AUSTRIA Abshrcl: llis paper deals with the electrical strength properties of oil gaps. The investigations were d e d out with nnifom eledriesl fields and electrode distances up to .30 mm. Measnrements were performed with alternating ament (50 Hz), lightning impnlxa and switching impulses Such investigations have Usunlly relative high dispersion of the measnrement valnes.In an attempt it will be shown that it is possible to minimize the cneffiaent of variation to values about 5 to 6 perrent.