Earth Mat Testing Procedure

Measure the resistance of the mgn.

Earth mat testing procedure. 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. Earth electrode resistance the resistance of an earth electrode to earth. Frank wenner of the u s. Application guide for equipotential earth mat installation on substation structure mounted switches version.

This method is derived from the 4 point method which is used for soil resistivity measurements. Earth electrode conductive part which may be embedded in the soil or in a specific conductive medium e g. Earthing mat is made by joining the number of rods through copper conductors. One among that is earth test.

This is unlike a small single electrode for example a lightning. 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. In a tt system where a connection to earth is not provided by the. Concrete or coke in electrical contact with the earth.

The substation earthing system comprises of a grid earth mat formed by a horizontal buried conductors. The value is the resistance of that particular leg of the mgb. Suitable test techniques must be used for large systems to ensure valid readings are obtained. The grounding system in substation is very important.

It reduced the overall grounding resistance. 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. Testing large earth systems. Bureau of standards now nist developed.

While designing an earth mat the following step is taken. The measuring procedure described here uses the wenner method and uses the formula. Thirdly measure the individual resistances of the ground system using the selective test of the earth ground tester see fig. An earth electrode and earth electrode resistance are defined in bs 7671 as.

Electrical safety testing is essential to ensure safe operating standards for any product that uses electricity. Several tests are conducted to check the safety of products. Read about design of substation earthing system here. Such type of system helps in limiting the ground potential.