基于ΔU-I曲线分析法的配电变压器故障在线检测  

Online Fault Detection Technology of Distribution Transformer Based on ΔU-I Locus Method

作　　者：蔡伟[1] 顾然[1] 李穆[1] 施磊[1] 

机构地区：[1]国网电力科学研究院武汉南瑞有限责任公司,武汉430074

出　　处：《高压电器》2016年第11期169-175,共7页High Voltage Apparatus

基　　金：国家电网公司科技项目(WNZ141-0012)~~

摘　　要：配电变压器直接面对终端用户,其健康水平及运行状况的好坏直接关系着供电安全与可靠性,关系着整个电网的安全与稳定。为了能够准确、有效地实现配电变压器故障检测,文中提出了一种基于ΔU-I曲线分析法的配电变压器故障在线检测方法。基于电路磁路对偶原理,文中搭建了变压器电路模型,分别求取了变压器一次侧、二次侧电压及一次侧电流,作出了对应的ΔU-I曲线。设置变压器轴向位移故障、泄漏故障等对不同变压器故障类型对ΔU-I曲线的影响进行了研究。研究发现,通过ΔU-I曲线的半长轴(a)、半短轴(b)、离心率(e)、包围面积(S)等特征参数能够实现对配电变压器故障的在线检测。To improve the accuracy and effectiveness of fault detection of distribution transformers, an online detection technology based on △U-I locus method is proposed. Based on the principle of field-circuit coupling, a circuit model of distribution transformer is built. The voltages of HV side and LV side of the transformer, as well as the current of the HV side, are simulated. Taking the difference between HV voltage and LV voltage as y axis and the HV current as x axis, a △U-I locus is drawn. To understand the influences of different types of transformer faults on the △U-I locus, different transformer faults, such as axial displacement fault and leakage fault, are simulated with the transformer circuit model. Simulation results show that the main parameters of the △U-I locus, like semi-major axis （a）, semi-minor axis （b）, eccentricity（e）, and surrounded area （S）, can be used for online fault detection of distribution transformers.

关 键 词：配电变压器 ΔU-I曲线 轴向位移 变压器故障 在线检测 

分 类 号：TM421[电气工程—电器]