Multi-Transformer Pole Bracket With Adjustable Seismic Bracing
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Solution Overview
Problem
Current cluster brackets used in electrical power distribution systems are prone to catastrophic failure due to static weight loading and seismic events, which can cause deformation and failure of mounting bolts, leading to potential damage and disruption of power supply.
Innovation Solution
A seismic-resistant multi-transformer cluster bracket with adjustable-span diagonal braces and reinforced structural features, including U-shaped channel sections, strong-back struts, and safety mount brackets, is designed to securely attach and support multiple transformers on a power pole, minimizing deformation and failure risks during seismic events.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If heavy transformers are mounted on a cluster bracket, then power distribution capability is improved, but mounting bolts are subjected to excessive static weight loading causing deformation and potential failure
Solution Approach 1:
The patent transitions from single vertical support to a three-dimensional bracing system by adding diagonal braces that extend from the upper crossbeam to the lower crossbeam. This spatial distribution of support forces across multiple dimensions reduces the load concentration on individual mounting bolts while maintaining the ability to support heavy transformers.
Solution Approach 2:
The cluster bracket is segmented into multiple structural components (upper crossbeam, lower crossbeam, vertical posts, diagonal braces) that independently bear and distribute portions of the transformer weight. This segmentation allows the load to be distributed across multiple mounting points and structural elements rather than concentrating force on a single mounting bolt assembly.
2Reliability
If cluster brackets are subjected to seismic events, then power distribution continuity deteriorates due to catastrophic failure, but adding seismic resistance features increases structural complexity
Solution Approach 1:
The diagonal braces are designed with hinged connections at their endpoints, allowing them to dynamically adjust and absorb seismic forces through controlled movement rather than rigid resistance. This dynamic capability enables the structure to withstand seismic events while maintaining relatively simple construction compared to fully rigid bracing systems.
Solution Approach 2:
The diagonal brace configuration creates a pre-tensioned triangular bracing system that is designed to absorb and dissipate seismic energy before it can cause catastrophic failure. The braces act as energy-absorbing elements that protect the main structural components and mounting bolts from extreme seismic loads.
3Strength
If diagonal braces are added to resist seismic forces, then resistance to dynamic deformation is improved, but manufacturing and installation complexity increases
Solution Approach 1:
The hinged connections at the diagonal brace endpoints enable simple pin-type joints that are straightforward to manufacture and install. These hinges allow the braces to be attached without complex welding or rigid fastening, reducing manufacturing complexity while maintaining seismic resistance through the dynamic bracing action.
Solution Approach 2:
The diagonal braces serve multiple functions: they provide seismic resistance, add structural rigidity, and distribute loads across the cluster bracket assembly. This multi-functionality justifies the additional components by delivering multiple benefits from a single structural feature, effectively reducing the overall complexity burden.
4Ease of operation
If mounting bolts are used to attach cluster brackets to poles, then installation simplicity is improved, but the bolts are prone to stretching and bending under static and dynamic loads
Solution Approach 1:
The diagonal braces add a diagonal dimension to the support system, distributing mounting forces across multiple directions and attachment points. This multi-directional load distribution reduces the stretching and bending stresses on individual vertical mounting bolts while maintaining simple bolt-based attachment methodology.
Solution Approach 2:
The mounting system is segmented into multiple attachment points distributed across the upper and lower crossbeams and vertical posts. This segmentation distributes the total load across numerous bolts rather than concentrating force on a few critical mounting points, reducing the stress on each individual bolt while maintaining installation simplicity.
Data Source
AI summary
A seismic resistant cluster bracket for mounting to an electrical power-line pole and supporting power distribution transformers includes a rectangular support frame which has upper and lower horizontal cross beams secured to left, right, and center vertical strong-back struts. Pole-mount brackets protruding rearward from the center strong-back are provided with bolt holes for receiving bolts to attach the support frame to a power pole. Top and bottom safety mount brackets, each having vertical stabilizer ribs for engaging indentations of a rear transformer bracket are attached to the front of each strong-back. A pair of adjustable extension length diagonal braces spaced equal distances laterally outwards from the center strong-back are pivotal mounted to the rear side of the support frame, extendable to adjustable lengths and boltable to a power pole to secure the frame against movements relative to the power pole as a result of static weight loading or seismic vibrations.