变压器铁芯接地电流在线监测系统设计及其带电检测不确定度评定  

Design of on-line monitoring system for grounding current of transformer core and evaluation of uncertainty in live detection

作　　者：包玉树[1] 胡永建[1] 吕佳[1] 孙雄[1] 黄亚龙 Bao Yushu;Hu Yongjian;Lv Jia;Sun Xiong;Huang Yalong(Jiangsu Fangtian Electric Power Technology Co.,Ltd.,Nanjing 211102,China)

机构地区：[1]江苏方天电力技术有限公司,南京211102

出　　处：《电测与仪表》2023年第4期150-154,共5页Electrical Measurement & Instrumentation

基　　金：国网江苏省电力有限公司科技项目(J2017025);江苏方天电力技术有限公司科技项目(KJXM-0148)。

摘　　要：在保持变压器铁芯接地电流在线监测系统硬件设施不变的前提下,研究了一种该系统的算法升级策略。使用多测点多列交叉神经网络支持的机器学习对该系统的接地电流进行测量,同时研究一种基于6倍标准误差率的检测不确定度标识方法,研究该系统算法升级策略的同时,分析不确定度的标识方法。技术革新后的变压器铁芯接地电流监测误差小于±0.395%,可以满足对变压器铁芯接地电流的测量需求。且该算法可以排除实际测量中因为变压器内外部复合故障导致的接地电流产生机理差异性影响。同时,重点研究了对铁芯接地电流误差测量中的扩展不确定度测量方法确认问题,实验数据验证了6倍标准偏差率作为扩展不确定度测量标度,可以满足该系统的测量误差标定需求。On the premise of keeping the hardware facilities of transformer core grounding current online monitoring system unchanged,an algorithm upgrading strategy of the system is studied in this paper.The grounding current of the system is measured by using the machine learning system supported by multi-measuring points and multi-column cross neural network formed.Meanwhile,a method of uncertainty identification based on 6 times standard error rate is studied.The identification method of uncertainty is analyzed while studying the algorithm upgrade strategy of the system.After the technical innovation,the monitoring error of transformer core grounding current is less than system unchanged,an algorithm upgrading strategy of the system is studiedrmer core grounding current.Moreover,the algorithm can eliminate the difference of grounding current mechanism caused by internal and external composite faults of transformer.Meanwhile,this paper focuses on the confirmation of measurement method of expanded uncertainty in the measurement of iron core grounding current error.It is considered that 6 times standard deviation rate as the measurement scale of expanded uncertainty can meet the measurement error calibration requirements of the system.

关 键 词：铁芯接地电流 在线监测 算法升级 不确定度 标准偏差率 

分 类 号：TM307[电气工程—电机]