Abstract: A Programmable Demand Register (PDR.TM.) which has a multi-function externally programmable time based measuring system is disclosed. An optical communication port is provided for bidirectional communication of data, said meter being capable of recordation of energy consumption in several different modes, according to the decision of the meter programmer. Meter programming is accomplished by means of any one of three separate devices, namely a Programmer/Reader (P/R) which is a sophisticated computerized device fully adapted to reprogram the PDR.TM.
August 12, 1982
Date of Patent:
September 17, 1985
Duncan Electric Company, Inc.
Robert E. Brandyberry, Mark M. Forbes, David D. Gloyeski, Russell F. Greafnitz, Glen R. Phillips, Robert L. Straw, Kevin L. Stricker, William A. Szabela, Richard R. Webeck, Glenn A. Mayfield, William L. Vollmer
Abstract: A Power Transducer is disclosed, such as a watt-watthour Transducer, having a dual multiplier circuit receiving inputs from a power source to be monitored and a triangle wave generator. The circuit includes first and second transformers which separately receive voltage and current inputs representative of the power line to be monitored. The first transformer provides dual outputs of opposite polarity which are isolated and scaled replicas of the input voltage. The dual outputs are separately channeled through half-wave multiplier paths, to a comparator in each path, which comparators receive the input from the triangle wave generator to produce a pulse modulated output for control of a switch in each path, which switches also receive the current signal from the second transformer. The outputs from the switches have pulse heights proportional to the instantaneous value of the current and pulse widths proportional to the incoming voltage with the integral being equal to the product of the voltage and current.
Abstract: Transducers of the average responding RMS indicating type are disclosed that are particularly useful for monitoring currents and voltages in a power distribution network. The transducer includes transformer, inductively compensated voltage divider, active filter and output amplifier circuits electrically connected to provide a transducer having excellent long term transducer stability so that the transducer requires no calibration, and a highly accurate readout over a wide temperature range.
Abstract: A combined laser beam shutter and beam "on-off" indicator is disclosed. A rotatable shutter pin is mounted in a beam interrupting positon with the shutter having an aperture thereon which, when the pin is rotated to the proper position, permits passage of the light therethrough. The shutter pin is adapted, when in closed position, to reflect visible light caused by the laser to a position for observation thereby indicating that the beam is "on".
Abstract: A transformer mounting assembly is disclosed for mounting a plurality of current transformers on a wire. A pair of parallel mounting plates are positioned normal to one another with one of the mounting plates having first and second current transformers mounted on the same side of the mounting plate at the opposite end portions and the engaging mid portions of the mounting plates having a third current transformer mounted thereat with the third current transformer being at the other side of the mounting plate from that of the first and second current transformers. The opposite end portions of the other mounting plate have clamps mounted thereon with the clamps being contoured to releasably clamp the assembly to a neutral wire with the other mounting plate extending along the wire.
Abstract: A heat sensitive abnormal current condition detecting and indicating device associated with a watthour meter indicates that a possibly damaging surge has been experienced by the meter. The abnormal condition detecting and indicating device includes indicator means retained in normal position by a heat sensitive material, such as solder, with the indicator means being biased to move from the normal position to an abnormal condition position should the conductor being monitored experience a heat rise sufficient to soften the heat sensitive material and release the indicator means.
Abstract: Lightning protection is provided by an electronic valve molded mainly of silicon carbide powder. The manufacturing cost and high reject rate of previous ceramic bonding is greatly reduced by bonding with epoxy resin, the mixture being pressure molded. The surface-tracking characteristic of epoxy resin is rendered harmless by covering the periphery of the molded piece with insulation and by inclusion of alumina powder in the mix. The insulating sleeve is extended to provide a hood preventing harmful migration of an ionized arcing path.
Abstract: A heat sensitive fault detecting and indicating system and method for a watthour meter is disclosed herein. The illustrated watthour meter includes a potential stator and a current stator both of which are mounted on a frame assembly, the assembly also having mounted thereon one or more permanent magnets and a rotatable disk assembly with disk rotation being recorded on the recording dials of a register assembly visible through the enclosing glass cover of the meter. The current stator includes a pair of current coils which coils have a heat sensitive fault detecting and indicating device associated therewith. The heat sensitive fault detecting and indicating device illustrated includes a layer of low melting point metal, such as tin, for example, which layer is covered by a sheath, such as a plastic sheath, for example, with predetermined portions of the sheath being thinned, as by embossing, for example, with a predetermined symbol or other indicia.