The Study Of Novel Method To Measure Moisture Content In Transformer Oil Based On Terahertz Technology

2020 ◽  
Author(s):  
Tingtin Wang ◽  
Jing Yin ◽  
Li Cheng ◽  
Fuzeng Zhang ◽  
Zhidong Cheng
Keyword(s):  
Moisture Content ◽  
Transformer Oil ◽  
Measure Moisture Content ◽  
Terahertz Technology ◽  
Novel Method

Hydrothermal Enhancement of Horizontal Ground Source Heat Pump

2020 ◽  
Author(s):  
Anthony A. DiCarlo
Keyword(s):  
Moisture Content ◽  
Heat Pump ◽  
Ground Source Heat Pump ◽  
Dynamics Model ◽  
Computational Fluid Dynamics Model ◽  
Winter Conditions ◽  
Ground Source ◽  
Thermal Phenomenon ◽  
Novel Method ◽  
Porous Soil

Abstract This study investigates a novel method for controlling the thermal conductivity of soil to enhance the performance of a horizontal ground source heat pump (GSHP). The method calls for irrigation lines to be buried in parallel with the ground pipes for the distribution of water in the area around the pipes thereby contributing to and controlling the soil’s moisture content. The controlled distribution of water within the porous soil promotes heat paths improving the performance of the GSHP system based on the transient seasonal spatial-temporal conditions. A computational fluid dynamics model of the porous soil is developed to simulate the hydro-thermal phenomenon over a short duration (40 hours) during winter conditions. The model is employed to investigate the heat transfer rate between the ground and pipes when the soil’s moisture content is modified and how this affects performance.

scholarly journals Moisture content as an important integral parameter of transformer oil quality in power transformers of 10/0.4 kV substations

2019 ◽  
Vol 124 ◽  
pp. 05008
Author(s):  
V Trushkin ◽  
S Shlyupikov ◽  
G Eroshenko ◽  
M Levin ◽  
S Kifarak
Keyword(s):  
Moisture Content ◽  
Oil Quality ◽  
Transformer Oil ◽  
Power Transformers ◽  
Main Element ◽  
Integral Parameter ◽  
Information Analysis ◽  
Sample Test ◽  
Long Time ◽  
Transformer Insulation

The main element characterizing the transformer efficiency is the state of its isolation, and the first thing is operating oil, which can perform its functions for a long time with timely restoration of its properties. Transformer oil is the main dielectric being in contact with the external environment, interacting with solid insulation and carrying a large amount of diagnostic information. Analysis of the development of transformer insulation damage showed that the main catalyst for accelerating the aging process of the oil is the appearance of moisture in it. This effect is enhanced by oxygen, temperature, the catalytic action of metals, oxidation and other factors. To confirm the influence of moisture content in oil on the deterioration of its properties, a statistical analysis of the oil sample test protocols was carried out. The obtained data allowed us to determine the moisture content as an important integral parameter of oil quality. Recommendations are given on the inclusion of a moisture content parameter in a set of mandatory requirements, in particular, for 10/0.4 kV consumer transformer substations equipped with silica gel air dryers

scholarly journals Tubule density at different sample sites around the Stratum medium of horse hoof horn

2004 ◽  
Vol 32 ◽  
pp. 173-175
Author(s):  
L Hopegood ◽  
D Abraham ◽  
C Shervey
Keyword(s):  
Mechanical Properties ◽  
Moisture Content ◽  
Unit Area ◽  
Microscopic Analysis ◽  
Grid Method ◽  
Significant Difference ◽  
Novel Method ◽  
Resistance To Wear ◽  
Equine Hoof

Microscopic analysis shows that equine hoof wall is composed of distinct phases of tubular and intertubular horn. The tubule density (TD) of hoof horn is found by ascertaining the number of tubules per unit area and is believed to relate to mechanical properties, resistance to wear, “quality”, hardness and moisture content. The straight grid previously used to ascertain the TD of hoof horn may omit certain tubules on both the inner and outer hoof wall as the wall itself is curved. This present study examined whether there was a significant difference in results for TD between using the conventional straight grid method and a novel method using a curved grid. TD was also compared across three sample sites. An analysis of TD from four equal sections (zones) across the hoof wall was also carried out.The left fore feet of 10 randomly selected slaughterhouse horses and ponies were used to provide hoof samples.

Moisture Content Measurement in Transformer Oil Using Micro-nano Fiber

2020 ◽  
Vol 27 (6) ◽  
pp. 1829-1836
Author(s):  
Jun Jiang ◽  
Xuerui Wu ◽  
Zhuowei Wang ◽  
Chaohai Zhang ◽  
Guoming Ma ◽  
...  
Keyword(s):  
Moisture Content ◽  
Transformer Oil ◽  
Content Measurement ◽  
Nano Fiber ◽  
Moisture Content Measurement

Research on Monitoring of Moisture Content in Transformer Oil by Using Sensors

2013 ◽  
Vol 684 ◽  
pp. 486-490 ◽  
Author(s):  
Qiang Fu ◽  
Meng Jun Wang ◽  
Wei Su ◽  
Yi Hua Qian ◽  
Guo Hua Lu
Keyword(s):  
Moisture Content ◽  
Temperature Sensor ◽  
Humidity Sensor ◽  
Transformer Oil ◽  
Moisture Distribution ◽  
Characteristic Parameters ◽  
On Line ◽  
Variation Mechanism ◽  
Capacitive Humidity Sensor

The moisture distribution in the transformer and variation mechanism of moisture in oil is analyzed in this paper, and using relative saturation and temperature as characteristic parameters, a detail scheme of on-line monitoring moisture content in transformer oil is put forward. The polyimide-based capacitive humidity sensor and temperature sensor are employed in on-line monitoring moisture content in oil. Computer is utilized to sample and analyze the data that sensors send out. The experiment on test transformer confirms that the sensors can work reliably, and reflect the moisture content in transformer oil accurately. The method that the paper proposes can realize the purpose of on-line monitoring.

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

Moisture Content Measurements on Sawdust With Radio Frequency Spectroscopy

2005 ◽  
Author(s):  
Jenny Nystro¨m ◽  
Eva Thorin ◽  
Stefan O. Backa ◽  
Erik Dahlquist
Keyword(s):  
Moisture Content ◽  
Radio Frequency ◽  
Bulk Density ◽  
Power Plants ◽  
Partial Least Square ◽  
Biomass Fuel ◽  
Average Moisture Content ◽  
Small Scale ◽  
Measure Moisture Content ◽  
Radio Frequency Spectroscopy

The aim of the research described in this paper is to measure moisture content in biomass fuel with radio frequency spectroscopy. The advantage with this method is that radio waves penetrate large samples, and thereby gives an average moisture content representing the whole sample. The method is fast and is a small scale version of what can be applied in the future on-line for biomass fuel arriving in containers to the power plants. The moisture content is determined with a sensor that measure attenuation and phase shift for a frequency spectrum from 310 MHz to 900 MHz. The measurements are performed on sawdust with moisture contents normally occurring in power plants (from 34 to 65%). Multivariate data analysis is used for evaluation of the dielectric spectra from samples with known moisture content. Our results show that it is possible to measure moisture content in sawdust using radio frequency spectroscopy. A partial least square model is built on samples from sawdust. The moisture content varied between 34 and 60%. A standard error for the cross validation of 0.99% and a correlation factor of 0.99 was received. It is known that dielectric properties are also influenced by bulk density and temperature. Tests show that the influence of the bulk density is of greater importance. Further calibration measurements have to be performed to be able to make reliable measurements on the different bio fuels used at power plants.

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