NDLI: A new algorithm to identify magnetizing inrush of converter transformers in HVDC transmission project

Content Provider	IEEE Xplore Digital Library
Author	Da-qiang Bi Cun-liang Feng Zhen-hua Zhang Bao-ming Ge Xin He
Copyright Year	2011
Description	Author affiliation: Dept. of Electric Engineering, Northeast Dianli University, China (Xin He) \|\| Xuji Hitachi Electrical Appliances Corporation Limited, China (Zhen-hua Zhang) \|\| School of Electrical Engineering, Beijing Jiaotong University, China (Cun-liang Feng; Bao-ming Ge) \|\| State Key Lab of Power System, Dept. of Electrical Engineering, Tsinghua University, China (Da-qiang Bi)
Abstract	This paper proposes an algorithm to detect the magnetizing inrush of two double-winding converter transformers in bipolar high voltage direct current (HVDC) transmission project by analyzing the waveform characteristics of the resultant current in the grid side. Delivery test of transformer may remain the different polarity of remanent flux in each converter transformer, which causes the inrush directions different when the two double-winding converter transformers are energized at the first time. So that the resultant current at the grid side is close to sinusoid and this leads to the mal-operation of differential protection. In this paper, the generalized nonsaturation zone of inrush current is proposed and the virtual current in the generalized nonsaturation zone is calculated by subtracting the DC offset in the inrush. A normal sinusoidal waveform is structured according to the virtual current, and the waveform coefficient between the structured current and actual current is calculated. The waveform coefficients are used to distinguish magnetizing inrush from fault current. The extreme cases simulated by RTDS (Real Time Digital Simulator) and the field data in China are analyzed and tested. The test results indicate that the proposed algorithm successfully detects magnetizing inrush during the transformers energized at the first time and other times. It is ensured that the differential protection is reliably blocked during inrush and quickly enabled during the short-circuit fault and even a small turn-to-turn fault.
Starting Page	1
Ending Page	6
File Size	365556
Page Count	6
File Format	PDF
ISBN	9781457710445
e-ISBN	9781457710438
DOI	10.1109/ICEMS.2011.6073993
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2011-08-20
Publisher Place	China
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Surges Surge protection Fault currents Circuit faults Magnetic flux HVDC transmission Harmonic analysis
Content Type	Text
Resource Type	Article

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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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