Accessory Device for Detecting Current Flow in Electric Cable
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Solution Overview
Problem
Existing monitoring and diagnostic devices for electric power equipment face challenges in accurately measuring current due to unstable coupling between electric cables and device casings, particularly in small installation volumes and varying cable sizes, leading to measurement errors exceeding 5%.
Innovation Solution
The accessory device features a casing with a holder element having multiple holding surfaces that can be selectively positioned to accommodate electric cables of different sizes, ensuring stable coupling with current sensors, and includes electronic means with Hall sensors for precise current detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional plastic strips and cable ties are used to hold the electric cable in position, then the device structure remains simple, but the cable positioning becomes unstable leading to measurement errors exceeding 5%
Solution Approach 1:
The top shell is segmented into a main body and a removable holder element that can be independently positioned and secured. This segmentation allows the holder element to provide precise cable positioning features while keeping the main casing structure relatively simple. The holder element acts as a separate functional module that can be attached only when cable measurement functionality is needed.
Solution Approach 2:
The holder element is designed to be movable and repositionable along the first lateral wall, allowing dynamic adjustment of cable holding positions. This dynamic capability enables the same holder element to accommodate cables of different diameters and positions, improving measurement accuracy without requiring multiple fixed structures.
2Adaptability or versatility
If the device uses a standardized casing design, then manufacturing costs are reduced, but it becomes difficult to accommodate electric cables of different sizes leading to unstable coupling
Solution Approach 1:
The holder element serves multiple functions: it holds cables of different diameters, positions cables at correct locations relative to sensors, and can be removed when not needed. The first holding surface is designed with features that can universally accommodate various cable sizes while maintaining stable coupling and precise positioning for accurate current measurements.
Solution Approach 2:
The holder element acts as an intermediary component between the standardized casing and the electric cable. It provides the necessary adaptability features (holding surfaces, positioning structures) while allowing the main casing to remain standardized. This mediator enables versatile cable accommodation without compromising coupling stability.
3Volume of stationary object
If the installation volume is reduced to make the device more compact, then space requirements are minimized, but the cable positioning becomes even more difficult to stabilize
Solution Approach 1:
The holder element is nested within the recess formed by the first lateral wall and bottom wall of the top shell. This nested arrangement allows the cable positioning mechanism to be integrated within the compact device volume without requiring additional external space. The holder element fits into the existing structural recesses, maintaining compactness while providing necessary cable stabilization.
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 solution stabilizes the electric cable position relative to current sensors, significantly reducing measurement errors to below 5%, improving accuracy and adaptability across various cable sizes.
Implementation Method 1
The accessory device features electronic means with Hall sensors for precise current detection
Data Source
AI summary
An accessory device for low or medium voltage electric applications includes a casing and electronic means including one or more current sensors for detecting current flowing in an electric cable. The top shell of the casing includes an external recess having a cable seat for accommodating the electric cable in a transversal position with respect to the casing. The cable seat has a cable coupling surface adapted to mechanically couple with the electrical cable. The accessory device includes a holder element mechanically coupleable with the top shell in the external recess. The holder element includes one or more holding surfaces. Each of the holding surfaces is overlapped and mechanically coupled with the electric cable, when the holder element is positioned in the external recess in a corresponding accommodating position that is selectable depending on the size of the electric cable. Each of the holding surfaces, when overlapped and coupled with the electric cable, cooperates with the cable coupling surface to hold the electric cable in a given position with respect to the current sensors.