module data file screen from the energy saving light bulbs power testing.

Another power module data file from the electric driller power test.

Power grid analysis

A full blown analysis of power grids is a basic function of Dewesoft. With the advanced triggering functions the system is able to capture transients, but also calculate all the parameters of power, harmonics, unbalance, harmonic distorions, symmetrical components and others.

A very nice option which cuts the system cost is to have more than one power module per acquisition device. We are running systems with twelve three phase power modules in a single box. Several systems can be networked together to act like a single device. Please look at Distributed data acquisition tab for more details.

3 phase power system configuration in power module in DEWESoft 7.

Power grid analysis with DEWESoft power module.

Power grid analysis with DEWESoft power module.

Power network monitoring

Power applications uses DEWESoft distributed data acquisition to the great extend to synchronize storing of data from different locations. Any number of standalone devices can send the data over the network to the central database providing power and transient data for further analysis. A special PMT software tool can analyze the database data and create reports according to EN 50160 standard as well as other customized reports.

Power network monitoring with DEWESoft power module.

Power network monitoring with DEWESoft power module.

Power network monitoring with DEWESoft power module.

Power network monitoring with DEWESoft power module.

Transient recording

Dewesoft offers very nice fault recorder features. A single data acquisition card can acquire data with a sample rate of 1 Ms/second. Beside that DEWESoft calculates power module channels, which can be used for triggering of data. The fault records are stored with full speed with pre and post time. For the time in between the data is stored at reduced speed, so it is very efficient.

Application reports