Charging Cable Ground Fault Detection Across Multiple Grounding Systems
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Solution Overview
Problem
Existing charging cables for vehicles fail to correctly detect disconnection of the ground line across different grounding systems, leading to erroneous detection or failure to detect disconnections.
Innovation Solution
A charging cable with a control box containing a detection device that monitors grounding resistance and stores multiple reference resistance values for various grounding systems, allowing it to correctly detect ground line disconnections by comparing the actual resistance with the appropriate reference value.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a single reference resistance value is used for ground line disconnection detection, then the detection device is simple, but it cannot correctly detect disconnections across different grounding systems with varying grounding resistance
Solution Approach 1:
The patent applies parameter changes by storing multiple reference resistance values corresponding to different grounding systems (TN, TT, IT) in the detection device. The device selects and uses the appropriate reference resistance value based on the detected grounding system type, allowing accurate ground line disconnection detection across varying grounding resistance conditions without requiring complex hardware changes for each grounding system
Solution Approach 2:
The detection device achieves universality by incorporating a single multi-functional unit that can handle multiple grounding systems. The device detects the grounding system type and automatically adapts by selecting the corresponding reference resistance value, enabling one device to correctly detect ground line disconnections across different grounding systems (TN, TT, IT) without requiring separate detection devices for each system
2Adaptability or versatility
If the charging cable is designed for a specific grounding system, then the detection is accurate for that system, but the cable cannot be used across different regions with different grounding systems
Solution Approach 1:
The patent applies dynamics by making the detection device adaptive and flexible rather than fixed. The device dynamically detects the grounding system type (TN, TT, or IT) and automatically adjusts by selecting the appropriate reference resistance value from stored values, enabling the charging cable to maintain accurate disconnection detection performance across different grounding systems and regions without requiring physical replacement of components
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
Enables accurate detection of ground line disconnections regardless of the grounding system used, ensuring reliable operation across different regions without the need for replacing components or increasing the number of components in the charging cable.
Implementation Method 1
a detection device that detects disconnection of the ground line by monitoring grounding resistance of the ground line
Data Source
AI summary
A charging cable includes a cable body including a plurality of power lines and a ground line, and a control box provided at an intermediate position of the cable body, the control box includes a detection device that detects disconnection of the ground line by monitoring grounding resistance of the ground line, and the detection device stores a plurality of reference resistance values corresponding to a plurality of grounding systems and detects the disconnection of the ground line by comparing the grounding resistance of the ground line with a reference resistance value corresponding to a designated grounding system.