The present invention provides a separator comprising a vessel (1) and an electrode assembly (2), wherein the vessel (1) has an inlet section (3), a main settling section (14) and an outlet section (4) and comprises a fluid inlet (5) arranged in the inlet section (3), and an oil outlet (7) and a water outlet (8) arranged in the outlet section (4); the electrode assembly (2) is arranged in the inlet section and comprises at least one fluid pipe (9) and at least one rod-shaped electrode (10), the fluid pipe surrounds at least parts of the rod-shaped electrode and comprises a pipe inlet (11) arranged in the inlet section and a pipe outlet (12) arranged in fluid communication with the main settling section, wherein a liquid obstruction element (13) is arranged downstream the fluid inlet, such that at least a major part of a liquid component of a fluid stream entering the inlet section via the fluid inlet, during use, may be forced to pass through the at least one fluid pipe via the pipe inlet before entering the main settling section.