Power Quality Analysis at Falu Hospital

Abstract: This is a master thesis performed on behalf of ABB Power Quality Center, aiming to investigate the power quality at Falu hospital. Hospitals can suffer from bad power quality both in the aspect of malfunctioning equipment, and as they can provide disturbances to the power grid. In hospitals it is essential that everything works properly, or the consequences can be fatal. The daily operations at a hospital contains a number of different electrical equipment, from ordinary computers to advanced machines for x-rays or chromatography. This type of equipment can cause disturbances in the power system and other equipment can be affected by this. Therefore, it is very important for hospitals to have good power quality. In order to investigate the power quality, a measurement study was performed at the hospital in Falun. The parameters considered in this study were supply voltage variations, voltage dips, voltage swells, rapid voltage changes, voltage unbalance, voltage harmonics and consumption of active and reactive power. To determine the quality of the power the Swedish statute EIFS 2013:1 was used as a reference for the voltage variations and the grid operator's guidelines for the power parameters. The data from the measurements were analyzed with PQSecure and Matlab. The reults showed that the hospital had no problems regarding the studied parameters of the power quality. They were approved in every case investigated in this study however there could still be improvements regarding the power factor.