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Showing papers on "Electric power published in 1969"



Patent
24 Nov 1969
TL;DR: In this paper, a method and a system where the electric power generated by a motor in the braking mode is distributed between a dynamic brake resistor and the motor supply lines in a ratio that varies as a function of the degree of power receptivity of the motor's supply lines.
Abstract: A method and a system wherein the electric power generated by a motor in the braking mode is distributed between a dynamic brake resistor and the motor supply lines in a ratio that varies as a function of the degree of power receptivity of the motor supply lines. Power receptivity is the capability of the supply lines to accept the power generated by the motor in the braking mode at a given time.

28 citations


Patent
20 May 1969
TL;DR: In this paper, a system for deicing the skin surface of aircraft is described, which comprises a power supply unit to which are connected an electrical power accumulator and a program switch.
Abstract: A system is disclosed for deicing the skin surface of aircraft and comprises a power supply unit to which are connected an electrical power accumulator and a program switch. Low inertia converters such as magnetostrictive vibrators are provided in close proximity to the skin surface and are fed from the power supply unit via key switches each having one input connected to the electrical power accumulator while its second input is connected to the program selector switch such that the switch will produce successive single or bundles of electrical pulses separated by pauses at the converters.

25 citations


Patent
15 Jul 1969
TL;DR: A portable electric automobile jack that raises and lowers the bumper of a vehicle in a smooth, continuous motion using electric power produced by the automobile but the structure of which is otherwise independent from the body of the automobile is presented in this article.
Abstract: A portable electric automobile jack that raises and lowers the bumper of a vehicle in a smooth, continuous motion using electric power produced by the automobile but the structure of which is otherwise independent from the body of the automobile, thereby enabling the jack to be disassembled, transported to other vehicles when needed and stored in the trunk of the automobile.

25 citations



Patent
24 Oct 1969
TL;DR: In this paper, a drop transfer type with a small diameter electrode which changes its dynamic characteristics when the drop short circuits the electrode to the weld pool is described. But the drop is not considered in this paper.
Abstract: Electric power supply for arc welding of the drop transfer type with a small diameter electrode which changes its dynamic characteristics when the drop short circuits the electrode to the weld pool. The supply is a DC power source having a short circuit current rate of rise greater than 100,000 amperes per second in series with an inductive choke which substantially reduces the rate of rise. Two circuits, each including a generally low resistance and/or low inductance and each including an appropriately polarized diode, are each in electrical parallel with the inductive choke. One circuit functions to increase the short circuit current rate of rise when the drop contacts the weld pool and the current starts to rise. The other absorbs the inductive energy in the choke when the short is broken and the current starts to decrease.

23 citations


Patent
31 Jan 1969
TL;DR: In this paper, the authors used SCRs and diodes to apply DC electric power from a storage battery to a winding of a reluctance-type motor to provide full and partial motoring and regenerative braking.
Abstract: Conventional SCRs and diodes are used to apply DC electric power from a storage battery to a winding of a reluctance-type motor. The circuit provides full and partial motoring and regenerative braking, freewheels the winding current at low speeds to improve motor torque, and returns winding current to the storage battery at the end of the motoring cycle to improve efficiency. Electrically powered automotive vehicles use the circuit to great advantage and the circuit also can be used in stationary industrial applications.

22 citations


Patent
07 Mar 1969
TL;DR: In this paper, a novel and veratile cleaner is composed of a cleaner body supported by a brush and an air-blower, a high-voltage power source, and an ELECTROSTATIC DUST collection unit.
Abstract: A NOVEL AND VERSATILE CLEANER IS COMPOSED OF A CLEANER BODY MOVABLY SUPPORTED ON WHEELS, A ROTATING BRUSH ENCLOSED IN A HOUSING AT THE LOWER PORTION OF THE CLEANER BODY AND ALLOWED TO CONTACT WITH THE FLOOR SURFACE AT LEAST WHILE THE CLEANER IS OPERATED, A DUST BOX DETACHABLY MOUNTED IN THE CLEANER BODY FOR RECEIVING DUST STIRRED UP FROM THE FLOOR BY THE BRUSH OPERATION, AN AIR PASSAGE EXTENDING FROM THE BRUSH PORTION OR THE DUST BOX TO THE OUTSIDE OF THE CLEANER BODY, AN ELECTRIC PRECIPITATOR, OR, AN ELECTROSTATIC DUST COLLECTING UNIT, DETACHABLY MOUNTED IN THE AIR PASSAGE, AN AIR BLOWER TO INTRODUCE AIR THROUGH SAID AIR PASSAGE, AN ELECTRIC MOTOR FOR DRIVING THE ROTATING BRUSH AND THE BLOWER, A HIGH VOLTAGE POWER SOURCE FOR SUPPLYING A HIGH VOLTAGE TO THE ELECTRIC PRECIPITATOR, AND AN ELECTRIC POWER SOURCE FOR SUPPLYING POWER TO THE HIGH VOLTAGE SOURCE AND TO THE ELECTRIC MOTOR.

20 citations


Book
15 Nov 1969

15 citations



Patent
19 May 1969
TL;DR: In this article, a composite power semiconductor is described which is adapted to avoid second breakdown and therefore provide stable operation, where the output power device and associated low-level amplifier are thermally closely coupled so that each is at all times substantially at the temperature of the other.
Abstract: A composite power semiconductor is disclosed which is adapted to avoid second breakdown and therefore provide stable operation. The composite semiconductor consists of an array of parallel-connected integrated circuits constructed in a single chip, each circuit comprising an output power device, for connection between an electric power source and a load, and one or more associated low-level control amplifiers. The effect of the thermal instability called second breakdown in such an array is to channel a disproportionate amount of electric current through the output device undergoing second breakdown, thereby increasing the temperature of the affected output device, thereby increasing the current, etc. until failure occurs. In the power semiconductor disclosed, the output power device and associated low-level amplifier are thermally closely coupled so that each is at all times substantially at the temperature of the other or bears a predetermined temperature relationship therewith, and the two are interconnected in a fashion that will produce high electrical gain. There is negative thermal feedback so that a change in power dissipation with resulting temperature change in the output device causes the low-level amplifier to alter the electric current carried by the output device. For example, an increase in temperature which will tend to cause the output device to conduct a larger amount of electric current and which will also tend to cause the low-level amplifier to conduct a larger amount of current, can have the result, because of the close thermal coupling and interconnection, of maintaining the output current substantially constant.

Patent
24 Nov 1969
TL;DR: In this paper, a method and a system where the electric power generated by a motor in the braking mode is distributed between a dynamic brake resistor and the motor supply lines in a ratio that varies as a function of the degree of power receptivity of the motor's supply lines.
Abstract: A method and a system wherein the electric power generated by a motor in the braking mode is distributed between a dynamic brake resistor and the motor supply lines in a ratio that varies as a function of the degree of power receptivity of the motor supply lines. Power receptivity is the capability of the supply lines to accept the power generated by the motor in the braking mode at a given time.

Patent
13 Oct 1969
TL;DR: In this paper, the voltage developed across the secondary windings are rectified and supplied to a deenergizing circuit, which additionally includes a holding circuit and a timing circuit.
Abstract: Overload and other excessive current conditions as regards an electric motor are sensed by current sensing loops which form the primary winding of respective transformers. The voltage developed across the secondary windings are rectified and supplied to a deenergizing circuit which additionally includes a holding circuit and a timing circuit. In the event of an overload condition, the current supply to the electric motor is interrupted and also a time delay is effected before reset occurs assuming that electric power is again available.


Journal ArticleDOI
TL;DR: In this article, the relationship between power consumption and daily temperatures is estimated using simple regression techniques and the resulting relationships permit an investigation of the consequences of temperature modification for 14 midwestern electric power production companies.
Abstract: The electric power industry has long been known to be sensitive to weather events. In particular, daily temperatures in distribution areas are known to affect electric power consumption. In this paper the relationship between power consumption and daily temperatures is estimated using simple regression techniques. The resulting relationships permit an investigation of the consequences of temperature modification for 14 midwestern electric power production companies. Comparisons between power production costs for observed and modified historical and experimentally generated temperature series suggest that changes of 3–5F in average daily temperature can reduce costs substantially. Exact differentials in production cost which can be attributed to temperature modification are presented so as to be useful in firm, industry and public policy decisions.

Journal ArticleDOI
TL;DR: In this paper, Pan-Africanism-Land and Power is discussed in the context of the culture of revolution in the Black Scholar: Vol. 1, The Culture of Revolution, pp. 36-43.
Abstract: (1969). Pan-Africanism-Land and Power. The Black Scholar: Vol. 1, The Culture of Revolution, pp. 36-43.

Proceedings ArticleDOI
20 Jan 1969
TL;DR: In this paper, the authors investigated the physics of electro-aerodynamic techniques for reducing the sonic boom and drew conclusions as to the usefulness of the proposed techniques and the electric power required for maintaining the discharge.
Abstract: : The purpose of the paper is to investigate the physics of electro-aerodynamic techniques for reducing the sonic boom and to draw conclusions as to the usefulness of the proposed techniques. An analysis of the interaction of ions and electrons of an electric discharge with neutral particles in moving air according to a one-dimensional model is described and analyzed. A simple expression for the change of total stream thrust by the electric wind mechanism is given. The electric power required for maintaining the discharge is calculated. With these basic results, the specific power requirement of the electro-aerodynamic devices proposed for deflecting the oncoming air of the supersonic transport is evaluated to be of the order of 1 watt/dyne (1/2 megawatt/pound force). For 10% change of boom intensity by electro-aerodynamic deflection of the oncoming stream thrust, a commercial supersonic transport requires of the order of thousands of megawatts of electric power. At the specific weight of 1 pound per kilowatt, clearly the electric equipment is beyond payload capability. (Author)

Journal ArticleDOI
TL;DR: In this paper, a computer program concept is described for performing an electrical analysis and a transient thermal analysis of a satellite electric power subsystem consisting of a solar array, battery, and power controls.
Abstract: A computer program concept is described for performing an electrical analysis and a transient thermal analysis of a satellite electric power subsystem consisting of a solar array, battery, and power controls. The program "flies" the power subsystem and certain thermally sensitive portions of the spacecraft through one or more complete orbits, and plots curves of voltages, currents, temperatures, and energy balance in critical parts of the power and thermal subsystems.

Patent
11 Apr 1969
TL;DR: A timepiece driven by nuclear energy is defined in this article, where the radiation of a radioactive source serves at the same time for producing the electric power for energizing a counting circuit and for control of a counting frequency or recombination frequency determining the advance of the timepiece.
Abstract: A timepiece driven by nuclear energy, wherein the radiation of a radioactive source serves at the same time for producing the electric power for energizing a counting circuit and for control of a counting frequency or recombination frequency determining the advance of the timepiece.

Patent
01 Apr 1969
TL;DR: In this paper, the authors describe how drain wires are embedded in a cablejacket by paying them into an ex-truder who dies during an attempted escape operation.
Abstract: D R A W I N G UNDULATORY DRAIN WIRES ARE EMBEDDED IN A CABLE JACKET BY PAYING THEM INTO AN EXTRUDER DIE DURING THE EXTRUSION OPERATION.

Patent
26 Jun 1969
TL;DR: In this article, a power consumption rate-monitored electric water-heating system featuring provision, in functional combination, of a water storage tank; an electric immersion heater device shrouded and extending into the lower portion of the tank; the heater shroud being open at its inner end and in communication at its outer end with the intake of a pump which is arranged to discharge through a distributor conduit into the uppermost level of tank.
Abstract: A power consumption rate-monitored electric water-heating system featuring provision, in functional combination; a water storage tank; an electric immersion heater device shrouded and extending into the lower portion of the tank; the heater shroud being open at its inner end and in communication at its outer end with the intake of a pump which is arranged to discharge through a distributor conduit into the uppermost level of the tank; a heated water takeoff connection located at the top of the tank; a cold water inlet connection located at the bottom of the tank; a waterflow-rate-regulating valve in the line between the shroud and the distributor conduit; and an electric power supply monitoring mechanism operative to limit the power consumption rate during normal periods to a prescribed maximum which is much less than the total power which may be consumed by the heating device so as to limit the total power consumption of ''''offpeak'''' periods when the power price rate is lowest. The waterflowregulating valve is arranged to be automatically responsive to temperature changes.

Journal ArticleDOI
TL;DR: In this paper, an electrical power system using a state-of-the-art photovoltaic energy conversionsource was presented on the assumption that nuclear power system technology would not be flight ready by this time period.
Abstract: Current program planning in the area of lunar surface explorationenvisions missions of increasing energy requirements and duration.During the mid 1970's it has been estimated that the electrical powerrequirements for a 3-man mission of one year duration might be in theorder of 33 000 kWh. Load profiles to support regeneration of fuelcell reactants for lunar roving vehicles and base nighttime operationsindicate potential power levels of from 30 to 100 kW. An electricalpower system using a state-of-the-art photovoltaic energy conversionsource was postulated on the assumption that nuclear power systemtechnology would not be flight ready by this time period.The process of synthesizing an overall electrical power system isdiscussed. Included are analyses and system design rationale. A rangefrom 50 to 500 volts dc is considered and the effect on weight andefficiency determined. Additional system criteria such as thermalcontrol, reliability, and emergency operation are discussed. A shred-out oftotal system weight as a function of voltage and regulation is presentedfor a 36 kWload. The impact ofload level, conditioning efficiency,transmission length, and temperature on system weight is discussed. Sensitivityivity curves depicting the effect of variations in these parameters areprovided.It is concluded that an efficiency of 80 percent or greater can beattained by matching the load profile with distribution voltage.

Patent
05 Sep 1969
TL;DR: In this paper, a power control system incorporating a silicon-controlled rectifier for selectively applying electrical power to an electroluminescent device so as to cause illumination thereof is presented.
Abstract: A power control system incorporating a silicon-controlled rectifier for selectively applying electrical power to an electroluminescent device so as to cause illumination thereof The silicon-controlled rectifier is selectively switched between its nonconducting and conducting state by a controlled bilevel signal applied to the cathode and by selectively controlling the bias values, the silicon-controlled rectifier will have a 360* conduction angle thereby applying maximum power to the electroluminescent device


Journal ArticleDOI
TL;DR: In this paper, the overall development, design, and construction features of the AEP 765-kV transmission line network are reviewed, and the overall design features of this project, to date, are reviewed.
Abstract: In 1966 the design of a 765-kV transmission line network was instigated in the AEP System. This construction project was started in 1967 and is to be completed by 1972. The overall development, design, and construction features of this project, to date, are reviewed.


Proceedings Article
01 Jan 1969
TL;DR: Modularized static AC and DC inverters and converters for aerospace electrical power conditioning systems, discussing circuit functions and performance tests as mentioned in this paper, are discussed in Section 2.1.
Abstract: Modularized static AC and DC inverters and converters for aerospace electrical power conditioning systems, discussing circuit functions and performance tests

Journal ArticleDOI
TL;DR: In this article, field studies are conducted on the condenser cooling water discharges of a thermoelectric power station water is drawn from the hypolimnion of an adjoining lake by use of an inverted skimmer.
Abstract: Field studies are conducted on the condenser cooling water discharges of a thermoelectric power station Water is drawn from the hypolimnion of an adjoining lake by use of an inverted skimmer Heat dissipation patterns are displayed for various times of the year and under different meteorological and plant loading conditions by graphic illustrations


Patent
24 Nov 1969
TL;DR: In this paper, the time for which electric power is supplied to a load is determined in accordance with a change of the charging or discharging time of a capacitor, the amount of power to be supplied to said load, and said changes are achieved by selecting variable elements by the use of pushbutton switches.
Abstract: An electric power controlling apparatus, wherein the time for which electric power is supplied to a load is determined in accordance with a change of the charging or discharging time of a capacitor, the amount of power to be supplied to said load is determined in accordance with a change of the trigger phase of a thyristor, and said changes are achieved by selecting variable elements by the use of pushbutton switches.