Abstract: A programmable fault detecting relay for fluid cooled electrical apparatus utilizes a pressure transducer to provide an electrical input to an electronic discriminating circuit. The circuit discriminates between through fault pressures and internal fault pressures and provides an output upon the occurrence of an internal pressure fault.

Abstract: A sound attenuator for transformers comprises a rigid plate fixedly attached to a resilient mass. The sound attenuator is attached to the transformer outer wall in the vicinity of highest sound production. The characteristics of the metal plate and the resilient mass are chosen to produce acoustical radiation out of phase with the noise emitted at the transformer wall surface.

Abstract: Improved three component insulating coatings for both wet solvent and dry electrostatic application to transformer wires contain an increased epoxy resin concentration and a decreased amount of polyvinyl acetal and phenol aldehyde resins. The increased epoxy content gives substantially improved coatings with no adverse dissipation and hydrolytic effects. The epoxy constituent can range from 30-60 percent by weight providing the ratio of the polyvinyl acetal to phenol aldehyde is kept within the range of from 1 to 1 to 2 to 1.

Abstract: High voltage bushings for use within SF.sub.6 circuit breakers are provided with a tandem arrangement of an outer acid resistant gasket and an inner gas impervious gasket to prevent contact between the bushing oil and the SF.sub.6 gas.

Abstract: A vacuum shield support ring for a high voltage vacuum interrupter contains a plurality of quasi rectangular openings equidistantly spaced around the ring to allow for the upward flow of glass during the vacuum interrupter envelope forming process. Complete embedment of the openings substantially reduces the occurrence of ionized particles in the finished vacuum interrupter.

Abstract: A watt-hour meter including a time switch and clock dial is provided with a key-operated rotary reset actuator mounted on the cover, in which a key is utilized to allow the rotary reset actuator to be extended into the meter behind the cover in contact with the reset member of time switch clock dial for resetting of such clock dial.

Abstract: A surge voltage lightning arrester ground lead disconnector utilizes a refractory metal coating on the explosive cartridge to provide a thermal delay to the arcing that occurs during disconnector operation. The thermal delay insures the explosion of the cartridge and promotes venting the arrester housing.

Abstract: A bubble deflector for a vapor-cooled transformer comprises an insulating member, such as pressboard, which is placed under the upper yoke member of the transformer core to deflect vapor bubbles away from the bottom area of the upper yoke member of such core.

Abstract: A connector module for loadbreak operation having an insulating housing and a switch insert. The insert includes a container with a major portion of uniform diameter and a configuration such that the diameter does not increase from its outer end to its inner end, to permit the insert to be installed in the finished housing. Inside the container is a snuffer-contact assembly which has a bore lined with an ablative material. A bore contact having a gas port is attached to a snuffer tube of the assembly and has fixed to it a piston adapter for driving the snuffer-contact assembly toward the open end of the container tube in response to gas generated by arcing inside the bore. Resilient sliding contact means are fixed to the piston and press against the inside wall of the container tube to establish continuous electrical contact with it even while the piston is moving.

Abstract: The invention is a hermetically sealed motor driven pump cooled by a liquid dielectric coolant. The pump has an impeller housing, a motor housing containing a liquid dielectric cooling fluid of the same type as the pumped fluid, and a sealing means between the impeller housing and the motor housing to prevent flow of the pumped fluid from the impeller housing to the motor housing. An electric motor is contained in the motor housing with a shaft extending into the impeller housing and an impeller attached to the shaft inside the impeller housing. A hollow conduit from the discharge port of the impeller housing to the motor housing is used to create a fluid pressure inside the motor housing equal to the pressure of the pumped fluid at the discharge port to increase the heat dissipation. Particles in the pumped fluid are effectively excluded from contacting the bearings. The hollow conduit may contain a filter or desiccant and the motor housing may contain a magnetic plug.

Abstract: Apparatus and method of compensating for a shift in the phase of the current applied to a current transformer terminated in a low impedance operational amplifier. The operational amplifier phase response is altered to minimize the phase angle between the transformer current and the amplifier output voltage to thus provide an output voltage directly proportional to the transformer current.

Abstract: A self-locking and aligning terminal member for affixing electrical wires to a device such as a coil, comprising a smooth surfaced rod bent approximately 180.degree. upon itself to provide a pair of generally parallel leg sections extending from the bend and with each terminating in an outward projecting flare forming barbs to lock the member within a receiving recess. The parallel leg sections of the terminal member are provided with a laterally bowed section adjacent the bend for receiving the electrical conducting wires adjoined thereby, and an outwardly bowed section adjacent the outward projecting flare forming barbs for positioning the terminal member within a receiving recess.

Abstract: Sinterless zinc oxide varistor devices are prepared in one embodiment by flame spraying premixed zinc oxide and additive metal oxide powders onto a refractory substrate. The coated substrate is then treated by an abrasive removal process to form a trimmable resistor. A further embodiment comprises the use of a plasma spray process wherein carbonates and nitrates of the varistor constituents are oxidized in situ by entrainment within an oxygen gas stream and directing the plasma upon a rotating substrate. Ultra pure zinc oxide varistor devices having excellent electrical properties can be prepared in this manner.

Abstract: The invention is an improved heat exchanger of the type used for cooling electrical apparatus and having a plurality of headers and interconnecting cooling tubes arranged perpendicular to the headers and includes at least one fan to direct air over a portion of the cooling tubes. The improvement in thermal rating is obtained by the use of air deflectors to redirect the airflow over an additional portion of the cooling tubes.

Abstract: A meter cover (housing) mounted mechanism incorporating a combination key operated tamper resistant security lock, externally controllable meter reset actuator and meter access hatch.

Abstract: A positive acting magnetic clutch and brake assembly characterized by including a movable, magnetic member provided with two sets of detents arranged respectively on its opposing outer surfaces. The member is alternately shiftable into either a brake position, in engagement with a braking post mounted to engage one of the sets of detents, or to a drive position in which a reciprocally mounted mechanical dog is engaged with the other set of detents in a non-slip driving coupling between the magnetic member and a clutch assembly. A reciprocal mounting arrangement for the dog enables the magnetic member to be moved into driving contact with the clutch assembly before the dog becomes positively engaged with any of the detents on the magnetic member.

Abstract: A noise suppressor for a heat exchanger comprises an air duct having a larger inlet than outlet encompassing the cooling fan to provide an antiresonant space to incoming air. The noise suppressor effectively reduces the noise level emanating from supplementary air-cooled transformers mounted on electric locomotive undercarriages.

Abstract: In a power system, a time-of-day demand meter of the type having a programmable control circuit for generating a control signal at prescribed intervals to enable a demand logic circuit to control the engagement of a demand register of the meter includes apparatus responsive to the control signal to generate an end of interval signal to disengage the demand register at a specified time as selected by the apparatus to control the length of demand intervals during which the consumption of electrical energy is measured.

Abstract: An automatic gain control circuit and system for using same provides linear attenuation response to input data signals of multiplexed frequencies of high and low signal amplitudes to eliminate frequency intermodulation products generated by the data signals of high amplitude from interfering with the reception of the proper data signals by a tuned receiver communicating with the automatic gain control circuit.

Abstract: The invention provides a circuit for determining excessive energy magnitudes or rates of rise of energy in metal oxide varistor devices. The circuit further provides a series of low voltage control pulses for energizing a high voltage pulse generator. The output of the high voltage pulse generator triggers a protective air gap for bypassing the metal oxide varistor device. One application for the invention is for use within a series capacitor protective circuit.