Degradation of Phosphate Ester Hydraulic Fluid in Power Station Turbines Investigated by a Three-Magnet Unilateral Magnet Array
A three-magnet array unilateral NMR sensor with a homogeneous sensitive spot was employed for assessing aging of the turbine oils used in two different power stations. The Carr-Purcell-Meiboom-Gill (CPMG) sequence and Inversion Recovery-prepared CPMG were employed for measuring the 1H-NMR transverse...
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doaj-a13738a8080f408197d96a08cc60b1752020-11-24T20:43:47ZengMDPI AGSensors1424-82202014-04-011446797680510.3390/s140406797s140406797Degradation of Phosphate Ester Hydraulic Fluid in Power Station Turbines Investigated by a Three-Magnet Unilateral Magnet ArrayPan Guo0Wei He1Juan C. García-Naranjo2State Key Laboratory of Power Transmission Equipment & System Security and New Technology, Chongqing University, Chongqing 400044, ChinaState Key Laboratory of Power Transmission Equipment & System Security and New Technology, Chongqing University, Chongqing 400044, ChinaMRI Centre, Department of Physics, P.O. Box 4400, University of New Brunswick, Fredericton, NB E3B 5A3, CanadaA three-magnet array unilateral NMR sensor with a homogeneous sensitive spot was employed for assessing aging of the turbine oils used in two different power stations. The Carr-Purcell-Meiboom-Gill (CPMG) sequence and Inversion Recovery-prepared CPMG were employed for measuring the 1H-NMR transverse and longitudinal relaxation times of turbine oils with different service status. Two signal components with different lifetimes were obtained by processing the transverse relaxation curves with a numeric program based on the Inverse Laplace Transformation. The long lifetime components of the transverse relaxation time T2eff and longitudinal relaxation time T1 were chosen to monitor the hydraulic fluid aging. The results demonstrate that an increase of the service time of the turbine oils clearly results in a decrease of T2eff,long and T1,long. This indicates that the T2eff,long and T1,long relaxation times, obtained from the unilateral magnetic resonance measurements, can be applied as indices for degradation of the hydraulic fluid in power station turbines.http://www.mdpi.com/1424-8220/14/4/6797three-magnet arrayunilateral magnetic resonanceturbine oilspower stationaging accessmentT2eff,longT1,longrejection standard |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Pan Guo Wei He Juan C. García-Naranjo |
spellingShingle |
Pan Guo Wei He Juan C. García-Naranjo Degradation of Phosphate Ester Hydraulic Fluid in Power Station Turbines Investigated by a Three-Magnet Unilateral Magnet Array Sensors three-magnet array unilateral magnetic resonance turbine oils power station aging accessment T2eff,long T1,long rejection standard |
author_facet |
Pan Guo Wei He Juan C. García-Naranjo |
author_sort |
Pan Guo |
title |
Degradation of Phosphate Ester Hydraulic Fluid in Power Station Turbines Investigated by a Three-Magnet Unilateral Magnet Array |
title_short |
Degradation of Phosphate Ester Hydraulic Fluid in Power Station Turbines Investigated by a Three-Magnet Unilateral Magnet Array |
title_full |
Degradation of Phosphate Ester Hydraulic Fluid in Power Station Turbines Investigated by a Three-Magnet Unilateral Magnet Array |
title_fullStr |
Degradation of Phosphate Ester Hydraulic Fluid in Power Station Turbines Investigated by a Three-Magnet Unilateral Magnet Array |
title_full_unstemmed |
Degradation of Phosphate Ester Hydraulic Fluid in Power Station Turbines Investigated by a Three-Magnet Unilateral Magnet Array |
title_sort |
degradation of phosphate ester hydraulic fluid in power station turbines investigated by a three-magnet unilateral magnet array |
publisher |
MDPI AG |
series |
Sensors |
issn |
1424-8220 |
publishDate |
2014-04-01 |
description |
A three-magnet array unilateral NMR sensor with a homogeneous sensitive spot was employed for assessing aging of the turbine oils used in two different power stations. The Carr-Purcell-Meiboom-Gill (CPMG) sequence and Inversion Recovery-prepared CPMG were employed for measuring the 1H-NMR transverse and longitudinal relaxation times of turbine oils with different service status. Two signal components with different lifetimes were obtained by processing the transverse relaxation curves with a numeric program based on the Inverse Laplace Transformation. The long lifetime components of the transverse relaxation time T2eff and longitudinal relaxation time T1 were chosen to monitor the hydraulic fluid aging. The results demonstrate that an increase of the service time of the turbine oils clearly results in a decrease of T2eff,long and T1,long. This indicates that the T2eff,long and T1,long relaxation times, obtained from the unilateral magnetic resonance measurements, can be applied as indices for degradation of the hydraulic fluid in power station turbines. |
topic |
three-magnet array unilateral magnetic resonance turbine oils power station aging accessment T2eff,long T1,long rejection standard |
url |
http://www.mdpi.com/1424-8220/14/4/6797 |
work_keys_str_mv |
AT panguo degradationofphosphateesterhydraulicfluidinpowerstationturbinesinvestigatedbyathreemagnetunilateralmagnetarray AT weihe degradationofphosphateesterhydraulicfluidinpowerstationturbinesinvestigatedbyathreemagnetunilateralmagnetarray AT juancgarcianaranjo degradationofphosphateesterhydraulicfluidinpowerstationturbinesinvestigatedbyathreemagnetunilateralmagnetarray |
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