Supply Voltage Determination in Multiphase Networks
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Solution Overview
Problem
Existing methods for determining supply voltages in multi-phase networks, such as three-phase systems, face challenges due to potential differences between measurement and grid potentials, leading to inaccurate voltage readings, especially under asymmetrical loads and different connection configurations like star or delta connections, which complicates condition monitoring and energy consumption analysis.
Innovation Solution
A method using a measuring module with a semiconductor component and integrated circuit that employs correction matrices to mathematically adjust for potential differences, allowing for flexible adaptation to various operating situations, including the presence of a neutral conductor and load connections, without requiring hardware voltage transformers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If voltage transformers are used to compensate for potential differences, then measurement accuracy is improved, but device complexity increases
Solution Approach 1:
The patent replaces hardware voltage transformers with a mathematical correction approach using a correction matrix. The measurement unit determines measurement voltages, and the evaluation unit applies a correction matrix to calculate actual supply voltages, substituting physical transformation components with computational processing.
Solution Approach 2:
The patent transforms the measurement problem by changing from direct voltage measurement to a mathematical transformation of measurement voltages. The correction matrix transforms the relationship between measurement voltages and supply voltages, allowing accurate determination without physical voltage transformation hardware.
2Device complexity
If voltage dividers are connected to a common measurement potential, then the measuring system is simplified, but measurement accuracy deteriorates due to potential differences between measurement and grid potentials
Solution Approach 1:
The patent introduces a correction matrix as an intermediary between the measurement voltages and the actual supply voltages. This mathematical intermediary compensates for potential differences without requiring the measurement system to be physically reconfigured or connected to different reference potentials.
3Adaptability or versatility
If different connection configurations (star or delta) are supported, then adaptability is improved, but the difficulty of detecting and measuring increases
Solution Approach 1:
The patent creates a universal measurement system that handles both star and delta connections through a single evaluation algorithm. The correction matrix is configured based on the connection type, allowing the same hardware to universally support multiple connection configurations without requiring separate measurement circuits for each type.
Data Source
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AI summary
In order to reliably determine the supply voltages (Ui) of the individual phases (L1, L2, L3) of a load (4) in a multiphase supply network (2), in particular a three-phase supply network, a measuring module (6) is provided and is used to determine the supply voltages (Ui) from measuring voltages (Ui,mess) with the aid of a matrix operation. The matrix operation is used, in particular, to compensate for potential differences or potential shifts between the measuring system and the supply network (2) without the need for hardware measures, for example a voltage transformer.