IEEE 80 and IS 3043 give details for calculating the earth resistance and how the designing of the earthing system for a substation should be performed. The earthing material used in substations is very critical as the fault clearance time is expected to be at a minimum always, for this the earthing resistance offered by the material should be the lowest. In substations, all equipment, their metallic parts and all other metallic objects like fences etc are connected to the earthing grid, this grid has horizontal and vertical electrodes which are connected using cross clamps or are exothermically welded. IS 3043 provides the soil resistivity values and the soil corrosion level that affects the electrodes used for earthing. Soil type, resistivity, moisture content etcįrom all the points listed above, soil resistivity is a crucial factor in deciding the earthing system design and requirements.The main factors that need prime consideration while selecting an earthing electrode are: Let us identify the various factors, considered for an efficient earthing system and the right earthing material.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |