导　　师： 王永强

学科专业： 080803

授予学位： 硕士

作　　者： ;

机构地区： 华北电力大学

摘　　要： 目前干式变压器使用越来越广泛，但关于干式变压器的局部放电现象研究较少。正是基于此点，本文提出了将超声波-特高频联合定位法应用于干式变压器的局部放电研究上，对干式变压器进行局部放电在线监测。 本文首先分析了干式变压器的研究现状，介绍了在线监测研究现状以及定位的研究现状。然后介绍了特高频信号及超声波信号在干式变压器内部的产生以及传输衰减情况，设计并制作了用于特高频检测的宽频带天线以及超声波传感器，实验表明传感器设计合理、性能良好。利用LabVIEW软件平台，设计并开发了干式变压器的局部放电在线监测系统，简要介绍了该系统的硬件及软件部分。该系统的功能主要包括局部放电信号的采集、局部放电信号的分析、局部放电源的定位。最后针对传统的声-声定位法的缺点，提出了特高频-超声定位法，并对其算法的原理以及误差进行了分析。该方法相对于传统的声-声定位法，具有较高的灵敏度，抗干扰能力强以及定位误差小的优点。同时根据实验的要求我们设计了模拟干式变压器内部局部放电的针板放电模型，进一步检测在线监测系统的稳定性。通过实验我们可知该系统可以实现干式变压器的在线监测，并已经成功适用于海上平台主变压器的在线监测。 Now the use of the Dry-type transformer become more and more widely, butthe research about PD of it is few. Based on this point, we put forword the idea thatthe Ultrasonic and the Ultra-High-Frequency/(UHF/) method will be used in theDry-type transformer for monitoring the PD on-line in this thesis. In this thesis, firstly we analyze the present situation of the use of the Dry-typetransformer and the research status of the on-line monitoring research and locationof PD. Secondly we introduce the generation and transmission of the UHF andUltrasonic signal in the Dry-type transformer. We design the UHF antenna andUltrasonic sensor for detecting. The characteristic of the sensors are measured inlaboratory, which prove that the capability is good. On LabVIEW platform asoftware measuring system for tansformer partial discharge is developed. Brieflywe introduce the hardware and software of the system. The main function of thesystem includes the acquisition of the PD, the analysis of the PD, the location of theorigin of PD. Finally according to the Ultrasonic-Ultrasonic method, we putforward the Ultrasonic-UHF method, and analyse the principle and the error. Theadvantages of this method are the high sensitivity and the strong anti interferencecapability. We design the needle-plate model for imitating the PD based on theexperiment. Through the experiment we test the stability of the system. We knowthe system can be used for the on-line monitoring of the Dry-type transformerthrough the experiment. Now it has successfully been used for the monitoring of themain transformer on the platform of sea.

关 键 词： 干式变压器 局部放电 特高频检测 虚拟仪器 定位

分 类 号： [TM855]

领　　域： [电气工程]