Task

Harmonics, voltage fluctuations and transients are a current topic within these fast grids as well as within their slower siblings. However, the difference lies in the necessary bandwidth or sampling rate of the measurement instruments. If you want to analyse 50 harmonics you need a sampling rate of 40 kHz in 400 Hz grids and a sampling rate of even 80 kHz per channel in 800 Hz grids. Transients should even be recorded with 500 kHz or more.

• Harmonics measurement
• Power measurement
• Determination of power factor
• Voltage fluctuation
• Transients
• Efficiency factor

The identification of efficiency factors, especially at low workload and big phase angles, gives information on the overall efficiency. Especially nowadays when energy optimisation is in the focus of interest this is an absolutely important tool.

DEWETRON‘s solutions for this application are DEWE-PM instruments with the DEWE-ORION cards 1616-500 or 0816-1000 and DAQP-HV-S3 modules for measuring voltage and DAQP-LV modules for measuring current.

• ± 1400 Vpeak
• 4 kV electric strength
• 700 kHz bandwidth
• 1 MS/s sampling rate
• Typical accuracy of < 0.05 %
• Individual number of channels
• Several power modules in one instrument
• Synchronous analysis of harmonics and frequency
• Mathematical library (e.g. calculation of various efficiency factors)
• Electromagnetic influences
• Power curve and revolutions per minute / torque curve
• Electrical characteristics such as harmonics, fundamental power, reactive power, switching operation, run-up

Hardware

DEWETRON offers several instruments that are suitable for measurements on 400 Hz (800 Hz) machines. The basis is always a basic instrument with a rack for DAQP module. Special focus was put on the stability and capacity of the instruments independently from the fact that a 19’’ instrument for a fixed installation or a portable instrument is used.

Software

The identification of transients, the calculation of power and the measurement of harmonics are only a few of the numerous functions of the measurement software DEWESoft with its option POWER. Unbalances, flicker, frequency and revolution per minute are some more that are nowadays necessary for the power analysis. Besides, it is very important to reach high sampling rates that can be processed by the software: 500 kHz for the calculation of power are a must-have for controlled drive systems.