Sliding Contact Rail for Medium Voltage Switching Unit
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Solution Overview
Problem
Existing medium-voltage switchgear systems face challenges in securely grounding voltage transformer connections with minimal effort and space requirements, leading to inefficiencies in structural volume and cost.
Innovation Solution
A sliding contact rail system is implemented, guided by a U-shaped guide part with openings that allow precise movement between a busbar connection and a grounded housing connection, utilizing a leaf spring for secure electrical contact and an actuating lever for easy operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a voltage transformer connection is grounded using conventional fixed grounding components, then reliable grounding is achieved, but the structural volume and space requirements increase
Solution Approach 1:
The patent applies the dynamics principle by replacing fixed grounding components with a movable contact rail that can be displaced between a first position (connected to busbar) and a second position (connected to grounded housing). This dynamic configuration allows the same component to serve multiple functions - both power connection and grounding - thereby reducing the overall structural volume while maintaining reliable grounding when needed.
Solution Approach 2:
The contact rail serves multiple functions: it provides electrical connection to the busbar during normal operation, provides reliable grounding when displaced to the second position, and acts as a movable conductor. This multi-functionality eliminates the need for separate dedicated grounding components, thus reducing the switching unit volume while ensuring grounding reliability.
2Volume of stationary object
If grounding components are minimized to reduce space, then structural volume decreases, but grounding security may be compromised
Solution Approach 1:
The contact rail acts as an intermediary element that mediates between the busbar and the grounded housing. When displaced to the second position, it establishes a secure electrical connection to the grounded housing through the guide part openings, ensuring grounding security is maintained even with minimal grounding components.
Solution Approach 2:
The dynamic displacement of the contact rail to the second position ensures that grounding is established through a deliberate mechanical action rather than a fixed connection, maintaining grounding security while allowing the system to use minimal space when grounding is not required.
3Volume of stationary object
If a sliding contact rail system is implemented, then space requirements are reduced, but the complexity of the switching mechanism increases
Solution Approach 1:
The guide part is segmented with two openings that guide the contact rail's movement. This segmentation provides precise guidance and electrical contact while keeping the overall structure simple and modular, reducing the complexity that would otherwise arise from a more complex switching mechanism.
Solution Approach 2:
The guide part combines multiple functions: it guides the contact rail's movement, provides electrical contact surfaces, and establishes the grounding connection. By merging these functions into a single component, the overall device complexity is reduced despite the dynamic nature of the contact rail.
4Volume of stationary object
If the contact rail is made displaceable to reduce space, then structural volume decreases, but the difficulty of ensuring permanent electrical connection increases
Solution Approach 1:
The guide part openings act as intermediaries that ensure the contact rail maintains permanent electrical connection during displacement. The openings are designed with cross sections that correspond to the contact rail, ensuring continuous contact and reliable electrical connection throughout the movement from the first position to the second position.
Solution Approach 2:
The dynamic displacement of the contact rail through the guide part openings ensures that electrical connection is maintained throughout the movement. The guide part design ensures that the contact rail remains in electrical contact with the busbar or grounded housing depending on its position, making the manufacturing of reliable electrical connections easier despite the dynamic configuration.
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 solution achieves a space-saving design with secure electrical connections, reducing structural volume and costs while ensuring reliable grounding of voltage transformer connections.
Implementation Method 1
the contact bar is pressed against the edges of the openings by a leaf spring
Data Source
AI summary
The electrical switch unit has a contact rail (26), which is guided into a guiding part (23) that is connected with a voltage converter connection (19). The contact rail is moved into two positions, where in former position the contact rail is connected with a busbar (14) and in the latter position the contact rail is connected with an earthed housing (11).