摘要随着人类对电力越来越依赖,电力安全更应该受到重视｡电力电缆是电力传输的重要设备,其可靠性直接关系到整个电力系统的稳定｡XLPE电缆是目前应用最广泛的电力电缆,为了保障其稳定可靠运行,必须对其检测｡传统的离线检测较为落后,已不能满足未来发展的需要,通过在线监测技术实时监控其绝缘性能已是大势所趋｡国外己在XLPE电缆在线监测领域取得了一定成果,而国内研究较为滞后｡本文分析了XLPE电缆故障的原因,认为水树枝现象是导致电缆故障的主要因素;概述了XLPE电缆在线监测的研究现状,完成了基于直流成分法的XLPE电缆在线监测系统的设计与仿真｡在系统设计等方面,本文首先阐述了直流分量法的测量原理｡其次,详细介绍了系统各个部分的设计原因､设计方法和关键技术｡证明了本系统能够反映运行中电缆的老化程度,实现了XLPE电缆的在线监测｡82681

毕业论文关键词  XLPE电缆  在线监测  直流成分法

毕业设计说明书外文摘要

Title    On-line Monitoring of XLPE Power Cable Insulation Based on DC Component Method                       

Abstract People has been increasingly depending on electricity, while the electric safety should be paid more attention to。 Cables are the important component in the process of power transmission, whose reliability is directly related to the stability of the whole power system。 XLPE cables are the most widely used currently。 In order to ensure the stabilization and reliability during operation, they should be tested。 Traditional off-line tests are relatively out of date and are not able to satisfy the demand in the near future。 Meanwhile, the tendency of applying on-line XLPE cable monitoring technology is inevitable。 Certain achievements are made in the field of on-line XLPE cable monitoring system in foreign country, while studies in China are under-developed。 In this paper, reasons of fault in XLPE cable are analyzed。 Water tree phenomenon is supposed to be primary determinant cause of XLPE cable fault。 This paper summarizes the current research status of on-line XLPE cable monitoring system。 The design and simulation of on-line XLPE cable monitoring system are completed with the DC component method。 In aspect of system design, the theories of DC component method are elaborated in the first place。 Then the design method of each part of the system and key technologies are introduced。 Experiments show that this system can reflect the aging degree of a running XLPE cable to achieve the goal of the on-line monitoring of the XLPE cable。

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Keywords  XLPE  Cable;On-line  Monitoring;DCComponentMethod;

目   录

1 引言 1

1。1 本课题研究的背景和意义 1

1。2 本课题的主要工作 2

2 交联聚乙烯电力电缆绝缘老化机理及水树劣化模型仿真 3

2。1 交联聚乙烯电力电缆绝缘老化机理 3

2。2 水树枝劣化模型仿真 3

3系统的硬件设计 6

3。1电流采样模块 6

3。2放大电路 7

3。3滤波模块 8

3。4 A/D转换模块 11

3。5单片机 12

3。6显示电路 14

4。系统的软件设计