Pyro Fuse Busbar Break Design for Compact Arc Isolation
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Solution Overview
Problem
Conventional electrical disconnects are inadequate for high-power and high-voltage applications, as they are often heavy, large, and susceptible to electrical arcing, and lack effective onboard control systems, which poses challenges in mobile and complex electrical systems.
Innovation Solution
The development of an electrical disconnect with a pyrotechnic initiator and a unique busbar configuration that includes a break section with a reduced thickness, a ceramic blade, and a plunger mechanism, which ensures complete severing and insulation of busbar segments, along with an activation circuit for overcurrent detection and external management system integration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional electrical disconnects are used for high-power and high-voltage applications, then they can provide basic disconnection function, but they become heavy and large in size
Solution Approach 1:
The busbar is segmented into multiple sections with a break section that has reduced thickness. This segmentation allows the disconnect to sever the busbar into isolated segments, achieving reliable disconnection while reducing the overall mass of the busbar structure compared to conventional solid busbars.
Solution Approach 2:
The break section of the busbar has a thickness parameter that is specifically reduced compared to other sections. This parameter change (reduced thickness) enables the blade to effectively sever the busbar while minimizing the material used and overall weight of the disconnect assembly.
2Reliability
If conventional electrical disconnects are used for high-power and high-voltage applications, then they can provide basic disconnection function, but they become large in size
Solution Approach 1:
The blade is positioned at an angle relative to the busbar break section rather than perpendicular. This angular positioning optimizes the severing action within a compact space, allowing effective disconnection in a smaller footprint area compared to conventional perpendicular blade arrangements.
Solution Approach 2:
The break section thickness is reduced to enable effective severing with a more compact blade design. This parameter change allows the disconnect mechanism to operate within a smaller overall footprint while maintaining reliable disconnection capability.
3Reliability
If conventional electrical disconnects are used, then they can provide basic protection, but they are susceptible to electrical arcing
Solution Approach 1:
The pyrotechnic initiator replaces conventional mechanical actuation mechanisms. When activated, it generates a controlled explosive force that drives the blade to sever the busbar rapidly and cleanly, minimizing the time for arc formation and reducing electrical arcing compared to slower mechanical operation.
Solution Approach 2:
The busbar is designed with a break section that segments the electrical path. This segmentation creates a predetermined weak point that facilitates clean severing, reducing the likelihood of sustained electrical arcing between busbar segments during disconnection.
4Reliability
If conventional electrical disconnects are used, then they can provide basic disconnection, but they lack effective onboard control systems
Solution Approach 1:
The disconnect incorporates onboard overcurrent detection capability that automatically triggers the pyrotechnic initiator when fault conditions are detected. This self-service control system eliminates the need for external control complexity while ensuring reliable disconnection under fault conditions.
Solution Approach 2:
The control system integrates multiple functions including overcurrent detection, signal reception from external management systems, and pyrotechnic initiator control into a single unified system. This multi-functionality provides effective onboard control without proportionally increasing device complexity.
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
This solution provides improved insulation and reduced size and weight, minimizing arcing and enabling effective operation in constrained spaces, while ensuring reliable disconnection in high-voltage applications.
Implementation Method 1
pyrotechnic initiator disposed within the housing
Data Source
AI summary
Exemplary electrical disconnects may include a housing defining a first access at a first end of the housing and a second access at a second end of the housing. The second access may extend vertically along a height of the housing beyond a vertical location of the first access. The electrical disconnects may include a busbar characterized by a first segment and a second segment. The first segment and the second segment may be coupled at a break section of the busbar. The first segment of the busbar may extend through the first access of the housing. The second segment of the busbar may extend through the second access of the housing. The electrical disconnects may include a pyrotechnic initiator disposed within the housing. The electrical disconnects may include a blade laterally aligned with the break section of the busbar. The electrical disconnects may include a plunger within which the blade is seated.