变压器局部放电在线监测系统研究及应用

发布时间：2018-05-11 04:22

本文选题：变压器 + 局部放电　；参考：《华北电力大学》2014年硕士论文

【摘要】：电力变压器局部放电会促使油纸绝缘老化并不断恶化甚至造成击穿，是影响变压器安全稳定运行的重要因素，局部放电在线监测能够有效地反映变压器内部绝缘系统运行工况状态，对提前预防事故发生和问题点的不断扩大有着重要的现实意义，目前已成为电力设备状态检修研究的热点。本文通过继承和总结国内外先进的研究经验，，在UHF传感器、HFCT传感器、AE传感器等局部放电信号采集设备的配合下，以图形化编程语言LabVIEW7.1作为软件平台编程核心，开发并完成了一套基于电-声联合的变压器局部放电在线检测系统。该系统集合了UHF超高频检测、HFCT高频电流检测、AE超声波检测等优点，克服了传统孤立系统不能对变压器内部局部放电不能较全面监测的弊端，有效提高了局放测量的灵敏度、定位的精确性和抗干扰能力扰。软件上，采用集成模块化设计，有助于提高监测系统数据运算分析的速率和可靠性。另外该系统通过与变压器内部结构的优化设计后整合内嵌安装，减小了系统对变压器本身电磁平衡的干扰，提高了系统的灵敏度和抗干扰能力。通过对110/10kV地下变电站3台主变在线运行实测数据分析结果表明：电-声联合在线监测系统在变压器局部放电检测与分析方面的应用是可行和有效的，而且系统各项功能均已达到了设计要求，能够为变压器状态检修提供大量可信的数据依据。
[Abstract]:Partial discharge of power transformers will cause the aging of oil-paper insulation and even lead to breakdown, which is an important factor affecting the safe and stable operation of transformers. On-line partial discharge monitoring can effectively reflect the operating conditions of the internal insulation system of the transformer, which is of great practical significance for the prevention of accidents in advance and the continuous expansion of the problem points. At present, it has become a hot spot in the research of power equipment condition-based maintenance. Through inheriting and summing up the advanced research experience at home and abroad, with the cooperation of partial discharge signal acquisition equipment such as UHF sensor, AE sensor and so on, the graphical programming language LabVIEW7.1 is used as the programming core of software platform. A transformer partial discharge detection system based on electro-acoustic combination is developed and completed. The system combines the advantages of UHF ultra-high frequency current detection and AE ultrasonic detection. It overcomes the shortcoming that the traditional isolated system can not monitor the partial discharge in the transformer completely, and improves the sensitivity of partial discharge measurement effectively. Accuracy and anti-interference ability of positioning. In software, integrated modular design is used to improve the speed and reliability of data operation and analysis of monitoring system. In addition, the system is integrated with the optimal design of the transformer internal structure, which reduces the interference of the system to the electromagnetic balance of the transformer itself, and improves the sensitivity and anti-interference ability of the system. Through the analysis of the measured data of three main substations in 110/10kV underground substation, the results show that the application of the combined electro-acoustic on-line monitoring system in the detection and analysis of transformer partial discharge is feasible and effective. All functions of the system have met the design requirements and can provide a large amount of reliable data basis for transformer condition maintenance.
【学位授予单位】：华北电力大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM855;TM41

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