Study of Analysis and Suppression on Grounding Circulation Current of 750 kV Transformer Π Grounding

doi:10.11985/2018.06.006

Abstract

Abstract:

To larger grounding circulation current (GCC) produced by 750kV transformer neutral Π type grounding, GCC mathematical model is fabricated, its GCC value and factors are analyzed. Real GCC is measured, its relation is built to load current, and so GCC suppression measure is put forward. Real resistance parameters is used to analyze the GCC change before and after modification, and it is found that GCC is eliminated and consistent with real measured result. The correct theoretical analysis and valid suppression measure are fully tested with related to the GCC of 750kV transformer neutralΠtype grounding.

Key words: 750kV transformer, neutral Π type grounding;, grounding circulation current (GCC), mathematical model, suppression

CLC Number:

TM835

Li Shan,Li Wei,Wu Biao,Zhang Yuan,Zhou Libing,Gong Duohu. Study of Analysis and Suppression on Grounding Circulation Current of 750 kV Transformer Π Grounding[J]. Journal of Electrical Engineering, 2018, 13(6): 36-41.

Figures/Tables 11

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名称	数值
负荷电流/A(I_A= I_B= I_C)	750	500	400	250	125
环流实测值I₁/A	125	85	65	42	20
环流/负荷电流(I₁/I)	0.167	0.170	0.163	0.168	0.160

名称	参数
等值电源/kV(峰值)	636.7∠0°
等值阻抗/Ω	3.04 + j33.696
主变压器额定容量/MV·A	1 500
主变压器阻抗电压(%)	U₁₂：18.97;U₁₃：45.11;U₂₃：22.09