Combined Acoustic-Electromagnetic Sensor for Partial Discharge Detection
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Solution Overview
Problem
Existing partial discharge detection systems in electrical apparatus face challenges in accurately identifying the type and location of discharges due to signal synchronization issues and external disturbances, which are costly and difficult to maintain.
Innovation Solution
A method and system that senses both acoustic and electromagnetic waves using a single sensing device to generate a combined signal, allowing for the determination of the occurrence and properties of electrical discharges without the need for time synchronization, using a signal processing device to process this combined signal and identify the type and location of the discharge.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple sensors are used for detecting partial discharges, then the accuracy of identifying discharge type and location is improved, but the device complexity and cost increase
Solution Approach 1:
The patent combines acoustic and electromagnetic sensing capabilities into a single integrated sensor unit. This merging of functions allows the system to detect both acoustic waves and electromagnetic waves simultaneously without requiring separate sensor systems, thereby reducing device complexity while maintaining the ability to identify discharge type and location accurately
Solution Approach 2:
The single sensing device is designed to perform multiple functions: detecting acoustic waves, detecting electromagnetic waves, and generating a combined signal for processing. This multi-functional approach eliminates the need for multiple specialized sensors and their associated synchronization and processing infrastructure
2Measurement precision
If time synchronization is implemented for multiple sensors, then the accuracy of discharge localization is improved, but the reliability decreases due to synchronization issues and external disturbances
Solution Approach 1:
By merging acoustic and electromagnetic detection into a single sensor that outputs a combined signal, the system eliminates the time synchronization requirements between multiple sensors. The combined signal inherently contains temporal information from both wave types without requiring external synchronization mechanisms, thereby improving reliability under disturbance conditions
Solution Approach 2:
The combined signal acts as an intermediary that carries both acoustic and electromagnetic information simultaneously. This intermediary format allows the system to process discharge localization without relying on time difference measurements that are vulnerable to external disturbances and synchronization errors
3Measurement precision
If multiple time-synchronized sensors are used, then the measurement precision is improved, but the ease of operation and maintenance deteriorates
Solution Approach 1:
The integration of acoustic and electromagnetic sensing into a single device eliminates the need for complex time synchronization and calibration procedures required by multiple sensors. The combined signal processing approach simplifies operation and maintenance while preserving measurement precision for discharge detection
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 provides a cost-effective and reliable method for detecting and localizing electrical discharges, reducing interference from external sources and improving the accuracy of discharge identification and localization within the electrical apparatus.
Implementation Method 1
sensing an acoustic wave and an electromagnetic wave using a first sensing device
Implementation Method 2
sensing an acoustic wave and an electromagnetic wave using a first sensing device
Implementation Method 3
generating a first combined signal, wherein the first combined signal is a single signal including a component corresponding to the acoustic wave and a component corresponding to the electromagnetic wave
Data Source
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AI summary
The present disclosure provides a detection system (100, 200) for detecting an electrical discharge in an electrical apparatus, and a method for detecting an electrical discharge in an electrical apparatus. The detection system (100, 200) includes a first sensing device (101, 101a) configured for sensing an acoustic wave (3) and an electromagnetic wave (4) and generating a first combined signal (SC, SC1) and a signal processing device (110) configured for processing the first combined signal (SC, SC1) to determine the occurrence and properties of an electrical discharge (1). In further embodiments, the detection system (200) further includes at least a second sensing device (101b) configured for sensing the acoustic wave (3) and the electromagnetic wave (4) and generating a second combined signal (SC2), wherein the signal processing device (110) is further configured for comparing the first combined signal (SC1) and the second combined signal (SC2).