Water-Concentration Detection Device with Pre-Drying Gas Chamber
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Solution Overview
Problem
Conventional water-concentration detection devices in gas-insulated devices take a long time to reach equilibrium and provide measurement results due to significant differences in water concentration between the device and atmospheric environments, leading to delayed detection of water concentration in insulating gases.
Innovation Solution
A water-concentration detection device with a gas chamber, porous electrodes, a hydrogen-ion conductive solid electrolyte membrane, an impedance measurement unit, and a drying unit that removes water from the atmosphere before measurement, allowing for rapid equilibrium and accurate detection of water concentration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the water sensor is exposed to atmospheric environment before measurement, then the solid electrolyte membrane reaches equilibrium with atmospheric water concentration, but it takes a considerably long time (few hours to few days) to reach equilibrium with the low water concentration in the gas-insulated device
Solution Approach 1:
The drying unit removes water from the atmosphere in the gas chamber before the insulating gas is introduced, pre-conditioning the environment to match the target measurement conditions. This preliminary action prevents the solid electrolyte membrane from needing to undergo a long equilibrium transition from high atmospheric humidity to low gas-insulated device humidity, thereby reducing measurement time while maintaining accuracy
2Reliability
If the solid electrolyte membrane is in equilibrium with atmospheric water concentration (several tens of thousands of ppm), then the sensor is ready for measurement, but the AC impedance increases exponentially to 1 megaohm or higher when measuring low water concentration (several tens to hundreds of ppm), making measurement difficult
Solution Approach 1:
The drying unit pre-conditions the gas chamber environment by removing water before introducing the insulating gas. This ensures the solid electrolyte membrane starts from a low-humidity state, preventing the exponential increase in AC impedance that would occur when transitioning from high atmospheric humidity to low measurement humidity, thereby facilitating accurate measurement
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 quick detection of water concentration in insulating gases by reducing the time required for the solid electrolyte membrane to reach equilibrium, facilitating prompt measurement results.
Implementation Method 1
a solid electrolyte membrane that is hydrogen-ion conductive and is held between and fixedly attached to the electrodes
Implementation Method 2
a drying unit that removes water from an atmosphere in the gas chamber before the insulating gas is introduced into the gas chamber
Data Source
AI summary
A water-concentration detection device is configured to detect a water concentration of insulating gas filled in a gas-insulated device. The water-concentration detection device includes: a gas chamber in which the insulating gas introduced from the gas-insulated device is enclosed; electrodes that are porous and are arranged to face each other within the gas chamber; a solid electrolyte membrane that is hydrogen-ion conductive and is held between and fixedly attached to the electrodes; an impedance measurement unit that measures an alternating-current impedance between the electrodes by applying an alternating-current voltage to the electrodes; a water-concentration detection unit that detects the water concentration of the insulating gas based on the alternating-current impedance measured by the impedance measurement unit; and a drying unit that removes water from an atmosphere in the gas chamber before the insulating gas is introduced into the gas chamber from the gas-insulated device.