A merging unit including one or more input interfaces for receiving a plurality of input signals wherein one or more voltages and/or one or more currents measured by a plurality of measurement devices, digital processing means and one or more output interfaces for outputting an output signal. The digital processing means are configured to high-pass filter, using one or more digital filters, at least one of the plurality of input signals for lowering a time constant associated with the at least one of the one or more input signals to match a target time constant or for raising a high-pass cut-off frequency associated with the at least one of the one or more input signals to match a target high-pass cut-off frequency and to merge, following the high-pass filtering, the plurality of input signals into the output signal having a pre-defined output format.

A merging unit including one or more input interfaces for receiving a plurality of input signals wherein one or more voltages and/or one or more currents measured by a plurality of measurement devices, digital processing means and one or more output interfaces for outputting an output signal. The digital processing means are configured to high-pass filter, using one or more digital filters, at least one of the plurality of input signals for lowering a time constant associated with the at least one of the one or more input signals to match a target time constant or for raising a high-pass cut-off frequency associated with the at least one of the one or more input signals to match a target high-pass cut-off frequency and to merge, following the high-pass filtering, the plurality of input signals into the output signal having a pre-defined output format.

A voltage adjustment apparatus, a chip, a power source, and an electronic device. The apparatus comprises: a voltage input module, used for receiving an input voltage; a current determining module, electrically connected to the voltage input module and used for determining an adjustment current on the basis of the input voltage and a load current; a control module, electrically connected to the current determining module and used for outputting a control signal on the basis of the adjustment current; and a voltage output module, electrically connected to the voltage input module, the current determining module, and the control module, and being used for outputting a target voltage on the basis of the control signal and the input voltage.

A partial discharge (PD) detection system includes a node including a sensor configured to capacitively couple to a shield layer of a cable of an electric power line. The sensor is configured to collect, from the cable, sensor data indicative of an alternating-current (AC) electrical signal in the cable. The system further includes a high-pass filter configured to filter out low-frequency signals from the sensor data, and processing circuitry configured to detect, based on the filtered sensor data, a PD event at a location on the cable that is local to the sensor.

A method for monitoring a three-phase network that is operated in a compensated manner for a tuning change of the arc suppression coil. Reference network parameters and a reference network frequency are determined for a tuned state, and a current network frequency is determined for a current state. A reference characteristic variable, which is proportional to a displacement voltage, is determined for the current network frequency using the reference network parameters, and a current characteristic variable, which is proportional to a displacement voltage, is determined at the current network frequency. A differential variable is determined from the reference characteristic variable and the current characteristic variable, from which, with a predetermined threshold value being exceeded, a tuning change is identified and changed network parameters are determined.

A system includes a processor operatively coupled to memory. The processor performs operations that include obtaining electrical measurements of a power system. The processor determines a scaled energy value of a first set of the electrical measurements that are scaled with respect to a second set of electrical measurements. The processor determines that a potential ringdown event occurred by comparing the scaled energy value to a threshold energy value. The processor determines that the potential ringdown event is a confirmed ringdown event by comparing a scaled error value to a threshold error value. The processor generates one or more mode estimates from the confirmed ringdown event.

Certain aspects and features include a system and method for monitoring the operational status of assets in an electric power distribution system. For example, an asset monitoring system identifies a zone of operation for an asset under evaluation. The asset monitoring application identifies meters connected to transformers in the zone of operation and obtains meter voltages for the meters over multiple intervals. The asset monitoring application determines a primary voltage for at least one transformer based on at least one meter voltage. The asset monitoring application uses the primary voltage in a power flow calculation to estimate an operational setting for the asset. The asset monitoring application compares the voltages from the power flow analysis using the estimated operational setting and the voltages from the meter voltages across multiple time intervals. Based on the comparison, the asset monitoring application determines an operational status of the asset.

A current measurement apparatus includes: a current sensing element generating a signal according to a current to be measured; a current measurement means measuring an amount of the current to be measured from the signal outputted from the current sensing element; a communication unit receiving system information from at least one upper-level controller; a correction amount calculation unit calculating information on an amount of a corrected current based on the amount of the current to be measured and the system information; and a measurement operation unit outputting the information on the amount of the corrected current to the at least one upper-level controller.

A method of enhanced backward/forward sweep based power flow analysis is described. The method can include performing a backward sweep to determine first branch currents of a radial distribution network based on nodal voltages determined at a last iteration. The radial distribution network can include nodes and branches that are sequentially numbered and belong to different layers. A forward sweep is determined to determine first nodal voltages of the radial distribution network based on the first branch currents. Second branch currents of the radial distribution network are determined based on the first nodal voltages. The second branch current of the respective node is a sum of a nodal injection current of the respective node that is updated based on the first nodal voltage of the respective node, and if available, the first branch currents of branches emanating from the respective node.

Provided is a tool wear monitoring device configured to input a plurality of pieces of image data captured with a microscope camera while changing an angle, and to monitor tool wear. The tool wear monitoring device includes a data analysis unit configured to analyze image data. The data analysis unit binarizes the plurality of pieces of image data captured while changing an angle, extracts data in which a worn region has a maximum area among the plurality of pieces of image data, and analyzes the amount of wear from the extracted data with the maximum area.