Circuit Breaker Drive Coupling for Synchronized Multi-Pole Switching
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Solution Overview
Problem
In high-voltage circuit breakers, the transmission of rapid switching movements via a shaft leads to inertia-induced torsion and delays, particularly in multi-pole designs, resulting in asynchronous switching of contacts.
Innovation Solution
A drive unit with a compensating coupling device, such as a spring arrangement, is used to synchronize the motion transmission between actuating elements, compensating for delays and inertia-related issues by allowing adjustable delays through spring elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If a shaft is used to transmit motion between actuating elements spaced apart axially, then the mechanism can transmit motion over distance, but inertia causes shaft torsion and delays motion transmission
Solution Approach 1:
The shaft is divided into multiple sections with different diameters. The first section has a larger diameter to reduce torsion and delay for the first actuating element, while the second section has a smaller diameter for the second actuating element. This segmentation allows each section to be optimized for its specific requirements, reducing overall transmission delay while maintaining the ability to span the required axial distance.
Solution Approach 2:
Different sections of the shaft have different local properties (different diameters) to address local requirements. The first section has increased diameter locally to compensate for torsion delay at that position, while the second section has standard diameter. This local quality adjustment ensures that each actuating element receives motion with appropriate timing characteristics.
2Length of stationary object
If the shaft has sufficient length to reach spaced actuating elements, then motion can be transmitted to all elements, but the transmission delay increases with shaft length
Solution Approach 1:
The shaft is segmented into sections with different diameters rather than using a uniform long shaft. This allows the first section to be optimized for strength and reduced torsion over its length, while the second section can be shorter or have different characteristics, thereby reducing the overall transmission delay despite the total length required to reach spaced actuating elements.
3Speed
If a rigid coupling is used to transmit motion quickly, then transmission speed is high, but inertia causes torsion and asynchrony in multi-pole breakers
Solution Approach 1:
The shaft transitions from a purely rigid structure to a dynamic structure with sections of different flexibility. The first section with larger diameter provides increased stiffness where needed, while the overall segmented design allows for controlled flexibility that accommodates inertial effects. This dynamic design maintains high transmission speed while reducing torsion-induced asynchrony through optimized local rigidity distribution.
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 ensures precise synchronization of switching contact movements across multiple poles, reducing torsional delays and ensuring simultaneous switching operations.
Implementation Method 1
the compensating coupling device comprises a spring arrangement with at least one spring element
Implementation Method 2
a spring element serving as a temporary energy storage device
Implementation Method 3
the problem arises that inertia leads to shaft torsion
Implementation Method 4
a shaft rotatably mounted on the axis for transmitting the movement of the actuating element
Data Source
Figure 1~2
Figure 3~4
Figure 5
AI summary
The invention relates to a drive unit (10) for driving switching contacts of a high-voltage circuit breaker (50), comprising an operating element (12), a plurality of actuating elements (16, 18, 20) for actuating the switching contacts, at least two of which actuating elements (16, 18, 20) are arranged at a distance from one another with respect to an axis (24), and a mechanism (22), in particular lever mechanism, for translating a movement of the operating element (12) into corresponding movements of the actuating elements (16, 18, 20), wherein the mechanism (22) comprises at least one shaft (26), which is rotatably mounted on the axis (24), for translating the movement of the operating element (12) into the corresponding movement of at least one actuating element (18, 20) which is arranged at a distance from the operating element (12) in the axial direction of the axis (24). Provision is made for the drive unit (10) to further have a compensating coupling device (36) for compensating for a delay in the translation of movement between at least two actuating elements (16, 18, 20) from amongst the actuating elements (16, 18, 20) which are arranged at a distance from one another with respect to the axis (24).