Dropout Recloser With Visible-Gap Sectionalizing Reclosure
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Solution Overview
Problem
Existing electric transmission and distribution systems lack effective fault detection and isolation capabilities, particularly in self-reclosing devices, which can lead to inefficiencies in fault interruption and restoration, and require improved weather resistance and operational reliability.
Innovation Solution
A self-reclosing dropout recloser device with a trunnion mechanism and bi-stable actuator, integrated within a conventional cutout, that automatically recloses after fault interruption, provides sectionalization with a visible gap, and includes a weather-tight housing with a seal to enhance reliability and durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional recloser design is used, then fault detection and interruption capabilities are provided, but weather resistance and operational reliability are insufficient
Solution Approach 1:
The patent applies a weather-tight seal (flexible sealing mechanism) to the recloser housing to protect internal components from environmental factors such as moisture and corrosion, thereby improving weather resistance and operational reliability without compromising the electrical functionality
Solution Approach 2:
The patent utilizes corrosion-resistant materials (such as stainless steel or specially coated metals) for the housing and internal components, combining structural integrity with weather resistance to enhance durability and reliability in outdoor electrical environments
2Productivity
If self-reclosing mechanism is implemented, then service restoration capability is improved, but fault isolation efficiency deteriorates
Solution Approach 1:
The patent implements a dropout mechanism that physically separates (segments) the recloser from the electrical circuit after a predetermined number of reclosing attempts, creating a visible gap that ensures complete fault isolation while maintaining the ability to restore service to unaffected sections
Solution Approach 2:
The patent employs a dynamic reclosing strategy where the device automatically attempts to reclose multiple times before dropping out, adapting its behavior based on fault conditions to maximize service restoration while ensuring eventual fault isolation
3Volume of moving object
If integrated design within conventional cutout is used, then space utilization is improved, but device complexity increases
Solution Approach 1:
The patent combines multiple functions (fault detection, reclosing control, dropout mechanism, and weather protection) into a single integrated housing unit that fits within conventional cutout dimensions, reducing overall space requirements while managing complexity through functional integration
Solution Approach 2:
The patent designs the recloser to perform multiple functions (protection, reclosing, sectionalization, and environmental protection) within a single device that accommodates conventional cutout dimensions, achieving space efficiency through multi-functionality rather than separate components
Data Source
AI summary
A dropout recloser is capable of in accordance with its operating programming after a predetermined number of fault interrupting operations, e.g., 1, 2, 3 or more but typically 3, to drop out of a cutout and hang freely in a hinge contact of the cutout providing sectionalization with an observable visible gap. The recloser includes fault interrupting and reclosing components, a drop out mechanism and a controller. The drop out mechanism may include a bi-stable actuator to affect fault interrupting operation and dropout operation. The device may include motion limiting structures. The recloser may have a number of operating modes or sequences.