Surge Protection Element with Thermal Expansion Status Indicator
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Solution Overview
Problem
Existing overvoltage protection elements lack effective monitoring and indication of the degradation state of varistors and spark gaps, leading to potential failure during discharge processes, with current methods either requiring active personnel for detection or only measuring maximum current strength without providing clear status information.
Innovation Solution
Incorporating a thermally activatable endothermic material in thermal contact with the overvoltage-limiting components that expands upon heating, causing a measurable change in the status display element, allowing for direct visualization and quantification of the component's degradation, thereby indicating the remaining service life.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If temperature-based disconnection mechanisms are used for varistors, then the varistor can be disconnected when overheated, but the mechanism does not provide information about the degradation state or remaining service life
Solution Approach 1:
The patent implements a feedback mechanism by using an endothermic material that absorbs heat from the varistor and triggers a visual display element. This provides continuous feedback about the thermal history and degradation state of the varistor, allowing users to assess remaining service life while maintaining the disconnection function.
Solution Approach 2:
The endothermic material acts as an intermediary between the varistor and the display element. It converts the thermal energy from the varistor into a mechanical expansion that moves the display element, providing indirect measurement of the varistor's thermal history without direct contact with the varistor itself.
2Reliability
If spark gaps are used for overvoltage protection, then discharge protection is provided, but the condition of the spark gap cannot be monitored and no disconnection mechanism exists
Solution Approach 1:
The patent enables the spark gap to essentially monitor itself through the endothermic material that absorbs heat generated during discharge events. The visual display element provides self-indication of the spark gap's thermal history and operational state without requiring external monitoring equipment or active personnel intervention.
Solution Approach 2:
The patent uses color changes in the display element (or positional changes that can be visually detected) to indicate the thermal history of the spark gap. This provides easy-to-interpret visual feedback about the spark gap's operational state and remaining service life.
3Measurement precision
If magnetization detection methods are used for surge currents, then maximum current strength can be determined, but active personnel intervention is required and only maximum values are detected
Solution Approach 1:
The patent makes the overvoltage protection element self-indicating through the visual display element that automatically responds to thermal events. The element passively shows its operational history and current state without requiring personnel to insert data carriers or perform active measurements, enabling immediate on-site assessment.
Solution Approach 2:
The patent replaces the magnetic detection method with a thermal-mechanical system where heat from the component directly causes expansion of the endothermic material, which mechanically moves the display element. This substitution eliminates the need for magnetic sensors, data carriers, and active reading devices.
4Reliability
If simple temperature switches are used for varistor disconnection, then disconnection occurs at predetermined temperature, but no information is provided about the extent of heating or degradation
Solution Approach 1:
The patent uses the parameter change (expansion) of the endothermic material in response to temperature changes to provide visual indication. The display element's position or color changes correlate with the thermal history of the varistor, providing quantitative information about the extent of heating and degradation while maintaining the disconnection function.
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 and direct method to assess the degradation state of overvoltage protection elements, enabling timely replacement and preventing failures by correlating the expansion of the endothermic material with the energy conversion and heating of the components, thus ensuring effective overvoltage protection.
Implementation Method 1
a thermally activatable endothermic material 6, which is in thermal contact with the overvoltage-limiting component 3
Implementation Method 2
heating of the overvoltage-limiting component 3 above a specific minimum temperature leads to a corresponding expansion of the material 6
Implementation Method 3
the display element performs a change in position due to an expansion of the thermally activatable endothermic material
Data Source
Figure 1
Figure 2
Figure 3a~3b
AI summary
A surge protection element is shown and described, comprising a housing (2), a surge-limiting component (3) arranged in the housing (2), connection elements for electrically connecting the surge protection element (1) to the current or signal path to be protected, and a status indicator (5) with a display element (4) for indicating the status of the surge protection element (1). The surge protection element according to the invention provides a simple indication of the status of the surge protection element.A conclusion about the state of the overvoltage protection element is possible by providing a thermally activatable endothermic material (6) which is in thermal contact with the overvoltage limiting component (3) as well as in mechanical contact with the indicator element (4) of the status indicator (5), wherein when the overvoltage limiting component (3) is heated above a certain minimum temperature, the indicator element (4) undergoes a change in position due to an expansion of the thermally activatable endothermic material (6), the magnitude of which is a measure of the heating of the overvoltage limiting component (3).