Abstract: An insulating cap for a loadbreak bushing includes an outer conductive jacket preferably having a ground wire receiving member thereon. The ground wire receiving member may be in the form of an integral tab having a bore therethrough for connection of the ground wire. The insulating cap further includes an insulation member positioned in adjacent relationship to the inner surface of the conductive jacket. In a preferred embodiment, both the inner surface of the conductive jacket and the inner exterior surface of the insulation member includes a smooth, dome-shaped region which helps to control electrical stresses, if any. The inner surface of the insulation member defines a bushing receiving space which substantially corresponds to the exterior shape of a loadbreak bushing. When properly grounded, the outer conductive jacket of the insulating cap is maintained at ground potential.

Abstract: A device for containing an electrical discharge arc and holding the arc substantially captive until it is extinguished. The device comprises two spaced apart conductor systems (13 and 14) that are connected to points (23 and 24) of different voltage potential in an electrical circuit, so that arc current will flow through and between the conductor systems (13 and 14) in the event of an arc discharge between the conductor systems. The conductor systems are arranged normally to locate about an insulated portion (22) of an electrical apparatus.

Abstract: The present invention provides an insulating spacer for a high-voltage conductor constructed with a plastic made of an epoxy resin composition so that the volumetric specific resistance of the shield electrode increases toward the median point between a container and the conductor and a method for manufacturing shield electrode used therein. The insulating spacer according to the present invention can lessen the concentration of electric fields in the boundary areas between the shield electrode and the insulating member with the result that reliability is improved and service life is lengthened.

Abstract: An electrostatically charged animal barrier for the protection of electrical bushings and other types of electrical equipment which utilizes a plurality of radially extending spokes fabricated from conducting material. These spokes may be secured within the bushing material itself, or may be carried by an annular support of non-conducting material which is removably secured about the longitudinal axis of the bushing. The inner side of the annular support includes a number of small projections to space the support from the bushing so as to provide a passageway for condensation and rainfall. Current flow through the conductor within the bushing creates an electrostatic charge on the spokes sufficient to discourage an animal from attempting to climb around the barrier.

Abstract: A resin-rich electrically conductive felt material is described. The described conductive felt can be used to suppress corona discharge in high voltage generator coils. The conductive felt is prepared by treatment with electrically conducting polymers, such as polyaniline and polypyrrole, and resistivity values ranging from 4,000 to 100,000 ohms may be obtained. This treated felt can be readily impregnated with thermoset resins, such as epoxies, to provide flexible prepregs suitable for coil bonding applications in turbine generators.

Abstract: An improved apparatus for deconcentrating an electric field surrounding a high voltage insulator. A clamp assembly centrally formed within a coronal ring permits positive placement of the coronal ring about an insulator end fitting. The clamping assembly comprises an integral clamp with a u-shaped opening for engaging a cylindrical portion of an insulator end fitting. A keeper clamp mounts superjacent to the integral clamp and a smaller second u-shaped opening engages a portion of the insulator end fitting having a smaller diameter. A captive fastener such as a bolt extends upwardly through the clamp and keeper clamp to secure the keeper clamp in position against the insulator end fitting and the integral clamp to secure the corona ring in position relative the insulator end fitting and sheds. The varied sized openings of the clamp and keeper clamp prevent inverted installation of the corona ring.

Abstract: An electrical-stress-controlled solid dielectric cable termination assembly having an electrical stress control device which comprises a metal conductor suitably shaped to achieve an electrical stress control function. A durable material having a high dielectric strength is applied as a coating to the exposed surfaces of the conductor. The coating prevents conductive particles or contaminants which may be present in an insulating fluid medium from directly contacting the stress control device. Even if such particles are attracted to the device, the particles will float at the prevailing electrical potential in the region and will therefore not cause increased electrical stress. In first and second embodiments of the invention, stress control cones for a joint and a termination, respectively, are formed from modified-cylindrically-shaped metal conductors. In a third embodiment, a corona shield is formed from a modified-cylindrically-shaped metal conductor.

Abstract: The present invention provides a floating shield for a high voltage bushing. Preferably the bushing is conically shaped and has a composite housing for substantially optimizing the electrical performance of the bushing according to the invention. The floating shield is preferably suspended within the bushing housing by a supporting insulator placed in a low electrical stress region of the bushing. In a preferred embodiment, the supporting insulator is disposed between a ground grading shield and the bushing housing. The composite housing preferably provides a protective inner tube made of a fiber reinforced material and an outer silicone rubber housing having weather sheds formed in a helix on the surface of the housing.

Abstract: A generally-planar polymeric protective shield (2) for mounting on a high voltage porcelain insulator (16) has circumferential and radial intersecting grooves (8,10) in its upper surface. The intersections are deepened to provide point projections (12) from the lower surface thereby to space the major portion of the shield (2) from the insulator (16). The convoluted upper surface of the shield (2) enhances the physical protection of the porcelain of the insulator (16).

Abstract: A cable tensile strain reliever comprising a cable sheath which is attached its attachment to a body absorbing the tensile strain and a clamping part for constricting the cable and fixing it relative to the sheath, which not only provides adequate strain relief at high tensile loads but also ensures reliable protection against buckling and which is of simple construction and very stable.

Abstract: An insulator for use in a suspension-type line arrester that supports a transmission line is disclosed. Such line arresters have a plurality of insulators connected in a string. The insulators have linking members configured to prevent relative rotation between adjacent insulators in the line arrester's insulator string.

Abstract: A combined current and voltage measuring sensor for measuring voltage and current on a primary conductor, the sensor including a cast resin body having therein a aluminum support, the support having an aluminum encasement mounted thereto. An air core coil is encapsulate with the encasement within the cast resin body adjacent a grooved portion in the cast resin body for maintaining the primary conductor in the top of the cast resin body. The groove and the aluminum encasement cooperate to precisely locate the primary conductor with respect to the air core coil. A keeper assembly mechanically maintains and locates the primary conductor in the groove and further provides an electrical connection from the primary conductor to the voltage measuring apparatus of the sensor. A corona shield encapsulated within the cast resin body is at the same potential as the conductor and is interposed between the air coil and the groove of the cast resin body.

Abstract: An arresting insulator is provided which includes an insulator body made of an insulative material and a non-linear resistor. The insulator body includes a head for linking the insulator to an adjacent insulator, and a shed formed integrally with the head. The resistor is secured in the insulator body and has a non-linear relation between residual voltage and current. More specifically, the resistor has a characteristic that satisfies the equation:V.sub.NmA /H.gtoreq.300 V/mmwherein V.sub.NmA is a threshold reference voltage that causes a current of at least N milliamps to start flowing across the resistor to cause the resistor to perform a surge absorbing function. N is an arbitrary value in the range of 1 to 10, and H is the axial length of the resistor along a direction of electric field in millimeters.

Abstract: In a cathode ray tube socket which is provided with a socket body having a plurality of contacts disposed in a circle and a high voltage discharge gap housing provided on one side of the socket body, there are provided along the inside surface of both a case forming the high voltage discharge gap housing and a cover to be put on the case on the side of its open end face a plurality of plate-shaped ribs extending in a direction across a high voltage discharge in the high voltage discharge gap housing. The ribs of the case and the cover are disposed at predetermined intervals so that they do not overlap each other. A meandering ridge is formed along one of the opposed side walls of the case and cover to define a gap therebetween.

Abstract: A high voltage bushing for use in a plasma environment. The bushing is adapted for mounting through a wall of a pressure vessel or the like and includes an elongate insulator having a central bore receiving an electrical conductor. The insulator has a lower portion extending through an opening in the wall and an upper portion extending away from the wall. Mounting hardware is included for retaining the lower portion in the opening. A terminal is held adjacent the free end of the insulator upper portion with the terminal connected to the conductor. The bushing further includes a number of resistive rings positioned about the upper portion of the insulator and a number of annular metallic fins also positioned about the upper portion of the insulator. One of the fins is disposed between each pair of adjacent rings, and the fins extend outwardly beyond the rings.

Abstract: An insulator housing comprising a resin bonded fibre tube carrying water repellent, spirally arranged inner sheds and water sheds made from strips of polymeric material provides improved outdoor electrical insulation. The insulator housing provides greater insulation performance per unit length of housing than prior art structures.

Abstract: An electrical insulator (1) of the type comprising at least one dielectric (2) and an iron or steel cap (3) fixed axially on the dielectric has a device for protecting the cap against corrosion as well as electric arcs. In one embodiment (FIGS. 1-3), the protection device comprises a zinc or aluminum part (10) shaped as a dish with a center hole (11) and outlet holes (12) for the egress of rainwater. The outside wall (13) of the part (10) curves upwardly toward the cap (3) and a portion of the part (10) is disposed between the base (6) of the cap (3) and the outer surface (7) of the dielectric (2). In another embodiment (FIG. 4), the protection device comprises a solid body of revolution (30) of semi-toroidal shape which is formed of zinc or aluminum and is cast directly around the base (6) of the cap (3) and has a thin flange extending between the base (6 )of the cap (3) and the outer surface (7) of the dielectric (2).

Abstract: A high voltage arcing horn device for safely dissipating electrical arcs caused by power surges in high voltage power lines, the device being provided with a first rigid electrode electrically connected to one of a pair of electrically isolated conductor terminals of an insulator, and a second rigid electrode electrically connected to the other of the conductor terminals, the electrodes including proximal portions fixedly clamped to the terminals and extending in predetermined spaced relationship adjacent the insulator and having distal end portions disposed in predetermined, parallel, spaced relationship one to the other.

Abstract: The invention relates to an outdoor high voltage insulator, wherein the flashover due to the effect of external layers or deposits of pollution is prevented or at least shifted in the direction of higher degree of pollution. A resistance element (1) is connected in series with the insulator itself (2), with the leakage current prior to flashover producing a voltage drop over the resistance element (1). This voltage drop reduces the voltage on the insulator and prevents or retards flashover.

Abstract: In order to prevent sparking or corona effects in the high voltage carrying parts of the outdoor high voltage circuit breaker, shielding electrodes are provided. The shielding electrodes are angular frames. The frames are formed of hollow cylindrical straight rods and of substantially spherical corner pieces which connect the rods with each other. With this design, there are minimum costs of the component parts for shielding electrodes of varying size and shape.

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: Erosion- and decomposition-caused deterioration of exterior regions of an arc-extinguishing housing included in a high-voltage switch is eliminated or reduced. The switch also includes a stationary contact within a sealed chamber defined by the housing and a switch blade movable into and out of engagement with the stationary contact through a slit communicating with the chamber. The stationary contact and the switch blade are connectable to opposite sides of a high-voltage source. The deterioration-prone region of the housing resides between one housing portion which is connected to and is at the voltage of the stationary contact, and another portion which is essentially electrically floating. Deterioration is eliminated or reduced by closely capacitively coupling current to the region from a conductive projection connected to the stationary contact. The projection is closely spaced from, and may be either above or below, the region.

Abstract: A three phase gas pipe cable is disclosed which has at least one gas pipe cable section in which three phase conductors are arranged in a triangular configuration within an enclosing pipe. Each phase conductor is supported by at least one supporting insulator such that the longitudinal axis of each phase conductor is substantially parallel to the longitudinal axis of the enclosing pipe. The supporting insulator is connected by a slide bearing member to the enclosing pipe. The slide bearing member accommodates an insulator foot end of the supporting insulator in such a manner that the supporting insulator is capable of motion in the direction of the longitudinal axis of the enclosing pipe.

Abstract: A conductor support member includes an external surface having a first portion thereon. The first portion is shaped to generate a localized increase in voltage gradient. Shielding means including surfaces intersecting to define a sharp edge are provided to promote a negative corona discharge adjacent the first portion. The said negative corona discharge produces a positive space charge to reduce the voltage gradient at the first portion. This inhibits the generation of positive corona discharge.

Abstract: An electrical insulation body formed of a polymer binder highly filled with electrically non-conductive inorganic inert filler particles, including in excess of 85% of such particles. Such high loading is facilitated by grading the particles in nonhomogeneous sizes including relatively large ones and by use of polymer binders of relatively low viscosity.

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.

Abstract: An improved linear or rod insulator for electrically insulating a first electrical potential from a second electrical potential. The improved linear insulator comprising a nonconductive cylindrical linear core member having a conductive first mounting means secured to a first end of the core member and a conductive second mounting means secured to the second end of the core member. The first and second mounting means being attached to a first and a second electrical potential, respectively. The improved linear insulator further comprising a plurality of nonconducting disc shaped toroidal sheds coaxially secured to said core member, and a plurality of conducting bowl shaped toroidal shields coaxially secured to said core member and positioned alternatingly with said sheds so that each of said sheds is located intermediate two of said shields.

Abstract: A surface of a wooden object is decorated by the formation of tracks in the surface simulating the random pattern of tracks seen in wormy wood, the tracks being formed by the application to the wood of a high voltage current.

Abstract: An electrical insulator composed of one or more electrical insulating skirts or sheds or shells; at least some of which skirts or sheds or shells have embedded therein or otherwise associated therewith a permanent magnet (usually annular in shape) that serves to create a magnetic field region through which an arc, in the event of incipient flashover, must pass as it proceeds radially from one terminal of the insulator to the other terminal thereof. The magnetic field is oriented to have a component at the surface of the insulator, that is orthogonal to said surface. As the arc passes through the field region it is deflected sideways or circumferentially and rotates in a circle, thereby dissipating the energy in the arc. The effect of the field can be increased by having two or more annularly shaped permanent magnets embedded in the insulator and spaced radially from one another, successive magnets having oppositely directed fields to the magnet or magnets immediately adjacent the same.

Abstract: An electrical insulator composed of one or more electrical insulating skirts or sheds or shells at least some of which skirts or sheds or shells have a plurality of discrete conductive regions at one surface thereof, the discrete conductive regions being appropriately arranged and sufficient in number to intercept an arc in the event of incipient flashover from proceeding radially past the discrete conductive regions, thereby to prevent said flashover.