Transfer Assembly Delay Mechanism for Medium-Voltage Switchgear
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Solution Overview
Problem
Existing transmission assemblies for coupling a fuse trip to a drive of a switching device in medium-voltage switchgear require a delay in switching processes due to residual direct current components, but existing solutions are complex and costly.
Innovation Solution
A transmission assembly using a first lever coupled to the fuse release, a weight element, and a second lever actuated by the weight element's force, with a pawl arrangement and spring mechanism to achieve delayed triggering, allowing for adjustable delay times through weight and spring force adjustments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If a torque wheel with mass is used to delay the rotary movement of the shaft, then the switching process is delayed, but the device complexity increases
Solution Approach 1:
The patent changes the fundamental parameter of the delay mechanism from rotational inertia (torque wheel mass) to gravitational potential energy (falling weight). By changing the physical principle and parameters used for delay, the system achieves the same time delay function with a simpler, more intuitive mechanical structure that doesn't require complex rotational components.
Solution Approach 2:
The patent extracts the delay function from the rotational shaft system and implements it separately through a vertical falling weight mechanism. This separation allows the delay function to be achieved independently without adding complexity to the rotational transmission system, using a dedicated gravitational delay mechanism instead.
2Loss of time
If a torque wheel with mass is used to delay the rotary movement, then delayed switching is achieved, but the manufacturing cost increases
Solution Approach 1:
The patent replaces the expensive rotational inertia-based delay mechanism with a simpler gravitational potential energy-based system. By changing the physical principle from rotational dynamics to gravitational mechanics, the manufacturing cost is reduced as the falling weight and guide rail system is easier and cheaper to manufacture than precision rotational delay mechanisms.
Solution Approach 2:
The patent uses a simple falling weight that can be easily replaced or adjusted, rather than a complex torque wheel assembly. This approach favors simpler, cheaper components that can be manufactured more economically, even if they need to be replaced periodically, reducing overall system cost.
3Adaptability or versatility
If the weight element moves vertically between positions, then the delay time is adjustable, but the mechanism complexity increases
Solution Approach 1:
The patent segments the delay mechanism into distinct functional components: the falling weight for time delay, the pawl-ratchet arrangement for one-way motion control, and the lever system for actuation. This segmentation allows each component to be simple in itself while providing overall adjustability and versatility through their coordinated operation.
Solution Approach 2:
The patent introduces a pawl-ratchet arrangement as an intermediary mechanism between the falling weight and the drive shaft. This intermediary component simplifies the overall system by providing a straightforward one-way motion transmission that naturally controls the delay timing without requiring complex feedback or control mechanisms.
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 provides a simple, cost-effective means to delay the switching process, enabling safe operation by allowing decay of the direct current component before switching, with visual and electrical status reporting capabilities.
Implementation Method 1
the weight element being transferrable into its second position by means of its weight and a force acting on the weight element from a first spring
Implementation Method 2
a force acting on the weight element from a first spring
Data Source
Figure 1
Figure 2
AI summary
In order to form a transfer assembly with a simple and cost-effective structure for coupling a protection device triggering mechanism to a drive of a switching device with delaying means for delayed triggering of the switching process for the switching device when the protection device has triggered, it is proposed that the delaying means has a first lever (2), which is coupled to the protection device triggering mechanism and locks a weight element (4), which can be moved vertically between a first and a second position, in the first position via a latch arrangement (5, 6) and releases it when the protection device triggers, and a second lever (3), which is provided in order to actuate the drive and which can be actuated by the weight element (4); the weight element (4) can be transferred into its second position by means of the weight force thereof and a force exerted onto the weight element (4) by a first spring (8).