Rear Terminal Block Assembly Lightning Protection
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Solution Overview
Problem
Gas turbine engine generator terminal block assemblies face challenges in protecting phase terminals from arcing, foreign object debris, and maintaining electrical integrity during lightning strikes at high altitudes, while also requiring improved accessibility for maintenance.
Innovation Solution
A terminal block assembly with transverse terminal surfaces and protrusions, featuring increased width for lightning strike protection, and bus bars connecting terminal studs, fabricated from insulating composite plastic to prevent electrical ground and facilitate easy maintenance access.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the terminal block assembly uses a compact design, then the device complexity is reduced, but the accessibility for maintenance connections deteriorates
Solution Approach 1:
The terminal block assembly is divided into a front terminal block and a rear terminal block, with each serving distinct functions. The rear terminal block specifically provides accessible maintenance connections while the front terminal block handles stator connections, resolving the conflict between compact design and maintenance accessibility.
Solution Approach 2:
The terminal connections are extended from a single-plane configuration to a multi-dimensional arrangement by positioning the rear terminal block at a different spatial location (rearward and laterally displaced), providing accessible maintenance connections without increasing overall device complexity.
2Reliability
If the terminal block assembly provides comprehensive protection from arcing and foreign object debris, then the reliability is improved, but the device complexity increases
Solution Approach 1:
Multiple protective functions are merged into a single integrated rear terminal block assembly that simultaneously provides arcing protection, foreign object debris protection, and lightning strike protection through its structural design, reducing overall device complexity while maintaining comprehensive reliability.
Solution Approach 2:
The rear terminal block assembly acts as an intermediary protective structure between external hazards (lightning, debris, arcing) and the internal electrical components, absorbing and redirecting harmful effects while maintaining electrical integrity.
3Volume of moving object
If the terminal block surfaces are positioned close together, then the device compactness is improved, but the protection from arcing deteriorates
Solution Approach 1:
The terminal surfaces are positioned close together in the radial direction to maintain compactness, while the protrusions extend axially to create localized protective barriers against arcing, achieving both compactness and arcing protection through differentiated spatial arrangement.
Solution Approach 2:
The protection against arcing is achieved by extending protrusions in the axial dimension rather than increasing radial spacing, allowing compact terminal block design while maintaining adequate arcing protection through three-dimensional structural arrangement.
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 shields against arcing and lightning strikes, prevents electrical shorts, and enhances maintenance accessibility by providing a secure and insulated connection system for phase terminals in high-altitude environments.
Implementation Method 1
The terminal block assembly is fabricated from an insulating composite plastic to prevent an electrical ground between the terminal block and the generator housing
Implementation Method 2
One of the terminal surfaces includes an increased width greater than a length of a cable terminal lug for providing a lightening strike barrier
Data Source
AI summary
A disclosed terminal block assembly for a generator includes a terminal block with a base with first and second transverse terminal surfaces adjoining one another. One of the terminal surfaces includes an increased width greater than a length of a cable terminal lug for providing a lightning strike and creepage barrier. The terminal surfaces include spaced apart protrusions extending from the first and second surfaces to provide spaced apart terminal areas overlapping the first and second surfaces. First and second terminal studs are disposed within each corresponding first and second terminal areas and are electrically connected by a bus bar.