INDUCTOR FOR HEATING HEAVY OIL AND OIL SAND DEPOSITS

The invention relates to a plug element (10), in particular for producing capacitors (C), which comprises three sections (1, 2, 3) in the direction of its longitudinal extent, wherein a first section (1) has a tapered shape at one end of the plug element (10), said tapered shape complementing a shape of a third section (3) at that end of the plug element (10) which is averted from the first section (1), and wherein a second section (2) is arranged between the first and the third section (1, 3), said second section connecting the first and the third section (1, 3) to one another. The invention also relates to a plug system (100) comprising plug elements (10) by means of which (cylindrical) capacitors (C) can be created, wherein electrically conductive layers (L1, D, L2, U) of the capacitor (C) which is formed from the plug system (100) simultaneously form a conduction structure of an inductor.