直流电流互感器暂态特性校验及灰色评价方法研究

Research on Verification and Grey Evaluation Method of DC Current Transformer Transient Characteristics

电流互感器的暂态特性及其评价方法是影响保护装置、关系到系统安全稳定的关键因素,但当下国内缺少对直流电流互感器暂态特性校验的相关研究。因此,为了实现直流电流互感器上升时间,最大过冲,暂态延时以及周期稳定性等暂态性能参数的校验及评价,提出了一种基于重采样技术的直流互感器校验系统。基于校验系统,得到互感器评价的指标依据,进一步提出基于灰色理论的直流互感器特性评价方法。最后通过暂态性能试验,得到了被测直流互感器的暂态特性参数,并建立了其评价模型,通过案例分析,给出不同互感器的量化评价得分值。所提出的方法在直流电流互感器现场校验中具有重要的借鉴价值。

The transient characteristics of current transformer and the corresponding evaluation method are the key factors affecting the protection device and system security and stability. However, there is a lack of relevant research on the transient characteristics verification of DC current transformer in China. Therefore, in order to verify and evaluate the transient performance parameters such as rise time, maximum overshoot, transient delay and periodic stability of DC current transformer, a DC transformer calibration system based on resampling technology is proposed. Based on the calibration system, the index basis of transformer evaluation is obtained, and the evaluation method of DC transformer characteristics based on grey theory is proposed. Finally, through transient performance test, the transient characteristic parameters of the tested DC transformer are obtained, and the evaluation model is established. Through case analysis, the quantitative evaluation scores of different transformers are given. The method proposed has important reference value in the field calibration of DC current transformer.