Optical Partial Discharge Detection in High-Voltage Cable Accessories
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Solution Overview
Problem
Existing electrical partial discharge measurement methods for high-voltage cable accessories are sensitive to electrical noise, making on-site tests unreliable, and require costly fluorescent materials to shift radiation wavelengths for detection.
Innovation Solution
An optical detector system using an optical transducer and fiber to directly detect radiation from electrical discharges without wavelength shifting, integrated with a field control element to avoid electrical noise interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If electrical partial discharge measurement is used to detect discharges in high-voltage cable accessories, then discharge detection capability is provided, but the measurement is sensitive to electrical noise from external fields making on-site tests unreliable
Solution Approach 1:
The patent replaces the electrical measurement system with an optical detection system. Instead of using electrical sensors to detect partial discharges, the invention uses optical fibers to transmit light signals generated by discharges to a detection device. This substitution eliminates the sensitivity to electrical noise while maintaining discharge detection capability, as optical signals are not affected by electromagnetic interference from external fields.
2Measurement precision
If fluorescent materials are used to shift radiation wavelengths for detection, then detectability of electrical discharge radiation is improved, but device complexity and cost increase
Solution Approach 1:
The patent extracts and removes the fluorescent wavelength-shifting materials from the detection system. Instead of using fluorescent materials to convert UV radiation to visible light, the invention directly detects the UV radiation generated by partial discharges using UV-sensitive photodetectors. This extraction eliminates the need for fluorescent layers, reducing device complexity and cost while maintaining effective discharge detection.
3Measurement precision
If fluorescent optical fibers are used to detect radiation, then wavelength shifting enables detection, but manufacturing cost and material requirements increase
Solution Approach 1:
The patent replaces expensive fluorescent optical fibers with standard optical fibers combined with UV-sensitive photodetectors. The optical fiber itself does not need to be fluorescent; it simply transmits the UV light generated by discharges to the detection device. This approach uses cheaper, readily available components while achieving the same detection function, significantly reducing manufacturing costs and material requirements.
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
Provides accurate, real-time monitoring of partial discharges with reduced component complexity and cost, enhancing sensitivity and reliability while resisting electrical noise.
Implementation Method 1
an optical transducer for generating an electrical signal from the detected radiation
Implementation Method 2
an optical fiber for transmitting said radiation
Data Source
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AI summary
The present invention relates to an optical detector for a high-voltage cable accessory. The present invention further relates to a monitoring system for detecting an electrical discharge in a high-voltage cable accessory and to a method of detecting and/or monitoring electrical discharges occurring within an insulating part of such a high-voltage cable accessory. According to the present invention, said optical detector detects a radiation generated by an electrical discharge of the high-voltage cable accessory at a wavelength of the radiation generated by the electrical discharge.