Siloxane Fluorophore Field Control for High-Voltage Cable PD Detection
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Solution Overview
Problem
High-voltage cable accessories, such as cable sleeves and terminations, are prone to failures due to partial discharges caused by assembly errors and aging of polymer insulation, which are difficult to detect early using existing methods, leading to potential electrical breakdown and significant damage.
Innovation Solution
A high-voltage cable accessory featuring a field control part with a siloxane polymer that includes covalently bonded fluorophores and dielectric pigments, coupled with a waveguide to enhance light signal detection, allowing for early and reliable monitoring of partial discharges and insulation damage through optical means.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If fiber optic methods with conventional optical fibers are used to detect partial discharges, then the detection principle is simple, but the sensitivity is insufficient to reliably detect early insulation damage
Solution Approach 1:
The patent modifies the optical fiber by changing its physical-chemical parameters - specifically doping the core with fluorophores that have specific absorption and emission wavelength characteristics. This parameter change enables the fiber to detect electrons with energies of only a few to tens of eV that cause electroluminescence, thereby significantly improving detection sensitivity for early insulation damage while maintaining the simplicity of the fiber optic detection principle
Solution Approach 2:
The patent creates a composite optical fiber structure combining the traditional optical fiber matrix with fluorophore dopants in the core. This composite material approach allows the fiber to convert invisible partial discharge electrons into detectable light signals through electroluminescence, achieving high sensitivity detection without complex external sensing equipment
2Measurement precision
If organic dyes are introduced into the insulation of high-voltage accessories, then the detection capability may be improved, but the dyes are considered contaminants that can be easily polarized electrically and represent germs for tree growth leading to breakdown
Solution Approach 1:
The patent uses fluorophores as an intermediary substance that mediates between the partial discharge electrons and the detection system. The fluorophores convert the energy of partial discharge electrons into light signals through electroluminescence, enabling detection without requiring large amounts of organic dye material in the insulation, thus maintaining insulation reliability while achieving detection capability
Solution Approach 2:
The patent changes the concentration and distribution parameters of the fluorophores, using them as dopants in the optical fiber core rather than bulk additives in the insulation. This parameter change allows detection functionality to be achieved with minimal material presence, avoiding the contamination and tree growth problems associated with introducing organic dyes into the insulation material
3Measurement precision
If electrical or electromagnetic measuring methods are used to detect inhomogeneities, then the methods are available, but they are influenced by electromagnetic interference and are technically very complex
Solution Approach 1:
The patent replaces electrical and electromagnetic measurement methods with an optical measurement system. By using fluorophore-doped optical fibers to detect partial discharges through electroluminescence, the system substitutes electrical signals with optical signals, thereby eliminating electromagnetic interference issues while maintaining detection capability and simplifying the measurement system
Solution Approach 2:
The patent introduces optical fibers with fluorophores as an intermediary detection medium that converts electrical phenomena (partial discharge electrons) into optical signals. This intermediary approach allows detection without direct electrical contact or electromagnetic field measurement, avoiding electromagnetic interference and reducing system complexity
4Measurement precision
If quantitative information on the degree of destruction is obtained using existing methods, then measurement is possible, but only after destruction structures have formed and reached a certain size, which is too late for efficient repair
Solution Approach 1:
The patent enables preliminary detection of insulation damage by detecting the electroluminescence signals from partial discharge electrons before significant destruction structures form. The fluorophore-doped optical fiber detects early-stage electrons with energies of only a few to tens of eV, providing advance warning that allows repair to be performed before critical damage occurs, thereby reducing loss of time
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 sensitive and reliable detection of partial discharges and insulation damage, facilitating timely maintenance and preventing critical breakdowns by converting early light signals into detectable wavelengths, reducing electromagnetic interference, and ensuring accurate fault location.
Implementation Method 1
The siloxane polymer has fluorophores, at least in a partial area of the field control part, which are covalently coupled to the siloxane polymer
Implementation Method 2
The waveguide is arranged in such a way that at least one light signal caused by a partial discharge in the field control part can couple into the waveguide from the field control part
Implementation Method 3
The field control part is set up to at least partially surround the cable insulation of the high-voltage cable
Data Source
AI summary
A high-voltage device (100-700) for receiving a high-voltage cable (1, 22) having a conductor (11, 112) designed to conduct an electrical current and a cable insulation (12, 122) surrounding the conductor (11, 112), comprises an insulation (2-5) and a waveguide (51, 52). The insulation (2-5) comprises an at least partly transparent or translucent field control unit (2, 4) from a siloxane polymer which is designed to at least partly surround the cable insulation (12, 122) of the high-voltage cable (1, 22), the siloxane polymer comprising, in at least one portion (2a, 2b) of the field control unit, covalently bonded fluorophores and/or dielectric pigments. The waveguide (51, 52) is arranged such that a light signal caused by a partial discharge in the field control unit (2, 4) can be coupled from the field control unit (2, 4) into the waveguide (50).