One year high rate low voltage recording - Devices, methods and results

Power system management currently advances from rigid to flexible and requires highly sophisticated monitoring and control in the future. In order to contribute to a more detailed analysis and to provide a fundamental database for simulation and investigation we developed the recording device EDR (Electrical Data Recorder). Synchronized continuous high rate captures of low voltage time series are stored in a central database without any data reduction. Since more than one year we already record voltage transient information from the KIT campus power supply. We checked the device for accuracy, for reliability and developed methods for large scale data storage and for use with simulation. In this paper we present these devices and methods, as well the improvements, derived from the experiences we gathered in our studies. We conclude that the EDR provides high accuracy and precision; our data storage and retrieval methods are fast and appropriate; but available simulation tools need improvements. The system is now ready for productive use in the low voltage supply grid.