Unequally Spaced Grounding Grid Designed from Equally Spaced Grounding Grid for 220/132 kV Substation

摘要

In unequally spaced grounding grid the buried horizontal interconnected conductors are placed at unequal space in such a manner that denser and closely spaced grid conductors placed near periphery of the grid than center of the earth grid. So grounding grid design in unequally spaced manner may be more safe than equally spaced in which there are greater space between horizontal conductors at the center of grid and distance between adjacent horizontal conductors are gradually decreased from center to the periphery of grid. This paper describes the method to design safe and economic unequally spaced grounding grid from equally spaced grounding grid for 220/132 kV substation without using ground rods in uniform soil to overcome the drawback of equally spaced grounding grid. By designing grounding grid in unequally spaced manner may save grounding grid materials also.