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Analysis of Conducted Disturbance via Current Transformer Due to switch operation of GIS Disconnector in UHV Substation

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CSEE Journal of Power and Energy Systems 2023年第3期9卷 1227-1234页

作者： Jun Zhao Weijiang Chen Kejie Li Zihan Teng Ni Li Tao Wen Xing Fan State Key Laboratory of Power Grid Environmental Protection China Electric Power Research InstituteWuhan&BeijingChina State Grid Corporation of China BeijingChina School of Electrical Engineering and Automation Hefei University of TechnologyHefeiChina School of Electrical Engineering Xi’an Jiaotong UniversityXi’anChina

The characteristics of conducted disturbances via current transformer(CT)caused by switch operations in 1000 kV UHV substations are studied in this *** the broadband circuit models might have limitations on the stability and accuracy for CT conducted disturbance simulation,a frequencydomain simulation method without circuit synthesis is proposed based on VFTC spectrum and CT transfer *** improve VFTC simulation accuracy,both the bushing radiation loss and frequency-dependent earth impedance are taken into *** characteristics of three types of windings for the 1000 kV GIS CT are ingeniously measured from a combination of fast and slow impulse *** conducted disturbances simulations in UHV Wuhu substation,bushing radiation loss is found to have a suppression effect on the highfrequency response but the effect of frequency-dependent earth impedance can be *** a result,the maximum amplitude of 84.5 A for the conducted disturbance is obtained,thus a fast damped oscillatory wave immunity test with no lower than Level 4 from IEC standard is suggested to test the anti-interference performance of the secondary equipment in UHV substation.

关键词： Conducted disturbance current transformer switch operation simulation UHV substation

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Surgical Treatment of Complete Transposition of the Great Arteries in Newborn

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Chinese Medical Journal 2016年第19期129卷 2381-2383页

作者： Qing-Yu Wu Dong-Hai Li Hui Xue Zhong-Hua Xu Hong-Yin Li Ming-Kui Zhang First Hospital of Tsinghua University Medical Center Tsinghua University Beijing 100016 China

INTRODUCTION Complete transposition of the great arteries （TGAs）is a common cyanotic congenital heart defect,with an incidence rate of 0.02%,accounting for 5-7% of congenital heart diseases.[1] After birth,infants with TGA largely rely on ventricular septal defect （VSD）,atrial septal defect （ASD）,and patent ductus arteriosus （PDA）to sustain *** systemic-pulmonary shunt and surgical correction,these infants will probably die on the day after birth.

关键词： Newborn switch operation Transposition of the Great Arteries

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