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US 11,237,584 B2Granted
State change detection apparatus, method, and non-transitory medium
AssigneeNEC Corporation
InventorsTakahiro Toizumi, Ryota Suzuki, Shigeru Koumoto
Life of this patent
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Abstract
A state change feature value relating to power supply current waveform data is extracted, and a transition state is detected, for a section of the waveform data, based on a magnitude of a state change feature value extracted.
Claims17
A state change detection apparatus comprising:
- a processor;
- a memory including program instructions executable by the processor;
- a receiver configured to receive a power supply current signal transmitted from a current sensor that measures the power supply current signal flowing through a power supply line with at least an electric device connected thereto;
- and
- a display apparatus,
- wherein the processor is configured execute the program instructions to:
- extract a state change feature value from an individual section of waveform data of the power supply current signal, received by the receiver from the current sensor, by calculating individual intensities of individual frequency components other than odd-order harmonic components of a power supply frequency in a frequency domain of the individual section of the waveform data of the power supply current signal and calculating the state change feature value based on a sum of the individual intensities or a sum of n-th powers of the individual intensities, where n is an integer of 2 or more;
- and
- detect a transition state for the individual section of the waveform data, based on the state change feature value extracted,
- wherein in a case where the state change feature value of the individual section of the waveform data exceeds a predetermined threshold, the processor determines that the individual section of the waveform data corresponds to the transition state and outputs a determination result to the display apparatus.
7 more elements
A computer based method of detecting a state change of an electrical device, the method comprising:
- receiving, by a receiver, a power supply current signal transmitted from a current sensor that measures the power supply current signal flowing through a power supply line with at least an electric device connected thereto;
- extracting a state change feature value from an individual section of waveform data of the power supply current signal, received by the receiver from the current sensor, by calculating individual intensities of individual frequency components other than odd-order harmonic components of a power supply frequency in a frequency domain of the individual section of the waveform data of the power supply current signal and calculating the state change feature value based on a sum of the individual intensities or a sum of n-th powers of the individual intensities, where n is an integer of 2 or more;
- and
- detecting a transition state for the individual section of the waveform data, based on the state change feature value extracted from the individual section of the waveform data, in a case where the state change feature value of the individual section of the waveform data exceeds a predetermined threshold, and determining that the individual section of the waveform data corresponds to the transition state and outputting a determination result to a display apparatus.
1 more element
A non-transitory computer readable recording medium storing therein a program, the program causing a computer to execute:
- receiving, by a receiver, a power supply current signal transmitted from a current sensor that measures the power supply current signal flowing through a power supply line with at least an electric device connected thereto;
- extracting a state change feature value from an individual section of waveform data of the power supply current signal, received by the receiver from the current sensor, by calculating individual intensities of individual frequency components other than odd-order harmonic components of a power supply frequency in a frequency domain of the individual section of the waveform data of the power supply current signal and calculating the state change feature value based on a sum of the individual intensities or a sum of n-th powers of the individual intensities, where n is an integer of 2 or more;
- and
- detecting a transition state for the individual section of the waveform data, based on the state change feature value extracted from the individual section of the waveform data, in a case where the state change feature value of the individual section of the waveform data exceeds a predetermined threshold, and determining that the individual section of the waveform data corresponds to the transition state and outputting a determination result to a display apparatus.
1 more element
Dependencies are inferred from the claim text.