Electric Power and Cooling Systems for PETRA

For 19 GeV operation the PETRA storage ring and its experiments need 25 MW of electric power. The different power distribution systems at medium voltage and low voltage level are described. For powering the PETRA magnet system individual high precision dc-power supplies are employed, all centrally located near the PETRA control room. Details will be given about the magnet circuits and the rf-power supplies. Water cooling of the PETRA magnets, vacuum chambers and rf-components is made by 2 systems consisting of pumps, heat exchangers etc and concentrated in 2 cooling centers together with a cooling tower and a cooling spray pond. Cooling equipment for individual experiments is located near the experiments. Utilization of part of the electric energy for heating is provided.