Earth Mat Testing Procedure

The measuring procedure described here uses the wenner method and uses the formula.

Earth mat testing procedure.

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. This is unlike a small single electrode for example a lightning. Various governments and agencies have developed stringent requirements for electrical products that are sold world wide. The substation earthing system comprises of a grid earth mat formed by a horizontal buried conductors.

Earth electrode conductive part which may be embedded in the soil or in a specific conductive medium e g. Application guide for equipotential earth mat installation on substation structure mounted switches version. In a tt system where a connection to earth is not provided by the. Thirdly measure the individual resistances of the ground system using the selective test of the earth ground tester see fig.

Bureau of standards now nist developed. The grounding system in substation is very important. Measure the resistance of the mgn. Suitable test techniques must be used for large systems to ensure valid readings are obtained.

Testing large earth systems. Frank wenner of the u s. While designing an earth mat the following step is taken. Concrete or coke in electrical contact with the earth.

Earthing mat is mostly used in a placed where the large fault current is to be experienced. 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. An earth electrode and earth electrode resistance are defined in bs 7671 as. Read about design of substation earthing system here.

Such type of system helps in limiting the ground potential. Earth electrode resistance the resistance of an earth electrode to earth. It reduced the overall grounding resistance. Mat ansi astm d178 or equal while operating the test set.

One among that is earth test. This method is derived from the 4 point method which is used for soil resistivity measurements. 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. Several tests are conducted to check the safety of products.