Research on Time-Domain Transfer Impedance Measurement Technology for High Frequency Current Transformers in Partial Discharge Detection of Cables

doi:10.1007/s12204-020-2154-7

J Shanghai Jiaotong Univ Sci ›› 2020, Vol. 25 ›› Issue (1): 10-17.doi: 10.1007/s12204-020-2154-7

Research on Time-Domain Transfer Impedance Measurement Technology for High Frequency Current Transformers in Partial Discharge Detection of Cables

SONG Simeng¹(宋思蒙), CHEN Xiaoxin² (陈孝信), QIAN Yong ^1* (钱勇), WANG Hui¹(王辉), ZHANG Yue¹ (张悦), SHENG Gehao¹ (盛戈皞), JIANG Xiuchen¹ (江秀臣)

(1. Department of Electrical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China; 2. State Grid Zhejiang Electric Power Research Institute, Hangzhou 310014, China)

出版日期:2020-01-15 发布日期:2020-01-12
通讯作者: QIAN Yong (钱勇) E-mail: qian_yong@sjtu.edu.cn

Research on Time-Domain Transfer Impedance Measurement Technology for High Frequency Current Transformers in Partial Discharge Detection of Cables

SONG Simeng¹ (宋思蒙), CHEN Xiaoxin²(陈孝信), QIAN Yong ^1* (钱勇), WANG Hui¹ (王辉), ZHANG Yue¹ (张悦), SHENG Gehao¹ (盛戈皞), JIANG Xiuchen¹ (江秀臣)

(1. Department of Electrical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China; 2. State Grid Zhejiang Electric Power Research Institute, Hangzhou 310014, China)

Online:2020-01-15 Published:2020-01-12
Contact: QIAN Yong (钱勇) E-mail: qian_yong@sjtu.edu.cn

摘要/Abstract

摘要： We focus on the high frequency current method which is widely applied in the partial discharge (PD) detection of cables. Aiming at guaranteeing the accuracy of this method, we study an innovative time-domain technology for e?ectively measuring the transfer impedance of the high frequency current transformers (HFCTs). The proposed technology called pulse injection method obtains the system response under the excitation of the wide-band instantaneous pulse signal. Firstly, by studying the working principle of HFCTs, we summarize that the bandwidth of the selected signal acquisition device should be at least 100MHz to ensure measurement accuracy. Secondly, Gauss pulse and square wave pulse are generated to determine the effects of different sources. The measurement results indicate that Gauss pulse is more suitable for pulse injection method, and the rise time should be under 10 ns to improve the starting frequency of oscillation distortion. Finally, the transfer impedance curves of five types of HFCTs are acquired by both pulse injection and traditional point-frequency methods. The measurement results show a remarkable consistency between two methods. However, pulse injection method requires the simpler operation and has a higher resolution, obviously improving the measurement e±ciency and better displaying the details of the transfer impedance curves.

关键词: partial discharge (PD), high frequency current transformer (HFCT), transfer impedance, pulse measurement

Abstract: We focus on the high frequency current method which is widely applied in the partial discharge (PD) detection of cables. Aiming at guaranteeing the accuracy of this method, we study an innovative time-domain technology for e?ectively measuring the transfer impedance of the high frequency current transformers (HFCTs). The proposed technology called pulse injection method obtains the system response under the excitation of the wide-band instantaneous pulse signal. Firstly, by studying the working principle of HFCTs, we summarize that the bandwidth of the selected signal acquisition device should be at least 100MHz to ensure measurement accuracy. Secondly, Gauss pulse and square wave pulse are generated to determine the effects of different sources. The measurement results indicate that Gauss pulse is more suitable for pulse injection method, and the rise time should be under 10 ns to improve the starting frequency of oscillation distortion. Finally, the transfer impedance curves of five types of HFCTs are acquired by both pulse injection and traditional point-frequency methods. The measurement results show a remarkable consistency between two methods. However, pulse injection method requires the simpler operation and has a higher resolution, obviously improving the measurement e±ciency and better displaying the details of the transfer impedance curves.

Key words: partial discharge (PD), high frequency current transformer (HFCT), transfer impedance, pulse measurement

中图分类号:

TM 835.4

SONG Simeng (宋思蒙), CHEN Xiaoxin (陈孝信), QIAN Yong (钱勇), WANG Hui (王辉), ZHANG. Research on Time-Domain Transfer Impedance Measurement Technology for High Frequency Current Transformers in Partial Discharge Detection of Cables[J]. J Shanghai Jiaotong Univ Sci, 2020, 25(1): 10-17.

SONG Simeng (宋思蒙), CHEN Xiaoxin (陈孝信), QIAN Yong (钱勇), WANG Hui (王辉), ZHANG Yue (张悦), SHENG Gehao (盛戈皞), JIANG Xiuchen (江秀臣). Research on Time-Domain Transfer Impedance Measurement Technology for High Frequency Current Transformers in Partial Discharge Detection of Cables[J]. J Shanghai Jiaotong Univ Sci, 2020, 25(1): 10-17.

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Research on Time-Domain Transfer Impedance Measurement Technology for High Frequency Current Transformers in Partial Discharge Detection of Cables

Research on Time-Domain Transfer Impedance Measurement Technology for High Frequency Current Transformers in Partial Discharge Detection of Cables

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