Gas-Insulated Transformer Auxiliary Heating
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Solution Overview
Problem
Gas-insulated transformers using fluoroketones face challenges with condensation at low temperatures, reducing dielectric strength and requiring lower partial pressures, which affects both dielectric and cooling capabilities, especially in non-operational states where heat generation is minimal.
Innovation Solution
Incorporating an auxiliary power source to heat the windings before operation, converting condensed insulation fluid back to a gaseous state, and using a compact design with no additional heating means, allowing the windings to function as heating elements using no-load or load losses, and employing a heat transfer fluid system with a bypass channel for efficient heat management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If fluoroketone is used as insulation fluid to reduce GWP, then environmental performance is improved, but condensation risk increases at low temperatures
Solution Approach 1:
The auxiliary heating device is activated before the transformer is energized to preheat the insulation fluid and prevent condensation. This preliminary action ensures the insulation fluid remains in gaseous state during the critical startup phase when no load losses are generated yet.
Solution Approach 2:
The auxiliary heating device acts as an intermediary element that temporarily compensates for the insufficient heat generation during startup. It provides the necessary thermal energy to maintain the insulation fluid in gaseous state until the transformer reaches operational temperature through load losses.
2Reliability
If partial pressure of fluoroketone is reduced to prevent condensation, then condensation risk is decreased, but dielectric withstand capability is reduced
Solution Approach 1:
The invention changes the temperature parameter of the insulation fluid through auxiliary heating, rather than changing the pressure parameter. By maintaining the fluid in gaseous state through temperature control, the system achieves both condensation prevention and full dielectric strength without requiring pressure reduction.
3Reliability
If additional heating means are added to prevent condensation, then condensation risk is reduced, but device complexity increases
Solution Approach 1:
The auxiliary heating device serves multiple functions: it prevents condensation during startup, maintains minimum operating temperature during light load conditions, and can assist in cooling system operation. This multi-functionality justifies the additional component while avoiding unnecessary complexity.
Solution Approach 2:
The transformer's own windings and core serve as the heating elements through their inherent resistance and magnetic losses. The system uses self-generated heat during normal operation, requiring only a simple auxiliary heating device for startup conditions rather than a complex external heating system.
4Device complexity
If compact design is implemented without additional heating means, then device complexity is reduced, but ability to prevent condensation is worsened
Solution Approach 1:
The transformer components (windings and core) serve their dual function of electrical operation and heat generation. During normal operation, load losses and no-load losses naturally maintain the insulation fluid temperature above dew point, eliminating the need for separate heating systems in compact designs.
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
Ensures the insulation fluid remains in a gaseous state at nominal composition and high dielectric strength, enabling safe and full-rated voltage operation independent of load conditions, while maintaining a compact and efficient design.
Implementation Method 1
an auxiliary power source (34) which is connectable to one or more of the at least one winding when the electrical apparatus is in the non-operational state
Implementation Method 2
a dielectric insulation fluid comprising an organofluorine compound... ensuring that the insulation fluid remains in a gaseous state
Implementation Method 3
employing a heat transfer fluid system with a bypass channel for efficient heat management
Data Source
AI summary
The present invention relates to an electrical device comprising a gas-insulated transformer or reactor. The electrical device comprises a housing enclosing an interior space, at least a portion of which defining an insulation space containing a dielectric insulation fluid comprising an organofluorine compound, and an electrical component being arranged in the insulation space and being surrounded by the insulation fluid. The electrical component comprises at least one winding. The electrical device further comprises an electrical connector for bringing the apparatus from non-operational state to operational state by connecting at least one winding to a power grid. The device further comprises an auxiliary power source which is connectable to at least one winding when the apparatus is in the non-operational state.