HVDCT Air-Core Inductor Semiconducting Lacquer Coating
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Solution Overview
Problem
High voltage direct current energy transmission (HVDCT) systems face the 'black spot phenomenon' due to electrostatic contamination, leading to operational failures, which existing solutions like electrostatic shielding with semiconducting foil are complex, labor-intensive, and costly to implement.
Innovation Solution
Applying a semiconducting lacquer via spraying onto the lateral surface of an HVDCT air-core inductor's outer winding layer for electrostatic screening, eliminating the need for labor-intensive foil application and complex surface treatments, while ensuring effective charge carrier dissipation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If electrostatic shielding with semiconducting foil is applied to HVDCT components, then the black spot phenomenon is prevented, but the manufacturing process becomes complex and labor-intensive
Solution Approach 1:
The patent replaces the mechanical process of applying semiconducting foil (which requires surface preparation, gluing, and multiple layers) with a chemical coating process using semiconducting paint. The paint is applied via spraying or dipping methods, eliminating the need for mechanical foil application and complex surface preparation steps while achieving the same electrostatic shielding effect.
Solution Approach 2:
The patent changes the physical state and form of the semiconducting material from solid foil to liquid paint coating. This parameter change allows the material to be applied more simply as a coating that can conform to the component surface without requiring precise mechanical positioning or adhesive bonding, thereby reducing manufacturing complexity.
2Reliability
If semiconducting foil is applied to HVDCT components, then electrostatic charging is prevented, but material costs and production time increase
Solution Approach 1:
The patent replaces the time-consuming mechanical process of foil application (including surface preparation, positioning, gluing, and curing) with a faster chemical coating process. The semiconducting paint can be applied in a single step and dries or cures more quickly, significantly improving manufacturing efficiency while maintaining the electrostatic protection function.
3Strength
If surface roughening is performed for foil adhesion, then foil bonding is improved, but health hazards from dust increase
Solution Approach 1:
The patent eliminates the mechanical surface roughening process entirely by using a chemical coating approach. The semiconducting paint is applied directly to the surface without requiring prior roughening, thereby preventing the generation of hazardous dust while still achieving adequate adhesion through the nature of the paint formulation and application method.
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 spraying method provides a cost-effective and even electrostatic screening, preventing the 'black spot phenomenon with a simpler manufacturing process, reducing material costs and health hazards, and ensuring efficient charge dissipation across the entire surface.
Implementation Method 1
a layer (22) made of a semiconducting paint that is formed from an electrostatically dissipative material having a surface resistance in the region from 109 to 1014 ohm/square
Data Source
AI summary
A high voltage direct current energy transmission (HVDCT) air-core inductor includes at least one concentric winding layer having electric terminals are formed at its ends, and includes an electrostatic shield that has a layer of electrostatically dissipative material having a surface resistance ranging from 109 to 1014 ohm/square, wherein at least one end of the layer is provided with a collector electrode that extends essentially along the circumference of the end of the layer and that is to be connected to one of the terminals, and where the layer is designed as a spray coating on an outer surface of an exterior winding layer.