Flexible Electrical Isolator for High Voltage Line Replacement
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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 and restringing processes.
Innovation Solution
A flexible, insulated isolation link is used to electrically isolate the old conductor or static wire from the pulling wire, utilizing a dielectric synthetic rope encased in a membrane filled with dielectric fluid, with anchoring spelters and couplings that allow for torsional relief and relative motion, preventing circulating currents and maintaining insulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a pulling rope is used in high voltage environments, then the reconductoring and restringing processes can be performed, but the rope can melt or break due to moisture and dirt, leading to electrical hazards
Solution Approach 1:
The patent introduces a flexible isolator as an intermediary component between the pulling wire and the conductor being replaced. This isolator acts as a mediator that allows the pulling operation to proceed while simultaneously providing electrical insulation to prevent hazards. The isolator includes a flexible member with dielectric properties that bridges the mechanical connection need while blocking electrical current flow.
Solution Approach 2:
The flexible isolator employs composite material construction, combining flexible dielectric materials with conductive elements (such as spelters) in a single integrated component. This composite structure allows the isolator to simultaneously provide mechanical flexibility for pulling operations, electrical insulation to prevent melting or breaking in high voltage environments, and structural integrity through the combination of different material properties.
2Reliability
If a flexible isolator is used to provide electrical insulation, then electrical safety is improved, but the device complexity increases due to multiple components including dielectric members, spelters, and couplings
Solution Approach 1:
The patent merges multiple functional components into a single integrated flexible isolator assembly. The dielectric member, spelters (conductive elements), and coupling mechanisms are combined into one unified device that performs both mechanical coupling and electrical insulation functions simultaneously. This merging reduces the number of separate components that would otherwise be needed and simplifies the overall assembly process.
Solution Approach 2:
The flexible isolator is designed as a multi-functional device that simultaneously provides electrical insulation, mechanical flexibility, tensile load bearing capacity, and rotational freedom. The single device serves multiple purposes: isolating electrical currents, withstanding pulling forces, and allowing relative motion between components. This multi-functionality eliminates the need for separate specialized components for each function.
3Reliability
If a rigid insulating rod is used to provide electrical isolation, then insulation is maintained, but the device cannot relieve torsional loads and shearing loads, reducing adaptability
Solution Approach 1:
The patent replaces the static rigid insulating rod with a dynamic flexible isolator that can adapt its configuration during operation. The flexible member allows relative motion, rotation, and deformation to accommodate torsional and shearing loads while maintaining electrical insulation. This dynamic capability enables the isolator to respond to varying mechanical stresses during the pulling operation, providing both insulation and load relief.
Solution Approach 2:
The flexible isolator utilizes changes in physical parameters such as flexibility, rotational freedom, and structural configuration to simultaneously maintain electrical insulation and relieve mechanical loads. By allowing parameters like angle of rotation and degree of flexibility to vary, the device can adapt to different loading conditions while preserving its insulating properties, unlike a fixed rigid rod with constant parameters.
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 prevents electrical hazards by maintaining insulation and allowing for safe replacement of power lines and static wires, even in high voltage environments, by breaking electrical circuits and reducing ground circulating currents, while withstanding tensile loads and adverse weather conditions.
Implementation Method 1
A flexible, insulated isolation link is used to electrically isolate the old conductor or static wire from the pulling wire, utilizing a dielectric synthetic rope encased in a membrane filled with dielectric fluid
Data Source
Figure 1~1A
Figure 2~3
Figure 4
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.