摘要
为良好测量故障稳态、暂态电流,在分析积分器特性的基础上,设计了一种Rogowski线圈用新型积分电路。该电路利用电压串联型负反馈放大电路正向输入阻抗大的优点,结合减法器原理,通过分别对信号、地积分后2级相减的方式,达到理想的积分、消除零漂效果。利用在Simulink环境下搭建电路模型的方法进行仿真,在加入运放失调电压等干扰信号的条件下,对比了Rogowski线圈用电压并联型负反馈积分器和新型积分电路对电流故障暂态信号的跟踪效果。仿真结果表明,新型积分器能够真实地反映故障稳态、暂态电流,有效地抑制了积分器零漂对传感元件的干扰。
In order to truly measure the steady coil is designed based on the integrator analysis and transient currents,an integral circuit for Rogowski ,which takes the advantage of serial voltage negative -feedback amplifier with large input impedance to integrate the signal and ground inputs respectively and combines with the principle of subtracter to carry out dual-stage subtraction for implementing the ideal integration without zero drift. Simulation is carried out under Simulink environment for operational ampli- fier voltage offset,noise interference ,etc. Comparison of the transient current tracking effect between the Rogowski coil with integrator of parallel voltage negative-feedback amplifier and that of proposed serial one＂ show that,the latter truly reflects the steady and transient currents and effectively suppresses the interference of integrator zero drift with the sensor.
出处
《电力自动化设备》
EI
CSCD
北大核心
2010年第5期115-117,共3页
Electric Power Automation Equipment
