Composite Cross Arm Structure for Power Transmission Lines
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing high-voltage transmission towers made of steel are heavy, prone to rust and cracking, and have poor performance at low temperatures, with difficulties in construction, transportation, and maintenance, and require extensive space due to wind loads, while composite insulating towers lack sufficient support for high-voltage lines.
Innovation Solution
A composite cross arm structure featuring V-shaped hollow insulators and oblique-pulling insulators, with adjustable angles and auxiliary components, provides stable support for high-voltage transmission lines, reducing the need for long suspension insulators and minimizing the tower's footprint.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a steel cross arm is used to support transmission lines, then the mechanical strength and support capability are sufficient, but the weight is heavy and the structure is prone to rust and cracking
Solution Approach 1:
The patent applies composite materials by replacing traditional steel cross arms with composite material cross arms that combine high-strength fibers (such as glass fiber or carbon fiber) embedded in a polymer matrix. This composite structure provides sufficient mechanical strength to support transmission lines while significantly reducing the weight compared to all-steel structures, directly resolving the contradiction between strength and weight.
2Reliability
If the cross arm length is increased to account for wind yaw angle, then the air gap between transmission line and tower body is maintained, but the width of the transmission line corridor and floor space increase
Solution Approach 1:
The patent applies dynamics by replacing rigid steel cross arms with flexible composite material cross arms that can dynamically adjust their position and orientation in response to wind loads. This flexibility allows the cross arm to accommodate wind yaw angles without requiring excessive length, thereby maintaining the required air gap while minimizing the increase in corridor width and floor space.
3Weight of stationary object
If a single insulation rod is used as the cross arm in composite towers, then the weight and space are reduced, but the support capability for high voltage transmission lines is insufficient
Solution Approach 1:
The patent applies segmentation by dividing the cross arm structure into multiple composite insulation rods arranged in a bundled configuration. Instead of using a single thick insulation rod, multiple smaller rods work together to provide the necessary mechanical strength and support capability for high voltage transmission lines, while maintaining the weight and space advantages of composite materials.
Solution Approach 2:
The patent applies merging by combining multiple composite insulation rods into a unified cross arm assembly. The individual rods are bundled and connected to form a composite structure that collectively provides sufficient mechanical strength and support capability, effectively merging the functionality of multiple elements into a single structural unit that meets the requirements for high voltage transmission line support.
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
The present invention relates to the field of power transmission tower, and a composite cross arm structure of a composite tower for power grid transmission line is provided, including two sets of cross arm insulators arranged into a V-shaped arrangement horizontally, wherein a first end of each of the two sets of cross arm insulators is connected to the tower body of the composite tower at opening of the V-shaped arrangement; and a set of oblique-pulling insulators corresponding to each of the sets of cross arm insulators respectively, one end of which is connected to a second end of each of the two sets of cross arm insulators at apex of the V-shaped arrangement, and the other end of which is connected to the tower body over the two sets of cross arm insulators. The composite cross arm structure is constituted by the sets of cross arm insulators and the set of oblique-pulling insulators in a V-shaped triangular structure, so the composite cross arm structure is stable, capable of bearing high pressure, and can be used to suspend high voltage power transmission line. A composite tower for power grid transmission line with the above a composite cross arm structure is also provided.