The disclosure describes techniques for providing meter-to-transformer connectivity information and/or correction, using voltage-correlation, distance, and/or address data. In an example, a meter generates a time-series of voltage-changes. Transformers geographically close enough to the meter are assigned a time-series of voltage-changes. Pearson's Correlation Coefficient (PCC) values of the meter with respect to individual transformers are determined. A reference PCC value of the meter is set to be an average of a largest and a second largest PCC value from among the PCC values of the meter. Voltage-correlation confidence rating (VCCR) values for the meter with respect to each transformer that is within the threshold distance from the meter are calculated using the PCC. Based at least in part on the VCCR values for the meter with respect to each transformer that is within the threshold distance from that meter, a probability of the meter being connected to each transformer is determined.

A current sensing circuit for sensing an intermittent current having a Zero Current Period includes: an amperometric transformer having a primary winding for the current to be sensed to flow therethrough and a secondary winding, a sensing resistor coupled to the secondary winding of the transformer, an offset capacitor coupled with sensing resistor between the sensing resistor and ground, and a switch element acting across the coupling of the sensing resistor and the offset capacitor, the switch element being electrically conductive during the zero current period or a fraction thereof.

An abnormality diagnosis apparatus performs: a first step of diagnosing a shortage of precharge voltage or a short-circuit failure between electrodes of a capacitor based on a detection value of a precharge voltage detection circuit in a state where a first relay and a second relay are turned off, and a precharge circuit is operated; a second step of diagnosing, after a normal determination in the first step, a disconnection failure of a precharge path based on the detection value of the precharge voltage detection circuit or a detection value of an inter-relay voltage detection circuit in a state where the first relay and the second relay are turned off, and the precharge circuit is not operated; and a relay failure diagnosis step of diagnosing, after a normal determination in the second step, a short-circuit failure and an open failure of the first relay or the second relay.

In a meter for performing a measurement of an electrical parameter, an output from a sensor is sampled to produce at least one sample, and an iterative method is performed comprising: producing further samples; holding in memory a stored array of samples comprising the at least one sample and each of the further samples from each iteration; determining a measure of statistical variability of a mean for the respective iteration from a measure of statistical variability and from the number of samples used to generate the measure of statistical variability; comparing the measure of statistical variability of the mean with a pre-determined threshold; and generating an electrical signal indicating a state of the measurement if the measure of statistical variability of the mean of the samples taken during the measurement is less than or equal to the pre-determined threshold.

A method for monitoring a bank of ultracapacitors configured to power an alternating current (AC) pitch motor of a pitch system in a wind turbine is provided. The method includes obtaining, by one or more control devices, data indicative of a voltage associated with the bank of ultracapacitors. The method includes conducting, by the one or more control devices, a test operation of the bank of ultracapacitors at predetermined intervals of time to determine a capacitance associated with the bank of ultracapacitors. The method further includes performing, by the one or more control devices, one or more control actions based, at least in part, on the capacitance or the data indicative of the voltage.

A device includes an electronic circuit and a voltage-controlled oscillator configured to receive information representative of a power supply voltage of the device. The voltage-controlled oscillator is coupled to the electronic circuit. A first counter is configured to count pulses supplied by the voltage-controlled oscillator and a second counter is configured to count pulses of a clock signal. The device is configured to estimate an average power of the electronic circuit based on the pulses counted by the first counter.

Techniques for determining aspects of a topology of a smart grid are described herein, and particularly for determining if one or more electrical meters are connected to the same transformer. In one example, time-stamped voltage data is collected from at least two meters. The voltage data may indicate a slight transient change in voltage resulting from a consumer turning on or off an electrical load. In particular, the slight voltage changes may be sensed by all meters attached to a same transformer based on electrical load changes by any one of the customers on the same transformer. Using the time-stamped voltage data, a time-series of voltage-changes may be generated for each electrical meter. A correlation between the time-series of voltage-changes of pairs of meters may be calculated, to thereby determine an affinity between the meters, and particularly if they are connected to a same transformer.

A system includes a two-conductor loop in which the loop current or current signal is controlled by a loop current controller to be proportional to a signal output from a sensor. The system further includes energy harvesting circuitry in electrical connection with the two-conductor loop which includes a second current controller in parallel electrical connection with the loop current controller and a power converter in electrical connection with the second current controller. The second current controls a portion of current drawn from the two-conductor loop and delivered to the power converter from an output port thereof. The portion of the current drawn from the two-conductor loop is returned to the loop current controller from the energy harvesting circuit. Noise in the portion of the current drawn from the two-conductor loop by the second current controller is controlled by the second current controller to be below a predetermined threshold.

A method for analyzing power quality events in an electrical system includes processing electrical measurement data from or derived from energy-related signals captured by at least one of a plurality of metering devices in the electrical system to generate or update a plurality of dynamic tolerance curves. Each of the plurality of dynamic tolerance curves characterizes a response characteristic of the electrical system at a respective metering point of a plurality of metering points in the electrical system. Power quality data from the plurality of dynamic tolerance curves is selectively aggregated to analyze power quality events in the electrical system.

The present disclosure provides an alternating current (AC)/direct current (DC) voltage detection circuit, which includes a rising edge trigger circuit and a detection and output circuit connected to an output terminal of the rising edge trigger circuit. When the operating voltage is higher than the preset voltage, the determination circuit activates the detection and output circuit to detect the change of the operating voltage and the target flip.