Dropout Recloser Using Coil-Based Actuator Position Detection
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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 cost-effective mechanisms to determine actuator positions without additional sensors.
Innovation Solution
A self-reclosing dropout recloser device with a bi-stable electro-magnetic solenoid actuator and a mechanism for determining actuator position using two coils, coupled with a controller for managing fault detection, reclosing, and dropout operations, while ensuring weather-tight sealing and energy dissipation during dropout.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a sensor is added to determine actuator position, then measurement precision is improved, but device complexity and cost increase
Solution Approach 1:
The actuator uses its own coils to determine its position by monitoring current draw characteristics. The controller analyzes the electrical characteristics of the coils already present in the actuator to infer position information, eliminating the need for external sensors and maintaining device simplicity while achieving accurate position determination.
2Reliability
If weather-tight sealing is implemented, then reliability in high-voltage environments is improved, but manufacturing complexity increases
Solution Approach 1:
The patent employs gaskets and sealing elements that conform to the housing and internal components, creating weather-tight barriers without requiring complex manufacturing processes. These flexible sealing components can be installed using standard assembly techniques, balancing protection requirements with manufacturing simplicity.
3Reliability
If dropout mechanism is added for fault isolation, then fault isolation capability is improved, but device complexity increases
Solution Approach 1:
The dropout mechanism utilizes the weight of the recloser unit itself as the counterbalancing force. A pivot mechanism allows the unit to rotate and drop out under its own weight when released, eliminating the need for additional motors or complex actuating systems while providing reliable fault isolation through visible physical separation.
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 recloser device effectively isolates faults, recloses, and drops out in high-voltage environments, providing weather resistance and cost-effective position determination without additional sensors, enhancing operational efficiency and reliability.
Implementation Method 1
a bi-stable electro-magnetic solenoid actuator
Implementation Method 2
a mechanism for determining actuator position using two coils
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.