【作者】 彭席汉；

【导师】 杨世锡； 严拱标；

【作者基本信息】 浙江大学 ， 机械制造及其自动化， 2006， 硕士

【摘要】 变压器是电力系统中重要的电气设备，对其运行状态进行在线的实时监测是预防重大事故发生的有效手段。本论文结合“基于温度场模型及特征提取的大型变压器远程监诊方法与技术的研究”(No：50574814)国家自然基金项目，研究与开发了变压器DGA智能在线监测仪。论文从智能仪器仪表的角度出发，利用嵌入式系统技术、数据采集处理技术、工业以太网总线技术以及GPRS无线网络通信技术，实现了变压器DGA在线监测仪的基本功能：对六种变压器故障特征性气体信号进行采集、处理以及与上位机(监控中心)之间的数据通信，在此基础上，又研究并初步实现了监测仪的在线诊断、在线识别以及在线软件升级等智能化功能。 本论文的主要内容如下： 第一章 介绍了国内外变压器DGA在线监测装置的发展现状，分析了两种已应用于实际生产中的典型产品，论述了变压器DGA在线监测装置的发展趋势，最后，提出了本论文的具体研究内容和目标。 第二章 分析了变压器DGA智能在线监测仪的功能，提出了基于嵌入式监测仪底层平台的模块化设计方案。研究了监测仪数据采集与处理、数字化通信、智能化功能以及监测仪底层平台的实现技术。 第三章 结合监测仪的应用特点，对嵌入式微处理器和嵌入式操作系统做了比较和选择，构建了以嵌入式ARM微处理器S3C4510B为核心的硬件平台和以μC／OS-Ⅱ为嵌入式操作系统的软件平台。分析了保证底层平台稳定、可靠运行的方法，对底层平台进行了测试。 第四章 设计了六种特征性气体信号的采集电路，开发了数据采集、线性化处理的程序。针对半导体气敏传感器对温度以及非目标气体存在的交叉干扰问题，研究了多传感器数据融合的处理算法。 第五章 根据应用场合不同，设计了分别应用工业以太网总线技术和无线GPRS网络技术的两种监测仪通信方式。移植了一个嵌入式TCP／IP协议栈1wIP，开发了监测仪GPRS拨号上网程序。采用MODBUS／TCP应用层协议，设计了通信数据帧的格式，最终实现了监测仪与上位机之间的有效通信。 第六章 研究了监测仪的在线识别、在线软件升级以及在线诊断等智能化功能。在借鉴IEEE 1451标准中有关TEDS格式定义的基础上，实现了监测仪在线识别功能；利用现场通信技术以及Flash编程技术，实现了监测仪在线软件升级功能；而监测仪在线诊中则实现了CPU诊断、RAM诊断、ROM诊断以及数据采集通道诊断。 第七章 对全文进行了总结，并对今后的研究和开发工作提出了展望。更多还原

【Abstract】 Transformer is an important electric device in power system, and on-line real-time monitoring of its status is an effective measure to prevent severe accidents from happening. Based on "Research on Remote Monitoring and Diagnosis Methods of Large Transformer Based on Temperature Field Model and Feature Extracting" (National Natue Science Fund Project, No: 50574814), this paper put forwad the subject of "Research and Development on Transformer DGA Smart on-line Monitoring Instrument". From the viewpoint of smart instruments, we employ the thchnology of embedded system, data acquisition and processing, industrial Ethernet and GPRS wireless network communication to realize transformer DGA on-line monitoring instrument’s basic functions, which include data acquisition of six transformer’s fault-feature gases and communication between the instrument and upside monitoring center. Moreover, we studied and realized on-line diagnosis, on-line identification and on-line software upgrade these three instrument’s intelligent functions.This paper’s main contents are shown as follows:Chapter One: It introduced the developing state of transformer DGA on-line monitoring instruments at home and abroad, analyzed two typical products in detail which is in real use. Afterwards, it conluded the trend of transformer DGA on-line monitoring equipments. At last, the research contents and goal of this paper is put forward.Chapter Two: It analyzed the transformer’s overall functions, and put forward the plan of building up embedded monitoring instument’s lower platform. We also studied monitoring instrument’s realization technology for data acquisition, data communication, intellectual functions and lower platform.Chapter Three: According to characteristics of monitoring instrument, we compared several kinds of embedded microprocessors and embedded operating systems, and chose ARM CPU S3C4510B as core of the hardware platform, μC/OS-II as core of software platform. After lower platform is built up, we analyzed the way of making it stable and reliable. Then we tested the lower platform.Chapter Four: We designed data acquisition hardware circuit of six fault-feature gases, developed data acquisition and linearization software. In order to solve the cross interference of none-measured gas and temperature to gas sensors, we studied the method of data fusion of multi-sensors.Chapter Five: According to different operating situations, we provided two ways to communicate with upper computer: industrial Ethernet and GPRS wireless network. We ported a embedded TCP/IP stack 1wIP, and developed GPRS dialing software. Using MODBUS/TCP application layer protocol, this chapter designed the format of data frame, and the communication between monitoring instrument and upper computer was realized.更多还原