Cable Assembly Furcation Shielding Unit
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Solution Overview
Problem
Existing cable assemblies for FTTA applications are insufficiently protected against damage from lightning strikes, particularly at high structures like buildings or towers, due to inadequate shielding and electrical overload issues.
Innovation Solution
A cable assembly with a modular shielding unit that provides 360° shielding of electrical power conductors, featuring a central conductive body and nut-like elements for compression, along with a separator element, which ensures secure electrical connections and directs lightning currents to ground, while also being adaptable to different cable diameters and numbers of tether cables.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a breakout enclosure in form of a box or a can is used for the joining location, then the cable assembly can connect hybrid cable and tether cables, but the cable assembly is insufficiently protected against damage by a lightning strike
Solution Approach 1:
The patent changes the shielding parameter from partial shielding (breakout enclosure) to 360-degree shielding by providing a shielding unit with a central body that completely surrounds the hybrid cable and tether cables at the joining location, establishing electrical contact with all shielding elements to create a Faraday cage effect that protects against lightning strikes
Solution Approach 2:
The shielding unit employs a nested structure where the central body of the shielding unit surrounds the hybrid cable and tether cables, with the shielding elements of the cables being nested within the central body, creating multiple concentric shielding layers that enhance lightning protection while maintaining a compact design
2Reliability
If the joining location is provided by a breakout enclosure, then cable connections can be established, but electrical overload on power conductors occurs due to lightning effects
Solution Approach 1:
The patent converts the harmful lightning electromagnetic impulse into a beneficial protective effect by using the shielding unit to intercept and redirect the lightning current through the shielding elements to ground, preventing the electromagnetic impulse from damaging the power conductors and transforming the threat into a controlled current path
Solution Approach 2:
The shielding unit acts as an intermediary between the lightning strike and the power conductors, intercepting the lightning current through its central body and shielding elements, and providing a safe path to ground, thereby mediating the interaction and protecting the vulnerable power conductors from direct exposure
3Reliability
If shielding elements of hybrid cable and tether cables are electrically connected, then lightning current can be transmitted to ground, but the connection complexity increases
Solution Approach 1:
The patent merges all shielding connections into a single integrated central body of the shielding unit, which simultaneously contacts the shielding element of the hybrid cable and the shielding elements of all tether cables, consolidating multiple connection points into one unified structure that simplifies the overall connection architecture
4Adaptability or versatility
If the cable assembly is designed for high structures like buildings or towers, then FTTA application requirements are met, but the risk of damage by lightning strike becomes considerable
Solution Approach 1:
The patent implements preliminary protective action by pre-installing the shielding unit at the joining location before the cable assembly is deployed to high structures, ensuring that the 360-degree shielding and lightning protection system is already in place and activated, preventing lightning damage before it can occur during operation at vulnerable elevated locations
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
The shielding unit effectively protects against lightning strikes by preventing electrical overload and ensuring secure connections, allowing the cable assembly to safely transmit power and data signals, even in high-risk locations.
Implementation Method 1
an electrical contact is established between the shielding element of the hybrid cable and the shielding elements of the respective electrical tether cables
Implementation Method 2
The shielding unit protects the electrical power conductors against an electromagnetic impulse and transmits a lightning current to ground
Data Source
Figure 1
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AI summary
A cable assembly (10) with electrical power conductors and fiber optic data lines, the cable assembly (10) comprising: a hybrid cable (11), a plurality of electrical tether cables (12), at least one fiber optic tether cable (13), and a furcation or joining location (14), wherein first electrical power conductors (15) of the hybrid cable (11) are branched off to or connected with second electrical power conductors (19) of the electrical tether cables (12) at the furcation or joining location (14), and wherein at least one first fiber optic data line (16) of the hybrid cable (11) is branched off to or connected with at least one second fiber optic data line (22) of the or each fiber optic tether cable (13) at the furcation or joining location (14). The furcation or joining location (14) comprises a shielding unit (27) establishing an electrical contact between a shielding element (17) of the hybrid cable (11) and shielding elements (20) of the respective electrical tether cables (12), the shielding unit (27) comprises a central body (28) made from an electrical conductive material surrounding the hybrid cable (11) and tether cables (12, 13) in the region of the furcation or joining location (14), wherein the central body (28) is in electrical contact with the shielding element (17) of the hybrid cable (11) and with the shielding element (20) of each electrical tether cable (12).