Flexible Dielectric Isolation Link for High Voltage Reconductoring
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Solution Overview
Problem
Existing methods for replacing overhead power lines and static wires face challenges with high voltage environments, where pulling ropes can melt or break due to moisture and dirt, leading to electrical hazards and inefficiencies in reconductoring or restringing processes.
Innovation Solution
A flexible, insulated isolation link with a dielectric membrane filled with oil, featuring sealed coupling members and a dielectric rope, which provides electrical isolation and allows for relative motion to relieve torsional loads, preventing circulating currents and maintaining insulation even in harsh conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a pulling rope is used in high voltage environments, then the reconductoring or restringing process can be performed, but the rope may melt or break due to moisture and dirt, leading to electrical hazards
Solution Approach 1:
The patent introduces a flexible isolation device as an intermediary component between the pulling rope and the conductor being replaced. This device includes a flexible dielectric member (such as a rope or cable) that is non-conductive and provides electrical isolation. The pulling rope is attached to one end of the isolation device, while the other end attaches to the conductor, allowing the pulling rope to perform its function without direct electrical contact with the high voltage environment.
Solution Approach 2:
The flexible isolation device employs composite material construction, combining a flexible dielectric member with coupling members. The dielectric member itself may be composed of multiple layers or composite materials that provide both flexibility for handling and sufficient dielectric strength for electrical isolation. This composite approach allows the device to simultaneously achieve mechanical flexibility and electrical insulation properties.
2Reliability
If a rigid electrical insulator is used to isolate the conductor from the pulling wire, then electrical isolation is achieved, but the device cannot relieve torsional loads and shearing loads
Solution Approach 1:
The patent employs a flexible dielectric member rather than a rigid insulator. This flexible member can dynamically adapt to various loading conditions including torsional and shearing loads. The flexibility allows the member to bend, twist, and deform elastically under load while maintaining its electrical insulation properties, thus simultaneously achieving both electrical isolation and mechanical adaptability.
Solution Approach 2:
The flexible isolation device changes its physical parameters (shape, orientation, internal stress distribution) in response to applied loads while maintaining its fundamental function of electrical isolation. The dielectric properties are preserved across a range of mechanical deformations, allowing the device to adapt to varying operational conditions without compromising electrical safety.
3Adaptability or versatility
If a flexible member is used to allow rotation and relieve torsional loads, then adaptability is improved, but the electrical insulation may be compromised
Solution Approach 1:
The flexible dielectric member is constructed using composite materials that maintain dielectric properties even when flexed or rotated. The composite structure may include multiple layers with different properties - some providing flexibility and rotational capability, others maintaining electrical insulation. This allows the member to undergo mechanical deformation while preserving its electrical isolation function.
Solution Approach 2:
The patent utilizes a flexible dielectric member that functions as a flexible shell or film providing electrical isolation. This flexible structure can bend and rotate without cracking or compromising its insulating barrier, unlike rigid insulators. The flexibility is inherent in the material composition and structure, allowing rotational movement while maintaining continuous dielectric protection.
4Reliability
If a pulling wire is used instead of a pulling rope, then electrical hazards are reduced, but the need for a flexible electrically isolating link is created
Solution Approach 1:
The patent merges the functions of the pulling mechanism and the electrical isolation component into a single integrated flexible isolation device. The flexible dielectric member serves dual purposes: it acts as the pulling element to transfer tension forces during conductor replacement, and simultaneously provides the electrical isolation barrier. This eliminates the need for separate pulling wire and isolation link components.
Solution Approach 2:
The flexible isolation device is designed as a multi-functional component that performs multiple roles: (1) transmitting pulling forces during conductor replacement, (2) providing electrical isolation between the pulling system and the conductor, (3) allowing rotational movement to relieve torsional loads, and (4) serving as a mechanical link between the pulling rope and the conductor. This universal design reduces overall system complexity despite the demanding operational requirements.
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 effectively isolates old conductors or static wires from pulling wires, preventing electrical hazards and ensuring safe and efficient replacement processes by maintaining insulation and resisting moisture and dirt, thus reducing the risk of equipment failure.
Implementation Method 1
an inelastic flexible dielectric member having first and second opposite ends, the dielectric member journalled in the membrane
Implementation Method 2
the membrane filled with a dielectric fluid so as to displace any air in the membrane and the dielectric member
Implementation Method 3
the first and second ends of the membrane mated in sealed engagement with the first and second coupling members so that the first and second coupling members fluidically seal
Data Source
AI summary
An electrical isolator includes a flexible non-electrically conductive membrane and an inelastic flexible dielectric member journalled in the membrane and extending from the first end of the membrane to the second end of the membrane. First and second coupling members are anchored to the ends of the dielectric member. The ends of the membrane are mated in sealed engagement with the coupling members so that the coupling members fluidically seal the ends of the membrane and fluidically seal the dielectric member within the membrane. The membrane is filled with a dielectric fluid so as to displace any air in the membrane and the dielectric member. The coupling members are adapted to couple to objects at opposite ends of the electrical isolator.