Dry-Type Cable Termination Device with Gel Insulation
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Solution Overview
Problem
Existing dry-type cable termination devices for high voltage cables are expensive, time-consuming to assemble, and pose environmental and safety risks due to the use of oil-based insulation, which can lead to severe damage in case of an explosion.
Innovation Solution
A prefabricated dry-type cable termination device with a stress controller having two deflector arrangements and a pipe-shaped member filled with insulating gel, allowing for easier handling, safer installation, and reduced environmental impact, as the device can be transported and installed in various positions without the need for on-site medium filling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional wet-type cable termination devices are used, then electrical insulation is provided, but environmental and safety risks increase due to oil-based insulation medium
Solution Approach 1:
The patent changes the physical state of the insulation medium from liquid (oil) to semi-solid (gel), eliminating environmental and safety risks while maintaining electrical insulation properties. The gel medium is contained within the stress controller device, providing reliable insulation without the harmful effects of traditional oil-based systems.
Solution Approach 2:
The patent uses a composite structure combining a stress controller device made of elastomeric compound with an integrated gel insulation medium. This composite material approach provides both mechanical stress control and electrical insulation in a single integrated component, eliminating the need for separate oil-filled housings.
2Object-affected harmful factors
If dry-type cable termination devices are used, then environmental safety is improved, but manufacturing cost increases
Solution Approach 1:
The patent merges the stress controller function and the insulation medium into a single integrated device. The elastomeric stress controller is filled with gel medium during manufacturing, creating a unified component that is both environmentally safe and cost-effective by eliminating the need for separate insulation housing and medium installation.
Solution Approach 2:
The gel insulation medium is pre-filled into the stress controller device during manufacturing before installation at the cable termination site. This preliminary action eliminates the need for complex on-site assembly and reduces manufacturing costs by simplifying the installation process.
3Adaptability or versatility
If cable termination devices are assembled on-site, then adaptability to different cables is improved, but assembly time and complexity increase
Solution Approach 1:
The stress controller device with gel medium is pre-assembled and sealed at the factory before installation. This preliminary assembly eliminates time-consuming on-site operations such as filling insulation medium and sealing components, significantly reducing assembly time while maintaining adaptability through proper design.
Solution Approach 2:
The patent employs a pre-assembled, sealed stress controller device that is installed as a complete unit. This approach treats the stress controller as a disposable or replaceable module, eliminating the need for complex on-site assembly operations and reducing installation time and complexity.
4Reliability
If oil-based insulation medium is used, then electrical insulation is provided, but safety risks increase in case of explosion
Solution Approach 1:
The patent changes the insulation medium from flammable liquid oil to non-flammable gel, eliminating explosion risks while maintaining electrical insulation properties. The gel medium remains contained within the elastomeric stress controller, providing reliable insulation without the safety hazards of traditional oil-based systems.
Solution Approach 2:
The patent converts the potential harm of liquid insulation medium (explosion risk) into a benefit by using gel material that cannot explode. The gel provides the same electrical insulation function as oil but eliminates the safety hazard, turning a potentially harmful system into a safe one.
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 enables a safer, quicker, and more environmentally friendly cable termination process, concentrating electric field control between the deflector arrangements, reducing the risk of damage, and allowing for use on cables with varying diameters, while eliminating the need for on-site medium filling and reducing assembly time.
Implementation Method 1
an electrically insulating gel filling at least part of the hollow interior of the insulator housing and surrounding at least part of the stress controller device
Implementation Method 2
the stress controller device is provided with a first and a second deflector arrangement for controlling an electric field
Data Source
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AI summary
A cable termination device of the dry type, for terminating a high voltage cable (30), comprising an insulator housing (1) with a first end (10) and a second end (11) and having a hollow interior (9), and which second end has an opening for insertion of a high voltage cable. The cable termination device further comprises a stress controller device (5) located inside the insulator housing (1) and adapted to be mounted on a high voltage cable, an end cap (15) located at the first end (10) of the insulator housing and provided with an external electrical connection means (17), and an electrically insulating gel (23) filling at least part of the hollow interior (9) of the insulator housing (1) and surrounding at least part of the stress controller device (5). Further, the stress controller device (5) is provided with a first (21) and a second (22) deflector arrangement for controlling an electric field. The invention also includes a method for prefabricating a cable termination device for a high voltage cable, and a method for achieving a cable termination on a high voltage cable.