Utility metering
First Claim
1. A variable power load detector apparatus, for use in a non-intrusive electrical load meter for metering the use of electricity supplied to a plurality of loads, the electricity supply providing an alternating voltage supply and an electrical current supply, the apparatus comprising:
- an input section arranged to receive values representative of the total instantaneous supply of at least one of electrical current and power to the plurality of loads as a function of time from the alternating voltage supply, the received values comprising a set of waveform values representative of a cyclic waveform of at least one of the electrical current and power supply, the total instantaneous supply of at least one of electrical current and power to the plurality of loads having been received without direct access to the plurality of loads;
a delta waveform generator arranged to calculate a difference between a cyclic waveform and an earlier cyclic waveform, by subtracting the respective sets of waveform values, to obtain a delta waveform;
an edge detector arranged to detect an edge or edges in the delta waveform; and
an analysis section arranged to identify at least one load based at least on information on the edge or edges detected by the edge detector.
2 Assignments
0 Petitions
Accused Products
Abstract
An apparatus has an input section arranged to receive values representative of the total instantaneous supply of electrical current as a function of time from an alternating voltage supply. Current waveforms comprising sets of values representative of the cyclic waveform of the electric current supply are obtained. A delta waveform generator calculates the difference between a current waveform and an earlier current waveform. An edge detector is arranged to detect an edge or edges in the delta waveform. An analysis section is arranged to identify at least one appliance load based at least on information on the edge or edges detected by the edge detector, and to determine the electrical energy consumed by said appliance load.
17 Citations
21 Claims
-
1. A variable power load detector apparatus, for use in a non-intrusive electrical load meter for metering the use of electricity supplied to a plurality of loads, the electricity supply providing an alternating voltage supply and an electrical current supply, the apparatus comprising:
-
an input section arranged to receive values representative of the total instantaneous supply of at least one of electrical current and power to the plurality of loads as a function of time from the alternating voltage supply, the received values comprising a set of waveform values representative of a cyclic waveform of at least one of the electrical current and power supply, the total instantaneous supply of at least one of electrical current and power to the plurality of loads having been received without direct access to the plurality of loads; a delta waveform generator arranged to calculate a difference between a cyclic waveform and an earlier cyclic waveform, by subtracting the respective sets of waveform values, to obtain a delta waveform; an edge detector arranged to detect an edge or edges in the delta waveform; and an analysis section arranged to identify at least one load based at least on information on the edge or edges detected by the edge detector. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
-
-
10. Method for detecting a variable power load, for use in non-intrusive electrical load metering for metering the use of electricity supplied to a plurality of loads, the electricity supply providing an alternating voltage supply and an electrical current supply, the method comprising:
-
receiving values representative of the total instantaneous supply of at least one of electrical current and power to the plurality of loads as a function of time from the alternating voltage supply, the received values comprising a set of waveform values representative of a cyclic waveform of at least one of the electrical current and power supply, the total instantaneous supply of at least one of electrical current and power to the plurality of loads having been received without direct access to the plurality of loads; generating a delta waveform by calculating a difference between a cyclic waveform and an earlier cyclic waveform, by subtracting the respective sets of waveform values to obtain a delta waveform; detecting an edge or edges in the delta waveform; and identifying at least one load based at least on information on the detected edge or edges. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
-
Specification