Partial Discharge Detection Using Dual Low-Frequency Sensors
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Solution Overview
Problem
Existing devices and methods for detecting partial discharges in electrical equipment are inefficient, limited in precision, and prone to false positives/negatives, failing to accurately locate and interpret these discharges in electrical grids.
Innovation Solution
An apparatus and method utilizing two sensors with an operating range below 30 Megahertz to detect magnetic fields on either side of a discharge site, processing signals to identify partial discharges and triggering an alarm, with features like amplification, data buffering, and real-time processing to enhance detection accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If existing devices and methods are used for detecting partial discharges, then detection capability is provided, but detection precision and accuracy are insufficient, leading to false positives and false negatives
Solution Approach 1:
The detection system is segmented into multiple independent sensors (first sensor and second sensor) positioned at different locations relative to the discharge site. Each sensor independently detects magnetic fields, and the processor analyzes the difference between sensor readings to determine discharge location and characteristics, thereby improving precision and reducing false positives
Solution Approach 2:
The processor acts as an intermediary that receives raw signals from multiple sensors, applies filtering and analysis algorithms, and produces processed signals that indicate partial discharge presence and location. This intermediary processing layer eliminates noise and false readings, enhancing detection accuracy
2Measurement precision
If existing detection methods are used, then partial discharge detection is possible, but the ability to locate discharge sites precisely is limited
Solution Approach 1:
The system transitions from single-point detection to multi-dimensional spatial detection by positioning sensors at different locations and analyzing the spatial distribution of magnetic field signals. This dimensional approach enables precise discharge location while maintaining manageable system complexity through structured sensor placement
Solution Approach 2:
The system replaces complex mechanical positioning and analysis mechanisms with electronic signal processing. The processor uses algorithmic analysis of electrical signals from distributed sensors to determine discharge location, substituting mechanical complexity with computational processing that achieves higher precision
3Reliability
If sensors with operating range below 30 Megahertz are used, then detection of magnetic fields is achieved, but the system must process signals in a specific frequency range requiring specialized processing
Solution Approach 1:
The system is optimized for a specific frequency parameter range (below 30 MHz) rather than attempting to handle all frequencies. Sensors are selected and processed signals are filtered to work within this constrained frequency band, which simplifies the processing requirements while maintaining reliable detection for the target application
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
The solution provides precise detection and location of partial discharges, reducing false alarms and improving safety by accurately identifying discharge sites in electrical equipment, enhancing maintenance and repair processes in power grids.
Implementation Method 1
a first sensor and a second sensor, each sensor having an operating range below 30 Megahertz, the first sensor being configured to detect the first magnetic field and produce a first signal representative of the first magnetic field
Implementation Method 2
the second sensor configured to detect the second magnetic field and produce a second signal representative of the second magnetic field
Data Source
AI summary
An apparatus and method for detecting a partial discharge produced at a discharge site in electrical equipment or accessories are provided. The apparatus includes two sensors having an operating range below 30 Megahertz, between 5 and 30 Megahertz, between 14 and 20 Megahertz, or centered at 18 Megahertz. The apparatus includes an acquisition module, a processor and an alarm module producing an alarm upon detection of a partial discharge in the electrical equipment or accessories. The method includes detecting magnetic fields with the sensors, generating and receiving two signals and producing a resulting signal by processing the two signals. The processor is configured to issue alarm instructions if the resulting signal exhibits a property representative of a detection of the partial discharge and otherwise remain in a standby state (ready for signal detection). The method includes generating an alarm after issuing the alarm instructions.