Abstract: In a power distribution system, power line insulators have three electrodes, two of which are connected to the line and to ground, and the third of which forms a capacitively stepped down voltage corresponding to the line voltage, and use sensing coils to measure current. The sensing coils are inversely connected and differentially located to suppress noise.

Abstract: An improved protective cover adapted to be suspended on an energized electrical conductor or insulator to protect workmen in the vicinity of the conductor. In one embodiment, the cover is an elongated tubular-shaped member formed by concentrically arranged inner and outer housings maintained in a spaced relationship by a plurality of spacers which provide and maintain an insulating air gap therebetween. A central sleeve is concentrically mounted within the inner housing and together with portions of the inner and outer housings forms a spiral passageway for suspending the cover on a conductor by engagement of the conductor with an inner concave surface of the central sleeve. The inner concave surface of the central sleeve is covered with a conductive material which reduces the strength of the electrical field stress surrounding the energized conductor.

Abstract: A device for cleaning of gases of electrically conductive particles, like soot and the like, in particular for cleaning of exhaust gases of fossil fuels, like exhaust gases of Diesel motors and the like, with a coagulator admitted by the gases is suggested, whereby for preventing the formation of a short circuit bridge between electrode and housing of coagulator caused by deposition of agglomerates the insulator which provides for an insulated conduct of electrode through housing is provided with a ring segment at the location where the electrode exits into the inside of the housing extending in axial direction from the insulator, whereby at least one preferable ring like annealing zone is provided thereon. Due to the prevailing temperature of about 450.degree. C. at annealing zone all depositing agglomerates are burned off.

Abstract: Hermetically sealed fiber optic cables (LW) are conducted through an insulator column consisting of several hollow insulators. The fiber optic cables (LW) are fastened to a support element (TE), whose one end is connected to the reference potential and whose other end is connected to a high voltage. The support element (TE) is characterized by a surface having only limited electrical conductivity. This assures that, as a result of the even field strength distribution thus guaranteed, no impermissibly high voltages are impressed on the fiber optic cable (LW). A non-conductive tube (GV) for conveying gas is wound around the support element (TE).

Abstract: An elongated, insulative tube of high mechanical strength is equipped with fittings at each end for electrical connection with a high voltage transmission line and a grounded tower. An external spark gap is provided between a first arcing ring mounted in electrical connection with one end fitting and a second arcing ring mounted to the tube intermediate its ends and electrically connected with a contact member disposed within the tube. The portion of the tube interior between the contact member and the other end fitting is packed with a series array of varistor discs. The tube maintains the line in spaced relation with the tower, while the varistor array and spark gap absorb voltage surge differentials between the line and tower.

Abstract: In an overhead electric transmission system in which the phase conductors incorporate optical fibres, a joint between optical fibres of two phase conductors or between optical fibres of a phase conductor and an optical cable extending to a sub-station is enclosed within a fluid-tight metal housing. The housing is electrically connected to each phase conductor, is electrically insulated from earth, and has an external shape of such a form as to provide effective control of electrical stress. Preferably the metal housing is of hemi-spherical shape and is mounted on top of a porcelain insulator containing oil under pressure. Where an optical fibre connected at the joint is that of an optical cable, it passes into the metal housing through the oil filled porcelain insulator.

Abstract: An arrangement for preventing the formation of a layer of foreign material on a high-voltage insulator. In situations where wind and rain are not available to clean a high-voltage insulator and thereby prevent arcing, this invention provides blowers which move a stream of air around the insulator. The blowers may be provided with motors which are supplied electrical energy from local low-voltage networks, or from a plurality of solar cells which are disposed on grounded parts of the support structure of the power line network. In some embodiments, the blowers may be of a motorless type and mounted directly on a high-voltage carrying conductor. In such a motorless blower arrangement, the blower blade is configured so as to have points which generate and repel ions in accordance with the known point-effect principle.

Abstract: A lightning arrester comprises a non-linear resistor as a lightning arrester element and an insulator holding the non-linear resistor in one body without a gap to prevent deterioration of the non-linear resistor caused by moisture.

Abstract: A two piece, open-ended, telescopically interfitted, synthetic resin insulative protective cover for one or more pin-type or post-type, conductor-supporting insulators is provided which has a configuration for substantially enveloping such insulators to thereby minimize the risk of inadvertent contact with the energized conductor, while also being easily installable using conventional hot-line tools by a lineman remote from the conductor and associated equipment. The cover preferably includes two separate sections which are individually installed and axially telescoped together over the insulator to give the complete cover. Each section has walls defining an elongated, insulator-receiving space and a longitudinal slot between the opposed bottom wall portions thereof.

Abstract: The invention provides a relatively simple and inexpensive means of alerting electric power line maintenance crews and uninformed citizenry as to whether or not electric power lines, whether overhead or damaged and on the ground, are energized. This is done by combining with the conventional insulator which is used to support a power line conductor a glow lamp or fluorescent indicator which lights up when the conductor is energized.

Abstract: A method of continuously monitoring the condition of a power transmission line insulator while it is in service, in which part of the insulator is bypassed by conductive means and in which, when the leakage current passed by the insulator and flowing through the conductive means exceeds a predetermined value, the conductive means is severed by a detonator or other explosive charge and actuating means is actuated which is operative to give a remote indication. Also a sensing and actuating device for use in the method, having conductive means and being adapted to be attached to an insulator so as to bypass part of it, which includes a detonator or other explosive charge adapted to sever the conductive means when leakage current through it exceeds a predetermined value and actuating means in the form of a mercury switch which is operable to give a remote indication when this happens.

Abstract: The present invention is an electrical terminal unit adapted for supporting an electrical circuit element, for example, a moisture responsive resistor or the like and a sensing device employing this terminal unit. The terminal unit makes the influence of the reduction in insulation resistance between the terminals due to adhesion of pollutants to the terminal unit negligible by providing a grounded electrically conductive member or electrode member between the conductive terminal leads extending through a base or substrate of the terminal unit for electrically separating these terminal leads.

Abstract: A guard for a high voltage terminal bushing includes a generally circular planar isolating member of an electrically insulating material which is mounted on the upper surface of the bushing and provided with a plurality of openings through which wind and rain may freely pass. A radial diameter of the isolating member is sufficient to prevent small animals from contacting a high voltage cable connected to the bushing and ground potential. A cylindrical section extends downwardly from the isolating member to support the guard on the upper surface of the bushing. A second cylindrical member extends downwardly and surrounds the upper portion of the bushing to form a cap to protect and shield the terminal end of the bushing. A lightning arrestor may be included which extends from adjacent the high voltage terminal to a point adjacent a transformer housing or ground potential.