Insulating Gas Receptacle Heating to Prevent Low-Temperature Liquefaction
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Solution Overview
Problem
In medium- and high-voltage electrical devices, insulating gas mixtures like SF6 and heptafluoroisobutyronitrile can liquefy at low temperatures, leading to decreased isolation properties and requiring inefficient and energy-intensive heating of the entire device to maintain gas composition.
Innovation Solution
A sealed chamber with a receptacle for collecting liquefied gas and a heating element specifically for the receptacle, combined with a dielectrically and thermally insulating layer to minimize energy consumption by only heating the liquefied gas, along with temperature and pressure sensors to modulate heating.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the entire electrical device is heated to prevent gas liquefaction, then the insulating gas composition is maintained, but energy consumption increases substantially
Solution Approach 1:
The heating system is segmented into a localized heating element that only heats the receptacle containing liquefied gas, rather than heating the entire electrical device. This segmentation allows energy to be applied only where needed (in the receptacle) to vaporize the liquid gas and maintain proper gas composition, significantly reducing overall energy consumption while maintaining reliability.
Solution Approach 2:
The patent implements local quality by providing thermal insulation specifically at the receptacle location where gas liquefaction occurs, rather than insulating the entire device. The insulating layer is strategically placed around the receptacle to concentrate thermal energy where it is needed to prevent or reverse liquefaction, improving energy efficiency by addressing the problem locally rather than globally.
2Use of energy by moving object
If a receptacle with localized heating is used to vaporize liquefied gas, then energy consumption is reduced, but device complexity increases
Solution Approach 1:
The receptacle serves multiple functions: it collects liquefied gas, contains the heating element for vaporization, and is surrounded by insulating material. This multi-functionality reduces the need for separate components for each function, thereby limiting the increase in device complexity while achieving energy savings through localized heating.
Solution Approach 2:
The heating element is nested within the receptacle, and the insulating layer is nested around the receptacle. This nested arrangement integrates multiple components into a compact structure, minimizing the space required and reducing overall device complexity while still providing the necessary localized heating and insulation functions.
3Quantity of substance
If the insulating gas liquefies at low temperatures, then the gas concentration decreases, but adding heating components increases device complexity
Solution Approach 1:
The receptacle is pre-positioned and the insulating layer is pre-installed around it, ready to immediately counteract liquefaction when low temperatures occur. This preliminary preparation allows the system to quickly respond to temperature changes and maintain gas concentration without requiring complex real-time decision-making or multiple alternative heating configurations.
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
This solution effectively maintains the gas composition by locally reheating the liquefied gas, reducing energy consumption and preventing concentration gradients, thereby stabilizing the insulating properties of the electrical device.
Implementation Method 1
heating the liquified gas collected in the receptacle with a heating element
Implementation Method 2
a heating element for heating the heatable receptacle wall
Implementation Method 3
a dielectrically and thermally insulating layer located between the heatable receptacle wall and the chamber
Implementation Method 4
electrical insulation and electric arc extinction may be performed by an insulating gas within a sealed device. This insulating gas must have relatively high dielectric strength
Data Source
AI summary
A medium or high voltage electrical device and method of maintaining the composition of an insulating gas mixture in a medium or high voltage electrical device, where the device comprises a sealed chamber, said sealed chamber comprising electrical components; a gas mixture ensuring electrical insulation and/or extinguishing of electrical arcs produced in this chamber, wherein the gas mixture comprises at least one insulating gas and at least one dilution gas; and a receptacle, said receptacle comprising an opening, at least one wall, wherein at least one wall is a heatable wall, and wherein said receptacle is positioned to receive liquefied gas; the device further comprising a heating element for heating the heatable receptacle wall; and a dielectrically and thermally insulating layer located between the heatable receptacle wall and the chamber.