Dropout Recloser With Bi-Stable Actuator and Visible Isolation
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Solution Overview
Problem
Existing fault detection and reclosing devices in electric transmission and distribution systems face challenges in providing efficient fault isolation and protection, particularly in high-voltage environments, with a need for improved weather resistance and simplified position detection mechanisms.
Innovation Solution
A self-reclosing dropout recloser device with a bi-stable actuator and dropout mechanism, utilizing a trunnion system for fault interruption and reclosing, and a sealed housing for weather resistance, along with a two-coil position detection method to determine actuator position without additional sensors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional fault detection and reclosing devices are used in high-voltage environments, then fault isolation and protection functions are provided, but weather resistance is insufficient
Solution Approach 1:
The patent employs a sealed housing design that encapsulates the recloser device, protecting internal components from environmental factors such as moisture, dust, and extreme temperatures. The housing acts as a protective barrier while maintaining the device's operational integrity in harsh weather conditions.
2Measurement precision
If additional sensors are added for position detection, then position detection accuracy is improved, but device complexity increases
Solution Approach 1:
The patent utilizes the bi-stable actuator's inherent mechanical characteristics to provide position detection without requiring external sensors. The actuator's own physical state (positioned or dropped) serves as the detection mechanism, eliminating the need for additional sensing components and reducing overall device complexity.
Solution Approach 2:
The patent replaces electronic sensor-based position detection with a mechanical detection method. The controller detects the actuator's position by monitoring mechanical signals or states directly from the actuator's physical configuration, substituting complex electronic sensing with simpler mechanical indication.
3Reliability
If a bi-stable actuator with dropout mechanism is used, then fault interruption and reclosing reliability is improved, but device complexity increases
Solution Approach 1:
The patent integrates the dropout mechanism directly into the bi-stable actuator structure, combining fault interruption and reclosing functions within a single integrated component. This merging of functions reduces the number of separate components needed while maintaining the reliability benefits of the bi-stable mechanism.
Solution Approach 2:
The bi-stable actuator serves multiple functions: it provides fault interruption, enables reclosing operations, and offers position detection capabilities. This multi-functionality reduces the need for separate dedicated components for each function, thereby managing device complexity while improving overall system reliability.
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.