基于功率因数角的接地变压器匝间短路故障辨识  

Identification of inter turn short circuit fault of grounding transformer based on power factor angle

作　　者：李继攀 刘宏领 郭奇军 李明 杜玉宇 陈磊 LI Jipan;LIU Hongling;GUO Qijun;LI Ming;DU Yuyu;CHEN Lei(Heze Power Supply Company,State Grid Shandong Electric Power Company,Heze 274000,China;School of Electrical and Electronic Engineering of Shandong University of Technology,Zibo 255000,China)

机构地区：[1]国网山东省电力公司菏泽供电公司,山东菏泽274000 [2]山东理工大学电气与电子工程学院,山东淄博255000

出　　处：《供用电》2023年第9期50-57,共8页Distribution & Utilization

基　　金：国网山东省电力公司科技项目“接地变压器运行状态在线检测关键技术研究与应用”(520614220004)。

摘　　要：接地变压器可为中压不接地系统提供经消弧线圈接地或经接地电阻接地的中性点,其运行状态直接影响电网的安全与稳定。绕组匝间短路是接地变压器常见的故障类型,它会造成设备烧毁,引发停电事故。由于接地变压器的特殊结构,现有变压器故障诊断方法无法有效辨识接地变压器绕组匝间短路故障。针对此问题,提出了基于功率因数角的接地变压器匝间短路故障在线辨识方法。首先,建立了接地变压器等效电路;然后,分析了接地变压器不同相绕组发生匝间短路故障时功率因数角的变化规律,依据这一规律可实现接地变压器匝间短路故障及其相别的在线辨识;最后,在ANSYS软件中进行实例仿真,验证了所提方法的有效性。Grounding transformer can provide a neutral point grounded by an arc suppression coil or a grounding resistance for a medium voltage ungrounded system,which plays a very important role in the safe and stable operation of the power grid.Winding inter turn short circuit is a common fault type of transformers,which may cause equipment to burn and cause power outages.Due to the special structure of the grounding transformer,the existing transformer fault diagnosis methods can not effectively identify the winding inter turn short circuit fault of the grounding transformer.To solve this problem,an on-line identification method based on power factor angle for inter turn short circuit fault of grounding transformer was proposed.In this paper,the equivalent circuit of grounding transformer was first established,and then the law of power factor angle change when the inter turn short circuit fault occurs in different phase windings of grounding transformer was analyzed.According to this law,the on-line identification of the inter turn short circuit fault and its phase of grounding transformer can be realized.Finally,an example simulation test in ANSYS software verified the effectiveness of the proposed method.

关 键 词：接地变压器 绕组匝间短路 功率因数角 在线辨识 仿真试验 

分 类 号：TM933[电气工程—电力电子与电力传动]