宽脉冲电流测量线圈

Rogowski coils measuring wide pulse current

由Rogowski线圈的集中参数模型得到测量系统的传递函数,在正弦稳态输入下得到微分型Rogowski线圈的最佳采样电阻阻值,同时对普通RC积分和有源积分进行了幅频特性分析,根据测量精度的要求得出测量系统的实际带宽。有源积分较普通RC积分拓宽了频带,提高了暂态性能。合理设计了有源积分器的结构和参数,有效抑制了积分漂移,保证了测试精度和可靠性。在神光Ⅲ能源模块中对宽脉冲电流测量装置进行了实验验证,结果表明该脉冲电流测量装置的电路结构和参数配置是合理的。

The transfer function of the measurement system is established on the lumped parameter model of Rogowski coil,and the optimal damping resistor of the differential type of Rogowski coil is obtained under the steady sine input.In this paper,the amplitude-frequency characteristics of RC integrator circuit and active integrator circuit are compared,and also the actual bandwidths of the two measurement systems are determined by the measurement precision.Using active integrator circuit,the measuring bandwidth is extended and the transient performance is improved.Theoretical analysis indicates that the optimal structure and parameters can inhibit the integrator drift.Therefore,the measuring system has the features of high accuracy and reliability.The experimental results in SG-Ⅲ have proved that the proposed measuring system is exact and credible.