Lightning Protection Connection Head With Friction Sleeve Contact
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Solution Overview
Problem
Existing connection systems for insulated down conductors in external lightning protection face challenges such as damage to the semiconductive layer during assembly, require excessive force for connection, and are prone to material degradation due to environmental influences, especially when using deformation-based positive-engagement parts.
Innovation Solution
A connection head piece with a sleeve structure featuring a static friction-generating means, such as spring elements or tongue sections, that compensates for diameter tolerances and ensures secure, non-damaging contact with the semiconductive layer, allowing for flexible insertion and maintaining electrical contact even with plastic material flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If deformation-based positive-engagement parts are used to fix the conductor in the sleeve, then mechanical fixation is achieved, but the semiconductive layer is damaged during assembly
Solution Approach 1:
A compression element is introduced as an intermediary component between the conductor and the sleeve wall. This compression element deforms radially to engage with the sleeve wall, providing mechanical fixation without the sleeve wall directly deforming the semiconductive layer. The compression element absorbs the deformation action, protecting the semiconductive layer from damage while still achieving secure mechanical fixation.
2Manufacturing precision
If the sleeve inner diameter is precisely adjusted to the conductor outer diameter, then secure contact is achieved, but tolerance compensation is difficult
Solution Approach 1:
The compression element is designed to be elastically deformable, allowing it to dynamically adapt to variations in conductor outer diameter within a tolerance range. When the conductor is inserted, the compression element deforms radially to match the actual conductor dimensions, automatically compensating for manufacturing tolerances without requiring precise pre-adjustment of the sleeve inner diameter.
3Reliability
If conventional connection systems are used, then electrical contact is achieved, but additional conductive or semiconductive sheathing is required
Solution Approach 1:
The compression element integrates multiple functions into a single component: it provides mechanical fixation by deforming against the sleeve wall, maintains electrical contact between the conductor and sleeve, and eliminates the need for separate conductive or semiconductive sheathing. This merging of functions simplifies the overall connection system while maintaining reliable electrical contact.
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 solution simplifies the mounting process, reduces the risk of damage to the semiconductive layer, and maintains reliable electrical contact under varying environmental conditions without the need for additional conductive or semiconductive sheathing, ensuring long-term functionality.
Implementation Method 1
a static friction-generating means formed as a spring element (8) is present in the first inner diameter section (4) of the sleeve (3), which flexibly projects into the interior of the sleeve (3) such that upon insertion of the down conductor (1), a nonpositive fit is established between an outer sheath of the insulated down conductor (1) and the sleeve (3)
Data Source
AI summary
The invention relates to a connection head piece for contacting an insulated down conductor in the external lightning protection, comprising a sleeve having an axially extending first inner diameter section adjusted to the outer diameter or cross-section of the insulated down conductor for receiving one end of the insulated down conductor, and having a second inner diameter section extending axially adjacent thereto and adjusted to the outer diameter or cross-section of a stripped, exposed conductor end of the insulated down conductor, and means for fastening the stripped, exposed conductor end in the second inner diameter section. According to the invention, a static friction-generating means is formed in the first inner diameter section of the sleeve and flexibly projects into the interior of the sleeve such that a nonpositive connection is established between an outer sheath of the insulated down conductor and the sleeve upon insertion of the down conductor.