基于频域介电谱法的绝缘诊断装置

发布时间：2018-04-27 13:47

本文选题：频域介电谱法 + 级联放大器　；参考：《哈尔滨理工大学》2016年硕士论文

【摘要】：变压器是电力系统中的重要组成设备,其运行状态是决定电力系统稳定运行的关键。由于我国近十几年电力工业快速发展,电力设备尤其是变压器老化问题日益突出,因而对变压器进行绝缘诊断显得尤为必要。但是变压器的老化状态评估依然没有可靠的评估措施,依靠传统经验评估变压器运行状态明显不足以保证评估的可信度。大量的统计表明,变压器的故障主要是绝缘劣化导致。研究变压器状态检测方法,并依此设计合理的诊断设备,对变压器的利用率及整个电力系统都具有重要的意义。本文首先阐述了频域介电谱绝缘诊断方法的原理,利用数学表达式推导出表征参数量;同时利用光电耦合器作为隔离措施以及高电压级联方法设计了高压线性级联放大器作为电介质测试的激励源;通过改进常见的微电流测试电路设计了新型的p A级交流微电流测量模块;在完成硬件电路的基础上,利用LABVIEW和数据采集卡搭建测试装置,实现了对微弱交流信号的测量与零相移滤波。本文在实验室条件下对老化的油纸绝缘进行了测试,测试曲线可达到国外同类仪器标准,同时对10kV变压器的主绝缘进行了测试,测量结果表明本装置可以较好的屏蔽外部干扰信号。
[Abstract]:Transformer is an important equipment in power system, and its operating state is the key to the stable operation of power system. Due to the rapid development of power industry in China in the past ten years, the aging problem of power equipment, especially transformers, has become increasingly prominent, so it is particularly necessary to diagnose the insulation of transformers. However, there is still no reliable evaluation method for the aging status of transformers, and it is obviously not enough to evaluate the operational status of transformers by traditional experience. A large number of statistics show that transformer fault is mainly caused by insulation deterioration. It is of great significance for transformer utilization and the whole power system to study the method of transformer condition detection and to design reasonable diagnostic equipment. In this paper, the principle of dielectric spectrum insulation diagnosis in frequency domain is introduced, and the representation parameter is derived by mathematical expression. At the same time, the high voltage linear cascade amplifier is designed as the exciting source of dielectric test by using the optocoupler as the isolation measure and the high voltage cascade method. By improving the common micro-current testing circuit, a new type of AC micro-current measurement module of PA level is designed. On the basis of completing the hardware circuit, the testing device is built by using LABVIEW and data acquisition card. The measurement of weak AC signal and zero phase shift filter are realized. In this paper, the aging oil-paper insulation is tested under laboratory conditions. The test curve can meet the standards of the same kind of foreign instruments. At the same time, the main insulation of 10kV transformer is tested. The measurement results show that the device can shield the external interference signal well.
【学位授予单位】：哈尔滨理工大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TM855

【相似文献】