Earth Mat Testing Procedure

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.

Earth mat testing procedure.

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

The substation earthing system comprises of a grid earth mat formed by a horizontal buried conductors. The measuring procedure described here uses the wenner method and uses the formula. 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. Read about design of substation earthing system here.

Earthing mat is mostly used in a placed where the large fault current is to be experienced. While designing an earth mat the following step is taken. Several tests are conducted to check the safety of products. The value is the resistance of that particular leg of the mgb.

Application guide for equipotential earth mat installation on substation structure mounted switches version. Thirdly measure the individual resistances of the ground system using the selective test of the earth ground tester see fig. Earth electrode conductive part which may be embedded in the soil or in a specific conductive medium e g. One among that is earth test.

This is unlike a small single electrode for example a lightning. Concrete or coke in electrical contact with the earth. Earth electrode resistance the resistance of an earth electrode to earth. This method is derived from the 4 point method which is used for soil resistivity measurements.

In a tt system where a connection to earth is not provided by the. Electrical safety testing is essential to ensure safe operating standards for any product that uses electricity. It reduced the overall grounding resistance. Earthing mat is made by joining the number of rods through copper conductors.

Mat ansi astm d178 or equal while operating the test set. An earth electrode and earth electrode resistance are defined in bs 7671 as. Measure the resistance of the mgn. Testing large earth systems.