Berry Global Group. has been granted a patent for a method and electric circuit arrangement that determines branch insulation resistance and leakage capacitance in ungrounded power supply systems. The method utilizes a controllable measuring voltage source and a current sensor to analyze residual current through frequency modulation, eliminating the need for additional communication channels. GlobalData’s report on Berry Global Group gives a 360-degree view of the company including its patenting strategy. Buy the report here.
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According to GlobalData’s company profile on Berry Global Group, Extrusion-based additive manufacturing was a key innovation area identified from patents. Berry Global Group's grant share as of July 2024 was 56%. Grant share is based on the ratio of number of grants to total number of patents.
Method for measuring branch insulation resistance and leakage capacitance
The patent US12072366B2 presents a method and an electric circuit arrangement for determining branch insulation resistance (Rz) and branch leakage capacitance (Cz) in a branched, ungrounded power supply system. The method involves generating a measuring voltage (Um) using a controllable voltage source and feeding this voltage into active conductors at a central location. A current sensor registers the residual current (Iz) caused by the measuring voltage in the monitored line branch. The innovation lies in the alternating formation of the measuring voltage from two distinct frequency compositions (F1 and F2) over a generator period (P). The current sensor performs a frequency analysis of the residual current to identify the active frequency composition and compute the insulation resistance and leakage capacitance based on the measured current, voltage, and coupling resistances.
The electric circuit arrangement includes components such as a controllable measuring voltage source, a coupling circuit, and a current sensor. The measuring voltage source is designed to alternate between the two frequency compositions, each containing at least two frequencies, with the ability to switch coupling resistances accordingly. The current sensor is equipped with data storage for the coupling resistances and frequency compositions, and it features a computing unit that executes the necessary frequency analysis. This arrangement allows for precise determination of insulation resistance and leakage capacitance, enhancing the monitoring capabilities of ungrounded power supply systems. The method and circuit are particularly applicable in insulation monitoring and fault location devices, ensuring improved safety and reliability in electrical systems.
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