A load power device includes a power input; at least one power output for at least one load; and a plurality of sensors structured to sense voltage and current at the at least one power output. A processor is structured to provide real-time execution of: (a) a plurality of load identification algorithms, and (b) event detection and operating mode detection for the at least one load.

A system for sensing electrical power usage in an electrical power infrastructure of a structure. The system can include a sensing device configured to be attached to a panel of the circuit breaker box overlying at least part of the one or more main electrical power supply lines. The system also can include a calibration device configured to be electrically coupled to the electrical power infrastructure of the structure. The system further can include one or more processing modules configured to receive one or more output signals from the sensing device. The sensing device can be devoid of being electrically or physically coupled to the one or more main electrical power supply lines or the electrical power infrastructure when the sensing device is attached to the panel. Other embodiments are provided.

In one embodiment, a system and method perform a spectral analysis in a power measurement system to determine the total harmonic distortion (“THD”) in a power signal by correlating one or more THD calculation parameters to a sensed period of a voltage input signal. In at least one embodiment, the one or more THD calculation parameters are a number of samples of a voltage, current, or voltage and current components of the power signal that correlate to the sensed period. Because, for example, the period of the power signal can vary or the clock frequency can drift over time, the power measurement system correlates the number of samples with the period and, thus, varies the count of samples over which THD is calculated when the period varies. By correlating the samples with the period, the samples more closely represent a period of the sampled component of the power signal.

A power measurement apparatus includes a voltage detector, current detector, and power calculator. The voltage detector contactlessly detects an AC voltage of a conductive path to which power is supplied from an AC power source having a magnitude of AC voltage regulated to be a predetermined value, and outputs a first data signal regarding a voltage waveform of the AC voltage of the conductive path. The current detector contactlessly detects an AC current flowing through the conductive path, and outputs a second data signal regarding a current waveform of the AC current of the conductive path. A power calculator receives the first and second data signals, and calculates active power of the conductive path from a product of a second instantaneous voltage and an instantaneous current of the current waveform indicated by the second data signal. The second instantaneous voltage is generated by converting a first instantaneous voltage.

A power measurement apparatus includes a voltage detector, current detector, and power calculator. The voltage detector contactlessly detects an AC voltage of a conductive path to which power is supplied from an AC power source having a magnitude of AC voltage regulated to be a predetermined value, and outputs a first data signal regarding a voltage waveform of the AC voltage of the conductive path. The current detector contactlessly detects an AC current flowing through the conductive path, and outputs a second data signal regarding a current waveform of the AC current of the conductive path. A power calculator receives the first and second data signals, and calculates active power of the conductive path from a product of a second instantaneous voltage and an instantaneous current of the current waveform indicated by the second data signal. The second instantaneous voltage is generated by converting a first instantaneous voltage.

An arrangement includes a conductor, forming the primary side of a transformer, the secondary side being connected to a rectifier circuit. The rectifier output is connected to a voltage stabilizing circuit for an electronic unit and to a first series circuit formed by a first switching component and a first resistor. In the event of a first voltage value being reached at the first input of the voltage stabilizing circuit, the first switching component is switched to be conductive. The secondary current of the transformer flows via the first resistor to drop an electrical voltage across the first resistor. The electric current of conductor is determinable from the voltage. The use of just one transformer used both for energy generation and for current measurement makes it possible to realize a very compact and small design of a current measuring device having a simple construction.

An arrangement includes a conductor, forming the primary side of a transformer, the secondary side being connected to a rectifier circuit. The rectifier output is connected to a voltage stabilizing circuit for an electronic unit and to a first series circuit formed by a first switching component and a first resistor. In the event of a first voltage value being reached at the first input of the voltage stabilizing circuit, the first switching component is switched to be conductive. The secondary current of the transformer flows via the first resistor to drop an electrical voltage across the first resistor. The electric current of conductor is determinable from the voltage. The use of just one transformer used both for energy generation and for current measurement makes it possible to realize a very compact and small design of a current measuring device having a simple construction.

Provided are a method, an apparatus and a device for detecting abnormity of an energy metering chip. The method includes: inputting a target self-test signal to a to-be-tested component of a target energy metering chip in response to the target energy metering chip beginning to run under driving of a power signal; acquiring a first output signal from an output terminal of the to-be-tested component, and inputting the first output signal to a notch filter; inputting a second output signal from an output terminal of the notch filter to a signal correlator, and acquiring a third output signal from an output terminal of the signal correlator; and detecting a running state of the to-be-tested component based on the third output signal, to determine whether the target energy metering chip is abnormal.

Provided are a method, an apparatus and a device for detecting abnormity of an energy metering chip. The method includes: inputting a target self-test signal to a to-be-tested component of a target energy metering chip in response to the target energy metering chip beginning to run under driving of a power signal; acquiring a first output signal from an output terminal of the to-be-tested component, and inputting the first output signal to a notch filter; inputting a second output signal from an output terminal of the notch filter to a signal correlator, and acquiring a third output signal from an output terminal of the signal correlator; and detecting a running state of the to-be-tested component based on the third output signal, to determine whether the target energy metering chip is abnormal.

A three-phase power meter can monitor power on both 3-wire and 4-wire power lines. The power meter measures at least two voltages between phase conductors of the power line, and at least one voltage between a phase conductor and a neutral conductor of the power line when the neutral conductor is available. Using at least some of the measured voltages, the power meter can then operate in a first mode when coupled to a 3-wire power line to determine power on the power line based on the measured voltages, or operate in a second mode when coupled to a 4-wire power line to determine power on the power line based on the measured voltages.