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Raman spectroscopy based detection of corrosive sulfur in transformer oil:Method and application

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High Voltage 2022年第6期7卷 1175-1184页

作者： Ziyi wang Ruimin Song Weigen Chen Xinyuan Zhang pinyi wang State Key Laboratory of Power Transmission Equipment&System Security and New Technology Chongqing UniversityChongqingChina

In order to overcome the shortcomings of traditional methods for corrosive sulfur detection in transformer oil,Raman spectroscopy based detection is proposed in this *** widely concerned corrosive sulfur,Dibenzyl Disulfide(DBDS),was chosen as the characteristic molecule to be detected.A series of oil samples with different DBDS concentrations was *** these samples were extracted by 1-methyl-2-pyrrolidinone for DBDS enrichment to improve the sensitivity of *** Raman spectra of samples were obtained,and a linear model was established by analysing the relationship between the characteristic peak and the DBDS *** limit of detection reached 7.98 mg/*** determining the DBDS concentrations causing sulfur corrosion,the sulfur weight content on the copper conductor surface was measured by Scanning Electron Microscope-Energy Dispersive Spectrometer after a corrosion *** results show that the corrosion limitation highly depends on the type of transformer oil,and the Raman spectroscopy detection can meet the limit of detection requirement in practical ***,an on-site oil sample and five Lab-made samples were detected via our new method and the current Gas Chromatography-Mass Spectrometry based *** is found that there is no significant divergence between the measurement *** good applicability was also demonstrated in onsite sample test.

关键词： corrosion sulfur spectroscopy

Analysis of SF6 decomposed products by fibre-enhanced Raman spectroscopy for gas-insulated switchgear diagnosis

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High Voltage 2024年第1期9卷 206-216页

作者： Jianxin wang Weigen Chen pinyi wang Fu Wan Zhixian Zhang Shoufei Gao Yingying wang School of Electrical Engineering Chongqing UniversityChongqingChina State Key Laboratory of Power Transmission Equipment&System Security and New Technology Chongqing UniversityChongqingChina Institute of Photonics Technology Jinan UniversityGuangzhouChina

Sulphur hexafluoride(SF6)decomposed products analysis is highly critical in the earlystage fault diagnosis of gas-insulated switchgear(GIS).Spectrum technology outperforms traditional methods on non-invasiveness,no sample preparation,and no ***,the authors present an improved fibre-enhanced Raman spectroscopy(FERS)as a comprehensive analytical tool to detect a suite of SF_(6)decomposed products(SO_(2)F_(2),SOF_(2),SO_(2),H_(2)S,CF_(4),OCS,CO_(2),and CO).The FERS approach is combined with two iris diaphragms for spatial filtering and a rear-end reflector for additional Raman signal *** of detection down to 1×10^(−6)–8×10^(−6)are achieved for different SF6 decompositions,and quantification of an undefined multigas,sampled from an 800 kV GIS in service,is realised utilising SF6 as the internal standard gas and with a maximum error of 5.5%.The GIS is diagnosed according to the results and confirmed by an on-site *** authors foresee that this technique will provide a route for trace gas analysis in the power industry.

关键词： SF6 diagnosis fibre

A DYNAMIC SPECTRUM ACCESS NETWORK BASED ON COGNITIVE RADIO

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Journal of Electronics(China) 2010年第5期27卷 577-610页

作者： Ren pinyi wang Jun Li Shaoqian Department of Electronics and Information Engineering Xi＇an Jiaotong UniversityXi＇an 710049China

Dynamic spectrum access technologies based on Cognitive Radio(CR) is under intensive research carried out by the wireless communication society and is expected to solve the problem of spectrum ***,most enabling technologies related to dynamic spectrum access are con-sidered *** this paper,we consider these key technologies jointly and introduce a new implementation scheme for a Dynamic Spectrum Access Network Based on Cognitive Radio(DSAN-BCR).We start with a flexible hardware platform for DSAN-BCR,as well as a flexible protocol structure that dominates the operation of *** then focus on the state of the art of key technologies such as spectrum sensing,spectrum resources management,dynamic spectrum access,and routing that are below the network layer in DSAN-BCR,as well as the development of technologies related to higher *** but not the least,we analyze the challenges confronted by these men-tioned technologies in DSAN-BCR,and give the perspectives on the future development of these *** DSAN-BCR introduced is expected to provide a system level guidance to alleviate the problem of spectrum scarcity.

关键词： Cognitive Radio (CR) Dynamic Spectrum Access Network Based on Cognitive Radio (DSAN-BCR) Spectrum sensing Spectrum management Dynamic Spectrum Access (DSA) Cognitive routing

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A directional MAC protocol with long-range communication ability in ad hoc networks

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Science China(Information Sciences) 2012年第4期55卷 765-777页

作者： REN pinyi,FENG Jia & wang YiChen School of Electronics and Information Engineering,Xi’an Jiaotong University,Xi’an 710049,China 1. School of Electronics and Information Engineering Xi’an Jiaotong University Xi’an 710049 China

To address the problem that long-range communication capability in ad hoc networks using directional antenna is not generally utilized,a directional media access control (DMAC) protocol with long-range communication (LRC) capability in ad hoc networks is *** the LRC-DMAC,the intermediate node uses a long-range orientation (LRO) algorithm to help the transmitter obtain the directional information of the receiver which is two hops ***,the long-range link between such two hops nodes can be set *** to whether the received power information is available or not,we propose two types of LRO algorithm:without the received power information,a basic LRO obtains the approximate directional informa-tion of the long-range receiver by a geometric relationship;however,the LRO-PI can calculate the accurate directional information of the long-range receiver using the received *** analysis indicates that the LRO algorithm achieves high accuracy when the relevant parameters are properly *** results show that the establishment of long-range links can effectively improve the network throughput and reduce the end-to-end delay.

关键词： ad hoc networks directional antenna MAC

基于频率锁定吸收光谱技术的变压器故障特征气体检测研究

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中国电机工程学报 2017年第18期37卷 5504-5510+5550页

作者：万福陈伟根王品一王建新王美林输配电装备及系统安全与新技术国家重点实验室(重庆大学)

高准确度、高灵敏度检测故障特征气体是基于油中溶解气体分析的变压器早期潜伏性故障诊断的关键。该文开展了基于频率锁定吸收光谱技术的变压器故障特征气体检测研究。基于电四极跃迁理论,论证了H;等同核双原子分子同样存在吸收效应;为... 详细信息

高准确度、高灵敏度检测故障特征气体是基于油中溶解气体分析的变压器早期潜伏性故障诊断的关键。该文开展了基于频率锁定吸收光谱技术的变压器故障特征气体检测研究。基于电四极跃迁理论,论证了H;等同核双原子分子同样存在吸收效应;为提高H;最小浓度的检测极限,搭建了频率锁定腔增强吸收光谱气体检测平台,首次实现了基于吸收光谱技术的变压器故障特征气体H;的定性与定量检测分析,检测准确度与重复性分别达到约93.82%及94.35%。腔内气体压强为101k Pa时,H;最小检测浓度的实验值约为7.5μL/L,与计算值的相对偏差仅为3.8%。此外,基于激光器阵列技术,实现了其他6种变压器故障特征混合气体CO、CO2、CH;、C;H;、C;H;与C;H;的吸收光谱检测,其检测准确度与最小检测浓度同样满足变压器油中溶解气体分析的需求。该研究为研制基于频率锁定吸收光谱技术的变压器故障特征气体现场检测系统提供了理论依据和技术支撑。

关键词：油中溶解气体分析 H2吸收谱线电四极跃迁频率锁定增强腔激光器阵列

Rectangle blocking matrices based unitary multistage Wiener reduced-rank joint detection algorithm for multiple input multiple output systems

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Science China(Information Sciences) 2010年第10期53卷 2116-2126页

作者： REN pinyi 1 , wang Rui 2 & ZHANG ShiJiao 1 1 School of Electronic Engineering, Xi’an Jiaotong University, Xi’an 710049, China 2 Xi’an Monitoring Station, The State Administration of Radio Film and Television, Xi’an 710101, China 1. School of Electronic Engineering Xi’an Jiaotong University Xi’an 710049 China2. Xi’an Monitoring Station The State Administration of Radio Film and Television Xi’an 710101 China

Traditional equalization algorithms for multiple input multiple output (MIMO) systems suffer from high complexity and low convergence rate. So an improved adaptive reduced-rank joint detection algorithm of multistage Wiener filter (MSWF) based on rectangle blocking matrices is proposed. The MSWF is implemented by the correlation subtraction algorithm (CSA) structure and is called unitary multistage Wiener filter (UMSWF). The new scheme adopts rectangle submatrix as blocking matrix, which is chosen from the square blocking matrix for UMSWF. The proposed algorithm can reduce the size of the observation data vectors step by step in the forward recursion decomposition of UMSWF. Thus, the computational complexity is reduced and the convergence rate is increased. Theoretical analysis and simulation results show that this improved adaptive reduced-rank joint detection algorithm of UMSWF based on rectangle blocking matrix has better performance such as lower complexity and faster convergence rate. In particular, simulations are conducted in the verticalBell Labs layered space-time (V-BLAST) system which adopts BPSK modulation, where 4 and 8 antennas are equipped at the transmitter and receiver, respectively. Compared with traditional equalization algorithm based on UMSWF, our new method can achieve the same BER performance at high SNR with only 0.5 times that of computational complexity.

关键词： multiple input multiple output (MIMO) systems unitary multistage Wiener filter (UMSWF) joint detection blocking matrix

数据驱动的动车组车轮剩余寿命预测模型研究及应用

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中国工程机械学报 2024年第3期22卷 414-420页

作者：王连富王中尧王品一陈伯清中车长春轨道客车股份有限公司工程研究中心吉林长春130062 大连交通大学机械工程学院辽宁大连116033 西南交通大学牵引动力国家重点实验室四川成都610031

通过对车轮磨耗机理进行分析,研究车轮磨耗的影响因素。基于车轮运用检修数据,结合对车轮镟修流程的分析,采用数据驱动方法,先后建立轮径-轮缘厚的磨耗预测模型、轮径-轮缘厚镟修比例系数、目标轮缘厚确定逻辑的数学模型。再根据动车组... 详细信息

通过对车轮磨耗机理进行分析,研究车轮磨耗的影响因素。基于车轮运用检修数据,结合对车轮镟修流程的分析,采用数据驱动方法,先后建立轮径-轮缘厚的磨耗预测模型、轮径-轮缘厚镟修比例系数、目标轮缘厚确定逻辑的数学模型。再根据动车组车轮的检修情况,提出车轮剩余寿命预测方法,实现对车轮到限情况预测。根据实际应用情况,该成果可以指导生产管理部门提前备品备料、制定预算、安排换轮计划等,提高车轮运用检修效率,节约车轮运维成本。

关键词：车轮磨耗镟修数据驱动剩余寿命预测

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海洋平台用E36钢焊接工艺评定

石油工程建设 2014年第3期40卷 45-48页

作者：王品毅辽河石油勘探局油田建设工程二公司辽宁盘锦124012

研究了海洋平台常用E36高强钢的焊接工艺,对焊接后的试件进行了拉伸、弯曲、缺口冲击和表面硬度等力学性能试验,采用X射线衍射法对焊缝的焊后残余应力分布进行测试,得到了焊缝及附近区域的残余应力分布规律。试验结果表明,接头各项性能... 详细信息

研究了海洋平台常用E36高强钢的焊接工艺,对焊接后的试件进行了拉伸、弯曲、缺口冲击和表面硬度等力学性能试验,采用X射线衍射法对焊缝的焊后残余应力分布进行测试,得到了焊缝及附近区域的残余应力分布规律。试验结果表明,接头各项性能满足AWSD1.1标准的相关要求,制订的焊接工艺切实可行。

关键词：海洋平台 E36高强钢焊接工艺评定残余应力

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变压器油中气体拉曼光谱检测及信号处理方法

仪器仪表学报 2016年第11期37卷 2482-2488页

作者：万福杨曼琳贺鹏王建新王品一陈伟根重庆大学输配电装备及系统安全与新技术国家重点实验室

准确检测变压器油中溶解故障特征气体是诊断变压器运行状态的重要技术手段之一。论文基于拉曼光谱和腔长调制频率锁定原理,搭建了变压器故障特征气体频率锁定腔增强拉曼光检测平台,实现了H、CH、CH、CH、CH、CO、CO等七种故障特征气体... 详细信息

准确检测变压器油中溶解故障特征气体是诊断变压器运行状态的重要技术手段之一。论文基于拉曼光谱和腔长调制频率锁定原理,搭建了变压器故障特征气体频率锁定腔增强拉曼光检测平台,实现了H、CH、CH、CH、CH、CO、CO等七种故障特征气体的同时检测;1atm时,H、CH、CH、CH、CH、CO、CO的最小检测浓度实验值分别达到106、25、45、73、41、170、126(ppm)。频率锁定增强腔技术使最小检测浓度提高了约68倍。运用小波模极大值法对H的拉曼光谱检测信号进行了去噪处理,提出了基于包络线迭代法的光谱基线校正方法,校正后的光谱荧光背景残留减少,使气体拉曼光谱检测准确度提高了约2.95%,为变压器油中溶解故障气体同时准确检测提出了一种新方法。

关键词：变压器故障特征气体拉曼光谱检测频率锁定腔增强基线校正