To achieve more reliable grid it is crucial for utilities to expedite the repair process of critical assets, including Shunt Capacitor Banks (SCBs). Exposure to.
The physical mechanism of CVT ME is as follows: From Fig. 1, the high voltage U p on the primary side is divided into medium voltage by the CVD, and then the medium voltage is reduced into the low voltage output U s by the IVT. Since the high voltage U p is stepped down by the CVD, the insulation requirement for the IVT is reduced. The CVD is composed of hundreds
Therefore, a data-driven method for anomaly detection and aging model parameter estimation of capacitors is proposed. Firstly, Mahalanobis distance is introduced to analyse the correlation between capacitance loss and equivalent series resistance (ESR) and eliminate the dimensional effect.
Contrary to the DC network grounding methods discussed earlier, in Ref. [51], it presents reconfigurable grounding methods for DC traction networks, where the network is operated in ungrounded configuration to reduce the corrosion intensity, and upon detection of a high voltage, the network is grounded to reduce the voltages to safe levels.
PHM (Prognostics and Health Monitoring) techniques can be used to monitor the evolution of a capacitor health condition and to predict its RUL (Remaining Useful Life). This
Author affiliations. 1 State Key Laboratory of Advanced Electromagnetic Engineering and Technology, School of Electrical and Electronic Engineering, Huazhong University of Science and Technology, Wuhan 430074, People''s Republic of China. 2 State Grid Shandong Electric Power Research Institute, Jinan 250002, People''s Republic of China
Capacitor defects significantly contribute to infant and latent failures in integrated circuits. This paper will address methods of locating capacitor defects and root cause determi-nation. Keysight Technologies'' failure analysis team investigated tens of failures in an externally purchased voltage controlled oscillator (VCO).
In this paper, we propose an ultra-light electrolytic capacitor appearance defect detector based on YOLOv5, without compromising the detection accuracy. MobileNet, GSconv and GSCSP are used to compress the network model, reducing the network model complexity and model size, while the CBAM attention mechanism is used instead of the SE mechanism
Capacitor failure analysis brings up specific issues that demand corresponding solutions. The ultimate goal of capacitor failure analysis is to determine the fundamental cause of failure or whether the incorrect operation is due to manufacturing flaws, end-user abuse, or other causes. The first step in capacitor failure analysis is finding where an analyst should start looking for a
There are two methods, direct and indirect, for measuring the moisture content [4,5]. For reducing the edge effect, the analysis software COMSOL Multiphysics 6.0 (COMSOL) was used to model the two capacitors and the air domain in three dimensions . The plate material is copper, and the electrostatic field was used as the physical field. Finally, the simulated
The author is performed the comprehensive review of DC fault protection methods in the HVDC transmission systems (for both CSC and VSC based HVDC systems and both two-terminal and multi-terminal HVDC networks). The DC fault protection methods include different fault detection, location and isolation methods have been explained. Also, the
PSMA/IEEE Capacitor Workshop –2020.04.21 Mark Scott, Ph.D. scottmj3@miamioh Electrolytic Capacitors • R ESR determined by volume of electrolyte. – Dependent on
Finally, the CNN algorithm was used for the capacitor fault detection. The advantages of the proposed method are that big data are compressed to extract meaningful
PSMA/IEEE Capacitor Workshop –2020.04.21 Mark Scott, Ph.D. scottmj3@miamioh Electrolytic Capacitors • R ESR determined by volume of electrolyte. – Dependent on temperature. – Negative Temperature Coefficient. • Primary Failure Mechanisms: – Electrolyte Vaporization • Electrolyte is lost over time. • Heavily dependent on
This text is written for a course on instrumental methods of quantitative analysis. It summarizes the basic concepts of modern voltammetric techniques of analysis. The guiding concept of this text is to demonstrate how the ratio of faradaic to capacitive currents decides about the sensitivity of the techniques, and how this ratio can be increased by electronics,
detection results of CVT measurement errors in engineering applications is analyzed, and a multi-layer wavelet analysis signal denoising method is proposed to enhance
The article covers various techniques, including impedance spectroscopy, frequency response analysis, harmonic analysis, wavelet analysis, short-time Fourier
detection results of CVT measurement errors in engineering applications is analyzed, and a multi-layer wavelet analysis signal denoising method is proposed to enhance the self-detection ability of CVT measurement errors.
In this paper, we propose an ultra-light electrolytic capacitor appearance defect detector based on YOLOv5, without compromising the detection accuracy. MobileNet, GSconv
An arrayed detection coil and comb capacitor combination mode is proposed to realize the function of the simultaneous detection of metal and living organism foreign objects, and a compensation capacitor is introduced to
PHM (Prognostics and Health Monitoring) techniques can be used to monitor the evolution of a capacitor health condition and to predict its RUL (Remaining Useful Life). This paper uses artificial neural networks to monitor the degradation index of capacitors and predict the corresponding RUL.
Remote methods are communication-based methods that employ SCADA [2] and PLCC scheme [3] for islanding detection. Communication based methods are costlier to be implemented in practical system. But the accuracy is better as compared to other methods and in highly demanded network the application of such methods is indeed essential. Again, such
The purpose of this work is to improve the detection and characterization of capacitor based failures due to dielectric defects. Capacitor defects significantly contribute to infant and latent failures in integrated circuits. This paper will address methods of locating capacitor defects and root cause determination. Keysight Technologies'' failure analysis team investigated tens of
Therefore, a data-driven method for anomaly detection and aging model parameter estimation of capacitors is proposed. Firstly, Mahalanobis distance is introduced to
Finally, the CNN algorithm was used for the capacitor fault detection. The advantages of the proposed method are that big data are compressed to extract meaningful feature images, the operating...
The article covers various techniques, including impedance spectroscopy, frequency response analysis, harmonic analysis, wavelet analysis, short-time Fourier transform, and algorithm-based predictive models. These techniques enable early detection of capacitor faults, accurate estimation of capacitance and equivalent series resistance (ESR
Capacitor defects significantly contribute to infant and latent failures in integrated circuits. This paper will address methods of locating capacitor defects and root cause determi-nation.
To achieve more reliable grid it is crucial for utilities to expedite the repair process of critical assets, including Shunt Capacitor Banks (SCBs). Exposure to.
In this study, a real-time object detection algorithm based on an improved single shot multibox detector (SSD) is proposed to achieve omnidirectional surface defect detection of electrolytic capacitors. First, an electrolytic capacitor surface image acquisition device was established to capture omnidirectional surface images of the capacitors
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