Abstract: A device for detecting electrical faults internal of a liquid and gas containing power transformer. Portions of two electrically nonconducting chambers are immersed in, and each chamber has an opening into, said liquid. One of said openings permits the relatively free passage of liquid through same and the other opening contains a liquid-immersed flow-restricting orifice. A sudden change in internal transformer pressure, indicative of an internal transformer fault, creates a pressure differential between chambers because of the liquid-immersed flow-restricting orifice associated with one of said chambers and the viscous properties of said liquid. This internal failure indicating pressure differential is sensed by a suitable differential pressure sensor which, in turn, actuates power transformer fault, indicating means.

Abstract: A portable programmer is disclosed for programming and testing a multiple rate meter such as an electronic time-of-day meter system. The portable programmer includes a quartz crystal controlled seven-day clock. A time comparator is driven in synchronism with a signal which drives the clock in the time-of-day meter. When the time of the time comparator is equal to that of the programmer's timer, a compare signal is generated to switch the time in the meter to its standard time base. A programmable read-only memory in the portable programmer stores a plurality of different programs, each of which can be selectively read into the time-of-day meter. The output of the programmable read-only memory is read out and compared with the time generated by the time comparator.

Abstract: Flat internal components of an arrester are stacked longitudinally inside the insulating housing cylinder with a perimeter portion contacting the inside wall of the housing. Each component has a guide channel extending longitudinally on its perimeter portion opposite the portion in contact with the wall. A resilient rolling bias member is disposed in the channel of each component in a deformed stressed state and forces the components laterally against the wall.

Abstract: An electronic kWh meter is disclosed which measures electrical energy consumed in an electrical system. A current transformer generates an analog voltage which is proportional to a current in the electrical system. An operational amplifier has an input resistor connected across the load impedance of the electrical system and has a feedback resistor connected across the input and output of the amplifier. The input resistance of the amplifier is very small compared to the resistance of the input resistor to thereby virtually isolate the operational amplifier from the electrical system. The operational amplifier generates an output signal which is proportional to the voltage across the load impedance in the electrical system. The inphase components of the voltage and current are multiplied to provide a signal which is proportional to the instantaneous power in the system. This signal is converted to a pulse train wherein each pulse represents a quantized amount of energy consumed within the system.

Abstract: A dry well fuseholder for use with electrical apparatus containing a dielectric liquid. The holder has an outer, liquid-tight, tubular shell and a number of components inside the shell abutting coaxially in the following order: an annular fitting adapted for supporting the fuseholder on the apparatus; an insulating tube; an annular fuse terminal; another insulating tube; and an annular fuse terminal closed at one end. Glass fibers bonded together with epoxy resin are wound over the peripheral surface of the fitting-tube assembly to produce the shell. Seals are located between the fittings and shell near the joints of fittings and tubes. These seals are composed of a material which swells on contact with the dielectric liquid.

Abstract: A floating apparatus including a barge having a plurality of hydraulically actuated stabilizers for positioning the barge at a location. An hydraulically actuated, articulated boom is rotatably mounted on the barge and provided with any of a plurality of instrumentalities at the free end thereof for weeding, dredging or cleaning waterways.

Abstract: A mechanism for stripping bonded insulation from a rectangular wire. The wire is inserted into the mechanism through a pair of gripping jaws. On actuation of the mechanism the jaws are triggered to grip the wire. At least one knife is moved orthogonally to the wire surface to engage and penetrate the wire to be stripped. Then the knife is moved longitudinally along the length of the wire to strip insulation and a thin chip or sliver of metal from the wire. On the return stroke, the jaws are opened to release the stripped wire.

Abstract: A rod connector module of the type comprising an insulating housing containing a contact rod support, a receiving cone in the housing extending from the exterior toward the support, and a conductive contact rod fixed at one end to the support and extending toward the exterior along the axis of the well is provided with a layer of electrically resistive voltage stress grading material of the inside surface of the well and electrically connected to the supported end of the rod.

Abstract: A current-limiting power fuse has an indicator mechanism which includes a conductive support cup mounted on one terminal cap and containing an indicator button disposed telescopingly in the cup with an outer hermetically closed end. A spring inside the button biases the outer end face away from the support cup. The outer end of the button is held in place by a fusible indicator wire.The button is a bellows with the inner end hermetically sealed to the bottom of the support cup to isolate the fusible indicator wire from ambient gas.

Abstract: A method of welding aluminum to aluminum by thermal resistance welding, providing good electrical and mechanical characteristics. The method uses special electrodes for thermal heat that are hard and have a high electrical resistance, such as molybdenum or tungsten alloy and also relies on the aluminum oxide coating on the aluminum to provide the desired resistance heating of the aluminum to cause welding of the aluminum material. The machine disclosed provides a means for securing aluminum leads to the start and finish end of an aluminum winding automatically and simultaneously.

Abstract: A metal welding gasket secured between a cover and a container to prevent expulsion of weld material into the interior of the device being welded.

Abstract: A process for making overvoltage surge protection varistors of the zinc oxide type includes the steps of:A. sintering a varistor body at an elevated temperature of at least about 1100.degree. C; thenB. cooling the body to a temperature below about 400.degree. C; thenC. reheating the body to a temperature below about 700.degree. C; thenD. recooling the body slowly to a temperature below about 400.degree. C; and thenE. repeating at least once the steps (c) and (d)For improving the current stability of the varistor under alternating voltage stresses while preserving the level of current leakage through the varistor.

Abstract: The end caps of an electric current limiting fuse are telescopingly fitted inside the end portion of a housing tube and sealed to the inside wall in at least two spaced-apart locations to isolate an annular space between the outside cylindrical cap surface and the inside cylindrical housing tube surface. A settable adhesive fills the annular space to tightly bond the cap to the housing and to form a strong hermetic seal.Also disclosed is a method of making the seal described above, including the steps of assembling in telescoping relationship two cylindrical workpieces, providing at least two seals between the pieces to define an annular space between them, injecting a settable adhesive into the annular recess through an injection port in one of the cylinders while bleeding air out through a bleed aperture, and baking to set the adhesive.

Abstract: An electrostatic shielding arrangement for improving the initial distribution of voltage which in turn reduces the insulation stresses on disc-wound coils resulting from the application of impulse or steep wave-front voltages to such coils. Floating electrostatic shields are placed near or internal of the innermost or the innermost and outermost turns only of a disc coil section. Shields are connected together in pairs, with no more than one shield connection being made between adjacent coil sections.

Abstract: A high voltage current limiting fuse of the type including a bound silica sand filler has a fusible element provided with evenly spaced perforations along its major length. In the region of the center of the fuse, a segment of the element is provided with additional perforations. At least one of the perforations in the segment has a lead-tin alloy overlay directly adjacent its perimeter which, in conjunction with the additional perforations, lowers the low current clearing level of the fuse.

Abstract: A precut nested magnetic core having a locking outer turn. The locking turn is formed of magnetic core steel and has a pair of locking slots in one end and a single locking tab in the opposite end. The precut annular core is locked by using the second or inner slot with the locking tab while the formed annealed core is locked by using the first or outer slot with the locking tab.

Abstract: An electrical apparatus, such as a distribution transformer, having heat pipe cooling. The transformer is provided with a cover in the form of a heat pipe with an evaporator section extending from the cover into the dielectric fluid of the transformer. The top of the cover forms the condenser section of the heat pipe.

Abstract: Composition for use in making electrical insulating products such as transformer bushings comprises a mixture of cycloaliphatic epoxy resin, an anhydride curing agent, and a filler material including zirconium silicate and hydrated alumina. To provide for increased pot life of the material, the epoxy resin and a portion of the filler material are stored in one heated vessel while the anhydride curing agent and the remaining filler material are held in a separate heated vessel, the two components being mixed together prior to pouring the material into the product mold.

Abstract: An electrical apparatus, such as a distribution transformer, provided with heat pipes for cooling. The apparatus is provided with attachment wells, either extending into the cooling fluid of the apparatus or secured along the outside wall of the apparatus. Heat pipes are provided which fit into the attachment wells, with the evaporator section of the heat pipe mounted in the wells. The condenser section of the heat pipe extends away from the apparatus. Thermally conductive grease is placed in the wells to minimize the temperature drop from the wells to the evaporator section of the heat pipe.

Abstract: A metal oxide resistor of the type consisting essentially of zinc oxide and containing significant amounts of the impurities bismuth trioxide, cobalt trioxide, manganese dioxide, antimony oxide, chromic oxide, and silicon dioxide contains also significant amounts of the impurities barium oxide and boron oxide.