Partial Discharge Detection Using Optical Intensity Ratios
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Solution Overview
Problem
Conventional PD detection methods for gas-insulated equipment face challenges in accurately evaluating discharge severity due to the impact of detection distance on signal strength, particularly for electromagnetic and acoustic detection, which affects the precision of fault location and intensity calculation.
Innovation Solution
A PD detection apparatus comprising a photon collector, optical splitter, first and second photoelectric conversion modules, and a signal processing module, which collects and divides optical radiation from gas-insulated equipment into two bands, converting them into voltage signals to calculate apparent intensities and determine discharge intensity based on their ratio, independent of the distance between the discharge position and detection point.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If electromagnetic or acoustic detection is used for PD detection, then the detection can be performed, but the detection distance seriously impacts the signal strength and makes it difficult to evaluate discharge severity
Solution Approach 1:
The patent replaces electromagnetic and acoustic detection methods with optical detection. Specifically, it uses a photon collector to gather optical radiation from PD, followed by photoelectric conversion modules to convert the optical signals into electrical signals for analysis. This substitution of detection mechanism eliminates the distance-related signal attenuation problem that plagues electromagnetic and acoustic methods.
Solution Approach 2:
The patent employs spectral parameter analysis to resolve the distance impact issue. It divides the optical radiation spectrum into multiple bands (e.g., ultraviolet, visible, infrared) and analyzes the intensity ratios between different spectral bands. Since the spectral distribution characteristics remain relatively stable regardless of distance, this parameter transformation enables accurate discharge severity evaluation independent of detection distance.
2Area of stationary object
If the detection distance is increased to cover larger equipment areas, then the coverage area is improved, but the signal strength decreases and detection precision is compromised
Solution Approach 1:
The patent replaces traditional electromagnetic/acoustic detection with optical detection using photon collectors and photoelectric conversion. Optical radiation travels without significant attenuation over the detection distances required for equipment coverage, allowing both large coverage area and high signal precision to be achieved simultaneously.
Solution Approach 2:
The patent transitions from analyzing single-dimensional signal strength (which degrades with distance) to analyzing multi-dimensional spectral characteristics. By examining the distribution of optical radiation across different wavelength bands and calculating intensity ratios, the system extracts distance-independent features that maintain precision regardless of detection distance or coverage area.
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
This approach enhances the precision of discharge intensity detection by eliminating distance-related errors and improves the accuracy of fault evaluation within gas-insulated equipment.
Implementation Method 1
a photon collector, configured to collect optical radiation caused by PD of gas-insulated equipment
Implementation Method 2
an optical splitter, configured to divide the collected optical radiation into first optical radiation and second optical radiation
Implementation Method 3
a first photoelectric conversion module, configured to convert a first optical radiation signal into a first voltage signal
Implementation Method 4
an ultraviolet fluorescent crystal, configured to convert a second optical radiation signal into an optical radiation signal of an ultraviolet fluorescence band
Implementation Method 5
a second photoelectric conversion module, configured to convert the optical radiation signal of the ultraviolet fluorescence band into a second voltage signal
Data Source
AI summary
A partial discharge (PD) detection apparatus for gas-insulated equipment includes a photon collector, an optical splitter, a first photoelectric conversion module, an ultraviolet fluorescent crystal, a second photoelectric conversion module, and a signal processing module, where the ultraviolet fluorescent crystal is configured to convert a second optical radiation signal into an optical radiation signal of an ultraviolet fluorescence band, and the signal processing module is configured to calculate first apparent intensity based on a first voltage signal output by the first photoelectric conversion module, calculate second apparent intensity based on a second voltage signal output by the second photoelectric conversion module, and determine discharge intensity of the optical radiation based on a ratio of the second apparent intensity to the first apparent intensity. Technical solutions of the present disclosure are not affected by an unknown distance between a discharge position and a detection point.