Transformer Gas-Level Sight Tube With Replaceable Protective Shield
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Solution Overview
Problem
Current transformer protection devices (TPDs) face issues with durability, visibility, and maintenance due to the use of specialized and expensive polymers for gas-liquid viewing enclosures, which are prone to damage, discoloration, and leakage, making it difficult to accurately assess gas levels and colors without exposing the transformer to air, leading to increased costs and potential transformer failures.
Innovation Solution
A TPD design featuring a transparent glass tube with a curved, ergonomically designed polymer protective shield that allows 180-degree visibility of gas-liquid levels, eliminating the need for direct contact between polymer and transformer liquid, and enabling easy replacement of the protective shield without exposing the transformer to air, using a glass tube that is more compatible and resilient than polymers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a see-through polymer is used for the gas-liquid viewing enclosure to enable visibility of gas accumulation, then visibility is improved, but the polymer is prone to damage, discoloration, and leakage under UV exposure and harsh environmental conditions, reducing reliability
Solution Approach 1:
A transparent glass tube is introduced as an intermediary between the transformer liquid and the external environment. The glass tube provides UV resistance and chemical stability while maintaining transparency for visibility. The polymer is then used only as a protective outer shield that does not contact the liquid, separating the visibility function from the durability function.
Solution Approach 2:
The viewing enclosure uses a composite structure combining glass and polymer materials. The glass tube provides UV resistance and chemical compatibility with transformer liquid, while the outer polymer shield provides impact resistance and environmental protection. This composite approach leverages the strengths of both materials to overcome their individual weaknesses.
2Ease of operation
If a polymer viewing enclosure is used to allow observation of gas levels, then ease of operation is improved, but the polymer requires specialized formulations that are expensive and difficult to manufacture, increasing device complexity
Solution Approach 1:
The glass tube serves as an intermediary that eliminates the need for specialized polymer formulations. Since glass is inherently UV-resistant and chemically stable, the outer polymer shield does not need to meet stringent compatibility requirements, allowing use of standard, cost-effective polymer materials.
Solution Approach 2:
The outer polymer shield is designed as a replaceable protective component that can be easily replaced if damaged. This approach uses simpler, cheaper polymer materials that don't require long-term durability, as the shield can be replaced without affecting the core functionality provided by the glass tube.
3Reliability
If the polymer viewing enclosure is damaged or deteriorates, then reliability is reduced, but replacing the entire TPD or even the polymer part requires exposing the transformer liquid to outside air, increasing loss of substance and time
Solution Approach 1:
The viewing enclosure is segmented into separate replaceable components: the inner glass tube containing the liquid and float mechanism, and the outer polymer shield. This segmentation allows the outer shield to be replaced independently without exposing the transformer liquid to air, as the glass tube remains sealed and connected to the transformer tank.
Solution Approach 2:
The glass tube acts as a permanent sealed intermediary that maintains the barrier between transformer liquid and the external environment. Even when the outer polymer shield is removed or replaced, the glass tube ensures the liquid remains isolated from air, preventing contamination and eliminating the need to shut down the transformer for maintenance.
4Strength
If a monodirectional glass viewing window is used to protect the viewing enclosure, then strength is improved, but visibility from multiple angles is reduced, worsening ease of operation
Solution Approach 1:
The glass tube is designed with a curved cylindrical shape that allows light to refract and reflect in multiple directions. This curvature enables operators to view the gas-liquid level from various angles around the device, not just from a single fixed position, while maintaining the protective benefits of glass.
Solution Approach 2:
The viewing enclosure transitions from a planar monodirectional window to a three-dimensional curved glass tube. This dimensional change allows light to travel through the curved surface from multiple angles, providing multidirectional visibility while maintaining the structural strength and protective qualities of glass.
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
The design enhances visibility and durability, allowing operators to detect gas accumulation and liquid levels from multiple angles without shutting down the transformer, reduces the risk of liquid leakage and air ingress, and simplifies maintenance by allowing on-site replacement of the protective shield, thus improving the reliability and cost-effectiveness of transformer protection.
Implementation Method 1
an integrated float adapted to be moved up and down inside said transparent enclosure
Implementation Method 2
These gases rise due to their inherent buoyancy, and due to purposeful arrangement of transformer and TPD the gasses are collected in the TPD
Data Source
Figure 1~2
Figure 3
Figure 4~5
AI summary
Disclosed herein a protection device for an liquid filled transformer, enclosed within a body, comprising a dipping tube affixed within an annular base; said annular base mounted onto a transformer enclosure, consisting of a portion immersed in the transformer tank and a portion outside and above the transformer tank; a transparent enclosure allowing said liquid from the transformer that it contains to be seen from substantially around its perimeter, an integrated float adapted to move up and down inside said transparent enclosure and to trigger an electrical contact while reaching a predetermined limit towards the bottom of the transparent enclosure; wherein said transparent enclosure comprises a first layer being a transparent glass tube having a predetermined visually ergonomical curvature containing said integrated float and a second outer layer being a curved transparent polymer protective shield that covers parts of said transparent glass tube, that is not surrounded by said body.