Solid-State Breaker Pole Sequencing for Arc Flash Control
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Solution Overview
Problem
Traditional circuit breakers face challenges in managing different electrical properties across phases during a short circuit event, leading to potential arc flashes and increased severity of exposed incident energy.
Innovation Solution
A solid-state circuit breaker system that includes sensors to measure electrical properties and a control system to coordinate the closing and opening of semiconductor devices across phases, thereby controlling the firing angles and reducing the available short circuit current.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If all three phases are closed simultaneously using three contactors, then the closing operation is simple and fast, but each contactor experiences different electrical properties leading to potential arc flash and increased incident energy
Solution Approach 1:
The patent segments the simultaneous closing operation into sequential phase-specific closing operations. Each phase is closed independently with its own controlled timing, allowing the system to account for different electrical properties on each pole while maintaining overall coordination. This segmentation eliminates the arc flash hazard associated with simultaneous closing by ensuring each contactor operates under controlled conditions.
Solution Approach 2:
The control system performs preliminary assessment of electrical properties for each phase before initiating the closing operation. By measuring and evaluating the electrical characteristics of each pole in advance, the system can determine optimal closing sequences and timing, preventing arc flash conditions from developing during the closing process.
2Reliability
If traditional breakers account for uncertainty in design with increased clearance, then reliability improves, but space constraints are worsened
Solution Approach 1:
The patent replaces traditional mechanical switching mechanisms with solid-state semiconductor devices. This substitution eliminates the need for large mechanical clearances and moving parts, allowing the breaker to achieve high reliability through electronic control and coordination of semiconductor switching operations while maintaining a compact physical footprint.
Solution Approach 2:
The control system dynamically adjusts operational parameters such as firing angles and timing sequences for each phase based on real-time electrical conditions. By optimizing these parameters, the system achieves reliable operation without requiring excessive physical clearance, as the reliability is achieved through precise control rather than physical spacing.
3Object-affected harmful factors
If solid-state circuit breaker uses semiconductor devices with coordinated firing angles, then arc flash likelihood is reduced, but device complexity increases
Solution Approach 1:
The patent incorporates feedback mechanisms where the control system continuously monitors electrical conditions and adjusts the firing angles and timing of semiconductor devices accordingly. This feedback loop enables the system to maintain optimal arc flash prevention performance by adapting to changing electrical properties on each pole, while the automated nature of the feedback reduces the perceived complexity through self-regulation.
Solution Approach 2:
The control system is designed to perform multiple functions: it measures electrical properties, determines optimal closing sequences, coordinates semiconductor firing angles, and monitors for fault conditions. By consolidating these diverse functions into a single multi-functional control unit, the patent reduces overall system complexity compared to having separate dedicated systems for each function.
Data Source
AI summary
A method may include receiving, via at least one processor, a first set of data indicative of a fault being present and send a first signal to a breaker based on the first set of data. The first signal may cause the breaker to open a plurality of poles of the breaker. The method may then involve receiving a second set of data indicative of the fault being cleared and sending a second signal to the breaker based on the second set of data. The second signal may cause the breaker to close a first pole of the plurality of poles at a first time and close a second pole of the plurality of poles at a second time different from the first time.