Arc Fault Detection Arrangement for DC Electric Bus
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Solution Overview
Problem
Traditional arc fault detection systems for DC electric buses are cumbersome, time-consuming to install, difficult to integrate with other components, and expensive, making them inefficient and costly for photovoltaic electric power generation systems.
Innovation Solution
A simplified arc fault detection arrangement using a current sensing device with a single magnetic circuit and secondary winding means, integrated with a PCB support, which detects AC currents indicative of arc faults and provides control signals to interrupt the electric lines, reducing common mode disturbances and requiring fewer components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple sensing devices and multiple arc fault detectors are used to detect arc faults, then the detection reliability is improved, but the device complexity and installation time increase
Solution Approach 1:
The patent combines multiple sensing functions into a single integrated current sensing device with a single magnetic circuit that can detect AC currents across multiple electric lines simultaneously. This merging approach maintains arc fault detection reliability while reducing device complexity and installation requirements compared to using multiple separate sensing devices and detectors
Solution Approach 2:
The current sensing device is designed with multi-functionality to detect AC currents indicative of arc faults across multiple electric lines (L1, L2, ..., LN) using a single magnetic circuit and secondary winding means. This universal design allows one device to perform what previously required multiple specialized devices, reducing overall system complexity
2Reliability
If multiple sensing devices and arc fault detectors are deployed, then the detection coverage is improved, but the installation time and cost increase
Solution Approach 1:
The patent merges multiple detection functions into a single integrated device that can monitor multiple electric lines simultaneously. This consolidation reduces installation time by requiring only one device installation rather than multiple separate devices, while maintaining comprehensive detection coverage across all monitored lines
Solution Approach 2:
The magnetic circuit is designed with multiple primary winding conductors (PW1_1, PW1_2, ..., PW1_N) that can be separately connected to different electric lines, allowing modular installation while using a single integrated sensing device. This segmentation enables flexible installation approaches that reduce overall installation time and complexity
3Measurement precision
If a complex arrangement with multiple components is used, then the detection precision is improved, but the manufacturing cost and occupied volume increase
Solution Approach 1:
The patent combines multiple sensing functions into a single magnetic circuit with secondary winding means, reducing the total number of components required. This merging approach maintains detection precision through the integrated design while reducing manufacturing costs by eliminating the need for multiple separate devices and their associated assembly processes
Solution Approach 2:
The single current sensing device is designed to perform multiple detection functions across different electric lines, reducing the overall component count and manufacturing complexity. The universal design allows one device to replace multiple specialized devices, lowering both manufacturing costs and occupied volume while maintaining detection precision
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution enables easy installation, integration, and cost-effective manufacturing, while providing high reliability and immunity to false tripping, with reduced occupied volumes and installation errors, thus enhancing safety and efficiency in arc fault detection.
Implementation Method 1
a current sensing device (1) having a single magnetic circuit (2) that is enchained with the electric lines L1, ..., LN
Data Source
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AI summary
An arc fault detection arrangement (50) for a DC electric bus (100), said DC electric bus having a plurality of electric lines (L1, L2, LN) adapted to electrically connect a source section (200) and a load section (300) of an electric apparatus (500), said arc fault detection arrangement comprising an arc fault detector (10) adapted to receive and process detection signals (DS) indicative of AC currents flowing along said electric lines (L1, L2, LN) characterised in that it comprises a current sensing device (1). Said current sensing device comprises: - primary winding means (21) comprising a plurality of first primary winding conductors (PW11, PW12, PW1N) adapted to be electrically connected in series with source portions (C1S) and load portions (C1L) of corresponding first line conductors (C1) of said electric lines (L1, L2, LN); - secondary winding means (22) magnetically coupleable with said first primary winding means, said secondary winding means comprising at least a first secondary winding conductor (SW1) electrically connected with said arc fault detector (10) to provide said detection signals (DS) to said arc fault detector.