Effect Evaluation of Resistance-reducing Transformation for Ground Grid of Urban Substation
Megn Qing-bo · Guangdong Electric Power · 2010
To solve the common difficulty in precisely evaluating the state of ground network caused by the difficulty in accurately measuring the ground resistance of urban substation ground grid in recent years,the resistance-reducing transformation for ground grid of 110 kV Fuhao Substation under Zhongshan Power Supply Bureau of Guangdong Power Grid Corporation is taken for example,the shunt coefficient of 10 kV cable sheath to measuring current is centered around,and the evaluation means of indirectly reflecting the ground-grid resistance-reducing effect via the changes in shunt coefficient of 10 kV cable sheath before and after the resistance-reducing transformation is discussed.A referential method for measuring and evaluating the ground network state of urban substation is proposed to solve the limitation in urban ground grid assessment due to merely adopting ground resistance measuring means.