The successful operation of an entire power system depends on the efficient performance of substations. Substations operate as “the heart” of the overall power system. In any substation, a well-designed grounding plays an important role. Since absence of a safe grounding system can result in non-operation of control and protective devices. Above all, a grounding system has to be safe for the people working within the substation.

The main purpose of this work is to design safe and cost-effective grounding systems for HV/ EHV substations situated at such locations where soil is not uniform. Standard equations are used in the design of an earthing system such as touch and step voltage criteria for safety, earth resistance, grid resistance, maximum grid current, minimum conductor size and electrode size, maximum fault current level and resistivity of soil.

By selecting the proper horizontal conductor size, vertical electrode size and soil resistivity, the best choice of the project for safety can be performed. This paper mentions the calculation of the desired parameters for 400 kV substation.

Should you require assistance from our electrical engineer in designing a substation earthing system or contact our office or complete this form and then email info@lpinz.co.nz

Browse our Earthing & Exothermic Welding Products