On-line Error Evaluation Method of Instrument Voltage Transformers Considering Primary Voltage Fluctuations

被引：0
|
作者：
Zhao P. [1 ]
Ma K. [2 ,3 ]
Li H. [2 ]
Zhou F. [1 ]
Chen Q. [2 ]
机构：
[1] China Electric Power Research Institute, Wuhan
[2] School of Electrical and Electronic Engineering, Huazhong University of Science and Technology, Wuhan
[3] Jiaxing Power Supply Company, State Grid Zhejiang Electric Power Co., Ltd., Jiaxing
来源：
Gaodianya Jishu/High Voltage Engineering | 2022年 / 48卷 / 03期
基金：
中国国家自然科学基金;
关键词：
Adaptive differential interval; Error; Instrument voltage transformers; Large-dimensional random matrices; Measurement consistency of same-phase; Primary voltage fluctuations;
D O I：
10.13336/j.1003-6520.hve.20211779
中图分类号：
学科分类号：
摘要：
Measurement accuracy of instrument voltage transformers directly affects the safety, stability and economic operation of the power grid. In fact, the existing evaluation methods based on large-dimensional random matrix 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 differential processing using adaptive differential interval (DP-ADI) and measurement consistency of same phase (MCSP). According to the time series theory, the primary fluctuation is divided into non-stationary fluctuations caused by definite factors and stable small stationary fluctuations caused by random factors. Moreover, a stabilized method based on adaptive differential interval is put forward to weaken the influence of non-stationary fluctuations. In addition, a difference evaluating indicator based on the measurement consistency of same phase is established to diminish the influence of stationary fluctuations. The simulation experiments and field application results suggest that 0.1% error of voltage transformers can be estimated by using the improved evaluation method based on large-dimensional random matrices. © 2022, High Voltage Engineering Editorial Department of CEPRI. All right reserved.
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页码：1042 / 1051
页数：9
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