摘要电力变压器是电力系统的重要元件之一，其运行可靠性直接关系到电力系统的安全和稳定。变压器油中溶解气体能够比较准确地反映变压器内部绝缘老化情况和内部故障情况。本文在针对变压器油中溶解气体的在线监测的方法进行了一些研究，介绍了油中溶解气体浓度与变压器故障的对应关系，提出了以油中溶解气体为特征的在线监测系统的原理和实施方案。文章介绍了对变压器油中气体的采集与分析过程，通过气敏传感器将气体的浓度信号转换成电压信号，并以AT89C51单片机和ADC0808模数转换器等元件设计了一种简易的变压器油中气体在线监测装置,仿真时用滑动变阻器代替气敏传感器，达到了预期的结果。65204

毕业论文关键词  电力变压器  气体  故障  在线监测  采集与分析  气敏传感器  

毕业设计说明书（论文）外文摘要

Title   The Research on The Technology of Online Monitoring of    Power Transformer                                                 

Abstract

The power transformer is one of the important components of the power system, and its operational reliability is directly related to the security and stability of the power system. Gases dissolved in Transformer oil can accurately reflect the insulation aging and fault conditions inside the transformer. In this paper, some research for on-line monitoring of gases dissolved in transformer oil is done. This paper also describes the correspondence between the concentrations of the gas dissolved in oil and faults of the transformer. In addition, this paper involves the principle and implementation of programs of on-line monitoring system which is characterized by gases dissolved in oil. The article describes the process of collection and analysis of gases, and describes the gas sensor which changes the gas concentration signal into a voltage signal. a simple on-line monitoring devices for gas dissolved in transformer oil are designed based on AT89C51 microcontroller and ADC0808 analog-to-digital converter and other components. In the simulation, In order to achieve the expected results, we use sliding rheostat instead of the gas sensor. 

Keywords  power transformer  gas  fault  on-line monitoring  collection and analysis  gas sensor  

目  次

1  绪论 1

1.1  课题研究的背景及意义 1

1.2  国内外研究现状 2

1.3  课题的主要工作 4

2  电力变压器在线监测及故障诊断方法 5

2.1  电力变压器常规在线监测的方法 5

2.2  DGA故障诊断方法 8

2.3 小结 14

3  油色谱在线监测原理 15

3.1  气相色谱分析的流程 15

3.2  色谱分析的工作原理 17

3.3  油色谱在线监测系统的工作原理 18

3.4 小结 23

4 数据采集分析系统的设计 24

4.1  数据采集分析的总体设计