HV Cable Jointing with Stratified Insulation Segments
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Solution Overview
Problem
The existing methods for jointing high voltage impregnated cables are time-consuming and costly due to the need for reconstructing multiple cable layers, including insulation, which requires manual handling and controlled environments, limiting efficiency and accuracy.
Innovation Solution
A jointing technique that involves cutting impregnated cable insulation layers perpendicular to the joint's longitudinal axis, using a conductive insert with minimal air gap, and applying stratified insulation with a viscous compound, eliminating the need for manual reconstruction of insulation layers and reducing jointing time and space requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If manual reconstruction of insulation layers is performed, then insulation integrity is maintained, but jointing time and cost increase significantly
Solution Approach 1:
The insulation system is segmented into modular components: pre-formed insulation segments with semi-conducting layers are manufactured separately and then assembled at the joint location, eliminating the need for manual layer-by-layer reconstruction while maintaining insulation integrity
Solution Approach 2:
Insulation segments are prepared in advance with pre-applied semi-conducting layers and impregnation, so that when assembled at the joint, they require minimal on-site work. The semi-conducting layers are pre-formed to the correct thickness and geometry, eliminating time-consuming manual application
2Manufacturing precision
If manual handling of insulation layers is required, then precise control is achieved, but operational complexity increases
Solution Approach 1:
The semi-conducting layers are designed to self-align and self-adhere to the insulation segments through inherent adhesive properties and geometric constraints, eliminating the need for complex manual positioning and handling operations while maintaining precise layer alignment
Solution Approach 2:
The insulation segments are provided as composite structures with integrated semi-conducting layers and impregnation, combining multiple functions into a single modular unit that simplifies handling while maintaining the precision of individual layers through factory-controlled manufacturing
3Reliability
If controlled environment is maintained, then joint quality is ensured, but device complexity increases
Solution Approach 1:
The insulation segments are provided as disposable, pre-packaged units with integrated semi-conducting layers and impregnation. Each segment is hermetically sealed in packaging that maintains the controlled environment until installation, eliminating the need for complex environmental control systems at the joint location while ensuring joint quality
Data Source
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AI summary
A method of jointing two high voltage impregnated cables (10a, 10b), each comprising a conductive core, made of a conductor (12a, 12b) wrapped in an inner semiconducting layer (14a, 14b), a cable insulation layer (16), impregnated with a viscous compound, radially external to the conductive core (13), an outer semiconducting layer (18) radially external to the cable insulation layer (16) and at least one protecting layer radially external to the outer semiconducting layer. A joint for splicing two HV impregnated cables and a power supply line comprising at least one joint are disclosed.