There are provided a method and device for detecting a zero phase component. The device for detecting a zero phase component includes a meter chip of a sequential sampling method, a data acquiring unit configured to acquire sequential data on a plurality of phases from the meter chip, and a zero phase current value calculating unit configured to calculate an instantaneous current value for fault detection by summing instantaneous current values for each phase from the acquired sequential data, and calculate a zero phase current value using the calculated instantaneous current value for fault detection.

There are provided a method and device for detecting a zero phase component. The device for detecting a zero phase component includes a meter chip of a sequential sampling method, a data acquiring unit configured to acquire sequential data on a plurality of phases from the meter chip, and a zero phase current value calculating unit configured to calculate an instantaneous current value for fault detection by summing instantaneous current values for each phase from the acquired sequential data, and calculate a zero phase current value using the calculated instantaneous current value for fault detection.

A motor drive is provided with integrated frequency response analysis tools for generating drive performance metrics that are independent of motion profile and tuning. The metrics are broadly applicable to a wide range of applications, tunings, and load types, and can be used to fairly compare performance across different drives models and assist in drive selection. The frequency analysis tools include a transformation algorithm that reduces or eliminates spectral leakages, a signal generation component that scales the test input signal as a function of frequency avoid saturation based on defined limits of the controlled system, and a phase unwrapping algorithm that correctly unwraps the phase of open-loop and closed-loop response curves. The frequency response analysis tools yield an open-loop response, a closed-loop response, a tracking error response, and a disturbance rejection response, which are used to derive performance metrics for the drive.

A method for analyzing quality of electrical energy in a three-phase electric network, the method including: measuring a set of electrical magnitudes, the set including one electrical magnitude per phase; forming a space vector from an instantaneous three-dimensional transformation of the set of measured electrical magnitudes; and determining a set including at least one parameter representative of the quality of the electrical energy in the three-phase electric network, according to the space vector.

A method for analyzing quality of electrical energy in a three-phase electric network, the method including: measuring a set of electrical magnitudes, the set including one electrical magnitude per phase; forming a space vector from an instantaneous three-dimensional transformation of the set of measured electrical magnitudes; and determining a set including at least one parameter representative of the quality of the electrical energy in the three-phase electric network, according to the space vector.

The present disclosure is a system for monitoring power that has a unified polyphase distribution transformer monitoring (PDTM) device that interfaces with at least three electrical conductors electrically connected to a transformer. In addition, the PDTM device measures a current and a voltage of each of the three electrical conductors. Additionally, the system has logic that calculates values indicative of power corresponding to the transformer based upon the currents and the voltages measured and transmit data indicative of the calculated values.

The present disclosure is a system for monitoring power that has a unified polyphase distribution transformer monitoring (PDTM) device that interfaces with at least three electrical conductors electrically connected to a transformer. In addition, the PDTM device measures a current and a voltage of each of the three electrical conductors. Additionally, the system has logic that calculates values indicative of power corresponding to the transformer based upon the currents and the voltages measured and transmit data indicative of the calculated values.

A monitoring apparatus is connected, in parallel with a motor, to a plurality of power supply lines. Each of the power supply lines has a different phase. The monitoring apparatus includes a first isolator that selectively allows a first current to flow from a first power supply line to a second power supply line. A second isolator selectively allows a second current to flow from the second power supply line to a third power supply line. A control module controls the first isolator, controls the second isolator, and receives a first signal corresponding to a total current. The total current includes both the first current and the second current. The control module selectively generates a phase failure signal in response to the first signal indicating that a failure of at least one of the power supply lines has occurred.

A method for identifying a defect in at least one electrical component of an energy installation connected to an electrical grid is specified, wherein the energy installation includes at least one generator unit including at least one multiple-phase generator configured for producing electrical energy and a multiple-phase local transformer with a low-voltage side and a high-voltage side fed by the generator on the low-voltage side. The method includes the steps for monitoring a local voltage asymmetry value on the low-voltage side of the local transformer, and for comparing, in a first comparing step, the monitored local voltage asymmetry value to a predetermined threshold voltage asymmetry value. Furthermore, a generator unit, an energy installation, a computer-implemented method and a computer program product are specified.

Method and system for assessing and managing an electrical unbalance condition associated with a three-phase electrical system. An Intelligent Electronic Device (IED) coupled to the load acquires energy-related signals associated with the electrical system. A processor is configured to characterize electrical unbalance between a plurality of conductors analyze data associated with the characterization to identify electrical unbalance across the plurality of conductors, and determine the extent of the contribution of the electrical source(s), and the extent of the contribution of the load(s) in the electrical system, to the identified electrical unbalance condition.