Classification and correlation of monitored power quality events

Summary form only given. The presentation provides an overview of the existing standards for characterising the quality of electric service to high-tech facilities. The measurement requirements and characteristics of power quality measurements to fully analyse and classify the various PQ events are discussed. The specifications of state-of-the-art PQ monitoring instrumentation are discussed. The requirements of the hardware, the firmware and the software are discussed. These specifications cover the actual data capture, the communication of the instruments to central servers, and the analysis and GUI software requirements. The presentation also includes analysis of events captured at a high-tech facility in the Bay Area of San Francisco, USA. Of special interest is the major event due to a short circuit at one of the substations in the utility's system. The effect of the resulting voltage sag are presented, showing the effect on various systems. This event, and other minor PQ events recorded at the high tech facility are correlated with some of the commonly used PQ standards, and the results are presented.