基于同相测量一致性的电压互感器误差状态在线评估方法

On-line error evaluation method of instrument voltage transformers based on MCSP

针对一次电压波动下高维随机矩阵评估方法无法可靠评估电压互感器误差状态的问题,提出一种基于同相测量一致性的电压互感器误差状态评估方法。该方法结合核主成分分析及其重构算法,构造灵敏度更高的评价指标,并计及一次电压波动下多台电压互感器评价指标变化的相似性,构造基于测量同相的多台电压互感器差异性评估指标,削弱一次电压波动对状态评估准确度的影响,并根据差异性评价指标的正负此判断误差极性。仿真实验及现场应用结果表明:改进后的高维随机矩阵评估方法能够可靠地评估电压互感器0.2%的误差异常状态。

The existing evaluation methods based on large-dimensional random matrices cannot reliably evaluate transformers due to the influence of primary voltage fluctuations,this paper proposes a method for evaluating the error condition of voltage transformers based on measurement consistency of same phase.The paper use kernel principal component analysis(KPCA)and reconstruction algorithm to establish evaluating indicators with higher sensitivity.Considering the similarity of the evaluating indicators of same phase,a difference evaluating indicator of voltage transformers based on measuring same phase is established to diminish the influence of stationary fluctuations and judge the polarity of errors by judging whether the difference evaluating indicators are positive or negative.The simulation experiments and field application results suggest that 0.2%error of voltage transformers can be estimated using the improved evaluation method based on large-dimensional random matrices.