Submersible Dry Transformer Insulation Sheet
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Solution Overview
Problem
Current submersible transformers in insulating oil face risks of explosion and environmental contamination, require complex and costly underground installations, and have limitations in power capacity due to the use of oil-based insulation, while dry transformers are limited by humidity and pollution tolerance and power capacity.
Innovation Solution
A submersible dry distribution transformer with a solid insulation system that uses an electrical insulation sheet to block water and prevent conductive spiral formation, allowing for higher power capacity and installation in underground environments without oil containment systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If submersible transformers use insulating oil, then insulation performance is improved, but explosion risk and environmental contamination increase
Solution Approach 1:
The patent extracts and removes the insulating oil from the transformer system, replacing it with a dry insulation system using solid insulating materials and a sealed enclosure. This eliminates the harmful factors associated with oil (explosion risk, environmental contamination) while maintaining insulation performance through alternative solid insulation structures.
Solution Approach 2:
The patent changes the physical state of the insulation medium from liquid (oil) to solid (insulating materials), fundamentally altering the system's parameters to eliminate harmful effects while maintaining or improving insulation performance through different physical mechanisms.
2Reliability
If submersible transformers use insulating oil, then insulation performance is improved, but device complexity and installation cost increase due to oil containment requirements
Solution Approach 1:
By removing the oil containment system entirely and replacing it with a dry insulation approach using solid materials and sealed enclosures, the patent significantly reduces device complexity and eliminates the need for complex oil containment infrastructure in underground installations.
3Object-affected harmful factors
If dry transformers are used, then explosion risk is eliminated, but power capacity is limited due to humidity and pollution tolerance constraints
Solution Approach 1:
The patent changes the operational environment parameters by providing a sealed enclosure that protects internal components from external humidity and pollution, allowing dry transformers to operate at higher power capacities without being constrained by environmental factors.
Solution Approach 2:
The patent employs composite insulation structures combining multiple solid insulating materials with different properties to achieve both high voltage insulation performance and protection against environmental factors, enabling higher power capacity in dry transformer designs.
4Object-generated harmful factors
If dry transformers are used, then environmental contamination is eliminated, but power capacity is reduced compared to oil-based transformers
Solution Approach 1:
The patent uses composite insulation structures with multiple solid materials having complementary properties to achieve insulation performance comparable to or exceeding oil-based systems, thereby enabling higher power capacity while maintaining environmental benefits of oil-free operation.
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 the transformer to operate at higher powers without explosion risks, self-extinguishable in case of fire, and eliminates environmental contamination, allowing for simpler and more economic underground installations with increased power capacity and reduced maintenance needs.
Implementation Method 1
at least one electrical insulation sheet (4) assembled on at least a core window (20) of said transformer, configured to block the passage of a liquid, particularly water, and the formation of a conductive spiral when the transformer is submerged
Implementation Method 2
iron core for circulation of the magnetic flow
Implementation Method 3
The transformation relation of the transformer is given by the relation of spirals among the windings
Implementation Method 4
The oil also acts as a cooling element, transmitting and transporting the heat produced in the windings and the core, to the cooling surfaces of the tank and of the radiators
Data Source
AI summary
It is described a single-phase or three-phase distribution electric transformer, of solid insulation, for use in aerial installation, in poles, in platforms or pedestals, or installation in underground distribution network for operation in air environment, semi-submerged or submerged. Such transformer comprises at least one high voltage winding (3) and at least one low voltage winding (2) concentrically assembled around a core column (1.2,1.3), the low voltage and high voltage windings (2,3) being electrically isolated from a solid material, a core window (20) being defined as a space between two core columns (1.2,1.3), the transformer comprising at least one electrical insulation sheet (4) assembled on at least a core window (20) of said transformer, the assembly of the electrical insulation sheet (4) being defined in the longitudinal direction (300) of the transformer. Such sheet (4) avoids the formation of spiral around the core by immersion water or conductive dust. The use of this dry transformer in the underground distribution networks in the cities offers more safety to the population, because the dry transformer does not explode, apart from eliminating the risk of environmental contamination through the leakage of oil from transformers in oil. Once the dry transformer of the invention does not explode, the underground installation chambers can be simpler and more economic once they do not need to be resistant to explosion.