Earth Mat Design Pdf

The grounding system in substation is very important.

Earth mat design pdf. Connecting to the earth is easy and can be done outdoors by walking barefoot on the earth s natural surfaces or indoors with one of our earthing products. Earthing systems fundamentals of calculation and design figure 2 earth resistivity ρ of clay as function of soil humidity h type of ground ground resistivity ρ ωm range of values average value boggy ground 2 50 30 adobe clay 2 200 40 silt and sand clay ground humus 20 260 100 sand and sandy ground 50 3 000 200 moist peat. The wenner and schlumberger test methods are both recommended with testing and interpretation. Important formulas for designing a substation grid earthing system.

The cross section of the buried cable should calculated in accordance with the value of the phase to earth short circuit current but it is common to use the three phase short circuit current for this purpose. Read about design of substation earthing system here. The earth mats are usually constructed of copper tape in lattice design or using bare copper conductor and connected to the switch handle or control unit depending on the anticipated fault current. While designing an earth mat the following step is taken.

It covers some of the practical aspects of earthing in detail. Such type of system helps in limiting the ground potential. Earthing mat is made by joining the number of rods through copper conductors. Chemical electrolytic ground electrodes provide a low grounding resistance in areas of high soil resistivity and low.

It reduced the overall grounding resistance. Can t do the earth mat design separately for each step and finally connect each steps together. This paper briefly discusses about the earth mat design and procedure for the same. In this design these additional rods or mats are made to bond with the existing main ground mat and thereby assist in achieving the desired results.

Earthing is a fast growing movement based upon the discovery that connecting to the earth s natural energy is essential for vibrant health. Could u please explain me how to do the earth mat design for 220 132 33 kv outdoor gss which have 5 steps 135m 138m 141m 144m 147m. Earthing mat is mostly used in a placed where the large fault current is to be experienced. The substation earthing system comprises of a grid earth mat formed by a horizontal buried conductors.

In pole mounted equipment earthing designs the following items should be effectively bonded or earthed. As earthing systems are installed near the surface of the earth the top soil layers being subject to higher current densities are the most significant and require the most accurate modelling. Difference between grounding earthing and bonding.