Power meter with current and phase sensor
First Claim
1. A power meter, the power meter comprising:
- a voltage sensor configured to be coupled to an input line that receives input AC power from an AC power source;
at least one current and phase sensor circuit configured to be coupled to a feeder line that provides at least a portion of the input AC power from the input line to a load; and
a central metering unit coupled to the voltage sensor,wherein the voltage sensor is further configured to measure a voltage on the input line and transmit a signal related to the voltage on the input line to the central metering unit,wherein the at least one current and phase sensor circuit is further configured to measure a current of the feeder line, to calculate a voltage phase shift between a voltage on the feeder line and the voltage on the input line, and to transmit a signal related to at least one of the current of the feeder line and the voltage phase shift to the central metering unit, andwherein the central metering unit is configured to calculate power provided to the load via the feeder line based on the signal transmitted from the at least one current and phase sensor circuit.
1 Assignment
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Accused Products
Abstract
According to one aspect, embodiments of the invention provide a power meter comprising a voltage sensor, at least one current and phase sensor circuit, and a central metering unit, wherein the voltage sensor is further configured to measure a voltage on an input line and transmit a signal related to the voltage to the central metering unit, wherein the at least one current and phase sensor circuit is further configured to measure a current and a voltage phase shift of a feeder line, and to transmit a signal related to at least one of the current of the feeder line and the voltage phase shift of the feeder line to the central metering unit, and wherein the central metering unit is configured to calculate power provided to a load via the feeder line based on the signal transmitted from the at least one current and phase sensor circuit.
91 Citations
20 Claims
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1. A power meter, the power meter comprising:
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a voltage sensor configured to be coupled to an input line that receives input AC power from an AC power source; at least one current and phase sensor circuit configured to be coupled to a feeder line that provides at least a portion of the input AC power from the input line to a load; and a central metering unit coupled to the voltage sensor, wherein the voltage sensor is further configured to measure a voltage on the input line and transmit a signal related to the voltage on the input line to the central metering unit, wherein the at least one current and phase sensor circuit is further configured to measure a current of the feeder line, to calculate a voltage phase shift between a voltage on the feeder line and the voltage on the input line, and to transmit a signal related to at least one of the current of the feeder line and the voltage phase shift to the central metering unit, and wherein the central metering unit is configured to calculate power provided to the load via the feeder line based on the signal transmitted from the at least one current and phase sensor circuit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method for measuring power provided by a feeder line of an electrical system to a load, the electrical system receiving AC power from an AC source on an input line, the method comprising acts of:
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measuring, with a voltage sensor coupled to the input line, an input voltage on the input line; measuring, with a current sensor coupled to the feeder line, a current of the feeder line; calculating, with a voltage phase sensor coupled to the feeder line, a voltage phase shift between a voltage on the feeder line and the input voltage on the input line; and calculating, based on the current of the feeder line, the voltage phase shift, and the input voltage on the input line, a power level being provided to the load via the feeder line. - View Dependent Claims (14, 15, 16, 17, 18, 19)
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20. A system for measuring power provided by a feeder line of an electrical system to a load, the electrical system receiving AC power from an AC source on an input line, the system:
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a voltage sensor configured to be coupled to the input line and to measure voltage on the input line; a central metering unit coupled to the voltage sensor and configured to receive, from the voltage sensor, a signal related to the voltage on the input line; and means for measuring current of the feeder line and calculating a voltage phase shift between a voltage on the feeder line and the voltage on the input line at substantially a same location and without direct connection to a conductor within the feeder line, wherein the central metering unit is configured to calculate power provided to the load via the feeder line based on the measured current and voltage phase shift of the feeder line.
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Specification