Parallel Switching Paths for Electrical Devices
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Solution Overview
Problem
Electrical switching devices with parallel paths face challenges in managing high currents due to the need for low-resistance switching paths, as individual paths must have sufficient extinguishing capacity to handle current zero crossings, leading to high manufacturing costs and potential failure if one path cannot extinguish the current.
Innovation Solution
Implementing a method where all parallel switching paths allocated to a phase open within a defined window correlated to current zero crossings, allowing each path to handle only a fraction of the current, thereby reducing the required switching power capacity and ensuring reliable operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If parallel switching paths are used to reduce total electrical resistance, then current carrying capacity is improved, but individual path extinguishing capacity requirements increase leading to higher costs
Solution Approach 1:
The invention divides the switching operation into two independent stages: a first switching mechanism opens one set of contacts, and a second switching mechanism opens another set of contacts in parallel. This segmentation allows each mechanism to handle only a portion of the total current, reducing the extinguishing capacity requirements and manufacturing costs of individual components while maintaining the overall high current carrying capacity of the parallel arrangement.
2Reliability
If individual switching paths are designed with sufficient extinguishing capacity, then reliability is improved, but switching power capacity requirements increase
Solution Approach 1:
The invention segments the current interruption function across two separate switching mechanisms operating in parallel. Each mechanism is responsible for opening its own contacts and handling a fraction of the total current, which reduces the switching power capacity required for each individual mechanism while ensuring that the combined system maintains high reliability through redundant parallel paths.
Solution Approach 2:
Instead of requiring a single switching path to handle the full current extinction, the invention uses partial action by dividing the extinction task across multiple parallel paths. Each path performs only a portion of the total work, allowing individual components to be smaller and less powerful while the collective system achieves the required reliability and performance.
Data Source
AI summary
A method for operating an electrical switching device and an electrical switching device are disclosed. In order to ensure reliable operation of an electrical switching device having parallel switching paths allocated to a phase, which have lower switching capacity in comparison to conventional parallel switching paths, the zero current crossings in the phase are detected and at least one switching mechanism, operatively connected to the switching paths, is actuated so that all parallel switching paths allocated to the phase open within a window of time which is in the phase relative to the zero current crossings.