扫频短路阻抗法变压器绕组变形测试仪的研制及其应用研究

发布时间：2019-05-28 12:18

【摘要】：变压器在运行过程中,由于绕组变形而引发的变压器故障变得越来越常见,已严重威胁着电网的稳定运行。当变压器绕组发生变形后,能快速、有效的对绕组状态做出判断并对其做出相应的处理,减少因此而引发的变压器故障,具有非常大的现实意义。目前,诊断变压器绕组变形的方法主要有频率响应分析法和低电压短路阻抗法,两种方法的相关标准已经颁布。并在诊断绕组变形方面起到了一定的作用。然而,由于频率响应分析法测试中使用的激励信号比较小,容易受现场干扰,并且对电感的变化反应不灵敏;而低电压短路阻抗法由于对轻微的绕组变形反应不敏感。所以两种测试方法都不能全面的对绕组的状态做出诊断,应用中容易产生漏判和误判。为了能比较全面的对绕组的状态做出诊断,一种结合上面两种测试方法优点的扫频短路阻抗法成了现在研究的重点。为了使该方法尽快的应用到实际变压器绕组变形的诊断工作中,本文从扫频短路阻抗法测试原理出发,对基于该方法的测试仪进行了研制,并利用样机对扫频短路阻抗法的现场测试应用做了研究。论文的主要内容:(1)理论研究。分析了现有绕组变形诊断方法的原理和测试方法。重点对扫频短路阻抗法的测试原理和测试方法进行了研究。(2)样机的研制。根据扫频短路阻抗法的测量原理和方法,提出了样机的功能组成,并就每一功能的实现方法进行了研究和实现。其中包括:测试仪硬件电路的设计和上位机测试软件的开发,并对样机的性能进行了验证。(3)扫频短路阻抗法的应用研究。主要包括扫频短路阻抗法现场测试接线方法的研究;变压器副边绕组短接后是否接地和变压器引线是否拆除等影响测量结果的因素进行了试验研究。论文成果主要为:对扫频短路阻抗法的测试原理进行了研究,并研制了应用于该测试方法的测试仪样机,并通过现场和试验室的试验对样机的性能进行了验证。最后利用样机对扫频短路阻抗法的现场测试接线方法和可能影响测试结果的因素进行了研究。
[Abstract]:In the process of transformer operation, transformer faults caused by winding deformation become more and more common, which has seriously threatened the stable operation of power grid. When the transformer winding is deformed, it is of great practical significance to judge the winding state quickly and effectively and deal with it accordingly, so as to reduce the transformer fault caused by it. At present, the main methods to diagnose transformer winding deformation are frequency response analysis method and low voltage short circuit impedance method, and the related standards of the two methods have been promulgated. It also plays a certain role in the diagnosis of winding deformation. However, because the excitation signal used in the frequency response analysis method is relatively small, it is easy to be interfered by the field and insensitive to the change of inductance, while the low voltage short circuit impedance method is insensitive to the slight winding deformation response. Therefore, the two test methods can not make a comprehensive diagnosis of the state of the winding, and it is easy to misjudge and misjudge in the application. In order to diagnose the state of windings comprehensively, a sweep short circuit impedance method, which combines the advantages of the above two testing methods, has become the focus of current research. In order to make this method be applied to the diagnosis of transformer winding deformation as soon as possible, based on the testing principle of sweep short circuit impedance method, the tester based on this method is developed in this paper. The field test application of sweep short circuit impedance method is studied by using the prototype. The main contents of this paper are as follows: (1) theoretical research. The principle and test method of the existing winding deformation diagnosis methods are analyzed. The testing principle and method of sweep short circuit impedance method are studied. (2) the development of prototype. According to the measuring principle and method of sweep short circuit impedance method, the functional composition of the prototype is put forward, and the realization method of each function is studied and realized. It includes the design of the hardware circuit of the tester and the development of the upper computer test software, and the performance of the prototype is verified. (3) the application of sweep short circuit impedance method. It mainly includes the research of field test wiring method by sweep short circuit impedance method, the factors that affect the measurement results, such as whether the transformer auxiliary side winding is grounding after short connection and whether the transformer lead is removed or not. The main results of this paper are as follows: the testing principle of sweep short circuit impedance method is studied, and a prototype of the tester applied to the test method is developed, and the performance of the prototype is verified by field and laboratory tests. Finally, the field test wiring method of sweep short circuit impedance method and the factors that may affect the test results are studied by using the prototype.
【学位授予单位】：中国电力科学研究院
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM41

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