Gas Chamber Drying via Cyclic Pressure Cycling
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Solution Overview
Problem
Existing methods for drying gas spaces in high voltage electrical equipment under positive pressure are ineffective in preventing moisture ingress, leading to reduced purity of insulating gases like SF6, and require equipment shutdown and costly retrofitting for moisture adsorption systems.
Innovation Solution
A method involving cyclic partial removal and introduction of dry protective gas, utilizing pressure differences between operating and minimum pressures to shift moisture equilibrium, allowing for continuous operation without structural changes, and an arrangement with connected gas spaces, compressors, and moisture filters to facilitate this process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If adsorbers (aluminum oxide or molecular sieves) are installed in the gas space to prevent moisture ingress, then gas purity is improved, but device complexity and cost increase, and equipment shutdown is required for installation
Solution Approach 1:
The system uses the existing operational characteristics of the gas space (pressure variations during operation) to perform the drying function automatically. The gas space itself serves its dual function of electrical insulation and moisture removal without requiring additional passive components like adsorbers.
Solution Approach 2:
The invention changes the pressure parameter dynamically during operation - reducing pressure below the minimum operating pressure temporarily to create a pressure differential that drives moisture removal, then restoring normal operating pressure. This parameter variation enables moisture control without structural modifications.
2Productivity
If the gas space is operated continuously without shutdown, then productivity is improved, but moisture accumulates in the gas space reducing gas purity
Solution Approach 1:
The invention implements periodic pressure reduction cycles during continuous operation. The pressure is temporarily reduced below the minimum operating pressure at scheduled intervals to remove moisture, then restored to normal operating pressure, allowing continuous operation while periodically maintaining gas purity.
Solution Approach 2:
The drying process is integrated into the continuous operational cycle rather than requiring separate shutdown periods. The pressure reduction for moisture removal is quickly executed and followed by pressure restoration, maintaining continuous useful action with minimal interruption to the primary function.
3Reliability
If pressure reduction is used to remove moisture from the gas space, then gas purity is improved, but the operating pressure drops below minimum required pressure
Solution Approach 1:
The pressure parameter is made dynamic rather than static. The system temporarily reduces pressure below the minimum operating pressure threshold specifically for moisture removal, then actively restores it. This dynamic pressure management allows the system to temporarily violate the minimum pressure constraint for the purpose of maintaining long-term operational reliability.
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
Effectively reduces moisture content in the gas phase, maintaining gas purity and electrical reliability without shutting down equipment or requiring retrofits, by leveraging differential pressures to enhance vapor pressure gradients and transfer moisture from solids to the gas phase.
Implementation Method 1
at least one compressor (3) arranged in the line system (12)
Implementation Method 2
the partial amount V1 of the protective gas (SF6) removed from the gas space (1) is dried by means of at least one drying filter (4)
Implementation Method 3
leveraging differential pressures to enhance vapor pressure gradients and transfer moisture from solids to the gas phase
Data Source
AI summary
The invention relates to a method for drying a chamber comprising a predominantly protective-gas atmosphere in the chamber under positive pressure, which has an operating pressure p1 and a predetermined minimum pressure pmin, wherein the minimum pressure pmin of the gas chamber is monitored and the operating pressure p1 is greater than the minimum pressure pmin, wherein the method comprises the following steps: a) removing of a partial quantity Vi of the protective gas from the chamber, wherein the partial quantity Vi is equivalent to the pressure differential Δp, which is smaller or equal to the differential between p1 and pmin, b) introducing a partial quantity V2 of a dry or dried protective gas into the gas chamber up to a gas pressure p2, which is greater than pmin and c) repeating method steps a) and b) after a predetermined waiting time Δt. The invention further relates to an arrangement for carrying out the method.