Current Transformer Short-Circuit Bridge With Spring Actuation
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Solution Overview
Problem
Existing power converter designs with short-circuit bridges are complex and can be stiff to rotate, making it difficult to switch between open and short-circuit positions safely and efficiently.
Innovation Solution
A power converter with a short-circuit bridge made of a spring that relaxes in the open position and tensions in the short-circuit position, allowing for simplified movement between the two positions and ensuring secure short-circuiting of secondary connections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a traditional short-circuit bridge mechanism is used with a housing cover that rotates to engage with a central coupling, then the secondary terminals can be short-circuited, but the structure becomes complex and rotation becomes difficult when screws are tightened or contaminants create resistance
Solution Approach 1:
The patent extracts the short-circuit bridge from the rotating housing cover mechanism and makes it an independent component that moves linearly along the axis of the current transformer. This separates the short-circuiting function from the cover rotation, simplifying the overall structure while maintaining reliable short-circuiting capability.
Solution Approach 2:
The housing cover is divided into a first cover portion that rotates to open/close the housing, and a second cover portion that moves linearly to control the short-circuit bridge. This segmentation allows independent control of the housing access and the short-circuiting function, reducing mechanical complexity and interference.
2Reliability
If a traditional short-circuit bridge mechanism with central coupling is used, then the secondary terminals can be short-circuited, but the rotation becomes stiff and difficult to operate
Solution Approach 1:
The short-circuit bridge is designed to move dynamically along the axis of the current transformer in response to the linear movement of the second cover portion. This dynamic linear movement replaces the stiff rotational movement of traditional mechanisms, making operation easier while ensuring reliable contact between the short-circuit bridge and secondary terminals.
3Reliability
If the short-circuit bridge is integrated with a rotating housing cover, then short-circuiting can be achieved, but the mechanism requires precise rotational alignment and is sensitive to tight screws and contaminants
Solution Approach 1:
Instead of rotating the short-circuit bridge into position (traditional approach), the patent inverts the approach by having the short-circuit bridge move linearly along the axis. The second cover portion translates rotational motion into linear motion that directly actuates the short-circuit bridge, simplifying assembly and reducing sensitivity to alignment tolerances.
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 simplifies the mechanism for switching between open and short-circuit positions, preventing stubbornness and ensuring high security by forcing a coupled movement between the cover and the short-circuit bridge.
Implementation Method 1
the short-circuit bridge and the cover are designed such that when the cover is moved to its open position, the short-circuit bridge is moved to the short-circuit position
Implementation Method 2
the cover displacement can cause the rotation of a rotary cam, which, through displacement or rotation, causes the short-circuit bridge to assume the short-circuit position
Implementation Method 3
if the short-circuiting bridge is a spring which is relaxed in the open position and tensioned in the short-circuit position, or vice versa, i.e. alternatively tensioned in the open position and relaxed in the short-circuiting position
Data Source
Figure 1(A)~1(C)
Figure 2(A)~2(C)
Figure 3
AI summary
The invention relates to a current transformer with a primary circuit coupling and a secondary circuit, as well as with an integrated short-circuit bridge, wherein the short-circuit bridge is adjustable between a short-circuited position and an open position, such that the secondary terminals of the secondary circuit are conductively connected to one another via the short-circuit bridge in the short-circuited position, wherein the short-circuit bridge is a spring that is relaxed in the open position and tensioned in the short-circuited position, or which is tensioned in the open position and relaxed in the short-circuited position. The invention also relates to a generic current transformer that has a cover which covers the secondary terminals in the operating state and which is displaceable, in particular rotatable, so that the secondary terminals are exposed in an open position.