Compact Type H Transmission Structure With Delta Conductor Layout
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Solution Overview
Problem
Conventional electric transmission line support structures require significant height and right-of-way width, leading to increased visual and land impact, higher costs, and limitations in power flow capacity, while also generating strong electric and magnetic fields that may violate regulatory limits.
Innovation Solution
Compact double circuit 345 kV transmission line support structures with a delta configuration of conductor bundles and non-conductive structural strings, reducing phase spacing and EM field strengths, allowing for narrower right-of-way requirements and enhanced power throughput.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional electric transmission line support structures are used, then reliable power transmission is achieved, but visual and land impact increases, right-of-way width increases, and costs increase
Solution Approach 1:
The patent combines two three-phase circuits into a single support structure with a delta configuration, merging conductors from both circuits onto one tower. This consolidation reduces the total number of structures needed and decreases the overall right-of-way width required for power transmission while maintaining reliable operation of both circuits
Solution Approach 2:
The patent transitions from conventional vertical/conical conductor arrangements to a horizontal delta configuration where conductors are arranged in a triangular pattern. This dimensional reorganization optimizes space utilization, reduces the footprint of the support structure, and minimizes the right-of-way width while preserving electrical performance
2Reliability
If conventional support structures with larger phase spacing are used, then flashover prevention is improved, but structure height and right-of-way width increase
Solution Approach 1:
The patent adopts a horizontal delta configuration that distributes conductors across a triangular plane rather than stacking them vertically. This dimensional shift maintains adequate phase spacing for flashover prevention while significantly reducing the vertical height requirement of the support structure
Solution Approach 2:
The patent modifies the geometric parameters of the conductor arrangement by implementing a delta configuration with optimized side lengths and angles. This parameter optimization achieves the necessary electrical clearance for flashover prevention while minimizing the overall dimensions of the support structure
3Productivity
If conventional support structures are used, then power transmission capacity is maintained, but EM field strengths increase and real estate requirements increase
Solution Approach 1:
The patent merges multiple circuits onto a single support structure with compact phase spacing, which consolidates the electromagnetic fields. This merging effect reduces the overall EM field strength in the surrounding environment while maintaining the total power flow capacity of both circuits
Solution Approach 2:
The delta configuration distributes conductors in a horizontal triangular arrangement, spreading the electromagnetic field sources across a wider horizontal area. This spatial distribution reduces the peak EM field strength at any given location while preserving total power transmission capacity
Data Source
AI summary
An electric transmission line support structure. A crossarm depending perpendicularly from a vertical shaft has a first and a second mounting point. A central support depends from the crossarm between the first and the second mounting point. A first conductor bundle is attached to the first mounting point by a first structural string and to the central support by a second structural string. A second conductor bundle is connected to the central support by a third structural string and to the second mounting point by a fourth structural string. A fifth structural string, perpendicular to the crossarm and extending between the first conductor bundle and the second conductor bundle, connects the central mounting point to a third conductor bundle that is further from the crossarm than the first conductor bundle and the second conductor bundle. A sixth structural string connects the vertical shaft to the third conductor bundle.