Solar Combiner Busbar with Hall Effect Sensors for Arcing Fault Detection
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Solution Overview
Problem
Large solar arrays face issues with arcing due to high voltages, which can cause damage and fires, and existing systems lack effective monitoring and fault detection mechanisms for combined power sources.
Innovation Solution
A system that combines multiple solar panel source circuits into a single output circuit using a combiner assembly with a busbar and Hall effect sensors to monitor current and detect faults, including arcing, with a contactor to interrupt current flow in case of a fault.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If multiple solar panel source circuits are combined into a single output circuit to increase power output, then the power production capability is improved, but the risk of arcing and fire damage increases due to high voltages
Solution Approach 1:
The system divides the combined output circuit into individually monitorable segments by placing a sensor adjacent to each busbar finger that connects to a specific source circuit. This segmentation allows independent monitoring of current in each circuit segment, enabling detection of arcing conditions in specific segments without affecting the entire system.
Solution Approach 2:
Hall effect sensors are introduced as intermediary devices between the high-voltage busbar fingers and the monitoring system. These sensors detect current through magnetic field interaction without direct electrical contact, providing isolation from the high-voltage circuits while enabling continuous monitoring of current levels to detect arcing conditions.
2Reliability
If sensors are installed to monitor current in each source circuit to detect faults, then the detection capability is improved, but the device complexity increases
Solution Approach 1:
The system replaces complex electrical contact-based current measurement methods with Hall effect sensors that utilize magnetic field detection. This substitution eliminates the need for direct electrical connections to each circuit, simplifying installation and reducing complexity while maintaining reliable fault detection capability.
3Object-affected harmful factors
If a contactor is added to interrupt current flow in case of fault detection, then the safety is improved, but the device complexity increases
Solution Approach 1:
A contactor is installed in the combined output circuit as a preliminary safety measure that can rapidly interrupt current flow when arcing or fault conditions are detected. This preliminary protective action is prepared in advance and automatically activated when sensors detect abnormal conditions, preventing fire damage before it can occur.
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 system effectively monitors and manages the combined power output from multiple solar panels, detecting faults such as arcing and preventing damage by interrupting current flow, thus ensuring safe and efficient operation of solar arrays.
Implementation Method 1
The sensor may be a Hall effect sensor mounted adjacent the busbar finger so that the Hall effect sensor is responsive to the magnetic field produced by the electric current flowing through the finger of the busbar
Data Source
AI summary
A system for combining multiple direct current power sources is provided. The system is operable to combine multiple feeds from an array of power generating elements, such as solar panel arrays and combine the feeds into a single voltage output. The system includes a current monitoring assembly operable to monitor the current from each input to evaluate whether there is a malfunction or other problem associated with a particular output. An alarm or other signal can be provided to inform the operator of which power generating element in the array need to be analyzed.