SYSTEM AND METHOD FOR PHASE LOAD DISCOVERY
First Claim
1. A method of determining which phase of a three-phase power supply a load meter is connected to, the method comprising the steps of:
- transmitting a timing pulse;
receiving the timing pulse at the load meter;
determining a time delay at the load meter from receipt of the timing pulse until a landmark value of a single phase voltage of the three-phase power supply feeding the load meter; and
determining the phase of the three-phase power supply the load meter is connected to based upon the determined time delay.
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0 Petitions
Accused Products
Abstract
A system and method for determining the relative phase of each of a plurality of load meters connected to a three-phase power distribution system. The system includes a gateway that communicates information to and from each of the individual load meters. The gateway generates a timing pulse that is received by each of the load meters. Based upon the delay from the receipt of the timing pulse to the next zero crossing of the single phase power supply received by the meter, the utility can determine the phase of the individual meter. The system can include a feeder meter connected to each phase of the electrical supply system to determine the energy consumption for each of the meters connected to a specific phase. The utility can compare the energy consumption information from the feeder meter to all of the load meters connected to the same phase to determine whether any energy theft is occurring.
100 Citations
21 Claims
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1. A method of determining which phase of a three-phase power supply a load meter is connected to, the method comprising the steps of:
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transmitting a timing pulse; receiving the timing pulse at the load meter; determining a time delay at the load meter from receipt of the timing pulse until a landmark value of a single phase voltage of the three-phase power supply feeding the load meter; and determining the phase of the three-phase power supply the load meter is connected to based upon the determined time delay. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method of monitoring the load on a three-phase power supply that provides power to a plurality of load meters each connected to one of three supply lines of the power distribution system, wherein each of the supply lines carries a different one of the three voltage phases, the method comprising the steps of:
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transmitting a timing pulse; receiving the timing pulse at each of the plurality of load meters; determining a time delay at each of the load meters, the time delay being a measured time from the receipt of the timing pulse until a landmark value of the single phase voltage received by the load meter; and determining the phase of the three-phase power supply each of the load meters is connected to based upon the time delay determined by each of the load meters. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15, 16)
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17. A method of determining which phase of a three-phase power supply each of a plurality of load meters are connected to, the method comprising the steps of:
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transmitting a wireless timing pulse; receiving the timing pulse at each of the plurality of load meters; determining a time delay at each of the load meters, the time delay being the measured time from the receipt of the timing pulse until the next zero crossing of the single phase voltage feeding the load meter; transmitting the determined time delay to an end server; and grouping each of the load meters into one of three phases based upon the similarity of the determined time delays received at the end server from each of the load meters. - View Dependent Claims (18, 19)
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20. A system for determining the load on each phase of a three-phase power supply, comprising:
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a plurality of load meters each connected to one phase of the three-phase power supply; a wireless transmission device positioned to generate a wireless timing pulse received by each of the plurality of load meters, wherein each of the plurality of load meters is operable to determine a time delay from receipt of the timing pulse until a first zero crossing of the single phase voltage, the load meter further including a transmission device to wirelessly transmit the determined time delay; and an end server operable to receive the determined time delay from each of the load meters and group each of the load meters into one of the three phases based upon the determined time delay from each meter. - View Dependent Claims (21)
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Specification