Abstract: An automatic by-pass valving system for an electrical cable system wherein insulating fluid at a pressure above atmospheric pressure is supplied to an electrical power cable, such as a pipe-type or self-contained cable, having a fluid flow channel and having at least one hydraulic stop interrupting the flow of fluid between the channels of adjacent portions of the cable which are at different elevations. The valving system comprises a check valve, which allows fluid flow only in a first direction, from the lower elevation portion to the higher elevation portion, and a flow-limiting valve, which allows fluid flow only in a second direction, from the higher elevation portion to the lower elevation portion, at a reduced rate. Preferably, a relief valve is also provided to allow fluid flow in the second direction at a higher rate if the fluid pressure difference in the second direction is exceeded by a predetermined amount.

Abstract: A method of controlling insulating fluid flow between fluid channels in sections of an electrical power cable at different elevations, the channel of one section being isolated from the channel of a next adjacent section by a hydraulic stop, to limit the loss of insulating fluid when a seciton is ruptured and yet permit a limited flow from the point of rupture to protect the cable from contamination. Fluid at a high rate from a lower section to adjacent higher sections around the stop is permitted by a check valve which substantially prevents fluid flow in the opposite direction and a flow-limiting valve permits fluid flow at a low rate from the higher section to the lower section. The fluid pressure difference between the sections may be relieved by a relief valve if the difference exceeds a predetermined amount.

Abstract: A joint with a boss for fitting to an assembly compartment for assembling together two adjacent lengths of a long-distance gas-insulated three-phase cable, the joint including a boss containing the seats of an externally-controllable valve whose drive combinations make it possible to establish communication independently either between the inside volumes of adjacent lengths, or the outside of the cable with the inside volumes of both adjacent lengths, or the outside of the cable with the inside volumes of one only of the lengths.

Abstract: An electrical cable holding case that can prevent a charged resin material for sealing from cracking by blocking the sharp bending of electrical cables when they are taken out of the case is provided. An electrical cable holding case includes a cylindrical case main body and a lid-like rear holder having electrical insertion holes and resin charging holes. Electrical cables taken out of the case main body via the electrical cable insertion hole of the rear holder are embedded by resin molding from the case main body to the outer surface of the rear holder to hold the electrical cables so as to be watertight. Electrical cable support walls are arranged at the edges of the electrical cable insertion holes outside the rear holder.

Abstract: A waterproof construction of a wire for a motor vehicle, which wire has one or more strands and an insulating coating surrounding the strands and is connected to a nonwatertight terminal including a terminal fixed directly to a body of the motor vehicle and a terminal mounted on a nonwatertight connector, wherein at a portion of the wire between its location connected to the nonwatertight terminal and a first branch point, the insulating coating is removed from the wire so as to expose the strands and waterproof material is filled among the strands such that an insulating and waterproofing coating member is wound around an outer periphery of the waterproof material.

Abstract: A blockstop which is formed by kneading a curable, water-resistant kneading compound tightly onto the end of the cable and then covering the compound with a shrinkable envelope. Preferably the kneading compound is applied in three layers and the shrinkable envelope is a cold shrinkable tape wound onto the outer layer.

Abstract: An electrical cable in-line or branch joint has hydrophobic material located around the connections of the conductors so as to act as a water block. The hydrophobic material is physically prevented from being forced away from the connections into the cables, for example by pressure of water within the cable, by a fibrous material located in and around the crutch regions where the conductors emerge from the cable joints.

Abstract: A two way fluid flow check valve includes a plug movable reciprocally lengthwise of the valve against either of respective valve seats within a valve housing. A fixed partition which acts as a piston is located within a cylindrical cavity of the plug. The plug is slidable on a pair of hollow tubes centrally of the housing, the tubes supporting the fixed partition therebetween. The tubes provide respective fluid passages from either end of the housing into the plug cavity on the opposite side of the partition. Upon leakage in the pipe on either side of the valve, the plug will move in response to internal and external fluid pressures from the opposite side, towards the direction of lowered fluid pressure, and will seat against a mating valve seat at that end of the housing, thereby closing the valve.

Abstract: An electric wire holding case which prevents oil from leaking through an electric wire extending into the oil cover of a transmission case or the like. A body and a lid-like holder are included; a partition wall having electric wire insertion holes is provided inside the cylindrical portion of the body; partition chambers are defined on the wall in such a manner that the chambers communicate with the holes at one end of each of the chambers and are open at the other ends thereof; the holder has electric wire insertion holes, and resin injection holes; an engagement member is secured to the exposed portion and accommodated in the chamber corresponding thereto; the chamber is closed at the latter end thereof by the holder; and the resin, which has a softness after being set, is filled into the chamber through the resin injection hole and solidified in the chamber.

Abstract: A two way fluid flow check valve includes a plug movable reciprocally lengthwise of the valve against either of respective valve seats within a valve housing. A fixed partition which acts as a piston is located within a cylindrical cavity of the plug. The plug is slidable on a pair of hollow tubes centrally of the housing, the tubes supporting the fixed partition therebetween. The tubes provide respective fluid passages from either end of the housing into the plug cavity on the opposite side of the partition. Upon leakage in the pipe on either side of the valve, the plug will move in response to internal and external fluid pressures from the opposite side, towards the direction of lowered fluid pressure, and will seat against a mating valve seat at that end of the housing, thereby closing the valve.

Abstract: A sealing arrangement having a pre-sealing element and a pourable sealing compound. The sealing arrangement is intended for use in electrical cables where several insulated conductors are enclosed within an insulating hose. To achieve the desired moisture-resistant sealing effect with minimal expenditure of time and material, and to avoid damage to the cable and/or conductors, the pre-sealing element is in the form of an elastic sheath which encloses all the individual conductors at a pre-set location. The sheath comprises a tubular portion which tightly encloses the conductors, pressing them together, and a funnel-shaped portion joined with it, which fits tightly against the wall of the insulating hose.

Abstract: Epoxy-grafted, low molecular weight amorphous polymer compositions are employed in pourable, liquid telecommunication cable encapsulation compositions. Also disclosed is a method for encapsulating telecommunication cables as well as cables encapsulated with such an epoxy-grafted liquid encapsulant.

Abstract: This invention relates to an assembly of a splice between a cable containing paper insulation and a cable containing oil or petroleum based materials wherein the splice, or at least the end of the cable containing the oil or petroleum based material, is encapsulated in a particulate material such as calcium carbonate and placed under compression in order to prevent the oil or petroleum based material in one cable from migrating into the splice area or into the other cable and damaging the paper insulation in the splice or the other cable. The assembly also prevents the migration of water from either cable into the splice area.

Abstract: A joint between a pair of electrical cables of different types, such as an oil filled cable and a cable with extruded insulation. Both cable ends have tapered insulation and stepped layers outwardly of the insulation and the conductor of one cable is mechanically and electrically connected to the conductor of the other cable by a rod surrounded by a body of insulation. Portions of the insulation at opposite ends of the body and the tapered insulations are respectively covered by insulation applied thereto during installation of the joint. The tapered insulation of the oil filled cable is enclosed by a housing in fluid tight engagement with the body and the sheath of the oil filled cable and filled with the oil of the oil filled cable. The insulation surrounding a portion of the body and the tapered insulation of the cable with extruded insulation is adhesively bonded to such portion of the body.

Abstract: A stop joint between a pair of electrical cables of different types, such as an oil filled cable and a cable with extruded insulation. Both cable ends are terminated in a known manner except that the conductor of one cable is mechanically and electrically connected to the conductor of the other cable by a rod surrounded by a body of insulation, portions of the insulation at opposite ends thereof being respectively covered by the insulation of the terminating elements of one cable and by the insulation of the terminating elements of the other cable. The body has a flange which is clamped to one of the cable terminating elements, and to provide electrical interconnection of the cable shields, the central portion of the body is covered with a semiconductive varnish.

Abstract: A fitting which couples two conduit members in a manner to permit relative longitudinal motion therebetween and which prevents the gases within the fitting from escaping at a temperature which might ignite an external ambient atmosphere. One form of the fitting includes a bushing affixed to an end of one of the conduit members and positioned and configured to mate with the interior of a body member affixed to an end of the other conduit member to permit sliding motion therebetween. The bushing has sufficient surface area in close proximity to the interior surface of the body member as to cause any gases passed between the bushing and body member to approach a temperature equilibrium with the body member.

Abstract: In a cable stub assembly (20) which is used to interconnect two cables (22 and 24), at least one of which is pressurized with a gaseous medium, a portion of a plastic jacket is removed from an interior portion of a length (31) of cable to expose conductors (33--33) of a core (32). Heat shrinkable sleeves (61 and 66) each of which comprises an irradiation cross-linked polyolefin material are positioned over the jacket of the cable on each side of the interior portion from which the jacket has been removed. The heat shrinkable sleeves are caused to contract about the cable jacket. Inner surfaces of the sleeves are coated with an adhesive material which is helpful in providing a sealed engagement of the sleeves with the jacket. A length of tubing (81) is disposed about the cable jacket and the contracted sleeves. A polyurethane filling material (82) is introduced into the tubing and is adhered sufficiently to the sleeves to prevent substantially the escape of the gaseous medium from the at least one cable.

Abstract: Cable plug and method of manufacture in which hardened plugging compound surrounds individually insulated conductors and a radially resilient spring is placed around the compound which holds the spring permanently in a resiliently expanded condition to compress the compound onto the individual insulations of the conductors. In one arrangement a sleeve surrounds and intimately contacts the compound and at least one rib on the inner surface of the sleeve is urged against a complementary groove in the compound by the spring.

Abstract: A stop joint for a pair of electric cables having fluid under pressure therein in which the fluid impermeable pipe or shield around the cable, which is spaced at its end from the bared conductor end to expose the cable insulation, is connected to the connector for interconnecting the cable ends by a multi-part stop tube having an intermediate portion of insulating material and a pair of end portions bonded to respective ends of the intermediate portion, the end portions being made of an insulating material rendered conductive by the addition of conductive material or of insulating material having a conductive layer thereon for forming electrodes for electrical stress distribution purposes. The electrodes have substantially the same coefficient of expansion as the material of the intermediate tube portion to prevent separation of the end portions from the intermediate portion with temperature changes.

Abstract: In a stop joint between fluid-filled electric cables, the barrier to flow of dielectric fluid from one to the other of the cables comprises an elongate metal member, by which the cable conductors are both electrically and mechanically connected, and a flexible membrane of fluid-impermeable insulating material. The membrane, which is a single sheet of the insulating material, is sealed to the elongate metal member and to the fluid-tight joint enclosure and is incorporated in a fluid-impregnated laminated body of lappings of paper and/or other insulating material built up on the elongate metal member and on the cut back ends of the cables.

Abstract: Risk that metal particles carried by flowing oil in an oil-filled cable joint or termination will settle along an oil path between a cable conductor and the space bounded by the joint or termination enclosure is substantially reduced by making at least part, and preferably the whole, of the boundary wall of the path of a fibrous insulating material, e.g., paper, and by providing, at at least one end of the path, for filtering from flowing oil particles of metal and other undesirable materials that may be carried by the oil, filtering means comprising, in combination, electrically insulating filtering material and a fine metallic mesh, serving as an electrical screen. Fibres of the boundary wall so formed protrude into the path and restrict mobility of metal particles carried by the flowing oil; some metal particles will penetrate the fibrous insulating material which will also absorb from the oil some types of dissolved contamination, e.g., moisture.

Abstract: The invention provides for the waterproofing of a telephone cable by the incorporation of longitudinal strands within the sheath alongside the insulated conductors. The strands have deposited thereon a moisture sensitive swelling agent, such as ethyl hydrogen cellulose, and in the event of the sheath rupturing and the conductors being exposed to moisture the swelling agent on the strands reacts with the moisture rapidly forming a plug which prevents further ingress of the moisture.

Abstract: A stop or through joint for high voltage, oil filled electric cables having a central conductor with an oil duct, insulation around the cable conductor and a sheath around the insulation which is slightly spaced, at least in part, from the insulation. The bared conductor ends are electrically joined and are surrounded by insulation which does not have a deliberately added oil channel for supplying oil to the duct. The joint is surrounded by a conductive casing, and within the casing, the cable insulation and the space between the insulation and the sheath has oil under pressure supplied thereto so that with variations of the operating conditions which cause oil flow in the cables, oil flows through the cable insulation so as to maintain the necessary oil content of the cables. Also, a cable system with a plurality of such joints intermediate the terminal ends of the cable system.

Abstract: This improved stop joint is used at connections of one length of electric cable to another, for the purpose of preventing fluid in one length of cable from contacting fluid in the next length of cable. The joint includes a stop tube that surrounds the end portion of one length of cable and that is made with a mid-portion of resin base material, preferably reinforced, and end portions of metal connected to the resin base material by fluid-tight connections. These metal end portions are secured to the pipe or shield that surrounds one or both of the lengths of cable. Parts are constructed so as to minimize the time and cost of making the connections between the cable lengths and the connecting of the stop joint with the pipe or shield that surrounds the respective cables.

Abstract: Gas-insulated electrical apparatus is connected to oil-insulated electrical apparatus within an intermediate oil-filled tank having an oil pressure lower than the pressure within the oil-insulated apparatus. If gas leaks into the relatively low pressure oil, the gas contaminated oil cannot leak into the oil-insulated equipment. The intermediate oil-filled tank has larger electrical clearances than the oil-insulated apparatus.

Abstract: Welding apparatus comprising a power and gas transmission cable having coupling means including normally closed valve means for controlling passage of gas from said cable, a first welding torch including a gas passage and having first torch coupling means adapted for connection to said cable coupling means, said torch coupling means including means for opening said valve means with said first torch and cable coupling means connected, and a second welding torch having second torch coupling means adapted for connection to said cable coupling means, said second torch coupling means adapted to maintain said valve means closed with said second torch and cable coupling means connected.

Abstract: Marine electrical cable apparatus has a flexible cable jacket loosely containing cable conductors and filled with a relatively incompressible fluid such as oil. The jacket flexes with changes in the environmental pressure to transmit that pressure to the inner fluid and thereby maintain minimal pressure differential across the jacket walls. Terminations at each end of the cable seal the jacket interior from the environment and feed the cable conductors from within the jacket out for connection with further electrical equipment.

Abstract: A power cable joining device is disclosed for use in connecting or splicing two or more power cables wherein at least one of the power cables may comprise an impregnated paper insulated lead cable. The power cable splice in accordance with the present invention includes spacer element and gasket means which are cooperative with the prepared ends of the connected power cables in a manner to prevent migration of impregnate from the paper insulated power cable to the other connected power cables.