Earth Mat Testing Procedure

Various governments and agencies have developed stringent requirements for electrical products that are sold world wide.

Earth mat testing procedure.

Thirdly measure the individual resistances of the ground system using the selective test of the earth ground tester see fig. The measuring procedure described here uses the wenner method and uses the formula. Application guide for equipotential earth mat installation on substation structure mounted switches version. The 3 point method called the fall of potential method comprises the earth electrode to be measured and two other electrically independent test electrodes usually labelled p potential and c current these test electrodes can be of lesser quality higher earth resistance but must.

Frank wenner of the u s. Read about design of substation earthing system here. In a tt system where a connection to earth is not provided by the. The grounding system in substation is very important.

Mat ansi astm d178 or equal while operating the test set. An earth electrode and earth electrode resistance are defined in bs 7671 as. The value is the resistance of that particular leg of the mgb. 2 oct 2005 5 of 11 testing procedure before installation of gratings lv rubber gloves must be worn at all times when test leads are connected to the substation earths.

Several tests are conducted to check the safety of products. Measure the resistance of the mgn. Bureau of standards now nist developed. While designing an earth mat the following step is taken.

Such type of system helps in limiting the ground potential. Earthing mat is made by joining the number of rods through copper conductors. This is unlike a small single electrode for example a lightning. Earth electrode conductive part which may be embedded in the soil or in a specific conductive medium e g.

In order to obtain a low enough value of earth resistance earth systems may consist of an earth mat covering a large area or many interconnected rods. Suitable test techniques must be used for large systems to ensure valid readings are obtained. The substation earthing system comprises of a grid earth mat formed by a horizontal buried conductors. Testing large earth systems.

One among that is earth test. Concrete or coke in electrical contact with the earth. It reduced the overall grounding resistance. Earthing mat is mostly used in a placed where the large fault current is to be experienced.