Automated Partial Discharge Inspection System for Electrical Parts
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Solution Overview
Problem
Traditional techniques for identifying unwanted partial discharge in electrical parts require significant manual involvement and are inefficient in detecting flaws in insulation, especially in areas with air bubbles, leading to incomplete and labor-intensive evaluations.
Innovation Solution
A computer-controlled inspection system incorporating an impulse voltage source, automated switch, high-frequency filter, and high-speed digitizer that selectively applies a fast-rise-time pulse voltage to electrical parts, filters high-frequency noise, and analyzes peak amplitudes to determine partial discharge events, allowing for automated and sensitive evaluation without manual intervention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional manual techniques are used to identify partial discharge, then the system is simpler, but the inspection efficiency and detection completeness deteriorate significantly
Solution Approach 1:
The patent replaces manual mechanical switching operations with an automated computer-controlled system. The computer automatically controls the voltage source, switch, and signal processing components, eliminating the need for manual phase switching while significantly improving inspection efficiency and detection completeness through automated high-frequency signal analysis
Solution Approach 2:
The system performs self-service through automated feedback loops where the computer monitors the electrical part under test, automatically adjusts testing parameters, and evaluates insulation quality without human intervention. The high-frequency filter and digitizer automatically detect and analyze partial discharge signals, providing continuous self-assessment of insulation integrity
2Measurement precision
If manual switching between phases is used, then the device complexity is lower, but the measurement precision and detection accuracy deteriorate
Solution Approach 1:
The patent substitutes manual mechanical phase switching with automated electronic control. The computer-controlled switch and voltage source enable precise, repeatable testing conditions that improve measurement precision, while the automated signal processing through high-frequency filtering enhances detection accuracy without requiring manual intervention
Solution Approach 2:
The system implements feedback mechanisms where the computer continuously monitors the electrical part under test, analyzes the high-frequency signals from the digitizer, and adjusts testing parameters in real-time. This feedback loop ensures accurate detection of partial discharge events and maintains consistent measurement precision across multiple testing phases
3Measurement precision
If high surge voltages are applied to detect partial discharge, then the detection sensitivity improves, but the risk of damaging the electrical part increases
Solution Approach 1:
The patent changes the voltage application parameters by using fast-rise-time pulse voltages with controlled amplitude and duration. The computer-controlled voltage source can adjust pulse characteristics to optimize detection sensitivity while limiting the energy input to prevent insulation damage, thereby reducing the harmful effects of high surge voltages
Solution Approach 2:
The system employs periodic pulse voltage application rather than continuous high voltage. The computer controls the voltage source to apply pulses at specific intervals, allowing the insulation to recover between tests while maintaining detection sensitivity. This periodic action reduces the cumulative stress on insulation and minimizes damage risk
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 system enables efficient and sensitive detection of partial discharge events at lower surge voltages, identifying flaws that traditional methods miss, reducing manual labor and improving evaluation efficiency while accurately assessing insulation quality.
Implementation Method 1
the filter, which is configured to pass any frequency of the voltage from the part that differs from the frequency of the reference signal received from the voltage source
Implementation Method 2
the voltage source provides a fast-rise-time pulse voltage to input terminals of the automated switch as well as to input terminals of the high-frequency filter as a reference signal
Implementation Method 3
The digitizer passes the peak amplitude of the filtered signal to the computer for analysis
Data Source
AI summary
An electrical part testing system for evaluating quality of an insulated electrical part, including a computer-controlled switching apparatus for providing an original voltage to the electrical part automatically according to a pre-established testing scheme calling for provision of voltage to each phase of the part, in turn, while grounding the other phases of the part. A high-frequency filter for receiving receive the original voltage, receiving a load voltage emanating from the electrical part in response to the part receiving the original voltage, and filtering the original voltage from the load voltage to isolate any partial-discharge voltage added to the original voltage by the electrical part while the part is being electrified by the original voltage, yielding a filtered signal. A computing device determines, based on a comparison of a peak amplitude of the partial-discharge inception voltage to a voltage threshold, the quality of the electrical part being tested.