Solid-Insulated Conduit Module for Buried HV Lines
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Solution Overview
Problem
Existing high-voltage lines laid underground face reliability and maintenance challenges due to gas leakage, environmental concerns from SF6 gas, and complex construction requirements, which increase costs and reduce operational reliability.
Innovation Solution
A solid-insulated line module with a self-supporting design using a plastic foam outer insulating body, allowing for screw connections between modules and eliminating the need for gas-tight construction, which reduces environmental impact and simplifies maintenance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If gas-insulated tubular conductors (GIL) are used with SF6 gas, then excellent insulating properties are achieved, but environmental harm increases and gas leakage occurs
Solution Approach 1:
The patent extracts and removes the SF6 gas insulation medium from the system, replacing it with solid plastic foam insulation. This eliminates the environmental harm associated with SF6 gas while maintaining the necessary insulating properties through the solid insulating material that surrounds the conductor section.
Solution Approach 2:
The invention changes the physical state of the insulation medium from gaseous (SF6) to solid (plastic foam). This parameter change eliminates gas leakage issues and environmental concerns while providing equivalent or superior insulating performance through the solid material's dielectric properties.
2Reliability
If gas-insulated line modules are used, then insulating properties are maintained, but gas-tight construction requirements increase complexity and cost
Solution Approach 1:
The patent removes the requirement for gas-tight construction by extracting the gas insulation medium and replacing it with solid plastic foam insulation. This eliminates the need for complex sealing systems, flange connections, and gas pressure monitoring, significantly simplifying the overall construction.
Solution Approach 2:
By changing the insulation medium from gas to solid material, the invention fundamentally alters the construction requirements. The solid foam insulation eliminates the need for gas-tight seals and pressure-containing structures, reducing device complexity while maintaining insulating performance.
3Strength
If line modules are welded together before burial, then connection strength is ensured, but maintenance and repair become difficult
Solution Approach 1:
The patent divides the high-voltage line into modular sections with standardized coupling mechanisms. Each module can be independently connected and disconnected through coupling elements, allowing for easy maintenance and repair without requiring welding operations. The modular design enables individual modules to be replaced if needed.
Solution Approach 2:
The coupling elements are pre-designed and pre-assembled on each module, enabling quick field assembly and disassembly. This preliminary preparation of connection interfaces allows for rapid module replacement during maintenance, eliminating the need for complex welding operations in the field.
4Stability of the object's composition
If spacers and supports are added to support the outer tube, then structural stability is improved, but device complexity and cost increase
Solution Approach 1:
The patent merges the structural support function with the insulating function by integrating the plastic foam insulation material to also serve as the supporting medium. The foam material provides both electrical insulation and mechanical support for the conductor section, eliminating the need for separate spacer and support components.
Solution Approach 2:
The plastic foam insulation material performs multiple functions simultaneously: it provides electrical insulation, mechanical support for the conductor, structural stability for the outer tube, and protection against contamination. This multi-functionality reduces the total number of components while improving overall system efficiency.
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 enhances reliability and reduces costs by eliminating gas leakage, simplifying maintenance, and enabling operation at high voltages without the need for large resin insulators, while providing a stable and cost-effective connection method.
Implementation Method 1
the current conductor section of the line module according to the invention is essentially solid-insulated
Implementation Method 2
the line module has an at least partially conical projection on at least one axial end of the line module, which is designed to interact in a form-complementary manner with a conical recess of a further line module
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
The invention relates to a conductor module (1) for a buried high-voltage power line, comprising a conductor section (2), an outer tube (6) arranged concentrically around the conductor section, and an insulator arranged between the conductor section and the outer tube. The invention is characterized in that the insulator comprises an inner insulating body (4) made of a solid plastic and an outer insulating body (5) made of a plastic foam, each arranged concentrically around the conductor section. The invention further relates to a buried high-voltage power line with a plurality of conductor modules and a method for manufacturing the conductor modules.