Thermal-Imaging Method for Monitoring the Insulation Condition of Oil-Filled Equipment

2020 ◽  
Vol 17 (7) ◽  
pp. 3141-3145
Author(s):  
B. R. Kangozhin ◽  
S. S. Dautov ◽  
M. S. Zharmagambetova ◽  
M. A. Kosilov
Keyword(s):  
Defect Detection ◽  
Thermal Imaging ◽  
Early Stage ◽  
Electrical Equipment ◽  
Imaging Method ◽  
Operating Voltage ◽  
Measured Temperature ◽  
Traditional Methods ◽  
Detection Criterion ◽  
Insulation Condition

The method of thermal imaging inspection allowing detecting defects at an early stage of their development is considered. The essence of the method consists in recalculation of measured temperature drops into insulating characteristics measured under operating voltage. It is shown that defects are detected at the early stage of their development using the defect detection criterion (tgδmeas-tgδcalc). It is concluded that it is possible to abandon a number of traditional methods of testing with electrical equipment shutdown.

Application of Infrared Thermal Imaging Technology in Liquid Ammonia Storages Inspection

2014 ◽  
Author(s):  
Yan-Lei Liu ◽  
Chen Tao ◽  
Bing Wang ◽  
Wei-Zhong Li ◽  
Gen-Fu Xu ◽  
...  
Keyword(s):  
Thermal Imaging ◽  
Liquid Ammonia ◽  
Electrical Equipment ◽  
Equipment Failure ◽  
Refrigeration System ◽  
System Safety ◽  
Infrared Thermal Imaging ◽  
Imaging Technology ◽  
Ammonia Storage ◽  
Insulation Condition

Liquid ammonia storage leakage accident occurred frequently in recent years. In this paper, the Infrared thermal imaging Technology had been presented by introducing the applications of liquid ammonia storage inspection. It was indicated that the infrared thermal imaging technology had irreplaceable advantages in equipment insulation condition assessment, funneled detection, heat level judgment, electrical equipment failure hidden. The experiments showed that infrared thermal imaging technology could provide scientific references for early diagnosis and preventive maintenance of devices. And it had widely application prospect in the ammonia refrigeration system safety inspections.

On the effect of the periodicity of diagnostic measurements on improving the reliability of high-voltage transformers

2019 ◽  
Vol 12 (1) ◽  
pp. 18-21
Author(s):  
V. A. Tikhonov
Keyword(s):  
Service Life ◽  
High Voltage ◽  
Chromatographic Analysis ◽  
Aluminum Industry ◽  
Early Stage ◽  
Diagnostic Methods ◽  
Transformer Oil ◽  
Operating Voltage ◽  
Dissolved Gases ◽  
The Aluminum Industry

The influence of the periodicity of diagnostic measurements on the operational state of high-voltage transformers is considered. Examples of defects of switching devices of converter transformers and methods for their detection are given. The rationale for the importance of recognition of defects at an early stage of their occurrence is given. The influence of the multiplicity of overvoltages on the service life of converter transformers in the aluminum industry is investigated. Based on the analysis of the service life of converter transformers of one of the powerful aluminum plants, where 83% of converter transformers have exhausted their standard service life, it is shown that in 40% of cases it would be possible to avoid their failures, with timely detection and elimination of emerging defects. Examples of defects of OLR (on-load regulators) of converter transformers and methods for their detection are given. The importance of recognition of defects at an early stage of their occurrence is substantiated. A method for chromatographic analysis of dissolved gases in transformer oil has been developed for the qualitative determination of defects and ways to eliminate them. Examples of diagnostics of converter transformers at operating voltage and working load are given, providing the best quality operational characteristics of converter transformers. The periodicity of diagnostic measurements and the reduction of defects and failures has been substantiated. The question of diagnosing the state of the converter transformer TDNP-40000/10 at an enterprise of the aluminum industry is investigated. Currently, diagnostic methods are being developed based on chromatographic analysis of dissolved gases in transformer oil. The presented method of evaluating the operating parameters of transformers allows for the safe operation of high-voltage transformers and enables to increase the reliability of the power supply scheme of aluminum industry plants.

scholarly journals Thermal Analysis of Stomatal Response under Salinity and High Light

2021 ◽  
Vol 22 (9) ◽  
pp. 4663
Author(s):  
Aleksandra Orzechowska ◽  
Martin Trtílek ◽  
Krzysztof Michał Tokarz ◽  
Renata Szymańska ◽  
Ewa Niewiadomska ◽  
...  
Keyword(s):  
Thermal Imaging ◽  
Initial Response ◽  
Co2 Assimilation ◽  
High Light ◽  
Stomatal Aperture ◽  
Imaging Method ◽  
Stomatal Response ◽  
Time Constants ◽  
Net Co2 Assimilation ◽  
Temporary Response

A non-destructive thermal imaging method was used to study the stomatal response of salt-treated Arabidopsis thaliana plants to excessive light. The plants were exposed to different levels of salt concentrations (0, 75, 150, and 220 mM NaCl). Time-dependent thermograms showed the changes in the temperature distribution over the lamina and provided new insights into the acute light-induced temporary response of Arabidopsis under short-term salinity. The initial response of plants, which was associated with stomatal aperture, revealed an exponential growth in temperature kinetics. Using a single-exponential function, we estimated the time constants of thermal courses of plants exposed to acute high light. The saline-induced impairment in stomatal movement caused the reduced stomatal conductance and transpiration rate. Limited transpiration of NaCl-treated plants resulted in an increased rosette temperature and decreased thermal time constants as compared to the controls. The net CO2 assimilation rate decreased for plants exposed to 220 mM NaCl; in the case of 75 mM NaCl treatment, an increase was observed. A significant decline in the maximal quantum yield of photosystem II under excessive light was noticeable for the control and NaCl-treated plants. This study provides evidence that thermal imaging as a highly sensitive technique may be useful for analyzing the stomatal aperture and movement under dynamic environmental conditions.

scholarly journals Surgical Approach to Anorectal Melanoma with PET-CT Staging: A Case Report

2017 ◽  
Vol 03 (04) ◽  
pp. e177-e180 ◽  
Author(s):  
Nilufer Bulut ◽  
Sevinc Dagıstanlı ◽  
Burcak Yılmaz ◽  
O. Atay
Keyword(s):  
Surgical Approach ◽  
Early Stage ◽  
Wide Spectrum ◽  
Surgical Approaches ◽  
Histopathological Diagnosis ◽  
Imaging Method ◽  
Medical Treatments ◽  
Good Imaging ◽  
Rectal Melanoma ◽  
Pet Ct

AbstractRectal hemorrhage should be evaluated within a wide spectrum ranging from benign diseases to a malignant process. Especially, the melanomas of rectum are detected at an advanced stage when diagnosed since the present symptoms of rectal melanomas are similar. The question of what will be the surgical approach with MR, CT, and PET-CT imaging methods performed after histopathological diagnosis still conserves its topicality. PET-CT is a good imaging method for determination of distant metastasis and lymphatic involvement. In the present case, a patient with early-stage rectal melanoma was treated with APR. No relapse/metastasis was detected during the 18-month follow-up. The aggressive course of the disease and its low response rates to medical treatments may cause the surgical approaches to be more extensive.

scholarly journals Thermographic Camera Use in Brake Oriented Friction Materials Tests / Użycie Kamery Termowizyjnej w Badaniach Hamulcowych Materiałów Ciernych

2015 ◽  
Vol 33 (1) ◽  
pp. 81-90
Author(s):  
Zbigniew Skorupka
Keyword(s):  
Thermal Imaging ◽  
Friction Pair ◽  
Infrared Emission ◽  
Contactless Measurement ◽  
Imaging Method ◽  
Friction Materials ◽  
Certification Testing ◽  
Contactless Testing ◽  
Thermographic Camera ◽  
Infrared Cameras

Abstract Friction brake temperature due to its influence on brakes’ operation is subject to many test and studies. Measurements methods of this important brake parameter are being continuously developed. In order to withstand difficulty in temperature evaluation in full brake system as well as in isolated friction pair is use of contactless measurement methods. Currently, the most widespread contactless testing method of the thermal effects is to measure infrared emission by pyrometers or thermographic (infrared) cameras. Thermal imaging method wasn’t used so far during aviation brake materials usefulness evaluation and certification testing performed in Instytut Lotnictwa Landing Gear Laboratory. In this paper, author described performed friction materials tests which were recorded with thermal imaging camera as well as evaluated usefulness of the method by comparing its accuracy to thermocouple measurement.

Dynamics of Evaporation and Cooling of a Water Droplet During the Early Stage of Depressurization

2009 ◽  
Author(s):  
L. Liu ◽  
Q. C. Bi ◽  
G. X. Wang
Keyword(s):  
Experimental Data ◽  
Water Droplet ◽  
Effective Conductivity ◽  
Numerical Study ◽  
Early Stage ◽  
Droplet Surface ◽  
Large Temperature ◽  
Measured Temperature ◽  
Equilibrium Evaporation ◽  
Electro Magnetic

This paper reports an experimental and numerical study of evaporation and cooling of a water droplet during the early stage of depressurization in a test vessel. During the experiment, a distilled water droplet was suspended on a thermocouple, which was also used to measure the droplet center temperature, and the droplet surface temperature was captured by an infrared thermograph. Experimental data indicated a large temperature difference within the droplet during the early stage of depressurization. A thermodynamic analysis of the experimental data found that the pressure reduction was not fast enough to induce liquid superheating and thus equilibrium evaporation was expected. A mathematical model was then constructed to simulate the droplet evaporation process. The model solves one-dimensional heat conduction equation for the temperature distribution inside the water droplet, with the convective heat transfer inside the droplet simplified through an effective conductivity factor. A simplified treatment was introduced to quantify the convective evaporation due to air movement and droplet swing induced by sudden opening of the electro-magnetic valve and the following air exiting. The model-predictions agree well with the measured temperature data, demonstrating the soundness of the present model.

scholarly journals Classification of Pneumonia Cell Images Using Improved ResNet50 Model

2021 ◽  
Vol 38 (1) ◽  
pp. 165-173
Author(s):  
Ahmet Çınar ◽  
Muhammed Yıldırım ◽  
Yeşim Eroğlu
Keyword(s):  
Error Rates ◽  
Lung Imaging ◽  
Imaging Method ◽  
Data Sets ◽  
Accuracy Rate ◽  
Traditional Methods ◽  
X Ray ◽  
Qualified Personnel ◽  
Patient Will

Pneumonia is a disease caused by inflammation of the lung tissue that is transmitted by various means, primarily bacteria. Early and accurate diagnosis is important in reducing the morbidity and mortality of the disease. The primary imaging method used for the diagnosis of pneumonia is lung x-ray. While typical imaging findings of pneumonia may be present on lung imaging, nonspecific images may be present. In addition, many health units may not have qualified personnel to perform this procedure or there may be errors in diagnoses made by traditional methods. For this reason, computer systems can be used to prevent error rates that may occur in traditional methods. Many methods have been developed to train data sets. In this article, a new model has been developed based on the layers of the ResNet50. The developed model was compared with the architectures InceptionV3, AlexNet, GoogleNet, ResNet50 and DenseNet201. In the developed model, the maximum accuracy rate was achieved as 97.22%. The model developed was followed by DenseNet201, ResNet50, InceptionV3, GoogleNet and AlexNet, respectively, according to their accuracy. With these developed models, the diagnosis of pneumonia can be made early and accurately, and the treatment management of the patient will be determined quickly.

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