Abstract: An overhead power line insulator comprises a dielectric element (4) having an outside surface forming a skirt (5) with a head extended by a metal attachment fitting (7) for attaching the insulator, and a device for detecting surface leakage current flowing on the dielectric (4), the device comprising a conductive ring (8) that surrounds the fitting (7) and that is in contact with the outside surface of the dielectric (4). An electrically insulating protective element (10) is provided in the form of a collared bushing that surrounds the fitting (7), being interposed between the ring (8) and the fitting (7) and extending radially so as to overlie the ring (8) in order to protect it from environmental pollution.

Abstract: A composite insulator (1) for overhead power lines comprises a rigid core extending axially between two attachment fittings (6) and having placed thereon a shell having sheds (5, 5?) made of electrically insulating synthetic material. It includes a detector device for detecting surface leakage currents, which device includes an electrically conductive metal annular ring (7) surrounding the shell between an end shed (5?) adjacent to one of the two fittings (6) and another shed (5) adjacent to the end shed (5?) that extends radially over the ring (7). The ring (7) is connected by a conductive wire (8) passing through the end shed (5?) to be connected to an electronic unit (9) of the detector device.

Abstract: A composite insulator (1) for overhead power lines comprises a rigid core extending axially between two attachment fittings (6) and having placed thereon a shell having sheds (5, 5?) made of electrically insulating synthetic material. It includes a detector device for detecting surface leakage currents, which device includes an electrically conductive metal annular ring (7) surrounding the shell between an end shed (5?) adjacent to one of the two fittings (6) and another shed (5) adjacent to the end shed (5?) that extends radially over the ring (7). The ring (7) is connected by a conductive wire (8) passing through the end shed (5?) to be connected to an electronic unit (9) of the detector device.

Abstract: An overhead power line insulator comprises a dielectric element (4) having an outside surface forming a skirt (5) with a head extended by a metal attachment fitting (7) for attaching the insulator, and a device for detecting surface leakage current flowing on the dielectric (4), the device comprising a conductive ring (8) that surrounds the fitting (7) and that is in contact with the outside surface of the dielectric (4). An electrically insulating protective element (10) is provided in the form of a collared bushing that surrounds the fitting (7), being interposed between the ring (8) and the fitting (7) and extending radially so as to overlie the ring (8) in order to protect it from environmental pollution.