Abstract: In a gas insulated electric apparatus having gas sections filled with insulating gas, a locating device determines a position of a gas section in which an insulation abnormality is detected, on the basis of a detection signal from sensors disposed in each of predetermined gas sections. At the same time a hindering degree diagnosing device diagnoses the degree and the kind of the insulation abnormality, by comparing a detection signal from the sensors with data stored in a data base. A valve control generates a valve control signal, responding to the locating device and the hindering degree diagnosing device, and in response to the valve control signal, a trip circuit generates a valve opening signal to open an electromagnetic valve disposed in a gas section in which an insulation abnormality is detected.

Abstract: A gas filled electric conductor arrangement has an inclined surface (3A) at the bottom side of an electric conductor (3) that is formed by gradually reducing the cross section (D1, D2) of the electric conductor from one insulator spacer (2A) at one side toward another insulator spacer (2B) at the other side. Because of an angle (.theta.) of the inclined surface (3A), the spacing distance between the electric conductor (3) and the bottom surface (1A) of a grounded tank (1) increases depending upon the distance away from one insulator spacer (2A). Thereby, conductive foreign particles (50) are designed to be moved away from the surface of the insulator spacer (2A) and become trapped by a conductive foreign particle (1) disposed at the center bottom surface (1A) of the grounded tank.

Abstract: A fluid filtration system for use with an apparatus, such as an electrical apparatus, having a casing within a working fluid, such as oil, is contained utilizes a filter-supporting flow conduit having an entrance end and an exit end and a filter medium supported within conduit. A pump is also associated with the filter-supporting means for pumping working fluid through the flow conduit between the entrance and the exit ends thereof so that contaminants are filtered from the fluid as it is pumped through the flow conduit. The flow conduit and the pump are adapted to be positioned in a submerged condition within the fluid of the apparatus, and a tension member is used to suspend the flow conduit in a substantially vertical orientation within the fluid so that the entrance end of the conduit is disposed adjacent the bottom of the apparatus casing. By filtering the fluid with the filtration system, the service life of the fluid is extended and the need for frequent servicing of the fluid is obviated.

Abstract: Insulating oil in electric power transmission devices such as a transformer is filtered for removal of accumulated water and carbon particles. The filter and circulation pump are usually located in a separate cabinet external to the transformer with circulation conduits connecting the filter, the pump and the transformer. To prevent or minimize environmental contamination by leaks or ruptures in the oil circulation conduits, oil flow within the pump suction conduit is monitored independently of oil pressure within the pump discharge conduit. A flow rate or discharge pressure below a predetermined minimum operates motor control relays to terminate the pump drive motor operation and transmit appropriate alarms. Additionally, an accumulation of oil in the dry sump volume of a pump and filter housing also activates motor terminating relays and transmits an alarm.

Abstract: A transmission cable system that incorporates cooling channels that encircles electrical conductors with coolant. The transmission cable system also provides for breach or leak detection. More specifically, the transmission cable system maybe used with an inductive charging system that transfers electric power from a power source to batteries of an electric vehicle. The cable system includes a cooling system for storing, cooling, and pumping coolant, and a pressure sensitive switch for determining the pressure in the cooling system and for providing an output signal indicative of a drop in sensed pressure. A controller is coupled to the pressure sensitive switch that is responsive to the output signal from the switch for shutting down the inductive charging system in the event of a drop in sensed pressure. The transmission cable is electrically coupled between the power source and the electric vehicle for coupling electrical power to the batteries.

Abstract: A three-phase electrical power line comprising a sealed tubular envelope of steel filled with insulating gas under pressure, e.g. nitrogen or carbon dioxide CO.sub.2, and having three conductive bars placed therein together with a thin tubular envelope of aluminum which is located between the steel envelope and the bars, wherein the conductive bars are held by collars made of non-magnetic material, having an outside diameter equal to the inside diameter of the aluminum tubular envelope, and possessing three radial arms which are screwed to tabs of insulating supports that enclose the conductive bars.

Abstract: For each phase, a metal-clad line comprises a phase conductor surrounded by an aluminum sheath, with each aluminum sheath being surrounded by a sheath which is gas-tight relative to the outside. The inside of said gas-tight sheath(s) is/are filled with a gas having good dielectric properties. The aluminum sheath is made up of two half-shells with each half-shell being formed by a folded strip whose section is in the form of a semicircle terminated at each end by a shoulder and a flat, with the two half-shells being juxtaposed and assembled to each other via their flats. The invention also provides a method of manufacturing the metal-clad line which is particularly applicable to underground metal-clad lines.

Abstract: The present invention is directed to a method for reducing PCB concentration in an electrical induction apparatus containing a dielectric fluid with greater than 500 ppm PCB to a level of less than about 50 ppm PCB. Dielectric fluid containing greater than 500 ppm PCB is drained from an electrical induction apparatus, and the drained apparatus then is filled with tetrachloroethylene as a first interim dielectric fluid. The apparatus is then electrically operated with the first interim dielectric fluid so as to attain about an equilibrium PCB concentration in the first fluid. The first interim dielectric fluid then is drained from the apparatus and replaced with fresh tetrachloroethylene as a second interim dielectric fluid. The apparatus then is electrically operated with the second interim dielectric fluid so as to attain about an equilibrium PCB concentration in the second fluid.

Abstract: The present invention relates to a water absorbent packet and the method of using the packet in liquids to be kept free of invasive water. The packets are made of sheets of material which allow the water in the liquid to penetrate into the packet and contact the water absorbent material. Any water present in the liquid which contacts the absorbent material is absorbed from the liquid.The packets can be manufactured to the size desired for use in the system to be kept water free and the desired number of compartments of absorbent material. The amount of absorbent material in the compartments can be measured so that upon water absorption the compartment becomes swollen, giving a visual check for the presence of water. The absorbent compound of this invention can be sodium poly-2-propenoate, carboxymethyl cellulose or other form of the super absorbent composition or polymers which will not migrate through the sheets of material when placed in the liquid and when water is absorbed from the liquid.

Abstract: A gas insulated transmission line has an inner conductor supported by insulators including a fixed insulator and a movable insulator with each having recesses in their outer portion having recessed metallic inserts therein of like configuration. The fixed insulator has disposed within the insert a base of an interconnection strap that extends along the sheath and is welded thereto. An insulating standoff button is further provided on the exterior of the base of the interconnection strap and presses against the outer sheath. An insert of the movable insulator contains a roller assembly. Preferably the roller assembly includes a substantially cylindrical roller of a semi-rigid insulating material that has edges bearing against the outer sheath and conforming to the configuration of the outer sheath by reason of deformation under load.

Abstract: A gas insulated electrical apparatus comprising a hermetic sheath filled with an electrically insulating gas having a plurality of electrically conductive sheath sections including hermetically fastened flanged ends. A high voltage conductor is electrically insulatably supported within the sheath by an electrically insulating spacer which is hermetically and securely held at its outer periphery between the flanged ends of the sheath sections. An electrically conductive trap ring is inserted between at least one of the flanged ends of the sheath sections and the outer periphery of the spacer. The trap ring defines, between the trap ring and the spacer, a low electric field particle trap in which a low electric field is formed and in which electrically conductive particles can be trapped and retained.

Abstract: A segmented inner conductor of a transmission line has joints between the segments with a plug on one segment fitting into a socket on an adjacent segment. An electrostatic shield covers the joint and confines particles. Particular features have to do with simplifying the parts and their means of assembly for speed and economy including a plug end having a stop configured for easy assembly with the main portion of an inner conductor segment, a shield with a folded under portion over a bond joining the plug end to the inner segment main portion, spring loaded contacts holding the shield to the plug end, and use of a retaining ring, without bonding, to secure a ring of contact fingers to a socket end.

Abstract: An insulator for supporting the inner conductor of a gas insulated transmission line is configured so that its outer extremity is a simple blunt portion that fits loosely within a bearing block of insulating material of lower dielectric constant than the insulator itself so as to provide structural simplicity and improved performance through lessened breakdown susceptibility. A cylindrical particle trap ring formed of flexible metal sheet material is attached to the bearing block at locations spaced from the insulator.

Abstract: The invention relates to a conductor supporting apparatus for gas insulated equipment in which a high voltage conductor which is arranged in a grounded tank is insulated and supported by an insulating spacer having attaching metal fittings at both end portios. In the apparatus of the invention, a cylindrical insulating barrier having a flange portion on the side of the free end so as to be substantially perpendicular to the surface of the insulating spacer is attached by use of the attaching metal fitting of the insulating spacer on at least the side of the grounded tank. The insulating spacer is surrounded by this insulating barrier through a space. By use of the insulating barrier, the approach of conductive foreign matters to the insulating spacer can be prevented and the high dielectric strength can be maintained.

Abstract: A gas insulated electrical apparatus comprises: a metal pipe in which an insulation gas is sealed; a conductor supported inside of the metal pipe by an insulation supporting member; and an insulation layer provided on the inner surface of the metal pipe. Strong dielectric material is mixed in the insulation layer so that its specific inductive capacity becomes ten or more.

Abstract: A plasma generating device, and in particular a duoplasmatron ion gun, is disclosed that is air cooled, high vacuum compatible and hence very clean with a stable ion current output. The device is mounted to a standard type flange held at ground potential without the necessity of subsequent high voltage isolation. Cooling is achieved with cooling fins and a fan inside a housing in which the duoplasmatron is mounted. A mounting structure includes a vacuum tight ceramic ring brazed between the mounting flange and the gun body. The ceramic ring is located with respect to high permeability magnetic components and a magnetic coil to facilitate a magnetic field for focusing the plasma, allowing the coil to be referenced to ground potential while the gun is maintained at high voltage. A ceramic chamber containing ceramic pellets is located in the plasma-forming gas inlet duct to prevent high voltage electrical discharge in the gas duct.

Abstract: An electret capable of holding electric charges semi-permanently is used to attract conductive particles generated or intruded in a gas-insulated electric apparatus during assembly work including an operation test of movable parts thereof, thus improving the reliability of insulation characteristic of the apparatus.

Abstract: A gas-insulated transmission line includes an outer sheath and an inner conductor disposed therein, which inner conductor is formed from two inner conductor sections electrically connected together. A contact shield surrounds and electrically shields the connection of the two inner conductor sections. Insulating supports spatially support the contact shield within the outer sheath, and the contact shield physically supports the inner conductor sections. The insulating supports thus support the inner conductor through the contact shield.

Abstract: A particle trap is provided for gas insulated transmission lines having a central high voltage conductor supported within an outer coaxial conductive sheath by a dielectric support member. A cavity between the inner conductor and outer sheath is filled with a dielectric insulating gas. A cone-like particle deflector, mounted to the inner conductor, deflects moving particles away from the support member, to radially outer portions of the cavity. A conductive shield is disposed adjacent the outer sheath to form a field-free region in radially outer portions of the cavity, between the shield and the sheath. Particles traveling along the cavity are deflected by the cone-like deflector into the field-free region where they are held immobile. In a vertical embodiment, particles enter the field-free region through an upper end of a gap formed between shield and sheath members. In a horizontal embodiment, the deflector cone has a base which is terminated radially internally of the shield.

Abstract: An improved gas-insulated transmission line is disclosed in which the transmission line itself is constructed in a modular fashion from elements which are joined together, typically at the final installation location, to form the transmission line. The other sheath and the inner conductor can be fabricated separately, at different locations and by different manufacturers, and transmitted to the point of final assembly and installation. A backup ring, insulator support assembly, contact shield, and connection member are separately fabricated into a single modular member, which can by itself be subjected to the testing procedures normally undertaken at the factory. This modular member, after satisfactorily passing its acceptance test, can then be shipped to the installation site.

Abstract: Molecular sieve material is placed in the main condensate return in vaporization-cooled transformers. The sieve material can be removed and replenished without de-energizing the transformer.

Abstract: Polyhalogenated biphenyls such as PCB's, contained in transformer or capacitor oils, are removed from the transformer or capacitor oils by means of a combustible adsorbent which selectively adsorbs polyhalogenated biphenyls from transformer oils and the like. The adsorbent containing the adsorbed polyhalogenated biphenyls and the polyhalogenated biphenyls adsorbed thereon are destroyed by combustion in a molten salt.

Abstract: The central conductor of a gas-insulated flexible cable consists of separate concentric tubes which are alternately spirally corrugated and annularly corrugated so that the corrugations will not nest relative to one another and are axially movable relative to one another.

Abstract: A contaminant trap for a gas-insulated electrical conductor is provided. A resinous dielectric body such as Kel-F wax, grease or other sticky polymeric or oligomeric compound is disposed on the inside wall of the outer housing for the conductor. The resinous body is sufficiently sticky at ambient temperatures to immobilize contaminant particles in the insulating gas on the exposed surfaces thereof. An electric resistance heating element is disposed in the resinous body to selectively raise the temperature of the resinous body to a molten state so that the contaminant particles collected on the surface of the body sink into the body so that the surface of the resinous body is renewed to a particle-less condition and, when cooled, returns to a sticky collecting surface.

Abstract: Transformer, including copper windings, electrical insulation for the windings, the electrical insulation being formed of sections of solid and liquid insulating material, the liquid insulating material serving as a cooling liquid containing a chemical compound from the class of N,N'-dihydrazides as a copper deactivator in a cooling liquid flow, and a supply depot disposed in the cooling liquid flow containing the copper deactivator as a solid material.

Abstract: A gas/vapor electromagnetic induction machine comprises an annular coil container including two coaxial electrically insulating cylinders connected at lower ends to an annular bottom plate and coaxially disposed around an iron core within an enclosed tank charged with a non-condensable electrically insulating gas and a condensable cooling gas. A dripping pan receives a condensate of the cooling gas located on the lower portion of the tank through the operation of a pump and drops the condensate into the annular coil container and onto the iron core assembly located within the annular coil container. Thus a coil is always partially or entirely immersed in the condensate collected in the annular coil container.

Abstract: Electrical breakdown of a gas insulator in high voltage apparatus is preved by placing an electrical insulative coating on contaminant particles in the gas insulator.

Abstract: A three-phase combined type gas insulated bus is disclosed which comprises at least one eddy current conductor for passing the eddy current caused secondarily by the current flowing in high voltage conductors, thus solving the problem of a newly-found phenomenon that the temperature of a sealed casing increases by the flow of the eddy current. This eddy current conductor is made of such a material of good electrical conductivity as aluminum or copper. Even in the case where the sealed casing is reduced in diameter to such an extent as to pose a problem of temperature increase by the eddy current flow, the eddy current is reduced or completely eliminated in the best case, so that the sealed casing can be made of a low cost soft steel.

Abstract: A gas-insulated transmission line includes a corrugated outer conductor, an inner conductor disposed within and insulated from the outer conductor by means of support insulators and an insulating gas, and a non-binding transport device for supporting and permitting movement of the inner conductor/insulating support assembly axially along the corrugated outer conductor without radial displacement and for moving without binding along corrugations of any slope less than vertical. The transport device includes two movable contacts, such as skids or rollers, supported on a common pivot lever, the pivot lever being rotatably disposed about a pivot lever axis, which pivot lever axis is in turn disposed on the periphery of a support insulator or particle trap if one is used.

Abstract: A non-binding particle trap to outer sheath contact for use in gas insulated transmission lines having a corrugated outer conductor. The non-binding feature of the contact according to the teachings of the invention is accomplished by having a lever arm rotatably attached to a particle trap by a pivot support axis disposed parallel to the direction of travel of the inner conductor/insulator/particle trap assembly.

Abstract: A particle trap to outer elongated conductor or sheath contact for gas-insulated transmission lines. The particle trap to outer sheath contact of the invention is applicable to gas-insulated transmission lines having either corrugated or non-corrugated outer sheaths. The contact of the invention includes an electrical contact disposed on a lever arm which in turn is rotatably disposed on the particle trap and biased in a direction to maintain contact between the electrical contact and the outer sheath.

Abstract: A gas-insulated transmission line includes a corrugated outer conductor, an inner conductor disposed within and insulated from the outer conductor by means of support insulators and an insulating gas, and a transport device for supporting and permitting movement of the inner conductor/insulating support assembly axially along the corrugated outer conductor without radial displacement. The transport device includes two movable contacts, such as skids or rollers, supported on a common pivot lever, the pivot lever being rotatably disposed about a pivot lever axis, which pivot lever axis is in turn disposed on the periphery of a support insulator or particle trap if one is used. The movable contacts are separated axially a distance equal to the axial distance between the peaks and valleys of the corrugations of the outer conductor and separated radially a distance equal to the radial distance between the peaks and valleys of the corrugations of the outer conductor.

Abstract: Gas insulated electrical apparatus having first and second conductors separated by an insulating support within an insulating gas environment, and particle traps disposed along the surface of the high potential conductor for trapping and inactivating foreign particles which may be present within the insulating gas medium. Several embodiments of the invention were developed which are particularly suited for vertically aligned gas insulated transmission lines. The particle traps are grooves or cavities formed into the walls of the tubular inner conductor, without extending into the hollow portion of the conductor. In other embodiments, the traps are appendages or insert flanges extending from the inner conductor, with the insulator supports contacting the appendages instead of the inner conductor.

Abstract: Electrical inductive apparatus having a tank, an insulating and cooling liquid in the tank and an electrical winding structure immersed in the liquid, the liquid having a low vapor pressure and containing contaminants derived from various sources within the tank. Filter means associated with the liquid including a liquid recirculating device for degassing, demoisturizing, and filtering insoluble particles out of the liquid, whereby the liquid is decontaminated and upgraded in a continual process.

Abstract: A transformer with a controlled flow of cooling liquid has a pressure chamber (10) which, via a hydraulic connecting member (14), is connected to a circulating pump which is included in a cooling circuit arranged outside a transformer tank (1). The connecting member (14) has a cavity (19), which is substantially formed as a rotational paraboloid, whereby an inlet tube (21), arranged at one end of said cavity and tangentially thereto, is connected to the circulating pump. One end of the member (14) is directly connected to the pressure chamber (10), whereas the other end of said member is connected to a cooling liquid collecting chamber (13) positioned outside the pressure chamber and defined by the transformer tank. (FIG. 1.

Abstract: A gas-insulated transmission line includes an outer enclosure, an inner conductor insulatably supported within the outer conductor, and an insulating gas providing electrical insulation of the inner conductor. The outer enclosure includes a cylindrical insulating pipe or sheath with a separate electrostatic shield disposed on the sheath. The pressure containing function is separated from the electrostatic shielding function, thereby minimizing the use of the more expensive electrostatic shielding material for the pressure containing function.

Abstract: This invention provides a novel high voltage gas insulated transmission line utilizing insulating supports spaced at intervals with snap-in means for supporting a continuous trapping apparatus and said trapping apparatus having perforations and cutouts to facilitate trapping of contaminating particles and system flexibility.

Abstract: A gas-insulated power transmission line includes an outer enclosure containing an inner conductor and insulating supports for insulatably supporting the inner conductor within the outer enclosure. An electrically insulating gas electrically insulates the inner conductor from the outer enclosure. The outer enclosure is comprised of two separate components; an outer sheath made of carbon steel, a grounded inner sheath disposed within the outer sheath and made of aluminum. The inner sheath, containing the inner conductor and the insulating supports, is assembled separately from the outer sheath and then the inner sheath assemblage is inserted within the outer sheath at the final field location.

Abstract: A gas insulated transmission line having radially flexible field control means for reducing the electric field along the periphery of the inner conductor at predetermined locations wherein the support insulators are located. The radially flexible field control means of the invention includes several structural variations of the inner conductor, wherein careful controlling of the length to depth of surface depressions produces regions of reduced electric field. Several embodiments of the invention dispose a flexible connector at the predetermined location along the inner conductor where the surface depressions that control the reduced electric field are located.

Abstract: A gas-filled cable having low heat emission and low power loss and being used for the transmission of high-voltage electric current. The cable includes one or more conductors which are axially spaced in position relative to each other by means of supporting insulators inside an enclosing conduit which is filled with an insulating gaseous medium. In such a cable the conduit comprises on one hand a cylindrical metal sheath of plain or low-alloy merchant steel having a carbon content of less than 0.6% and on the other hand a metal shield of non-magnetic material fixed inside the sheath and having a low specific electrical resistivity. The metal shield has a plurality of openings therethrough spaced along its length for forming particle traps.

Abstract: Electrical apparatus including an enclosure, an electrode disposed within the enclosure, and supports for insulatably supporting the electrode within the enclosure has a permanently sticky adhesive material which is disposed on the interior surface of the outer enclosure. A high-vapor-pressure sublimable material is disposed on the permanently sticky adhesive material, with the sublimable material capable of subliming away in the presence of a vacuum. The presence of the sublimable material enables the apparatus to be non-sticky during assembly and handling operations, while being rendered sticky upon commissioning of the apparatus.

Abstract: Disclosed is a process and apparatus for treating noxious gases and/or substances which are produced by virtue of an electric arc in the event of a switching operation or due to corona discharge. A gas insulated electrical apparatus is connected to a container for a cleaning solution including a volatile solvent. A conduit connects the container for the cleaning solution to the gas insulated electrical apparatus, and another conduit, including a filter apparatus, connects the gas insulated electrical apparatus to the container for the cleaning solution, for returning the cleaning solution, which has been used to wash the gas insulated electrical apparatus, to the container for the cleaning solution. Vacuum or pressure producing apparatuses may be provided for aiding in the transfer of the cleaning solution.

Abstract: A gas-insulated transmission line includes an outer sheath, an inner conductor within the outer sheath, insulating supports supporting the inner conductor within the outer sheath, and an insulating gas electrically insulating the inner conductor from the outer sheath. An apertured particle trapping electrode is disposed within the outer sheath, and the electrode has a pair of dielectric members secured at each longitudinal end thereof, with the dielectric members extending outwardly from the apertured electrode.

Abstract: A gas-insulated transmission line includes a cylindrical outer sheath, an inner conductor within the outer sheath, an insulating gas, and support insulators for insulatably supporting the inner conductor within the outer sheath. The support insulators have a pair of circumferentially spaced apart openings therein, and a wheel assembly is disposed within each of the support insulator openings. Each wheel assembly includes a rotatable wheel which extends outwardly of the support insulator opening and contacts the outer sheath. With such an arrangement, insertion or movement of the inner conductor within the outer sheath is done on wheels instead of with a sliding motion to thereby minimize the generation of conducting contamination particles.

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: A gas insulated transmission line includes an outer sheath, an inner condor within the outer sheath, insulating supports supporting the inner conductor within the outer sheath, and an insulating gas electrically insulating the inner conductor from the outer sheath. An apertured particle trapping ring is disposed within the outer sheath, and the trapping ring has a pair of dielectric members secured at each longitudinal end thereof, with the dielectric members extending outwardly from the trapping ring along an arc. A support sheet having an adhesive coating thereon is secured to the trapping ring and disposed on the outer sheath within the low field region formed between the trapping ring and the outer sheath. A conditioning method used to condition the transmission line prior to activation in service comprises applying an AC voltage to the inner conductor in a plurality of voltage-time steps, with the voltage-time steps increasing in voltage magnitude while decreasing in time duration.

Abstract: A gas-insulated transmission line includes an outer sheath, an inner conductor, insulating supports and an insulating gas. A particle-trapping ring is secured to each insulating support, and it is comprised of a central portion and two tapered end portions. The ends of the particle trapping ring have a smaller diameter than the central portion of the ring, so as to enable the use of the particle trapping ring in a curved transmission line.

Abstract: A gas insulated transmission line includes an inner conductor disposed within an outer sheath, with an insulating gas providing electrical insulation and insulating supports holding the inner conductor within the outer sheath. A particle trapping ring is disposed within but spaced apart from the outer sheath, and a flexible insulating sheet is secured to the particle trapping ring. The insulating sheet has an adhesive coating disposed thereon facing the ring, and the insulating sheet is positioned on the interior surface of the outer sheath. An insulating leaf spring, preformed along the radius of curvature of the outer sheath, is secured to the ring and is positioned between the insulating sheet and the ring, with the leaf spring loading the insulating sheet against the outer sheath. A stiffener spring is also secured to the ring and is disposed intermediate the ring and the leaf spring.

Abstract: A gas-insulated transmission line is formed of a plurality of outer sheath sections joined together lengthwise, with a conductor disposed therein. A two leg insulating spacer supports the conductor within the sheath sections, and axially extending grooves on said sheath sections receive the ends of the insulating spacer.

Abstract: A gas-insulated transmission line includes a cylindrical outer sheath, an inner conductor within the outer sheath, an insulating gas, and support insulators for insulatably supporting the inner conductor within the outer sheath. The support insulators have a pair of circumferentially spaced apart openings therein, and a wheel assembly is disposed within each of the support insulator openings. Each wheel assembly includes a rotatable wheel which extends outwardly of the support insulator opening and contacts the outer sheath. With such an arrangement, insertion or movement of the inner conductor within the outer sheath is done on wheels instead of with a sliding motion to thereby minimize the generation of conducting contamination particles.