Capacitor Dual Pressure Interrupter Mechanism
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Solution Overview
Problem
Existing capacitors with pressure interrupters often fail to disconnect all electrical connections to the terminals during internal faults, especially when mounting brackets or structural members restrict the expansion of the capacitor cover or housing, leading to potential rupture and venting risks.
Innovation Solution
A capacitor design featuring a sealed case with dual pressure interrupter mechanisms, where the receptacle expands axially and the cover expands outwardly, ensuring all electrical connections to the terminals are broken simultaneously, regardless of the expansion direction, using a flexible cover and a plate that anchors the connections to be broken when the distance between the cover and plate increases.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single pressure interrupter mechanism is used, then the device complexity is reduced, but the reliability is insufficient because not all electrical connections are disconnected during internal faults
Solution Approach 1:
The pressure interrupter mechanism is segmented into two independent components: a first pressure interrupter that responds to radial expansion of the capacitor housing, and a second pressure interrupter that responds to axial expansion. Each segment targets a different expansion direction, ensuring comprehensive disconnection of all electrical connections regardless of the primary expansion mode during internal faults.
Solution Approach 2:
The pressure interrupters utilize dynamic response mechanisms where the first interrupter activates when radial expansion exceeds a first threshold, and the second interrupter activates when axial expansion exceeds a second threshold. This dynamic, multi-threshold approach ensures that at least one interrupter will activate under any fault condition, improving reliability without requiring both to be simultaneously complex.
2Ease of operation
If mounting brackets or structural members are used to secure the capacitor, then the ease of operation and installation is improved, but the reliability deteriorates because these structures restrict the expansion of the capacitor cover or housing, preventing the pressure interrupter from functioning
Solution Approach 1:
The expansion response is segmented into two independent directions: radial expansion (handled by the first pressure interrupter) and axial expansion (handled by the second pressure interrupter). This segmentation ensures that even if mounting brackets restrict one direction of expansion, the other direction remains free to activate its corresponding pressure interrupter, maintaining reliability while allowing flexible installation configurations.
Solution Approach 2:
The system monitors and responds to changes in expansion parameters in multiple dimensions. By setting different threshold values for radial and axial expansion and providing separate interrupter mechanisms for each direction, the system can detect and respond to pressure buildup even when mounting constraints limit expansion in certain directions, thus maintaining reliability while accommodating various installation methods.
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 design effectively disconnects all electrical connections to the terminals during internal faults, reducing the risk of rupture and venting by ensuring comprehensive disconnection, even in constrained installations, and is adaptable to various capacitor types and configurations.
Implementation Method 1
An increase in pressure within the case, for example, when an internal fault occurs, forces and the receptacle to extend longitudinally
Implementation Method 2
A second pressure interrupter mechanism may be conveniently provided in the capacitor, by providing a flexible cover that expands outwardly, that is, axially away from the open end of the receptacle, under pressure
Data Source
AI summary
A capacitor is provided with a case having a receptacle with an expandable section that allows the receptacle to extend axially when internal pressure builds within the case as a result of a fault. Terminals are mounted on the cover and electrically connected to the electrodes of a capacitor element through an interrupter plate, via leads. The plate is attached to the section of the case that extends under pressure, whereby the plate is drawn away from the cover, thereby breaking the electrical connections to the terminal. The plate may also work in conjunction with a cover that expands outward in response to internal pressure, to provide a second pressure interrupter mechanism.