HV Cable Termination With Segmented Deflectors and Heatsink Pipe
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Solution Overview
Problem
High-voltage dry type cable termination devices face challenges with moisture sensitivity, high costs, complex installation, and thermal management, particularly for small cable sizes, which can lead to overheating and reduced reliability.
Innovation Solution
A high-voltage cable termination device with a conical stress control device featuring separate deflector elements, an integrated metal heatsink pipe for thermal management, and a socket design that reduces the overall diameter and facilitates easy installation, using insulating foam to prevent electrical breakdown and coatings for enhanced heat radiation absorption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If dry type termination design is used, then reliability is improved by eliminating fluid insulating medium, but thermal management becomes difficult leading to cable overheating
Solution Approach 1:
A metal heatsink pipe is introduced as an intermediary thermal conductor between the cable and the external environment. The pipe is in direct thermal contact with the cable conductor, serving as a heat transfer mediator that conducts heat away from the cable without requiring fluid insulating medium, thus solving the thermal management problem in dry type terminations
Solution Approach 2:
The patent replaces the fluid-based thermal management system (convection and conduction through insulating oil) with a solid-state thermal conduction system using a metal heatsink pipe. This mechanical/thermal substitution eliminates the need for fluid while providing effective heat dissipation through direct thermal contact and conduction to the pipe surface
2Device complexity
If conventional single deflector stress controller device is used, then device complexity is reduced, but dielectric stress control is insufficient and device length increases
Solution Approach 1:
The stress controller device is segmented into two separate deflector elements positioned at different locations along the cable insulation. The first deflector is located near the cable end and the second deflector is positioned further along the insulation, creating multiple zones of electric field control. This segmentation provides superior dielectric stress control compared to a single deflector while keeping each individual deflector element relatively simple in structure
3Stress or pressure
If larger diameter stress controller device is used, then dielectric stress control is improved, but installation difficulty increases and space requirements increase
Solution Approach 1:
By segmenting the stress control function into two separate deflector elements, each deflector can be made smaller in diameter than a single comprehensive deflector would require. The first deflector handles stress control near the cable end while the second deflector manages stress further along the insulation, allowing both to be compact and easy to install while collectively providing superior stress control
Solution Approach 2:
The patent transitions from controlling dielectric stress primarily in the radial dimension (requiring large diameter) to controlling stress in both the axial and radial dimensions. By positioning deflectors at different axial locations, the system achieves comprehensive stress control without requiring large radial dimensions, thus reducing the overall device footprint and simplifying installation
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 provides improved heat dissipation, reduced dielectric stress, cost-efficient components, and simplified installation, ensuring long-term stability and safety for a wide range of cable sizes without free gas volumes, addressing the limitations of existing designs.
Implementation Method 1
Inside the insulator housing a metal pipe is fixed, whereby the metal pipe extends from the first end of the insulator housing to a point between the first end and second end of the insulator housing
Implementation Method 2
The metal pipe may be treated with a coating to increase absorption of heat radiation
Implementation Method 3
a space is provided between the inner surface of the insulator housing and the outer surface of the metal pipe. Advantageously, the space between the inner surface of the insulator housing and the outer surface of the metal pipe is filled with an electrically insulating foam
Implementation Method 4
the stress control device comprises a cone and is provided with a first deflector element and a second deflector element for controlling an electric field
Data Source
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AI summary
The present invention relates to a high-voltage (HV) dry type cable termination device. The cable termination device comprises an insulator housing (2) with a first end (2a) and a second end (2b), and a stress control device (21). The stress control device (21) comprises a cone and is provided with a first deflector element (21a) and a second deflector element (21b) for controlling an electric field, the first deflector element (21a) and the second deflector element (21b) being formed as separate parts. The stress control device is configured to be located in the insulator housing (2) and to be installed at a cable (20), wherein, when the stress control device is installed at said cable (20), said cone is parallel to the cable, and the beaked end of said cone points toward the first end (2a) of the insulator housing (2).