A system for alert of energy resource outages includes: a resource monitor, disposed within radio range of resource meters that each transmit corresponding radio signals indicative of corresponding meter identifiers and current readings, configured to: determine whether the corresponding radio signals are fixed frequency or frequency hopping by scanning frequency channels for a time period and counting hits of desired meter identifiers; decode each of the one or more of the corresponding radio signals of the resource meters according to determined protocol to obtain one or more of the corresponding meter identifiers and current readings; and transmit the one or more of the corresponding meter identifiers and current readings; and a server, configured to: receive the one or more of the corresponding meter identifiers and current readings; employ the corresponding meter identifiers and current readings to detect an outage; and transmit an alert that corresponds to the outage.

A circuit breaker includes an electromechanical switch, a current sensor, a voltage sensor, and a processor. The electromechanical switch is serially connected between a line input terminal and a load output terminal of the circuit breaker, and configured to be placed in a switched-closed state or a switched-open state. The current sensor is configured to sense a magnitude of current flowing in a path between the line input and load output terminals and generate a current sense signal. The voltage sensor is configured to sense a magnitude of voltage at a point on the path between the line input and load output terminals and generate a voltage sense signal. The processor is configured to receive and process the current sense signal and the voltage sense signal to determine operational status information of the circuit breaker and determine power usage information of a load connected to the load output terminal.

During normal operation of a processor, voltage droop is likely to occur and there is, therefore, a need for techniques for rapidly and accurately detecting this droop so as to reduce the probability of circuit timing failures. The droop detector described herein uses a tap sampled delay line in which a clock signal is split along two separate paths. Each of the taps in the paths are separated by two inverter delays such that the set of samples produced represent sample values of the clock signal that are each separated by a single inverter delay without inversion of the first clock signal between the samples.

A simulation apparatus includes a database configured to a set line parameter for a system line configuring a power system; a parameter error detector configured to compare surveyed data measured in the system line and the line parameter to detect error of the line parameter; a system analysis simulator configured to perform a system analysis simulation based on the surveyed data and the line parameter; and a monitor configured to display an error detection result of the line parameter from the parameter error detector and a system analysis simulation result performed in the system analysis simulator.

A power distribution management apparatus (10) includes acquiring the amount of demand obtained by forecasting the amount of power to be used by load equipment of a customer, and the amount of power generation obtained by forecasting the amount of power to be generated by power generation equipment of the customer, and setting a plurality of voltage values as a plurality of candidates for a transmission voltage from a substation of a power distribution system, and calculating a voltage at a connection point of the load equipment of the customer and equipment of the power distribution system at each of the plurality of candidates by utilizing a difference between the demand amount and the power generation amount of each customer, and determining the transmission voltage of the substation from the plurality of candidates based on a result of the calculating.

A measurement system for an electrical installation includes at least one voltage measurement module and at least one current measurement module , which are coupled to the electrical installation, each measurement module including a sensor, a processor, a memory and a clock. A method for determining an electrical quantity in the installation allows the current measurement module to determine, for each synchronization signal received from the voltage measurement module, successive delay correction values on the basis of a main timestamp datum received from the voltage measurement module and a locally calculated timestamp datum. The successive current measurements taken by the current measurement module are timestamped by the module using the clock thereof, taking into account the delay correction values thus determined.

Determination of electrical network topology and connectivity are described herein. A zero-crossing is indicated at a time when the line voltage of a conducting wire in an electrical grid is zero. Such zero-crossings may be used to measure time within a smart grid, and to determine the connectivity of, and the electrical phase used by, particular network elements. A first meter may receive a phase angle determination (PAD) message, including zero-crossing information, sent from a second meter, hereafter called a reference meter. The first meter may compare the received zero-crossing information to its own zero-crossing information. A phase difference may be determined between the first meter and the reference meter from which the PAD message originated. The first meter may pass the PAD message to additional meters, which propagate the message through the network. Accordingly, an electrical phase used by meters within the network may be determined.

A system for testing an electrical circuit includes a handheld device, and first and second plug-in modules. The handheld device includes a first sensor that senses a current within the electrical circuit, and a second sensor that senses a voltage within the electrical circuit. The first plug-in device is connectable to a first outlet of the electrical circuit and configured to provide an identification number on the electrical circuit. The second plug-in device is connectable to a second outlet of the electrical circuit and configured to display the identification number of the first plug-in device. The handheld device receives the identification number from the first plug-in device and displays the identification number.

The present disclosure is a system and method for measuring AC residual current and DC residual current using a singular type-B residual current monitoring device. The system includes a sensor comprising two or more cores that measure residual AC current and residual DC current from two or more current carrying conductors through the cores that carry AC current and DC current. The system includes a controller that sends both an AC excitation current to the cores, as well as a DC nulling current that cancels out the DC residual current, allowing the system to then accurately measure the AC residual current. The system also includes a self-test feature that injects known quantities of both AC current and DC current through the sensor to determine if the sensor is functioning properly.

The invention relates to a method and a system for measuring imbalances in an electrical grid. The method comprises the steps of obtaining effective values and arguments of the phase voltages and currents at the fundamental frequency; calculating the effective value and the argument of the positive sequence voltages and the effective values of the negative sequence voltages; determining the active and reactive powers of each of the phases at the fundamental frequency; and calculating the value of the imbalance power vector according to the following equation:

[00001]${\stackrel{\_}{S}}_u=V_{+}.Math.\sqrt{2+2.Math..Math.{\delta }_u^2+2.Math..Math.{\delta }_A^2}.Math.(.Math.\begin{array}{c}\begin{array}{c}\frac{P_{A.Math..Math.1}}{V_{A.Math..Math.1}}.Math.\cos .Math..Math.\left({\alpha }_{+}-{\alpha }_{A.Math..Math.1}\right)+j.Math.\frac{{\stackrel{\_}{Q}}_{A.Math..Math.1}}{V_{A.Math..Math.1}}.Math.\sin .Math..Math.\left({\alpha }_{+}-{\alpha }_1\right)+\end{array}\end{array}$