Moisture Penetration Detection Using Gas-Generating Pressure Sensing
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Solution Overview
Problem
Existing moisture detection systems for high-voltage components struggle to reliably detect moisture penetration in the form of droplets or humidity due to low conductivity, especially when the moisture is not in direct contact with electrical contacts or measurement spaces, and pressure sensors are inadequate for low liquid quantities.
Innovation Solution
A gas- or pressure-generating element reacts with liquid droplets to create a pressure increase, detected by a sensor through an access opening, using a chemical reaction with a water-soluble coating to prevent aging and enhance detection sensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conductivity-based sensors are used to detect moisture, then detection is possible when water is in direct contact with electrical contacts, but detection fails when moisture is in droplet form or humidity with low conductivity
Solution Approach 1:
The patent replaces the electrical conductivity-based detection system with a pressure-based detection system. When moisture in droplet form contacts the pressure-sensitive membrane, it causes a pressure change that is detected by the pressure sensor, enabling detection of low liquid quantities regardless of electrical conductivity.
Solution Approach 2:
The patent introduces a pressure-sensitive membrane as an intermediary between the moisture and the pressure sensor. The membrane converts the presence of droplet-form moisture into a pressure signal that can be detected, acting as a mediator that enables detection without direct contact between the sensor and the moisture.
2Speed
If pressure sensors are used to detect thermal events, then time-resolved pressure detection is achieved, but detection of low liquid quantities penetrating into unsealed housing is insufficient
Solution Approach 1:
The patent applies local quality by creating a sealed enclosure around the pressure sensor that is selectively permeable to moisture but not to the sensor. This localized structure concentrates the pressure effect of small liquid quantities on the sensor, enhancing detection sensitivity while maintaining the time-resolved detection capability.
Solution Approach 2:
The patent transitions from detecting moisture through electrical conductivity (one-dimensional property) to detecting moisture through pressure changes (another dimensional property). This dimensional change enables detection of droplet-form moisture that does not provide sufficient electrical conductivity signal.
3Measurement precision
If capacitive sensors with dielectric layers are used, then capacitance changes can be measured when liquid impinges on the dielectric layer, but detection requires liquid to be positioned between electrodes
Solution Approach 1:
The pressure sensor system is designed to automatically detect moisture presence through pressure changes without requiring manual positioning or alignment. The sealed enclosure with access openings allows moisture to freely contact the pressure-sensitive membrane, making the system self-service in terms of detection accessibility.
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
Early detection of moisture penetration is achieved, protecting high-voltage components from damage by issuing warnings at low liquid levels, reducing the risk of leakage currents and short circuits.
Implementation Method 1
a gas- or pressure-generating element which causes gas or pressure to develop when it comes into contact with a liquid in droplet form
Implementation Method 2
the gas or pressure sensor recognizes a pressure increase or gas evolution in the envelope element
Implementation Method 3
The coating can dissolve when in contact with liquid substances, in particular water, and thus enable the gas-generating reaction of the gas- or pressure-generating element
Data Source
AI summary
An apparatus for detecting moisture penetrating into a housing having a high-voltage component includes a gas-generating or pressure-generating element which causes gas or pressure to develop when the gas-generating or pressure-generating element contacts a liquid in droplet form. A gas or pressure sensor is arranged with the gas-generating or pressure-generating element in a common envelope element. The gas-generating or pressure-generating element is connected to the housing. The gas or pressure sensor recognizes a pressure increase or gas evolution in the common envelope element and outputs a warning signal.