Arrester with spark gap

In an arrester for limiting overvoltages in a low voltage power system and for coupling conductors which are normally resistively separated from one another for lightning protection, which arrester includes at least two electrodes spaced apart to define at least one spark gap forming an arc discharge region, and insulating means holding the electrodes in spaced-apart relation, the improvement comprising means defining a first chamber adjacent the arc discharge region and providing a chamber wall of an insulating material which emits a quenching gas under the effect of heat and provided with at least one outlet aperture through which the gases emitted under the effect of the heat generated during arc discharge can escape, and wherein said insulating means comprises a body interposed between said electrodes and located adjacent the arc discharge region, said body being of a material which emits a quenching gas under the effect of heat generated by an arc discharge, each of said electrodes and said body has the form of a disc, each of said discs has the form of a circular cylinder, and all of said discs have the same diameter.

In an arrester for limiting overvoltages in a low voltage power system and for coupling conductors which are normally resistively separated from one another for lightning protection, which arrester includes at least two electrodes spaced apart to define at least one spark gap forming an arc discharge region, and insulating means holding the electrodes in spaced-apart relation, the improvement comprising means defining a first chamber adjacent the arc discharge region and providing a chamber wall of an insulating material which emits a quenching gas under the effect of heat and provided with at least one outlet aperture through which the gases emitted under the effect of the heat generated during arc discharge can escape, and wherein said insulating means comprises a body interposed between said electrodes and located adjacent the arc discharge region, said body being of a material which emits a quenching gas under the effect of heat generated by an arc discharge, and one of said electrodes has the form of a solid cylinder while the other of said electrodes and said body have the form of hollow cylinders.

In an arrester for limiting overvoltages in a low voltage power system and for coupling conductors which are normally resistively separated from one another for lightning protection, which arrester includes at least two electrodes spaced apart to define at least one spark gap forming an arc discharge region, and insulating means holding the electrodes in spaced-apart relation, the improvement comprising means defining a first chamber adjacent the arc discharge region and providing a chamber wall of an insulating material which emits a quenching gas under the effect of heat and provided with at least one outlet aperture through which the gases emitted under the effect of the heat generated during arc discharge can escape, and wherein said wall of said first chamber has the form of a cylinder provided with a plurality of said apertures in the form of openings in at least one of the cylindrical surface and an end surface of said cylinder.

In an arrester for limiting overvoltages in a low voltage power system and for coupling conductors which are normally resistively separated from one another for lightning protection, which arrester includes at least two electrodes spaced apart to define at least one spark gap forming an arc discharge region, and insulating means holding the electrodes in spaced-apart relation, the improvement comprising means defining a first chamber adjacent the arc discharge region and providing a chamber wall of an insulating material which emits a quenching gas under the effect of heat and provided with at least one outlet aperture through which the gases emitted under the effect of the heat generated during arc discharge can escape, and wherein there are at least three said electrodes arranged in sequence to define two series-arranged spark gaps, and said insulating means comprise a mica spacer located in one of said spark gaps between said electrodes defining said one spark gap.

In an arrester for limiting overvoltages in a low voltage power system and for coupling conductors which are normally resistively separated from one another for lightning protection, which arrester includes at least two electrodes spaced apart to define at least one spark gap forming an arc discharge region, and insulating means holding the electrodes in spaced-apart relation, the improvement comprising means defining a first chamber adjacent the arc discharge region and providing a chamber wall of an insulating material which emits a quenching gas under the effect of heat and provided with at least one outlet aperture through which the gases emitted under the effect of the heat generated during arc discharge can escape, and wherein there are at least three said electrodes arranged in sequence to define two series-arranged spark gaps, and each said electrode has a cylindrical form and the outermost electrodes of said sequence have an outer diameter which changes abruptly at a selected point in their axial direction.