Partial Discharge Detection Using Differential Antennas
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Solution Overview
Problem
Existing partial discharge detection techniques face challenges in accurately distinguishing partial discharge signals from environmental noise, leading to reduced accuracy in sensing methods.
Innovation Solution
The use of two directional antennas with different effective areas for signal reception, where one antenna is more sensitive to partial discharge signals and the other to noise signals, with a processing module to generate a difference signal that enhances the signal-to-noise ratio by subtracting noise signals from the partial discharge signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If wireless and contactless detection is performed to ensure safety, then detection safety is improved, but environmental noise is also received which reduces sensing accuracy
Solution Approach 1:
The detection system is segmented into multiple functional components: a first antenna for receiving partial discharge signals, a second antenna for receiving noise signals, and a processing module for differential processing. This segmentation allows each component to be optimized for its specific function while working together to achieve both safety and accuracy.
Solution Approach 2:
The second antenna acts as an intermediary that specifically captures environmental noise signals. By introducing this intermediate noise-capturing component, the system can separately identify and subtract noise from the total received signal, thereby improving measurement precision while maintaining the safety benefits of wireless detection.
2Device complexity
If a single antenna is used for detection, then device complexity is reduced, but the ability to distinguish partial discharge signals from noise is compromised
Solution Approach 1:
The single antenna is replaced with two segmented antennas having different effective areas and directional characteristics. The first antenna with larger effective area captures both partial discharge and noise signals, while the second antenna with smaller effective area primarily captures noise. This segmentation enables signal discrimination without excessive complexity.
Solution Approach 2:
Each antenna is designed with specific local qualities: the first antenna has a larger effective area and is oriented toward the partial discharge source, while the second antenna has a smaller effective area and is oriented to capture ambient noise. These localized optimizations enable the system to distinguish signals from noise effectively.
3Measurement precision
If noise cancellation techniques are applied to improve signal-to-noise ratio, then detection accuracy is improved, but device complexity increases
Solution Approach 1:
The noise component is extracted from the total received signal through differential processing. By subtracting the signal from the second antenna (which primarily contains noise) from the signal of the first antenna (which contains both partial discharge and noise), the noise is effectively removed, improving signal-to-noise ratio with minimal processing complexity.
Solution Approach 2:
The system performs preliminary noise cancellation by using the second antenna to predict and counteract the noise component in the first antenna's signal. This preliminary anti-action occurs in the signal processing stage, preventing noise from overwhelming the partial discharge signals before analysis.
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 significantly improves the signal-to-noise ratio, allowing for more accurate detection of partial discharge pulses even when they have amplitudes comparable to noise signals, enhancing the reliability of partial discharge detection.
Implementation Method 1
a first antenna configured to receive electromagnetic signals at least partially associated with partial discharges of an electric object and to generate a first electrical signal
Implementation Method 2
a second antenna configured to receive electromagnetic noise signals and to generate a second electrical signal
Implementation Method 3
a first processing module configured to receive said first and second electrical signals and to generate a difference electrical signal representing the difference between the first electrical signal and the second electrical signal
Data Source
Figure 1
Figure 2~3
Figure 4
AI summary
A partial discharge detection apparatus (500), comprising: a support structure (3), a first antenna (1) configured to receive electromagnetic signals (Sd) at least partially associated with partial discharges of an electric object (100) and generate a first electrical signal (Sint); the first antenna having a first receiving effective area for first receiving directions and a second antenna (2) configured to receive electromagnetic noise signals (Sn) and generate a second electrical signal (Sin2); the first and second antennas being arranged to cause the second antenna to have a second receiving effective area for said first receiving directions smaller than said first receiving effective area. The apparatus further includes a first processing module (600) configured to generate from said first and second electrical signals a difference electrical signal (Sout) representing a difference between the first electrical signal and the second electrical signal.