Partial Discharge Measurement Instrument Real-Time Signal Processing
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Solution Overview
Problem
Current instruments for measuring partial electrical discharges in high-voltage systems face challenges in preserving information content due to high-frequency signals and noise interference, leading to difficulties in interpreting results and requiring significant operator expertise, especially in unsupervised and automatic diagnostics.
Innovation Solution
An instrument with data processing means associated with both input and output stages that generates a digital representation of the entire waveform of partial discharge pulses, allowing real-time extraction of predetermined parameters and processing without intermediate storage, effectively separating significant signals from noise and enabling efficient, automatic measurement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If high-frequency signals are measured to capture partial discharge information, then measurement precision is improved, but noise interference increases and signal separation becomes difficult
Solution Approach 1:
The patent extracts and removes noise components from the measured signal using digital signal processing techniques. The system identifies and separates noise from genuine partial discharge signals through filtering algorithms, allowing high-frequency information to be captured while eliminating harmful noise interference that would otherwise obscure the diagnostic information.
Solution Approach 2:
The patent introduces an intermediary processing stage between the sensor and the final measurement output. This intermediate digital signal processing layer acts as a mediator that cleanses the raw signal of noise while preserving the essential high-frequency discharge characteristics, enabling precise measurement without direct exposure to noise contamination.
2Productivity
If real-time processing is implemented to reduce dead time, then productivity is improved, but device complexity increases
Solution Approach 1:
The patent performs preliminary signal processing actions directly at the point of measurement. Digital filtering and noise removal operations are executed in real-time as the signal is being acquired, rather than processing data later. This preliminary action approach reduces dead time by preparing the signal immediately while maintaining measurement productivity.
Solution Approach 2:
The patent replaces complex mechanical or analog signal conditioning systems with digital processing techniques. Instead of using complicated hardware circuits to manage signal processing, the system employs digital algorithms that can be implemented through software or simple digital logic, reducing physical device complexity while maintaining or improving processing speed.
3Ease of operation
If automatic diagnostics are implemented to reduce operator expertise requirements, then ease of operation is improved, but measurement reliability may deteriorate
Solution Approach 1:
The patent implements self-service diagnostic capabilities where the system automatically analyzes its own measurements and generates diagnostic conclusions without requiring external operator intervention. The automatic diagnostic algorithms process the cleaned signal data, identify discharge patterns, and provide interpretive results, enabling the system to serve itself while maintaining diagnostic reliability through sophisticated automated analysis.
Solution Approach 2:
The patent incorporates feedback mechanisms where the system continuously monitors the quality of its measurements and adjusts its processing parameters accordingly. The automatic diagnostic system uses feedback from the signal characteristics to refine its analysis, ensuring that diagnostic accuracy is maintained even when operating without human expertise. This feedback loop allows the system to self-correct and maintain high reliability in automatic mode.
Data Source
AI summary
An instrument (1) and a method for measuring pulses of partial electrical discharges in an electrical system comprise data processing means (5) operatively associated both with an input stage (2), able to receive an analogue signal (3) representing said pulses and to provide a digital representation of the entire wave form of the pulses, to receive said digital representation, extract the value of predetermined parameters relating to the wave form of the pulses and transfer to and output stage (4) a processed digital signal comprising said values, the processing means (5) being able to operate substantially in real time, i.e. with no need for a memory for the intermediate storage of the data. Known solutions within the field of the measurement of partial discharge pulses for diagnostic purposes provide for the use of peak detector instruments, which are not able to measure all information useful for a diagnosis of the electrical system, and oscilloscopes interacting with a computer, disadvantageous in terms of costs and of calculation efficiency.