Electrical Operating Resource State Analysis for PD Localization
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Solution Overview
Problem
Existing methods for partial discharge (PD) measurement in electrical operating resources suffer from low sensitivity and inaccurate fault localization due to signal attenuation and dispersion, especially in complex systems like GIS and GIL, leading to limited quality assurance and difficulty in identifying fault sources.
Innovation Solution
A method involving the application of a test voltage, acquisition of measurement signals, and determination of transfer parameters using linear predictive coding (LPC) to characterize PD signals, allowing for precise determination of fault locations and charge values through transfer functions and noise-resistant response signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If partial discharge measurements are carried out using known measurement methods, then the presence of partial discharges can be detected, but the sensitivity is low and the measurement precision deteriorates due to signal attenuation and deformation in the transmission path
Solution Approach 1:
The patent applies preliminary action by injecting a test pulse before the actual partial discharge measurement to characterize the transmission path. The transfer function is determined in advance by analyzing the reflected test pulse, which captures the attenuation and deformation characteristics of the transmission path. This preliminary characterization enables subsequent compensation when measuring partial discharge signals, thereby improving measurement precision without sacrificing detection capability.
2Area of stationary object
If the distance between the partial discharge location and the measuring point increases, then the measurement coverage is improved, but the measurement precision deteriorates due to greater signal attenuation
Solution Approach 1:
The patent implements feedback by using the measured test pulse reflection to continuously characterize the transmission path conditions. The transfer function derived from the test pulse provides real-time information about signal attenuation and deformation in the transmission path. This feedback mechanism enables dynamic compensation of distance-related attenuation effects, allowing accurate measurements even at large distances between the partial discharge location and measuring point.
3Loss of information
If time-domain reflectometry is used for fault localization, then the fault location can be determined, but the measurement precision deteriorates due to signal attenuation and dispersion making localization difficult
Solution Approach 1:
The patent introduces an intermediary approach by using a test pulse as a mediator to characterize the transmission path before measuring the actual partial discharge signal. The test pulse reflection serves as an intermediary measurement that reveals the transmission path's attenuation and dispersion characteristics. This intermediary step enables accurate fault localization by providing the necessary compensation parameters for interpreting the actual partial discharge signal, overcoming the limitations of direct time-domain reflectometry.
4Reliability
If multiple discharges are present in GIS or GIL systems, then the detection coverage is improved, but the difficulty of detecting and measuring individual faults increases due to masking effects
Solution Approach 1:
The patent applies segmentation by using the transfer function characterization to separate and identify individual partial discharge events even when multiple discharges are present. The test pulse-based transfer function provides a reference that enables decomposition of the composite signal into individual discharge components. This segmentation approach allows each fault source to be individually analyzed and localized, overcoming the masking effects that occur when multiple discharges are present in GIS or GIL systems.
Data Source
AI summary
A method analyzes the state of an electrical operating resource. The method includes: applying a test voltage to the operating resource; acquiring a measurement signal at a connection point of the operating resource; ascertaining transfer parameters that characterize a signal transmission from a location of a partial discharge in the operating resource to the connection point depending on the measurement signal; and determining at least one characteristic variable of the partial discharge depending on the transfer parameters.