Asymmetric Neutral-Line Wire Structure for Leakage Current Limiting
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Solution Overview
Problem
Existing electrical wires do not effectively limit leakage currents, which can lead to electric shock, especially in flooded conditions.
Innovation Solution
The electrical wire design includes a neutral line with a larger cross-sectional area than the phase voltage line, which limits leakage currents by providing a low-resistance path for leaked current to flow away from the human body.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the neutral line has a larger cross-sectional area than the phase voltage line, then leakage current is limited, but the device structure becomes more complex
Solution Approach 1:
The patent applies asymmetry by making the neutral line have a larger cross-sectional area than the phase voltage line. Specifically, the neutral line has a cross-sectional area of 2.08mm² while the phase voltage line has 1.5mm². This asymmetric design creates a preferential low-resistance path for leakage current to flow through the neutral line rather than through the human body, effectively limiting leakage current while maintaining a relatively simple overall structure.
Solution Approach 2:
The patent changes the physical parameter of cross-sectional area to achieve leakage current limitation. By increasing the cross-sectional area of the neutral line relative to the phase voltage line, the electrical resistance of the neutral line is reduced, creating a lower impedance path for leakage current. This parameter change directly addresses the safety requirement without requiring complex additional components.
2Reliability
If a larger cross-sectional area neutral line is used, then leakage current is reduced, but the wire diameter and space requirements increase
Solution Approach 1:
The patent uses asymmetric wire design where only the neutral line has a larger cross-sectional area (2.08mm²) compared to the phase voltage line (1.5mm²). This selective asymmetry provides the necessary low-resistance path for leakage current while minimizing the overall space requirement, as only one conductor needs to be enlarged rather than all conductors.
Solution Approach 2:
The patent applies local quality by concentrating the larger cross-sectional area specifically in the neutral line where it is most needed for leakage current return path. The phase voltage lines maintain their standard smaller cross-sectional area, optimizing the overall wire bundle size while providing enhanced safety functionality where required.
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
This design significantly reduces the risk of electric shock by minimizing leakage currents, even in flooded conditions, by ensuring that leaked currents flow through the neutral line rather than to the human body.
Implementation Method 1
a neutral line (N line) having an annular cross section, which is provided to surround the first phase voltage line from an outside while spaced apart from the first phase voltage line such that the neutral line has a greater cross-sectional area than that of the first phase voltage line to limit a leakage current leaking from the first phase voltage line
Data Source
AI summary
The present disclosure relates to an electrical wire having a leakage current limiting function, in which, since a neutral line is provided to have a greater cross-sectional area than that of a phase voltage line, a leakage current leaking from the phase voltage line may be limited, and thus the risk of electric shock to the human body due to the leakage current may be minimized.