Showing papers by "General Cable published in 1972"

"d."internal shield in telephone cables

Abstract: A screen of D-shaped cross-section surrounds the conductor pairs of one half of the core of a communication cable to prevent cross-talk between different circuits; and this construction permits the core to be made with two sections, each of semi cylindrical cross-section. A semi circular portion of the Dshaped screen confronts the inside surface of an overall shield of the cable but avoids electrical continuity with this shield to keep lightning that strikes the shield from entering the core of the cable.

Adaptor for modifying connector to accommodate smaller conductors

Abstract: Communication cables are connected together by inserting end portions of insulated conductors into connectors having inwardly projecting tangs, and the connectors are then compressed to grip the wires and force the tangs to cut through the insulation and part way through the wires to hold the wires firmly in the connector and in an electrical circuit with each other. Such standard connectors could not be used with wires smaller than No. 26 AWG. This invention places an adaptor in the connector as a stop to limit the flattening of the connector against the wires, and to prevent the connector sleeve from closing tight enough to cut through wires as small as No. 28 AWG. The range of wire sizes that the connector can be used for is thereby extended.

Method of applying and cooling low density polyethylene cable insulation

Abstract: This method of applying polyethylene insulation to an electric cable and cooling the polyethylene maintains the thermal stresses in the cooling polyethylene within sufficiently narrow limits so that shrinkage of thick walls of polyethylene insulation do not cause voids in the insulation, and particularly along the inner surfaces of the insulation. The insulation is extruded over a conductor and the insulation then passes through a plurality of cooling baths where the temperature and rate of cooling are controled in such a way as to avoid the setting up of thermal stresses sufficient to cause the formation of voids. The method is suitable for general application and is not tailor made to suit a particular size of wire having a particular thickness of insulation.

Ground level terminal housing

Abstract: A telephone cable terminal housing adapted to lie flat on the level ground, without excavation. A ground plate has a wide flat ground engaging border and a raised central mounting platform joined by an upstanding wall forming an outward-facing peripheral shoulder. A bell jar cover fits over the platform with its continuous side wall close about and overlapping the peripheral shoulder to enclose equipment mounted on the platform. The platform has a cable entrance opening and forms a mounting base for cable terminal apparatus. This includes terminal strips each having a support bar and resiliently bendable integral legs with T-heads that snap into T-slots in the platform or into similar Tslots in the ends of previously mounted terminal strips. For cable-to-cable splicing, corresponding bundles of wires from the cables are brought together across the terminal strips in one or more tiers and the corresponding wires spliced together. Other wires connect selected cable wires to terminal blocks for service connection, to loading coils, etc. The terminal housing provides all the advantages of an above-ground terminal housing with improved access and as good or better production of the equipment therein, it avoids the difficulties and hazards of underground housings while its ground-level mounting and low silhouette minimizes its visual and physical obstruction of the ground area on which it is mounted.

Mechanical pressure type electrical connections for terminating and connecting metallic cable shields

Abstract: This invention is a support formed from a flat strip that is bent around electric cable and that has its ends interlocked to form a short section of tubing which is inserted between the insulation shield and the metal shield that surrounds the insulation shield. It is used at splices and other terminations to support the metal shield so that contact rings, connectors and the like can be clamped to the outside of the metal shield without exerting force on the insulation of the cable. cable.

Apparatus for detection of shield imperfections in electrical conductors

Abstract: This invention uses a tip, or tip assembly, of an extrusion die as an electrode for detecting skips or other imperfections in the strand shield on the conductor of an electrical cable. The tip is insulated from the extruder, or otherwise insulated from ground, so that some electrical potential can be maintained on the tip. Changes between the tip potential and that of the extruder or ground are used to detect defects in the strand shield on the cable. Defects in the strand shield are detected and the location recorded by the detector, and can be detected and recorded on a tape or other record so that the location of the defect along the length of the cable is known.

Optical scanning of electrical cable shields

Abstract: This apparatus, for detecting abnormalities in an electrical cable, has probes located at angularly spaced locations around the circumference of the cable. The probes are means for directing light beams against the surface of the cable and are light sensitive elements that pick up the light reflected from the cable surface. As the cable advances with continuous motion through a testing station, changes in the amount of light reflected operate detectors. Adjacent probes are connected with bridge circuits to make the operation independent of changes in the ambient light conditions. This feature utilizes axial as well as angular spacing of adjacent probes. A hinge sleeve for holding the probes facilitates application and removal of the test apparatus to and from the cable; and the sleeve opens automatically to pass protruberances of the cable which would strike the probes.

Layer winding wire using an electric eye as a control

Abstract: This apparatus winds wire on a reel in layers and controls the winding by the traverse movement of sheaves over which the wire passes on its way to the reel. A first guide sheave is traversed mechanically but its position is controled by a proximity switch. After passing over the mechanically traversed guide sheave, the wire travels around a free floating guide sheave, and then around the reel ahead of the layer of wire that is being wrapped. The wire or cable then travels back to a second free floating sheave that moves according to the winding of the wire of each layer on the reel. The shift of this second free floating sheave controls the mechanical traverse in accordance with the movement of a light beam which is responsive to the movement of the second free floating sheave.

Development and Installation of 138 kV Cable for Tests at EEI Waltz Mill Station: Cable 22

Abstract: This paper covers General Cable Corporation's research, development and qualification testing of a 138 kV cable having extruded cross-linked polyethylene insulation. Also discussed is the manufacture, factory testing and installation of a length of this cable at the Edison Electric Institute test site at Waltz Mill, Pennsylvania. The accelerated life tests being performed at Waltz Mill will serve to evaluate and establish the performance of 138 kV cross-linked polyethylene insulated power cable designed and manufactured in accord with current technology.

Apparatus including capacitive bridge circuit for measuring ac power losses

Abstract: Apparatus for measuring power losses in high voltage equipment, in which a relatively high capacitive current is produced, such as overhead power lines, utilizes a wattmeter and a test potential transformer. For eliminating from the current coil the effect of the capacitive component of current which is generated in the equipment under test, a variable resistor and a variable capacitor in series are connected in parallel with the current coil of the wattmeter for matching the voltage drop and capacitance of the portion of the test circuit that includes the current coil and a capacitor between the current coil and the transformer. Alternate means are shown for applying stepped down voltage from the transformer to the potential coil of the wattmeter.