李熊,王伟峰,葛玉磊,姚力,陆春光.基于特征电流的户变关系识别方法[J].电测与仪表,2021,58(9):115-121. Li Xiong,Wang Weifeng,Ge Yulei,Yao Li,Lu Chunguang.Research on user-transformer relation identification method based on characteristic current[J].Electrical Measurement & Instrumentation,2021,58(9):115-121.
基于特征电流的户变关系识别方法
Research on user-transformer relation identification method based on characteristic current
Since the inexact user-transformer relation in low-voltage area network influences the business development of line loss management, three-phase unbalanced management, breakdown rescue, etc. severely, and the current identification method cannot consider both the identification accuracy and power supply reliability, a user-transformer relation identification method based on characteristic current signal is proposed in this paper. In this method, the electricity meter, as the signal sender, is applied to generate the harmonic current with specific frequency and characteristic information by the load resistance switching, the sliding discrete Fourier transform (DFT) is adopted to extract and decode the signal in real time at the receiver of low voltage side of transformer, and then, the user-transformer relation is obtained through the comparison with target code bits, and the phase affiliation is determined by the comparison among three-phase current magnitude. The results of field pilot show that the proposed method in this paper can identify the user-transformer relation accurately, and the harmonic current produced lower than the limit value of national standard, which has good application effect and popularization value.
