Quantitative assessment of moisture content in transformer oil-paper insulation based on extended Debye model and PDC

2016 ◽  
Author(s):  
Xia Guoqiang ◽  
Wu Guangning
Keyword(s):  
Moisture Content ◽  
Quantitative Assessment ◽  
Debye Model ◽  
Transformer Oil ◽  
Paper Insulation

The Simulation Study on Transformer Oil-Paper Insulation Polarization Spectrum

2013 ◽  
Vol 385-386 ◽  
pp. 1175-1178
Author(s):  
Jun Qiang Zhang ◽  
Tao Zhao ◽  
Yun Peng Liu
Keyword(s):  
Time Constant ◽  
Simulation Analysis ◽  
Debye Model ◽  
Diagnostic Methods ◽  
Transformer Oil ◽  
Equivalent Model ◽  
Polarization Spectrum ◽  
Paper Insulation ◽  
Transformer Insulation ◽  
Non Destructive

Return voltage diagnostic method is an effective method of non-destructive diagnosis in transformer insulating state. The current study is that through experiments get polarization spectrum to analysis the transformer insulating state, but not yet carried out the influence of various factors to the experimental results. So, based on the Debye model and specific parameters comes from one equivalent model of the actual transformer, this paper using RVM methods to simulation analysis maximum return voltage and dominant time constant under different factors. Simulation results show that the diagnostic methods that combine maximum return voltage value with dominant time constant can preferably reflect the transformer insulation state.

scholarly journals A New Method for Evaluating Moisture Content and Aging Degree of Transformer Oil-Paper Insulation Based on Frequency Domain Spectroscopy

Energies ◽  
2017 ◽  
Vol 10 (8) ◽  
pp. 1195 ◽  
Author(s):  
Guoqiang Xia ◽  
Guangning Wu ◽  
Bo Gao ◽  
Haojie Yin ◽  
Feibao Yang
Keyword(s):  
Moisture Content ◽  
Frequency Domain ◽  
Transformer Oil ◽  
New Method ◽  
Paper Insulation

A method for determining the natural moisture content of dentin in a clinical setting

2020 ◽  
Vol 1 (12) ◽  
pp. 36-39
Author(s):  
L. V. Iyashvili ◽  
Yu. A. Vinnichenko ◽  
A. V. Vinnichenko
Keyword(s):  
Composite Material ◽  
Moisture Content ◽  
Computer Program ◽  
Clinical Setting ◽  
Quantitative Assessment ◽  
Critical Mass ◽  
Filling Material ◽  
Adhesive Interaction ◽  
Natural Moisture Content ◽  
Hard Tissues

The purpose of the study is a quantitative assessment of the yield of dentinal fluid on the surface of the treated dentin of the tooth when restoring its structure with a composite filling material. To achieve this goal, digital images of the coronal parts of the teeth having formed carious cavities were used; virtual models of hard tissues of teeth recreated using specialized computer programs; A computer program that provides the ability to accurately determine the area of the treated dentin tooth. The results made it possible to draw the following conclusions: with an increase in the depth of the carious cavity, the amount of dentin fluid that can stand out on its surface (1–2 mm from the tooth cavity) sharply increases; with an increase in the area of the formed carious cavity (more than 30 mm2), the risk of release of a critical mass of dentinal fluid (more than 0.4 mg), which can adversely affect the strength of the adhesive interaction between the composite material and the hard tissues of the tooth, increases significantly; the same dynamics is observed with increasing time, at which there is the possibility of free exit of dentinal fluid to the surface of the cavity prepared for filling (more than 45 seconds).

Effect of cumulative moisture content on degradation of transformer paper insulation

2017 ◽  
Vol 24 (1) ◽  
pp. 611-618 ◽  
Author(s):  
Mohamadreza Ariannik ◽  
Ali Asghar Razi-Kazemi ◽  
Matti Lehtonen
Keyword(s):  
Moisture Content ◽  
Paper Insulation
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