基于变压器电流直流分量衰减特性的励磁涌流识别方法

发布时间：2018-08-22 08:12

【摘要】：为有效区分励磁涌流与短路电流,确保变压器保护的可靠性,针对变压器励磁涌流与短路电流直流分量衰减特性的差异,提出了一种新的励磁涌流识别方法。该方法以变压器高压侧和中压侧出口断路器电流作为识别励磁涌流与短路电流的信号源,将电流直流分量与基波分量幅值比的衰减速率设置为判据,可以辨识出励磁涌流与短路电流。基于典型建模仿真分析了励磁涌流与短路电流直流分量衰减特性的差异,以及不同系统短路容量、变压器额定容量、铁心剩磁等因素的影响。经典型仿真结果及工程现场实测数据验证,该方法有效,适用于断路器未加装合闸电阻的情况,并具有原理清晰、所需测量数据少、简单易实现等优点,为新型继电保护装置开发及工程应用提供了参考。
[Abstract]:In order to effectively distinguish inrush current from short-circuit current, and to ensure the reliability of transformer protection, a new method of inrush current identification is proposed in view of the difference of DC component attenuation characteristics between inrush current and short-circuit current. In this method, the outlet current of transformer high voltage side and middle voltage side is used as signal source to identify inrush current and short circuit current, and the attenuation rate of DC component to fundamental component amplitude ratio is set as criterion. The inrush current and short circuit current can be identified. Based on the typical modeling and simulation, the difference of DC component attenuation characteristics between inrush current and short-circuit current is analyzed, as well as the influence of different system short-circuit capacity, rated capacity of transformer, core remanence and so on. The results of classical simulation and field measurement show that this method is effective and suitable for circuit breakers without closing resistor. The method has the advantages of clear principle, less measurement data and simple and easy realization. It provides a reference for the development and engineering application of a new type of relay protection device.
【作者单位】：电网安全与节能国家重点实验室(中国电力科学研究院);重庆大学电气工程学院;华北电力大学电气与电子工程学院;
【基金】：国家电网公司科技项目(SGNX0000DKJS1500066)~~
【分类号】：TM77

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