Abstract: An oil sampling system for an electrical power device in which the oil flows through the sampling device in a closed loop with the oil containing apparatus of the electrical power device. Oil is taken in from an active region near the top of the oil containing apparatus and returned to a lower region thereof. This assures that the oil sample is representative of the oil in the system. For the case of a power transformer, the oil flow is by cooling with gravity assistance. For the case of a pumped system, such as a load tap changer, the oil flow is forced. The sampling procedure begins with connecting the sampling device in the closed loop. Oil is then passed through the sampling device until bubble free. The sampling device is then removed for analysis. The procedure does not need a flush operation or a flush container.

Abstract: An oil sampling system for an electrical power device in which the oil flows through the sampling device in a closed loop with the oil containing apparatus of the electrical power device. Oil is taken in from an active region near the top of the oil containing apparatus and returned to a lower region thereof. This assures that the oil sample is representative of the oil in the system. For the case of a power transformer, the oil flow is by cooling with gravity assistance. For the case of a pumped system, such as a load tap changer, the oil flow is forced. The sampling procedure begins with connecting the sampling device in the closed loop. Oil is then passed through the sampling device until bubble free. The sampling device is then removed for analysis. The procedure does not need a flush operation or a flush container.

Abstract: A system that controls nitrogen pressure in the ullage of a power transformer that has its windings submerged in oil. The pressure is controlled in a narrow range of approximately 0.5 psi to approximately 2.0 psi. A nitrogen generator supplies the nitrogen to a reservoir from which it is distributed to the ullage as well as to accessories such as a load tap changer or a control box. A temperature regulator is provided for substation installations that are located in climates with wide ambient temperature variations to control the pressure of the generated nitrogen in an acceptable range.

Abstract: An integral oil filter-pump system for an electric power device which involves a cabinet having an oil-filled compartment for containing the power device, as well as a circulation pump for circulating oil through the system, including the compartment for containing the power device.

Abstract: A maintenance free dehydrating breather apparatus for equipment such as oil cooled transformers and the like includes a cap and vessel enclosing a container for desiccant. A heater is mounted within the container in contact with the desiccant. The apparatus is connected through the cap to the equipment being supplied with dehydrated air. When the equipment requires dehydrated air, it draws air in through a vent valve in the vessel and thence through walls of the container and the desiccant. When the equipment expels air, the air is passed out through the vent valve, which otherwise normally seals off the interior of the vessel from the moisture in outside air. At selected intervals, for a selected period of time, a heater within the container is supplied with electrical power to heat the desiccant to drive off the moisture therefrom, which condenses on the walls of the vessel and flows to the bottom of the vessel where it is discharged through the vent valve.

Abstract: A switch for use in transformer tap changing is modular in design, having standardized fixed contact units mounted in alignment on a base. Each contact unit has an electrical contact embedded in an insulating body, with a hollow bore formed through the insulating body and the embedded electrical contact. A cylindrical movable contactor having spaced contact bands is mounted on a shaft to be driven through the hollow bores of the fixed contact units between positions at which its contact bands engage the electrical contacts within adjacent fixed contact units. The electrical contacts of the fixed contact units are connected to different taps of the transformer to allow the transformer turns ratio to be adjusted by changing the position of the movable contactor. The drive shaft is connected by a mechanism to a handle mounted outside the tank of the transformer that can be operated to move the movable contact a selected distance to change the tap connections to the transformer.

Abstract: A high temperature insulation for liquid-filled transformers. This invention is a composite sheet material composed of a substrate saturated with a thermally stable polymeric resin that provides a micro-porous structure. This structure allows dielectric fluid to saturate the electrical insulation material. The insulation materials have a low moisture absorption, and do not generate water when aged during the life of the transformer. The invention improves transformer life expectancy with a cost effective alternate electrical sheet insulation material. This material has better heat aged electrical properties than cellulose, which is presently the most common insulator for liquid filled transformers.

Abstract: A molded buswork and method of manufacturing the buswork, including a conductive T-shaped member having openings at the ends, insulated cables having the insulation at the ends of the cables stripped away to expose the ends of the conductors, an individual exposed conductor being crimped in each open end of the conductive member, the conductive member being supported in a cavity mold by the cables, the cavity mold being filled with a thermal-setting silicone rubber, the silicone rubber curing in the mold to encapsulate and bond to the conductive member, the exposed ends of the conductors, and the insulation on each cable.

Abstract: In a modular solid state detector of the type including a scintillator and diodes for converting x-ray flux to a measurable electrical signal, the diodes are mounted out of the path of incident x-radiation to minimize noise and to limit degradation. The resulting configuration reduces efficiency because the active diode area is limited and the length of the light path between the scintillator and diode is increased. In order to compensate for that reduction in efficiency, optical potting material is used to join the scintillator to the diodes in order to minimize light attenuation between those elements. In addition, the outer surface of the cured optical potting material is coated with a thin specular layer of silver to keep the light within the optical potting material and thus most efficiently reflected from the scintillator to the diode.