The Assessment And Analysis Of Transformer Substation Grounding Grid

Transformer substation grounding grid is to guarantee the safe and reliable operation ofthe power system, ensure the safety of personnel one of the important measures. The purposeof the grounding main is to prevent personal electric shock casualties, ensure the normaloperation of power system, protection of transmission lines and variable distributionequipment and electric equipment insulation from damage; The fire prevention, to preventlightning damage equipment and prevent electrostatic discharge hazards, etc. Grounding gridin the transformer substation electrical equipment to provide public reference, system earthingfault when the quick release fault current, improve the substation ground potential distribution.Along with the rapid development of electric power industry, electric power system butt tofacilities is more and more strict, the requirements of substation grounding system is directlyrelated to the normal operation of the transformer substation, more involving personal andequipment safety, is to protect the safety of the electricity system reliability, security staff ofthe importance of safety facilities. Therefore, improve transformer substation grounding gridtechnology is of great significance.Transformer substation grounding grid condition assessment analysis work is mainlybased on the field test and CDEGS software such as theoretical calculation and analysis, andgives the grounding grid into the ground fault current and contact voltage, groundingresistance, earth screen potential distribution, the step voltage, counterpoise integrity andother current state, and the substation grounding system state evaluation analysis. Combinedwith the engineering practice, through the earth mat excavation inspection and groundingconductor corrosive diagnosis, soil resistivity and soil structure analysis, analysis of dragreduction agent, deep well and reduce the earth mat impedance technology, puts forward toimprove the state of the grounding grid.This paper through the earth mat state evaluation analysis, through the earth technologyconstruction, improve substationgrounding grip, make the earth mat in qualified state. Firstly,improve the substation ground potential distribution.Secondly, substation grounding gripcondition assessment analysis, Then guarantee the safe and stable operation of power systemis of great significance.