摘要
电力变压器发生直流偏磁会引起变压器异常运行甚至损坏,而现有的方法不能准确检测其偏磁状态。提出一种新结构的磁通门传感器,该传感器从变压器铁芯磁通中提取部分分量,采用脉冲幅值法量化传感器的检测线圈输出信号从而表征变压器偏磁程度。作为验证,本文设计样机并采用10 k VA电力变压器进行实验。实验结果表明,当外加偏置电流从0 A到0.5 A变化时,磁调制输出信号幅值呈单调变化。
Direct current(DC)in power transformer caninitiate its abnormal operation,and even damage the transformer.However,the existed methods cannot accurately detect the bias magnetic state of the transformer.A new structure fluxgate sensor is proposed in this paper.The sensor extracts fractional flux from the transformer and uses the self-oscillating fluxgate principle to generate excitation current.In addition,the output signal of the sensor’s detection coil is quantified,using the pulse amplitude method,to characterize the degree of transformer bias.As a verification,a prototype is designed to experiment on a10kVA power transformer.The measurement results show that the magnetic modulation output signal changes monotonously as the applied bias current varies from0A to0.5A.
作者
赵娟
程帅
曹建安
ZHAO Juan;CEHNG Shuai;CAO Jianan(School of Electrical Engineering,Xi’an Jiaotong University,Xi’an 710049,China)
出处
《传感技术学报》
CAS
CSCD
北大核心
2018年第12期1787-1790,共4页
Chinese Journal of Sensors and Actuators
关键词
直流偏磁
磁通门原理
脉冲幅值法
direct current bias
fluxgate principle
pulse amplitude method
