Dual Actuator Disconnect Switch for Ultrafast Contact Separation
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Solution Overview
Problem
Conventional circuit interrupters have slow interruption times, typically ranging from 30 ms to 85 ms, which is inadequate for rapidly opening gaps in power distribution systems.
Innovation Solution
The implementation of a disconnect switch with a dual actuator system, where a first actuator rapidly moves the movable contact to an initial interruption gap in less than 3 ms, and a second actuator further separates the contacts to create an isolation gap in 20-50 ms, utilizing a Thompson coil actuator and a contact spring mechanism within a vacuum interrupter.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a conventional single actuator system is used, then the device complexity is low, but the interruption time is slow (30-85 ms)
Solution Approach 1:
The patent divides the actuator system into two separate actuators: a first actuator that rapidly opens the contacts to create an initial interruption gap (1-3 mm) in less than 3 ms, and a second actuator that provides additional separation (5-15 mm isolation gap) for complete isolation. This segmentation allows each actuator to be optimized for its specific function, achieving ultrafast interruption while maintaining manageable complexity through functional division.
2Loss of time
If a dual actuator system is implemented, then the interruption time is reduced to less than 3 ms, but the device complexity increases
Solution Approach 1:
The first actuator performs preliminary action by rapidly creating the initial interruption gap (1-3 mm) in less than 3 ms, which is sufficient to interrupt the current flow. The second actuator then provides additional separation to achieve the final isolation gap (5-15 mm). This preliminary action approach ensures ultrafast interruption capability while the second actuator completes the isolation process.
Solution Approach 2:
The system employs dynamic control where the first actuator operates at high speed for rapid initial separation, while the second actuator provides controlled additional movement. The contact spring mechanism dynamically adjusts forces during the opening sequence, providing closing force during closed state and assisting the actuators during opening operation, optimizing performance across different operational phases.
3Speed
If the movable contact is moved rapidly to create a small interruption gap, then the contact separation speed increases, but the force required to move the contact increases
Solution Approach 1:
The contact spring mechanism provides dynamic force optimization: during the closed state, it applies closing force to maintain contact pressure; during opening operation, it assists the actuators by providing additional force in the opening direction. This dynamic behavior reduces the peak force requirements of the actuators while enabling rapid contact separation.
Solution Approach 2:
The contact spring acts as an intermediary mechanical element that stores and releases energy during the opening operation. It is compressed during closing and then expands to provide additional opening force, mediating between the actuators and the movable contact to reduce the direct force requirements on the actuator system.
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 design achieves ultrafast movement, reducing the initial interruption gap to 1-3 mm and the isolation gap to 5-15 mm, significantly improving the speed of contact separation, thereby enhancing the safety and efficiency of power distribution system protection.
Implementation Method 1
utilizing a Thompson coil actuator
Implementation Method 2
a contact spring coupled to the housing and residing between the housing and the second actuator. In operation, during a closed state of the disconnect switch, the contact spring applies a closing force toward the movable main contact
Implementation Method 3
a vacuum interrupter body enclosing the housing; a vacuum chamber provided by the housing, wherein the fixed and moveable main contacts reside in the vacuum chamber
Data Source
AI summary
Disconnect switches include a housing, a fixed main contact in the housing, a movable main contact in the housing in cooperating alignment with the fixed main contact, a first actuator coupled to the movable main contact, and a second actuator coupled to the housing. The second actuator is configured to apply a motive force to the housing that is in a direction opposing a motive force applied by the first actuator to the movable main contact.