HVDC Cable Joint With Resistive Field Control Inserts
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Solution Overview
Problem
High-voltage direct current transmission over long distances is challenging due to stringent insulation and field load requirements, particularly in electrical installations where cable lengths are limited for production reasons.
Innovation Solution
A cable joint with a control body and conductive connection piece, featuring insulation-spaced, concentric conductive inserts for resistive field control, and a charge carrier arrester to manage surface charge carriers, allowing for reliable connections and reversible operation, with a dielectric strength of at least 320 kV.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If conventional cable connections are used for high-voltage direct current transmission, then cable installation is simplified, but transmission distance is limited due to insulation and field load requirements
Solution Approach 1:
The control body is divided into multiple control sections, each with its own control insert (first control insert, second control insert, etc.). These segmented control sections allow the electric field to be managed in discrete zones along the cable connection, enabling extended transmission distances while maintaining insulation reliability through localized field control in each segment.
2Length of moving object
If cable length is extended beyond production limits, then transmission distance increases, but field distribution control becomes difficult
Solution Approach 1:
Control inserts are introduced as intermediary elements between the conductor and the surrounding insulation. These inserts act as mediators that actively shape and control the electric field distribution along the extended cable length, ensuring uniform field characteristics even over distances exceeding standard production limits.
Solution Approach 2:
The spacing between control inserts is varied to optimize field distribution. By changing the parameter of insert spacing (closer spacing in high-stress regions, wider spacing in lower-stress regions), the invention achieves uniform field distribution along the entire extended cable length, compensating for the challenges of long-distance transmission.
3Reliability
If uniform field distribution is achieved through closely spaced control inserts, then field control improves, but device complexity increases
Solution Approach 1:
Different regions of the cable joint are assigned different control characteristics. Control inserts are strategically positioned with varying spacing based on local field stress requirements - denser spacing where field control is critical, and wider spacing where the field is naturally more uniform. This local differentiation achieves reliable field control without requiring uniformly dense inserts throughout the entire structure.
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
Enables reliable and efficient high-voltage direct current transmission over longer distances by ensuring uniform field distribution and optimal dielectric utilization, while preventing flashovers and mechanical reinforcement of connections.
Implementation Method 1
establish an electrical contact between the connection piece and the conductor end
Implementation Method 2
the control inserts are insulation-spaced, i.e. separated from one another by layers of insulation
Implementation Method 3
the charge carrier arrester...serves to discharge said surface charge carriers
Implementation Method 4
the control body is preferably impregnated with a resin, in particular an epoxy resin
Data Source
AI summary
The invention relates to a cable joint (1) for connecting two current conductor portions for conducting a direct current, comprising a control body (3) and a conductive connection piece (2) which is surrounded by the control body, wherein the connection piece has a first receptacle and a second receptacle, so that a conductor end of a first current conductor portion can be inserted into the first receptacle in order to establish an electrical contact between the connection piece and the conductor end of the first current conductor portion, and a conductor end of a second current conductor portion can be inserted into the second receptacle in order to establish an electrical contact between the connection piece and the conductor end of the second current conductor portion, and wherein the control body comprises insulation-spaced, concentric, conductive control inserts (11-17) for resistive field control.