Abstract: A stator winding insulation for improving the dielectric and thermal properties of a main insulation of a conductor bar of an electric machine. The stator winding insulation includes a mica band having at least one layer-like carrier composed of longitudinal threads and transverse threads and a mica-containing layer fixed to at least one face of the carrier with the aid of a binder. In the layer-like carrier, the volume ratio of the longitudinal threads to the transverse threads is greater than or equal to 2.5:1 and a weight ratio of the mica in the mica-containing layer to the layer-like carrier in the mica band is greater than or equal to 6:1.

Abstract: A method of forming a polymer insulator is disclosed. The improvement includes the steps of: setting a formed body, having a construction such that a pre-form material is arranged around a rod and end caps are arranged at both end portions of the rod, between an upper die and a lower die, each die having cavities for forming sheds and sheath portions of the polymer insulator; and forming the sheds and the sheath portions of the polymer insulator by means of a compression forming by connecting the upper die and the lower die with compression pressure; wherein the end cap has a shape such that it is accommodated in the cavity for a shed formation.

Abstract: An electrical insulating polyester film has an apparent density of 1.37 to 0.85 g/cm.sup.3 and a tensile modulus of 2.0 to 4.5 GPa.A film having low oligomer content, low cost, high heat resistance, high impact resistance, superior machinability and processability, assembling stability, and superior visibility is obtained. Furthermore, leakage of current is reduced when it is used for motor insulation.

Abstract: An insulator for high frequency connectors which comprises a thermoplastic norbornene resin and has a voltage and standing wave ratio of 1.89 or less even in the high frequency band of 2-3 GHz, and a high frequency connector using the insulator.

Abstract: A polyethylene terephthalate film suited for motor insulation is described having the following:(a) an intrinsic viscosity of 0.80;(b) a lateral crystalline size of not greater than 65 Angstroms;(c) an extractable oligomer content of no more than 0.6% by wt.;(d) a hydrolytic lifetime of at least 500 hours;(e) a density within the range from 1.385 to 1.395;(f) no more than 3% by weight comonomer;(g) no more then 1.5% by weight of diethylene glycol as a comonomer;(h) a carboxyl content of no more than 25 milliequivalents per gram of polymer;(i) a particulate content of 0.1 to 2 weight % with the proviso that the polyethylene terephthalate film does not contain an end capping agent; and(j) an embrittlement time at 160.degree. C. of more than 100 days.

Abstract: In a core assembly, a stretchable sleeve capable of recovering toward an initial unstretched configuration is supported on a hollow core. The core includes a plurality of structural elements connected by a plurality of linking elements that extend transversely of the structural elements. A mechanism is provided and connected to the distal end of the core whereby the core can be withdrawn from the sleeve in its axial direction by manipulating the mechanism allowing the sleeve to return to the initial unstretched configuration.

Abstract: A section insulator for securing adjoining overhead contact wires for use by electric vehicles having a current collector, such section insulator including structural members to prevent destructive arcing caused by the passage of the current collector thereover. The structural members include first and second tension beams with replaceable arc shields mounted thereon, an adjustable center runner which can be lowered to compensate for wear, and arcing horns of a configuration to aid in the dissipation of electric arcs away from the structural members.

Abstract: A supporting insulator has an insulator body in the form of a disk and is made of a cured casting resin, and has at least one cast-in fitting to which high voltage is applied and which is cast in the insulator body and passes therethrough. The cast-in fitting has a cylindrically constructed outer surface which the insulator body encloses. A lip which tapers outwards and is closely connected to the outer surface of the cast-in fitting, is integrally formed on the insulator body. The lip mechanically decouples an edge zone of the insulator body from the actual insulator body.

Abstract: A biaxially oriented polyester film which has excellent resistances to dry heat deterioration and wet heat deterioration, which can withstand the use in an atmosphere of relatively high moisture content, and which is useful, for example, as an electrical insulating film, a film for transparent electrode, a film for absorption of electromagnetic wave (e.g. a film used as an inspection window of microwave oven) and a reflection film. This polyester contains ?ethylene-2,6-naphthalenedicarboxylate as the main recurring unit.! 99.5 to 95 mole % of ethylene-2,6-naphthalenedicarboxylate and 0.5 to 5 mole % of ethylene-2,7-naphthalenedicarboxylate and has a density of 1.355 to 1.370 g/cm.sup.3 and an intrinsic viscosity of 0.62 to 0.90. The polyester film has an amount of terminal carboxyl in the polyester of 40 eg/10.sup.6 g or less and an amount of oligomers of 2.0 mg/m.sup.2 film or less.

Abstract: A tubular shaped device for insulating an electrical component such as, but not limited to, a dry film capacitor. Along one edge of the device is a rectangular shaped cutout for receiving radially extending leads of the electrical component. The electrical component is secured within the device by spreading the device open, placing the electrical component within the spread-open device, positioning the leads of the electrical component within the cutout and finally permitting the device to once again assume its tubular shape.

Abstract: According to this invention, there is disclosed a thermal conductivity substrate which includes an aluminum nitride sintered body and a coating layer formed on the body of aluminum phosphate and having a surface roughness of 1 .mu.m or less, and which has excellent humidity resistance and chemical resistance.

Abstract: An insulated link using new castable insulating materials and interim molds. A strong, insulating cast dielectric is assembled with metal plates to form a core assembly. A low viscosity bonding compound introduced into the core prior to casting an outer dielectric jacket eliminates the formation of air pockets. This construction provides a link that can support heavy loads and that has strong dielectric properties. The simplified method of construction of the link increases manufacturing yields, as well as the durability, ultraviolet resistance, and electrical resistance of the link.

Abstract: A modular, stackable insulating structure for a very high-voltage coaxial cable comprises at least three interspaced insulating tubes accommodating an inner conductor and an outer conductor of the coaxial cable. A plurality of ribs extending essentially radially along the longitudinal axis of the structure provide the spacing between adjacent tubes. The ribs are disposed in an optimized manner such that relatively effective zig-zag insulating paths are created between the inner and the outer conductors. The structure comprises cooling means.The insulating structure may be used for the transmission of electromagnetic pulses (power peaks) at voltages in the order of megavolts with rise times in the order of picoseconds.

Abstract: A plasma enhanced chemical vapor deposition process for producing a fluorinated silicon nitride film on a substrate is disclosed. The process utilizes a mixture of silane, perfluorosilane and nitrogen to produce films of high conformality and stability. The silane and perfluorosilane in the mixture are in a ratio of 0.05 to 1 on a volume basis. The preferred silane is SiH.sub.4 and the preferred perfluorosilane is SiF.sub.4. Films prepared by the process are disclosed and their properties are described.

Abstract: This invention relates to a lead-free ceramic insulator, such as that utilized in headlamp switching assemblies. The composition utilized to make the lead-free ceramic insulator includes low melting glasses which form low-viscosity liquids at low temperatures. The glasses generally contain alkali and/or alkaline earth oxides and boron oxide. Aluminum oxide may be added to compensate for the alkali and alkaline earth containing glasses which are sensitive to corrosion by water. The compositions have a low sintering temperature.

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: An electromagnetic wave shielding building material is disclosed, the building material comprising an electrically conductive concrete which has electromagnetic wave shielding properties and comprises a hydraulic inorganic material and carbon fibers of 0.6-3% by weight. It is possible to easily produce the building material having good electromagnetic wave shielding functions at low cost.

Abstract: An insulating boot for use with an electrical device that is attached to a outlet box. The box is attached to wall studs and may hold one or more electrical device, such as snap or dimmer switches, electrical outlets, television cables, telephone jacks and the like. The boot is made of a non-conducting, elastic material in the form of a strip the ends of which adhere to form a loop that snap around the circumference of the device. A second strip follows a second circumference around the back of the device and attaches by adhering to the first strip at a position between the ends of the first strip so as to to interfere with the attachment of the two ends of the first strip. The insulating boot prevents the shorting of the terminal of a device against the grounded outlet box wall or against the terminals of an adjacent device.

Abstract: An insulating spacer comprises a plurality of unit spacers each of which has a hollow portion. The unit spacers are disposed between two members, such as electrodes, so that side walls of peripheral portions of the unit spacers are not aligned on a plane between the two members. There is no possibility that the space between the two members may be filled, for the most part, with insulating solid material; and a narrow gap may be present at the remaining minor part of the space. Therefore, there is no possibility of a local concentration of electric field between the two members.

Abstract: An epoxy resin composition comprising a novolak type epoxy resin which is produced from a substituted-phenol novolak and epihalohydrin, and is 0.15 or less in a maximum absorbance of a 3% (W/V) dichloromethane solution of the epoxy resin, the absorbance being measured at a wave number of between 3570 and 3600 cm.sup.-1 with an infrared spectrophotometer having a cell of 2 mm length, which is useful particularly in encapsulating and laminating applications in electronic fields.

Abstract: Process for reducing the water vapour diffusion in a plastics composite insulator consisting of several layers by incorporation of at least one mica-containing layer as diffusion barrier in the form of a surface or intermediate layer on at least one plastics body, constituting the composite insulator.

Abstract: Electrically insulating composite materials formed from (1) epoxy resins and (2) polymeric fiber reinforcement which have high strength are formed if the cross-linking of the epoxy resin is accomplished by anionic polymerization using tertiary amines of the formula ##STR1## as catalyst.

Abstract: Connection insulators having a plurality of insulating compartments for electrically isolating electrical connections formed from strips of insulating material of indeterminate length. In one embodiment, a first strip of insulating material is supplied to a securing station at a predetermined average rate of supply and a second strip of insulating material is supplied to a forming station at a predetermined average rate of supply greater than the predetermined average rate of supply of the first strip with the pliability of the second strip being enhanced by heating the strip for aiding the deformability characteristics of the second strip. The second strip of insulating material is deformed into predetermined patterns at the forming station and then moved into position adjacent to the first strip of insulating material at the securing station.

Abstract: A superior insulator body having at least one thread is produced by vibration molding an acicular aggregate and a synthetic resin binder against an appropriate die.

Abstract: A non-conductive safety line and method for producing the safety line is disclosed. The safety line of the preferred embodiment comprises a rope core which has an exterior tubing positioned over the rope core with a quantity of filler material contained within the exterior tubing to completely capsulate the rope core. End loop splices are formed on the rope core ends and a pair of shrinkable tubing sections are positioned over the end loop splices. The completed safety line has a film applied to the exterior thereof to prevent surface wetting. The safety line may be used in conjunction with aerial buckets or hot boards from a lineman's body belt to the boom of an aerial lift or platform of an insulated hot board. The line maintains dielectric integrity, wet or dry, preventing shorting of the lineman's insulation from ground as conventional safety lines can do.

Abstract: A solid insulator having high electrical resistance of inorganic and organic materials such as ceramic, glass, plastics, resins which is treated by application of an ion beam to the insulator surface to effect incorporation by controlled implantation of ions in the insulator adjacent its surface to produce an insulator surface of desired conductivity. This overcomes the difficulties due to uneven voltage distributions on the insulator surface which can cause discharges and even the destruction of the insulator.

Abstract: The method for manufacturing profiled laminated insulation material having a U- or L-shaped configuration for installation in the slots of a dynamo-electric machine wherein a number of carrier bands of an epoxide resin-impregnated or resin-coated insulation material such as a combination of layers of aromatic polyamide paper and woven glass filaments are assembled for lamination each to the other.

Abstract: The invention is directed to a laminar insulating material for electrical apparatus insulated by a fluid such as an insulating gas or an insulating liquid. The laminar insulating material includes two cover layers which are made of a material of relatively high density and an insulating material of relatively low density which is permeable for the fluid and fills the space between the cover layers.The invention is particularly well suited for the manufacture of the housings of overvoltage arresters which are arranged in the metal encapsulation of a gas-insulated, high-voltage installation. The laminar insulating material accomplishes here a faultless separation between the insulating gas in the metal encapsulation and that in the overvoltage arrester. Gases which penetrate the cover layers can be led off to the outside from the gas-permeable insulating material.

Abstract: A metal member is coated with or embedded in a high-magnesia glass-ceramic material having the approximate composition of about 60 to 80 weight percent SiO.sub.2, 12 to 20 weight percent Li.sub.2 O, 2 to 14 weight percent MgO, 1.5 to 6 weight percent P.sub.2 O.sub.5, 1 to 7 weight percent of an alkali oxide selected from the group consisting of K.sub.2 O and Na.sub.2 O and their mixtures, 0 to 2 weight percent of a transition metal oxide selected from the group consisting of Co.sub.3 O.sub.4, MnO.sub.2, Fe.sub.2 O.sub.3, V.sub.2 O.sub.5 and WO.sub.3 and their mixtures, 0 to 5 weight percent PbO, 0 to 2 weight percent Al.sub.2 O.sub.3 and 0 to 1 weight percent As.sub.2 O.sub.3.