DC Two-Phase Conductor Replacement Without Phase Transposition
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Solution Overview
Problem
Existing methods for maintaining high-voltage power transmission lines require power interruption or result in illegal transposition of phase conductors, leading to voltage and current fluctuations and potential disruptions.
Innovation Solution
A method for maintaining high-voltage power transmission lines by relocating and replacing conductors without interrupting power supply, using auxiliary supports and transfer buses to maintain equal potential zones and avoid transposition of phases.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If power is shut off to perform maintenance on high-voltage transmission lines, then maintenance work can be performed safely, but power delivery to customers is disrupted
Solution Approach 1:
The patent introduces temporary support structures and transfer buses as intermediary elements that enable maintenance work on energized conductors. The temporary supports allow workers to access and replace conductor sections while the line remains energized, and transfer buses facilitate the redirection of electrical current around the work zone, eliminating the need for power shutdowns while maintaining safety
Solution Approach 2:
The patent employs preliminary actions by pre-positioning temporary support structures and transfer buses before maintenance begins, and by systematically relocating conductors to temporary positions in advance. This preparation allows the maintenance to proceed on energized lines without disrupting power delivery, as the infrastructure is already in place to support both the workers and the electrical current
2Productivity
If conductors are moved to temporary positions simultaneously, then maintenance can proceed, but transposition of phase conductors occurs causing voltage and current fluctuations
Solution Approach 1:
The patent divides the maintenance process into sequential segments, handling one phase conductor at a time rather than moving all three phases simultaneously. This segmentation prevents transposition by maintaining the relative positional relationships between phases, thereby avoiding voltage and current fluctuations while still enabling maintenance to proceed efficiently
Solution Approach 2:
The patent employs dynamic adjustment of conductor positions and temporary support placements to maintain proper phase relationships. By dynamically coordinating the movement and positioning of conductors during maintenance, the system prevents illegal transpositions and ensures voltage and current stability throughout the maintenance process
3Ease of operation
If long jumper cables are used to connect temporarily relocated conductors, then conductors can be moved to temporary positions, but illegal transposition occurs requiring jumper cables to cross over other phase conductors
Solution Approach 1:
The patent resolves the jumper cable crossing problem by utilizing the vertical dimension and spatial arrangement around the support structures. Instead of having jumper cables cross horizontally over other phases (which causes transposition), the system routes cables through vertical pathways and uses multiple levels on temporary supports, maintaining proper phase separation while enabling conductor relocation
Data Source
AI summary
The present invention relates to replacing conductors in a high-voltage power transfer system. The method provides, for example, a method for maintaining sections of electrically conductive phases in a direct current (DC) two phase power conductor line, wherein the two phases are parallel and spaced apart. The phases are strung between support structures and supported above the ground. Maintenance work, which include replacement or repair, is performed on sections of the two phases without interrupting a power load in any one of the three phases and without transposing the relative positions of the phases.