Abstract: The present disclosure describes an electric fuse, comprising a melting member contained within an insulated cylindrical casing, which is sealed at each end by an electrically conductive cover electrically connected to said melting member. On each end of the fuse casing, between said casing and said cover, is installed an electrically conductive and plastically deformable separating barrier. On the side of separating barrier facing the interior of the casing is affixed a layer of an elastic and electrically insulating material. The melting member is on each end portion of said fuse electrically connected with each cover via said separating barrier and proceeds through said electrically insulating layer. Within said layer the melting member has at least one bend, by which it is anchored therein and secured against being pulled out.

Abstract: Current transformer (CT) retainers (100, 200, 300, 400) are disclosed for use in an electrical enclosure (510) for an electrical panel (500). An exemplary CT retainer includes a body that has one end portion (110, 210, 410) configured to mount onto a wall (140) of the electrical enclosure. The body of the CT retainer also includes an opposite end portion with a basket (150, 250, 350, 450) for housing a CT. The basket includes a flexible clip (160 and 180, 260 and 280, 360 and 380, or 470) which is configured to flex to allow insertion of the CT into the basket or removal of the CT from the basket.

Abstract: An improved fuse including a fuse body formed of an electrically insulative material. The fuse body defines a cavity which extends from a first end of the fuse body to a second end of the fuse body. A fusible element is disposed within the cavity and extends from a first end face of the first end of the fuse body to a second end face of the second end of the fuse body. Insulated plugs are disposed within the cavity at the first and second ends of the fuse body wherein the plugs adhere to an interior surface of the fuse body and form seals that close the internal cavity. The fuse may further include end terminations that are applied to the ends of the fuse body in electrical contact with the fusible element.

Abstract: An electrical bushing is disclosed for use in high voltage cryogenic applications. The bushing including first and second bushing portions and an electrical conductor disposed longitudinally within the portions. The electrical conductor has a first terminal extending from the first bushing portion and a second terminal extending from the second bushing portion. The first terminal is configured to couple to a first electrical element at ambient temperature, and the second terminal is configured to couple to a second electrical element at cryogenic temperature. The first and second bushing portions comprise a base insulator material, while the first bushing portion further comprises an environmental protection layer disposed over the base insulator portion.

Abstract: An improved fuse including a fuse body, a fusible element, end terminations and insulated plugs used to seal a cavity formed within the fuse body to extinguish electrical arcs when an overcurrent condition occurs.

Abstract: A cutout cover includes an arcuate top portion covering an insulator having a closed top and an open bottom with a slit extending therebetween. A midsection can connect the top portion to an open end adapted to access the cutout. The top portion is bell-shaped with an upper and lower dome, two opposing sides, and a slit between the sides. A fastener mechanism is attached to the two opposing sides with an aperture disposed on each of the sides for receiving a fastener.

Abstract: A fuse mounting assembly includes an epoxy-bonded glass-fiber core that is surrounded by a resilient sleeve having a number of radially extending members. Attached to an end of the core is a first mounting bracket and attached to another end of the core is another mounting bracket. Each of the mounting brackets is connected to a fuse which is structured to protect a power circuit.

Abstract: An insulator for a cutout switch and fuse assembly used in connection with an electrical power grid, including a body including a first end and a second end, a guide connector, a conductor strip, and a tool structure is located, a pivot connector is located at the second end of the body, and a mounting connector is located on the body between the first end and the second end. In an alternative embodiment, universal connectors are located at the first end and the second end. The body is manufactured by a filament winding process.

Abstract: A fuse mounting assembly includes an epoxy-bonded glass-fiber core that is surrounded by a resilient sleeve having a number of radially extending members. Attached to an end of the core is a first mounting bracket and attached to another end of the core is another mounting bracket. Each of the mounting brackets is connected to a fuse which is structured to protect a power circuit.

Abstract: The present invention relates to an electrical fuse cutout comprising: (i) an insulator having a composite body and at least two connectors, wherein a first connector couples the composite body to a fuse assembly and a second connector couples the body to a utility structure; (ii) a housing containing the composite body; and (iii) a fuse assembly.

Abstract: The present invention relates to an electrical fuse cutout comprising: (i) an insulator having a composite body and at least two connectors, wherein a first connector couples the composite body to a fuse assembly and a second connector couples the body to a utility structure; (ii) a housing containing the composite body; and (iii) a fuse assembly.

Abstract: A new elbow canister fuseholder is provided that includes an electrically insulated and shielded housing for placing a fuse in-line between a cable and an electrical apparatus for underground distribution application. An insulating tube is contained within the housing for easy sliding removal of the fuse through an end plug such that the elbow is reusable when a fuse is replaced.

Abstract: Methods and apparatus for fusing high-voltage electrical systems including fuse holding dry wells each of which includes a metallic outer wall, a fuse mount and a chimney tube located between the outer wall and a fuse in the mount. The dry wells may be mounted completely within an associated switchgear tank, partially within and partially without the associated tank, on the outer surface of the tank, or on structural means other than a switchgear tank.

Abstract: An improved, integrally cast, synthetic resin insulator (22) especially adapted for use in an electrical cutout device (20) is provided which can be readily fabricated and gives greatly enhanced beam strength and arc track resistance characteristics. The preferred insulator (22) is cast using an epoxy resin such as bisphenol A filled with a relatively large quantity of glass beads and hydrated alumina. The filler fraction contributes to lowered viscosity, deaerability and improved settling properties while the resin is in an uncured state, and moreover enhances the arc track resistance and mechanical strength of the resin system after curing. The preferred insulator (22) is cast to present a longitudinal bow giving the insulator (22) an arcuate central axis. Further, the periphery of the insulator (22) is formed with a series of superposed, generally oval-shaped in cross-section, outwardly flaring skirts (30) interconnected by smooth transition regions (32) free of stress-inducing sharp corners.

Abstract: A current limiting fuse for a transformer bushing including a glass tubing, an elongate ribbon spirally wound in the tubing, the ribbon including a number of tabs formed integral therewith to space the ribbon inwardly of the walls of the tubing, a terminal stud mounted on one end of the tubing and being electrically connected to the ribbon, a conductive rod connected to the other end of the ribbon and sealed in the other end of the tubing, a granular dielectric material completely filling the tubing, a self-sealing, self-bonding, rubber tape wrapped around the outside of the tubing and a glass reinforced tape wrapped around the outside of the rubber tape.

Abstract: A vacuum fuse is mounted in an insulating oil filled tank containing electrical apparatus and is directly immersed in the insulating oil. A fuse ferrule contact block is suspended in the insulating oil. The suspension for the contact block permits insulating oil to contact the contact block over its entire surface. An opening in the tank top large enough to accommodate the fuse is located adjacent the contact block. One ferrule of the fuse is provided with a cylindrical extension to contact the contact block. The other ferrule is provided with an extension on which is mounted a bushing well and a cover plate.

Abstract: A drywell fuse holder and a loadbreak fuse assembly, the holder including an arc-extinguishing sleeve located adjacent to the inner contact sleeve, the loadbreak fuse assembly including a non-expulsion fuse having electrical interface assemblies at each end spaced apart a distance less than the distance the inlet to the contact sleeves in the fuse holder, the interface assemblies including a spacer ring to center the fuse assembly in the holder and protect the garter spring contact and an arcing washer to transfer the arc from the garter spring; and an arc-extinguishing follower on the fuse assembly which is pulled through the arc-extinguishing sleeve to extinguish the arc.

Abstract: A fuse recloser for placing a fuse in a vertically oriented fuse holder includes a channel-shaped fuse shoe pivotally mounted within a channel-shaped support. The side arms of the shoe and support flex and the shoe releasably grips a fuse. The exterior of the fuse shoe includes cam surfaces which engage with the outer ends of the support which serve to collapse the shoe onto the fuse while permitting a forced release of the fuse shoe from the support. A release lever is provided for initial separation of the fuse shoe and support, after which the shoe is readily removed from the fuse. A U-shaped handle extends from the support outwardly and then rearwardly in offset relation to the support. A flexible line is secured to the outer end of the offset handle member with a fuse in the shoe and the shoe within the support. The one end of the fuse is placed in lower pivotal mount on the fuse holder and depends downwardly therefrom with the offset handle member extending upwardly.

Abstract: A high voltage transformer bushing having an inner conductor extending from a lower end to a point spaced from an upper end and having a side terminal at that point connected to a fuse link which is in turn connected to a high voltage line connector supported on the upper end of the bushing. A lightning arrester supported by and grounded to the transformer casing has an upper end spaced from the high voltage line connector to provide a spark gap.

Abstract: Protected liquid-filled electrical inductive apparatus having a dry well fuse assembly which includes a dry well fuse holder sealingly disposed through an opening in the associated metallic casing, separate from the electrical bushings, and a removable fuse portion. Ionization of the air within the fuse holder is prevented by a resilient plug mounted on the removable fuse portion which, when the fuse portion is assembled within the dry well fuse holder, is immediately adjacent to the electrical terminal which is closest to the grounded casing. The resilient plug member provides an air seal adjacent to the terminal without providing a pressure seal within the receptacle.

Abstract: A protective device for electrical power distribution equipment includes a removable fuse holder and an integral load switch. The protective device may be affixed to a grounded metal enclosure, such as an oil-filled transformer, into which the protective device extends. The fuse holder may be removed from the protective device for checking or replacement with a minimal opening into the enclosure into which the protective device extends. A suitable load switch actuator is provided for controlling current flow through a fuse in the fuse holder. This load switch actuator also provides an interlock arrangement to prevent removal of the fuse holder from, as well as insertion of the fuse holder into, the protective device unless the load switch is open, thus ensuring that interruption and initation of current flow through the fuse in the removable fuse holder is controlled by the load switch.

Abstract: A current limiting apparatus comprises a current limiter and cooling fins formed on each current terminal of the current limiter, and additional cooling fins fitted on a cylindrical tube of the current limiter near a heat generating source.

Abstract: A novel housing structure for a high voltage power supply results in an easily replaceable electrical high voltage bushing. In this an elongated electrode is attached at an end to a support member and extends through an opening in a boundary plate, which is spaced from and supports said support member, and a hollow elongated electrical insulator, the "bushing," ensleeves said electrode and extends through said boundary plate opening to said insulating support means. A film coating is provided on the electrode and a like film coating is provided on the elongated insulator. The voids within the housing are filled with conventional "potting" material. The film coatings are moisture impervious to serve as moisture barriers and are indissoluble in, essentially, and nonadhesive with the potting material to allow detachment of the bushing.

Abstract: An enclosing structure for an electric fuse having a fusible element disposed within a tubular casing of insulating material and interconnected at its ends with terminals mounted on the casing ends comprises an elongated tubular enclosure formed of insulating and semiconducting material and disposed about the fuse with its inner surface in heat transferring surface contacting relation therewith and a rigid metallic heat absorbing sleeve imbedded in the elongated enclosure to absorb heat therefrom and to impart a degree of mechanical strength thereto. Semiconducting sleeves which form parts of the tubular enclosure include an outer sheath which is grounded and inner sleeve elements arranged so as to isolate the fuse and the contacts of the fuse enclosing structure thereby to inhibit corona discharge from the conducting parts.

Abstract: A cylindrical sleeve having annular flanges is formed of irradiated terpolymers of ethylene, propylene, and a diene monomer (EPDM) material. The sleeve is then expanded, but the irradiated EPDM material has a "memory" which tends to cause it to return to its original dimension when heated to a predetermined elevated temperature. The expanded sleeve is positioned over the body of a current limiting fuse and heated so that the sleeve shrinks back to tend to assume its original dimension thereby sealing the sleeve around the body of the fuse. The inside surface of the sleeve may be coated with a thermosetting plastic sealing coating which softens at the elevated temperature further aiding in sealing between the fuse body and the sleeve. The sleeve may be heated in a vacuum oven to ensure that air is not trapped between the body of the fuse and the sleeve.

Abstract: A current-limiting fuse capable of interrupting a wide range of current values is located within the bore of a porcelain insulator. One end of the fuse is connected to an outer terminal which is located at one end of the bushing insulator. The other end of the current-limiting fuse is connected to a stud which extends through a retaining washer located at the inside end of the busing insulator. The stud is tightened against the retaining washer to secure the current-limiting fuse and to maintain the retaining washer against the lower end of the bushing insulator. The bore extending through the bushing insulator is enlarged in the region adjacent to the lower end of the current-limiting fuse to permit the placement of an insulating cylindrical sleeve between the bushing insulator and the lower end of the current-limiting fuse.

Abstract: A fused high voltage electrical bushing having a housing formed of a ceramic dielectric material, porcelain or glass, and having an axially extending passage, an electric terminal at each end of said passage, a fusible element within said passage interconnecting the terminals, a granular dielectric material completely filling the passage, a conductive layer of material on the inside surface of the passage, and a heat insulating sleeve positioned in the passage between the granular dielectric material and the inside surface of the housing to insulate the housing from the heat of the arc on interruption.

Abstract: A fused high voltage electrical bushing adapted to be mounted at the entrance in a casing to an electrical apparatus to provide a connection between a high voltage cable and the electrical apparatus, the bushing including a housing formed of a dielectric material and having an axially extending passage, an electrical terminal sealed to each end of said passage, a fusible element within said passage, interconnecting the terminals, and a granular dielectric material completely filling the passage; a layer of electrically conductive material is provided on the inner surface of said passage and extends through the entrance in the casing to the electrical apparatus, the inner layer of material being spaced from and electrically connected to the element, and a layer of electrically conductive material on the outer surface of said housing for forming a stress cone at the entrance of the casing to said apparatus, the stress cone being grounded through said casing, the inner and outer layers cooperating to reduce volt