Abstract:
The invention relates to an electrical switching device with a switching chamber (10), which comprises at least two arcing contacts (192, 192) movable in relation to each other and defining an arcing region (22) in which an arc (20) is formed during a current breaking operation, with the switching chamber (10) being filled with a switching medium (20) for arc quenching and for dielectrical insulation. The switching chamber (10) further comprises an exhaust volume (40, 62) fluidically connected to the arcing region (22) to allow the switching medium heated by the arc (20) to flow out of the arcing region (22) to the exhaust volume (40, 62), thereby transferring heat to a surface area of a metal component of the switching chamber (10). The device is characterized in that at least a portion of a surface contained in the switching chamber (10) is covered with a porous layer (72).
Abstract:
An electric switching device (1) filled with a dielectric insulating medium comprises an arrangement of arcing contacts with a first arcing contact (3) and a second arcing contact (4), an insulating nozzle (2), an arcing volume (5) between the first arcing contact (3) and the second arcing contact (4), an exhaust volume (6) and an exhaust tube (7) arranged inside the exhaust volume (6). A diameter of the exhaust tube (7) increases in longitudinal direction (z) away from the arcing volume (5). Additionally or alternatively, the exhaust tube (7) comprises a plurality of exhaust tube openings (8) through its side wall (12), which connect the interior of the exhaust tube (7) with the exhaust volume (6), wherein at least a part of the exhaust tube openings (8) have different sizes.
Abstract:
The invention relates to an electrical switching device with a switching chamber (10), which comprises at least two arcing contacts (192, 192) movable in relation to each other and defining an arcing region (22) in which an arc (20) is formed during a current breaking operation, with the switching chamber (10) being filled with a switching medium (20) for arc quenching and for dielectrical insulation. The switching chamber (10) further comprises an exhaust volume (40, 62) fluidically connected to the arcing region (22) to allow the switching medium heated by the arc (20) to flow out of the arcing region (22) to the exhaust volume (40, 62), thereby transferring heat to a surface area of a metal component of the switching chamber (10). The device is characterized in that at least a portion of a surface contained in the switching chamber (10) is covered with a porous layer (72).
Abstract:
The present invention relates to an electrical apparatus having an insulating space which contains a dielectric insulation fluid comprising an organofluorine compound. At least one solid component of the apparatus that is directly exposed to the insulation fluid contains a basic body made of a first material and a protective layer made of a second material different from the first material, the protective layer being directly or indirectly applied on the basic body and having a thickness of at least 50 μm. The organofluorine compound is selected from the group consisting of: fluoroethers, fluoroketones, fluoroolefins, fluoronitriles, and mixtures thereof, and the first material comprises or consists of a material selected from the group consisting of: a polymeric material, a ceramic, a composite material, and mixtures or combinations thereof.
Abstract:
An apparatus (1) for heating an insulation fluid (10) in a medium-voltage or high-voltage switchgear (100) comprises an infrared source (3) which is adapted to emit infrared radiation (4) of at least one wavelength. Thus, at least one vibrational or rotational mode of at least one component (11) of the insulation fluid (10) is excited by absorption of at least a part of the infrared radiation (4), and condensation of the insulation fluid (10) is efficiently prevented by this direct heating of the insulation fluid (10). A closed loop temperature regulator (5) is used to heat only when required. A circulator (7) in a heating chamber (8) further provides for a mixing of the insulation fluid (10), thus preventing steep temperature gradients.