A Novel Power Transformer Condition Monitoring System Based on Wide-Band Measurement of Core Earth Signals and Correlation Analysis With Multi-Source Data

IEEE Access

Xiang Dong¹  Lisheng Pang²  Xuezhi Ke³  Zhaohui Li⁴ 

[1] China State Grid, Beijing Maintenance Company, Beijing, China;Datang Guanyinyan Hydroelectric Development Company, Panzhihua, China;School of Hydropower and Information Engineering, Huazhong University of Science and Technology, Wuhan, China;State Key Laboratory of Advanced Electromagnetic Engineering and Technology, Huazhong University of Science and Technology, Wuhan, China;

关键词: Correlation analysis;    core earth signal (CES);    condition monitoring;    industry applications;    power transformer;    wide-band measurement;   

DOI  :  10.1109/ACCESS.2019.2951577

来源: DOAJ

【 摘 要 】

On-line condition monitoring and real-time fault detection are essential to protect power transformers from unscheduled outage of services. The core earth signals (CES) are valuable for fault detection and diagnosis of power transformers, as they are related to multiple transformer defects and faults, such as core multi-point earthing fault and core deep saturation. Moreover, the CES also contain valuable information of transient impulses intruded into power transformers such as very fast transient overvoltage (VFTO) impulses. This paper develops a novel power transformer condition monitoring system (NCMS), which makes full use of CES to detect and diagnose the external impulses and internal defects and faults. Firstly, the NCMS carries out the wide-band measurement of CES. Secondly, the NCMS obtains data from supervisory control and data acquisition system (SCADAS), dissolved gases analysis (DGA) system, and other monitoring systems, and correlates these data using grey relational analysis (GRA). Finally, the NCMS detects the impulses and diagnoses defects and faults based on the correlation relationships, then presents the monitoring results to the users. This novel system has been applied to the field and successfully diagnosed many defects and faults. It has high accuracy (<; 3%) at the power and harmonic frequencies and possesses the capability to capture VFTO-pulses.

【 授权许可】

Unknown