Power Cable Connector Locking Structure Against Insulation Shrinkback
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Solution Overview
Problem
The risk of insulation shrinkback and flange bending in power cable accessories due to mechanical stresses and elevated temperatures, leading to electrical breakdown, is not adequately addressed by existing solutions.
Innovation Solution
A power cable accessory assembly featuring a connector with an inner surface structure that engages with a fastening device attached to the electrical insulation layer, using thermosetting or thermoplastic polymers, and a bayonet connection or screw fixation to maintain an axially fixed position, reducing shrinkback and enhancing durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the insulation layer is mechanically connected to the connector using a fastening device, then shrinkback is reduced, but the bending stiffness of the insulation layer decreases at elevated temperatures
Solution Approach 1:
The insulation layer is divided into multiple segments by cutting grooves at different positions, creating discrete anchor elements that can be independently engaged by the fastening device. This segmentation allows the insulation to maintain flexibility while providing multiple attachment points that collectively resist shrinkback forces.
Solution Approach 2:
The fastening device is pre-installed on the insulation layer before the connector is assembled. The cutting grooves and anchor elements are prepared in advance, allowing the fastening device to be securely attached to the insulation layer prior to final assembly, ensuring proper positioning and reducing shrinkback from the outset.
2Ease of operation
If the fastening device is attached to the end face of the insulation layer, then installation is simplified, but the connection strength decreases due to reduced engagement area
Solution Approach 1:
The engagement between the fastening device and insulation layer transitions from a two-dimensional surface connection to a three-dimensional mechanical interlock. The fastening device engages with the anchor elements through the cutting grooves, creating a multi-point mechanical connection that extends into the insulation layer, thereby increasing connection strength while maintaining simple installation.
Data Source
AI summary
A power cable accessory assembly including: a power cable including: a conductor, and an electrical insulation layer arranged around the conductor; a fastening device attached to an end face of the electrical insulation layer, and a connector mechanically connected to the conductor, wherein the connector has an inner surface provided with a structure that engages with the fastening device to maintain an axially fixed position between the connector and the electrical insulation layer.