大型电力变压器损耗带电测试技术研究  

The On-Site Method for the Loss Characteristic in Power Transformer

作　　者：张荣伦 王帅[2] 穆海宝[2] 张冠军[2] 黄松 Zhang Ronglun;Wang Shuai;Mu Haibao;Zhang Guanjun;Huang Song(Electric Power Research Institute of Hainan Power Grid Co.Ltd,Haikou 570100,China;State Key Laboratory of Electrical Insulation and Power Equipment Xi’an Jiaotong University,Xi’an 710049,China)

机构地区：[1]海南电网有限责任公司电力科学研究院,海口570100 [2]西安交通大学电力设备电气绝缘国家重点实验室,西安710049

出　　处：《电工技术学报》2019年第4期683-692,共10页Transactions of China Electrotechnical Society

摘　　要：电力变压器的损耗特性可以反映其运行状态,关系到电力系统的安全稳定。传统变压器损耗测试需进行离线试验,影响供电连续性且不能反映真实情况。本文提出电网系统供电的变压器空载及负载损耗带电测试新方法,并采用加窗插值算法处理数据以减小频谱泄漏和栅栏效应的影响。基于测量方法,开发变压器损耗带电测试系统,包括空载损耗测量和负载损耗测量两部分,以解决空载电流测量精度、电压电流采集同步性及复杂现场的干扰等问题。对现场变压器损耗进行测试,取得了较好结果,验证了系统带电测试变压器损耗的可行性。The loss characteristic of power transformer can reflect its working condition,which is related to the safety and stabilization of the power system.However,the traditional transformer loss test needs to be tested offline,which will affect the continuity of power supply and fail to reflect the real status of transformer.In this paper,a new on-site method for the loss characteristic of power transformer is designed.Besides,considering the spectrum leakage and grid effect in the signal processing,interpolation algorithm with Blackman-Harris window is applied.Consequently,an on-site measuring system for the load and no-load losses of the transformer is designed,which solves the problems of no-load current measurement accuracy,the signal synchronism and signal interference.The no-load and load tests are carried out on the transformers at a substation with the on-site measuring system.It is proved that the on-site measuring system is feasible.

关 键 词：电力变压器 损耗特性 带电测试 加窗插值算法 

分 类 号：TM411.2[电气工程—电器]