scholarly journals Short Circuit Fault Detection against High Thermal Background Using a Two-Level Scheme Based on DoG Filter

Complexity ◽  
2021 ◽  
Vol 2021 ◽  
pp. 1-13
Author(s):  
Xin Li ◽  
Yonggang Li ◽  
Hongqiu Zhu ◽  
Renchao Wu ◽  
Can Zhou
Keyword(s):  
Detection Method ◽  
Short Circuit ◽  
Infrared Image ◽  
Second Stage ◽  
Period Estimation ◽  
Key Factor ◽  
Difference Filter ◽  
Short Circuits ◽  
Short Circuit Fault ◽  
Thermal Background

Short circuit is a key factor which drastically affects the efficiency of metal electrorefining. Infrared image of the intercell busbar region is used to perform short circuit detection. To cope with the high thermal background, a two-level short circuit detection method is designed. Firstly, with background subtraction, high intensity short circuit electrodes, as well as the background, are removed, and normal working electrodes are preserved. In the second stage, suspicious short circuit areas are sifted out by normal electrode detecting and texture period estimation. Gaussian difference filter (DoG) which is based on the human visual system is improved to match the target gray distribution. A comparative experiment indicates that the proposed orthogonal DoG outperforms the original DoG and top-hat in the accuracy of normal electrode detection. The two-level detection method in this paper is applied in a copper electrolysis plant and exhibits superiority in locating short circuits and avoiding miss detection.

Study on Method Detecting Turn-to-Turn Short Circuit of Transformer Based on Kalman Filter

2014 ◽  
Vol 521 ◽  
pp. 371-374
Author(s):  
Yu Sheng Quan ◽  
Zong Cheng Zhang ◽  
Guang Chen ◽  
Dai Juan Wang
Keyword(s):  
Kalman Filter ◽  
Fault Diagnosis ◽  
State Transition ◽  
Short Circuit ◽  
Design Experiment ◽  
Measured Signal ◽  
Ground Current ◽  
Short Circuits ◽  
Transformer Core ◽  
Short Circuit Fault

Distribution transformer is an important device in the power system, once its failure can cause power outages. According to statistics, 70% -80% of the transformer accident was caused by a short circuit between the transformer turns. In this paper, the ground current of transformer core as the signal source, using Kalman filter techniques to approximate the measured signal, obtained state transition parameters of the prediction signal that most approximate the signal measured , Generated the inter-turn short circuit fault diagnostic parameters, based on the range of parameters to achieve the transformer inter-turn short circuits fault diagnosis. To verify this method, this paper design experiment, the results prove the validity and feasibility of the methods for fault diagnosis.

scholarly journals Oscillation-Based Test Applied to a Wideband CCII

VLSI Design ◽  
2017 ◽  
Vol 2017 ◽  
pp. 1-6 ◽  
Author(s):  
Pablo Petrashin ◽  
Luis Toledo ◽  
Walter Lancioni ◽  
Piotr Osuch ◽  
Tinus Stander
Keyword(s):  
Detection Rate ◽  
Short Circuit ◽  
Fault Simulation ◽  
Current Conveyors ◽  
Iddq Testing ◽  
Vlsi Test ◽  
Frequency Output ◽  
Short Circuits ◽  
First Time ◽  
Short Circuit Fault

Oscillation-based testing (OBT) has been proven to be a simple, yet effective VLSI test for numerous circuit types. This paper investigates, for the first time, the application of OBT verification for second generation current conveyors (CCIIs). The OBT is formed by connecting the CCII into a simple Wien bridge oscillator and monitoring both the amplitude and frequency of oscillation. The fault detection rate, taking into account both the open and short circuit fault simulation analyses, indicates 96.34% fault coverage using a combination of amplitude and frequency output sensing in all technology corners. The only nondetected faults are short circuits between VDD and VSS, which can be detected using other techniques such as IDDQ testing. This method is found to be sensitive to resistor and capacitor process variation in the Wien bridge oscillator, but mitigating test steps are proposed.

Designing of Micro-Motor Rotor Winding Fault Detection System Based on DSP

2014 ◽  
Vol 1030-1032 ◽  
pp. 1469-1474
Author(s):  
Dao Wei Gong ◽  
Ming Quan Shi ◽  
Zhen Feng Han ◽  
Xiao Dong Wang
Keyword(s):  
Fault Detection ◽  
Production Line ◽  
Detection Method ◽  
Detection System ◽  
Short Circuit ◽  
Test Method ◽  
Production Testing ◽  
Pulse Test ◽  
Rotor Winding ◽  
Short Circuit Fault

With the production line testing requirement of the micro-motor rotor which is less than 10mm in diameter, an improved rotor detection method based on the pulse test method was presented for the rotor fault detection. This paper analyzed the operating principle of the method and simulated on the Matlab platform. Moreover, the rotor detection system centered on the DSP processor was designed to detect the rotor fault. The result showed that the method could quickly and accurately detect the inter-turn short circuit fault and determine the deep of short circuit. The degree of detection is up to 4% level, which meets the actual production testing requirement.

scholarly journals An accurate inter-turn short circuit faults model dedicated to induction motors

2021 ◽  
Vol 11 (1) ◽  
pp. 9
Author(s):  
Fatima Babaa ◽  
Ouafae Bennis
Keyword(s):  
Induction Motors ◽  
Model Simulation ◽  
Short Circuit ◽  
Induction Machine ◽  
Industrial Systems ◽  
Proposed Model ◽  
Three Phase ◽  
Fault Prognosis ◽  
Short Circuits ◽  
Short Circuit Fault

Safety, disponibility and continuity of industrial systems are major issue in maintenance. In the last decades, these points are the important axes in the field of research. In fact, in many industrial processes research has picked up a fervent place and a particular importance in the area of fault diagnosis of electrical machines, in fact, a fault prognosis has become almost indispensable. The need of a mathematical model of three-phase induction machine, suitable for the simulation of machines behaviour under fault conditions, has received considerable attention. The paper presents a new practical and more precise model for induction motors after introducing inter turn short circuits faults. The proposed model is based on coupled magnetic circuit theory, capable to take into account any electrical asymmetry conditions. To verify the exactitude and the effectiveness of the model, simulation results for induction machine under interturn short circuit fault are presented. In spite of its simplicity, the proposed model is able to provide useful indications for diagnostic purposes. Experimental study is presented at the end of the paper to show that the proposed model predicts the induction machine behavior with a good accuracy.

scholarly journals An Infrared Image-based Copper Electrolysis Short-Circuit Detection Method using Improved DoG Filter

2018 ◽  
Vol 51 (21) ◽  
pp. 82-87
Author(s):  
Xin Li ◽  
Yonggang Li ◽  
Hongqiu Zhu ◽  
Xiaoxu Hu
Keyword(s):  
Detection Method ◽  
Short Circuit ◽  
Infrared Image

scholarly journals Advantage to Short Circuit Current of Calculation on Power System by the MVA Method

2020 ◽  
pp. 28-36
Author(s):  
Ming-Jong Lin
Keyword(s):  
Power System ◽  
Short Circuit ◽  
Short Circuit Current ◽  
Parallel Method ◽  
Basic Principles ◽  
Actual Equipment ◽  
Traditional Algorithm ◽  
Short Circuits ◽  
Simplified Procedures ◽  
Short Circuit Fault

The short circuit current of the equipment must be carefully calculated. If it is not effective to isolate the fault point, while the system is abnormal. That will leads to prolonged fault time and the instability of power system. The calculation process is very so complicated that must to establish any capacity of equipment on system. This article will introduce method of the traditional algorithm beginning. Next, to establish the basic principles of simplified procedures such as the capacity of two parallel devices are considered as a series method (plus), but the capacity of two series devices are considered as a parallel method to calculate. Finally, to calculate the fault short-circuits current based on the actual equipment capacity on the power system. Another technique is to transform the structure of transmission line from △ to Y so that it easy to simplify for calculation. It is proved to be a simple and easy to understand what method for short circuit fault current of calculation. The method can provide accurate and effective calculation of system short circuit capacity and current at each equipment point, so that designer can make appropriate specifications in design and procurement to avoid wasteful investment.

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