基于能耗比的移变变压器励磁涌流的识别研究摘要随着经济和工业的快速发展,各行各业对电力的需求与日俱增,国家电网在电力系统上的投资也是逐年增加,电力系统的容量不断发展和扩大。变压器在电力系统占有重要的地位,承担着电能的传输和电压等级的变换,在发电和输配电中都发挥着重要的作用,是电力系统安全稳定运行的关键设备 ,在电力系统安全保护上,电力变压器的保护的要求更高。由于变压器的励磁涌流是变压器差动保护中的一个关键性研究难点,所以对变压器励磁涌流的识别对变压器保护、电力系统的运行稳定有着重要的意义。本文对变压器的结构做了详细介绍,对变压器励磁涌流产生的机理,从励磁涌流和故障电流的特征进行分析,根据常用的变压器励磁涌流识别方法的各自的优缺点特征,对励磁涌流和故障电流的不同做了分析,提出了基于能耗比的移变变压器励磁涌流的识别方法。通过对监测到的变压器的电压电流信号的变化,来识别励磁涌流。在 Matlab 中的 Simulink 环境中搭建了励磁涌流的仿真模型,设计了仿真实验,对空载闸、单相接地等条件下的验证,对获得的结果进行了分析,在电力系统各种运行状态和故障情况下,能够很好的识别出励磁涌流和故障电流,减少了变压器保护的错误判断引起的误动,提高了变压器保护的可靠性。关键词:电力系统,变压器,励磁涌流,能耗比IIdentification of Magnetizing Inrush Current of Transformer Transformer Based on Energy RatioAbstractWith the rapid development of economy and industry, the demand for electricity in all walks of life is increasing day by day. The investment of the national grid in the power system is also increasing year by year, and the capacity of the power system is continuously developing and expanding. The transformer occupies an important position in the power system. It undertakes the transmission of electric energy and the transformation of the voltage level. It plays an important role in power generation and transmission and distribution. It is the key equipment for the safe and stable operation of the power system. The requirements for protection of power transformers are highe...