Neutral Bus Bar Expansion for Leakage Current Limiting
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Solution Overview
Problem
Existing bus bar modules in distribution boards do not effectively limit leakage current, posing a risk of electric shock, particularly when submerged in water.
Innovation Solution
A distribution board bus bar module with a neutral main bus bar area expansion unit that increases the area of the neutral bus bar, limiting leakage current by redirecting it through a larger conductive path, and is housed within insulating materials to prevent exposure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the neutral main bus bar area is expanded, then leakage current is limited, but device complexity increases
Solution Approach 1:
The neutral main bus bar area expansion unit is divided into an upper area expansion unit and a lower area expansion unit that are separately coupled to the neutral main bus bar. This segmentation allows the leakage current limitation function to be achieved through modular additions rather than redesigning the entire bus bar structure, thus limiting complexity increase while maintaining reliability improvement.
Solution Approach 2:
The neutral main bus bar area expansion unit acts as an intermediary component that is electrically connected to the neutral main bus bar. This intermediary structure provides the additional surface area needed for leakage current limitation without requiring direct modification of the original bus bar design, resolving the contradiction between reliability improvement and device complexity.
2Reliability
If the neutral main bus bar area is expanded, then leakage current is limited, but manufacturing cost increases
Solution Approach 1:
By segmenting the area expansion into separate upper and lower units that can be independently manufactured and then coupled to the neutral main bus bar, the manufacturing process becomes more flexible. This allows for standardized production of modular components, reducing overall manufacturing cost while achieving the reliability benefit of leakage current limitation.
Solution Approach 2:
The upper and lower area expansion units are nestedly coupled to the neutral main bus bar, with each unit providing additional surface area in a compact configuration. This nesting approach maximizes the leakage current limitation effect within minimal space and material usage, thereby controlling manufacturing costs while improving reliability.
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
Minimizes the risk of electric shock by reducing leakage current flow to the human body, even in submerged conditions, by expanding the neutral bus bar area and routing current through a neutral line.
Implementation Method 1
a neutral main bus bar area expansion unit that is in electrical contact with the neutral main bus bar of the main bus bar to expand an area of the neutral main bus bar so as to limit a leakage current
Data Source
AI summary
The present disclosure relates to a distribution board bus bar module having a leakage current limiting function, in which a current leaking from a bus bar module used in a distribution board may be limited by expanding an area of a bus bar connected to a neutral line among bus bars of the bus bar module used in the distribution board, and thus the risk of electric shock to the human body due to a leakage current can be minimized.