Electric power measurement system and hall effect based electric power meter for use therein
First Claim
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1. A system for measuring electrical power flowing through a power network to various loads and for detecting loss of power therefrom, the network having at least one power distribution line for feeding electrical power to a plurality of said loads through corresponding power lines, wherein each of said power lines is connected at one end thereof to an associated one of said loads and at the other end thereof to said distribution line, said system comprising:
- a measurement meter situated on each of said power lines upstream of an associated load, wherein said measurement meter further includes means for measuring the instantaneous amount of electrical power consumed by the associated load, means for totalizing the instantaneous amount over a pre-defined period of time in order to generate a totalized value indicative of the amount of power consumed by the associated load throughout the pre-defined time period, and means for transmitting said totalized value over said network upon receipt of an appropriate instruction,a master meter situated on said distribution line, wherein said master meter further includes means for measuring the total amount of instantaneous electrical power flowing therethrough to all of the associated loads, means for providing a cumulative value indicative of the total amount of power consumed by all of said associated loads throughout said predefined time period, and means for transmitting said cumulative value over said network upon receipt of an appropriate instruction, andfirst processing means situated on said network for transmitting at least one of said instructions over said network to said measurement meter and for receiving the totalized value from each of said measurement meters, andsecond processing means situated on said network for transmitting other ones of said instructions and for receiving the cumulative value from said master meter,wherein either said first or second processing means further includes means for summing all the totalized values to form an aggregate value, and means for comparing the aggregate value against the cumulative value to determine any unusual discrepancies therebetween indicative of said loss.
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Abstract
A system for measuring electric power supplied through a power distribution network and, inter alia, detecting theft of power from the network, and a remote reading Hall effect based electric power meter for use therein are both described.
150 Citations
23 Claims
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1. A system for measuring electrical power flowing through a power network to various loads and for detecting loss of power therefrom, the network having at least one power distribution line for feeding electrical power to a plurality of said loads through corresponding power lines, wherein each of said power lines is connected at one end thereof to an associated one of said loads and at the other end thereof to said distribution line, said system comprising:
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a measurement meter situated on each of said power lines upstream of an associated load, wherein said measurement meter further includes means for measuring the instantaneous amount of electrical power consumed by the associated load, means for totalizing the instantaneous amount over a pre-defined period of time in order to generate a totalized value indicative of the amount of power consumed by the associated load throughout the pre-defined time period, and means for transmitting said totalized value over said network upon receipt of an appropriate instruction, a master meter situated on said distribution line, wherein said master meter further includes means for measuring the total amount of instantaneous electrical power flowing therethrough to all of the associated loads, means for providing a cumulative value indicative of the total amount of power consumed by all of said associated loads throughout said predefined time period, and means for transmitting said cumulative value over said network upon receipt of an appropriate instruction, and first processing means situated on said network for transmitting at least one of said instructions over said network to said measurement meter and for receiving the totalized value from each of said measurement meters, and second processing means situated on said network for transmitting other ones of said instructions and for receiving the cumulative value from said master meter, wherein either said first or second processing means further includes means for summing all the totalized values to form an aggregate value, and means for comparing the aggregate value against the cumulative value to determine any unusual discrepancies therebetween indicative of said loss. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A power meter, for connection to a power line upstream of a load connected to the line, for measuring the amount of electrical power consumed by the load and for transmitting, over the power line, information indicative of the amount of totalized power consumed by the load throughout a defined period of time to a location remote therefrom, said meter comprising:
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means, for quantifying power consumed employing the use of a Hall effect sensor wherein the circuit means include means for temperature compensating in inverse proportion to any temperature characteristic of the Hall effect device and or further means, responsive to the voltage appearing on said power line and feeding said load, for providing a filtered signal that is proportional to said line voltage and contains substantially all voltage perturbations resulting from load induced consumption surges but is substantially free of any such perturbations resulting from spikes occuring in said line voltage, circuit means, responsive to said filtered signal, for generating first and second signals proportional to the values of load voltage and load current respectively, communication means connected to said power line for establishing bi-directional communication over said power line, between the meter and the location, and processing means, connected to said circuit means and said communication means and responsive to said first and second signals, for calculating a value of instantaneous power consumed by the load and for totalizing the instantaneous power value over a defined period of time to produce a totalized value, and wherein said processing means in response to an appropriate instruction appearing on said power line and received by said communication means, applies said totalized value to said communication means for transmission over said power line to said location. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23)
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Specification