Capacitor Can Bottom Pressure Sensing Without Internal Sensors
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Solution Overview
Problem
Existing capacitor protection systems face issues with impedance problems and increased manufacturing costs due to the use of overpressure switches or sensors within the capacitor, which can disrupt the internal structure and increase costs, particularly in power electronic and railway applications.
Innovation Solution
A cylindrical capacitor can design with a deformable can bottom and an external sensor system, utilizing a plate-shaped switching device with hinge-like tongues and conductor tracks that separate upon pressure increase, allowing safe error signaling without altering the internal structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If overpressure switches or sensors are placed inside the capacitor, then pressure detection is achieved, but impedance problems and manufacturing costs increase
Solution Approach 1:
The sensor system is extracted from the interior of the capacitor and relocated to the exterior. The can bottom is made deformable under pressure, and this deformation is detected by sensors positioned outside the capacitor, eliminating the need for internal sensors that cause impedance problems and complexity.
Solution Approach 2:
The can bottom acts as an intermediary element that transmits internal pressure information to external sensors. Instead of placing sensors directly inside, the can bottom deforms in response to internal pressure, and this deformation serves as the signal for external sensors to detect the pressure condition.
2Reliability
If internal sensors are used for pressure detection, then error detection capability is improved, but manufacturing costs increase
Solution Approach 1:
The sensor system is extracted from the interior of the capacitor and relocated to the exterior. The can bottom is made deformable under pressure, and this deformation is detected by sensors positioned outside the capacitor, eliminating the need for internal sensors that cause impedance problems and complexity.
3Reliability
If internal pressure sensors are installed, then pressure monitoring is achieved, but the internal structure is disrupted
Solution Approach 1:
The sensor system is extracted from the interior of the capacitor and relocated to the exterior. The can bottom is made deformable under pressure, and this deformation is detected by sensors positioned outside the capacitor, eliminating the need for internal sensors that cause impedance problems and complexity.
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
Enables reliable error detection and safe shutdown of capacitors without disrupting the internal structure or increasing manufacturing costs, suitable for power electronic and railway applications, adhering to mechanical standards like IEC 61373.
Implementation Method 1
when the internal pressure rises above a target value, the can bottom is subjected to deformation which is detectable by a sensor system
Implementation Method 2
the can bottom is subjected to deformation which may be detected by a sensor system
Implementation Method 3
A pin-like or bolt-like protrusion extends from the bottom external side of the can bottom towards the tongue of the plate-shaped substrate, which protrusion exerts an actuating force upon the tongue when the internal pressure rises
Implementation Method 4
At least one of the conductor tracks is installed so as to extend across a predetermined breaking portion of the tongue in such a manner that when the tongue is deviated, the corresponding conductor track is separated and an electricity circuit formed while utilizing the connection points is interrupted
Data Source
AI summary
The invention relates to an electrical capacitor having a capacitor can, consisting of a can envelope and a can bottom, wherein the can bottom, when an internal pressure increases above a target value, is subjected to deformation which may be detected by a sensor system. For this purpose, the sensor system gets in operative connection with a bottom external side of the can bottom. The sensor system is configured as a plate-shaped switching device in the form of hinge-like tongues formed on a substrate, wherein conductor tracks located on the substrate are separated when the tongue/s is/are deviated.