Analysis of limiting effect of 500 kV autotransformer neutral grounding by small reactance on ground short-circuit current

作者：Liang Ji Feng^*; Liu Wen Ying; Liang Cai; Li Xiao Rong; Shen Wei Dong; Li Qun Ju

来源：Power System Protection and Control, 2011, 39(13): 96-99+110.

• Autotransformer
• Breaking-current
• Equivalent impedance
• Limiting
• Neutral grounding

Aiming at the issue that part of 220 kV bus single-phase short-circuit current exceeds the three-phase short-current, the network structure, network characteristics and the structural characteristics of transformer in North China Power Grid, and why 220 kV single-phase short-circuit current increases sharply are analyzed. According to the high load data of North China Power Grid in winter of 2009, this paper selects the Anding Station, Shunyi Station, Binhai Station and Baobei Station in the North China Power Grid, and uses the Power System Analysis Software Package (PSASP) to make short-circuit current calculation of main transformer neutral grounding via low resistance. According to short-circuit current calculation, it analyzes the limiting effects of 500 kV autotransformer neutral grounding by small reactance on 220 kV single-phase short-circuit current, the effects of grid structure on limiting the low reactance current, and gives a project guidance about small reactor's selection.

• 出版日期2011
• 单位华北电力大学