Switch Disconnector Drive Using Bistable Spring for Fast C/O Switching
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Solution Overview
Problem
Conventional circuit breakers face issues with arcing and contact wear during high-speed switching of capacitive and inductive currents, leading to transient overvoltages and rapid wear of arcing contacts, limiting their ability to handle load conditions effectively.
Innovation Solution
A drive mechanism utilizing a compression spring-loaded actuating element with a bistable spring assembly, connected to a spindle nut and actuating device, which enables fast and secure switching by leveraging spring force for C or O switching capability, with a rotary actuation system that securely holds the contact pin in end positions and uses a motor-driven spindle gear for efficient switching.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If conventional motor drive is used for circuit breaker, then switching capacity is sufficient, but switching time is too long (approx. 1 second) causing excessive arc duration and contact wear
Solution Approach 1:
The patent applies dynamics by using a compression spring-loaded actuating element that can pivot between stable positions. The spring provides dynamic force to accelerate the switching pin, reducing switching time from 1 second to a much faster operation. The bistable spring assembly dynamically transitions between open and closed positions, enabling rapid switching while maintaining reliable contact engagement through the spring's inherent force.
Solution Approach 2:
The compression spring is pre-loaded to store energy before switching occurs. This preliminary action of pre-compressing the spring allows the system to rapidly deploy stored energy during switching, achieving fast switching speeds without requiring high-power motors during the actual switching event, thereby reducing arc duration and contact wear.
2Reliability
If fast switching is implemented to reduce arc time, then contact wear decreases, but switching capacity for C or O circuits requires special optimization
Solution Approach 1:
The patent changes the fundamental parameter of force delivery by using a compression spring mechanism instead of a motor-driven system. This parameter change enables fast switching by leveraging elastic potential energy, reducing arc duration to minimal levels. The bistable spring assembly provides inherent stability in both open and closed positions, simplifying the control logic while achieving the required switching capacity for C or O circuits.
Solution Approach 2:
The compression spring mechanism is self-actuating through its bistable design. The spring automatically transitions between stable positions once triggered, without requiring complex control systems or continuous power input. This self-service mechanism reduces device complexity by eliminating the need for sophisticated control electronics while maintaining reliable fast switching capability.
3Loss of time
If compression spring mechanism is used to enable fast switching, then switching time is reduced, but manufacturing complexity increases
Solution Approach 1:
The patent segments the switching mechanism into distinct functional components: the compression spring assembly, the pivotable actuating element, and the switching pin. This segmentation allows each component to be manufactured and tested independently using standard machining processes, reducing overall manufacturing complexity despite the sophisticated switching behavior. The modular design facilitates easier assembly and maintenance.
Solution Approach 2:
The compression spring and actuating element are designed as relatively simple mechanical components that can be manufactured cost-effectively using conventional machining. Rather than using expensive motor drives and control electronics, the patent employs simpler mechanical elements that achieve fast switching through physics-based spring energy storage and release, reducing both manufacturing cost and production effort.
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 solution enables a fast-running circuit breaker drive with improved switching behavior, reducing arcing times and contact wear, allowing for efficient switching of high-voltage systems under load conditions while maintaining low effort and cost in production.
Implementation Method 1
a compression spring (14) which is connected in an articulated manner to the actuating element (12) in a common joint (32) and has a spring force which ensures the C or O switching capability of the drive (10)
Implementation Method 2
the actuating element (12) is connected in an articulated manner to the compression spring (14), with the compression spring being formed by a spring assembly which is bistable
Data Source
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AI summary
The invention relates to a drive for a switch disconnector with C or O switching capacity with a switching pin acting as switching contact, with a spindle drive driven by an electric motor and having a spindle nut, wherein an actuating element, which is loaded by a compression spring and is capable of pivoting about a fixed pivot point, is acted upon by the spindle nut, wherein the actuating element for its part interacts with an actuating apparatus which actuates the switching pin.