Substation Earth Mat Testing

The purpose of this standard work practice swp is to standardise and prescribe the method for earth injection testing of a substation earthing system for the purpose of determining current distribution earth potential rise epr and personnel safety.

Substation earth mat testing.

Equipment frame work and other non current carrying parts of the electrical equipments in the sub station. A current electrode is required approximately 1 km from the site. Ideally the distance to the current electrode should be ten times the maximum dimension of the earth system. The neutral point of such system through its own independent earth.

Mat ansi astm d178 or equal while operating the test set. Ner earth or obvious earth bar in switch room. All extraneous metallic frame work not associated with equipment. Earth mat in 110kv side of a 220 110 kv substation the fence equipment body tanks support structures towers structural steelworks water pipes etc.

Fence if it is within 2 m from earth mat. Earth mat earth mat design earth grid what is earth mat substation earth mat design why we use earth mat in substation earth mat design क ल ए etap. 1 identify a suitable reference earth connection in the substations e g. For a single 2 m long electrode this is not usually a problem with a remote test spike at 20 m.

In high and medium voltage air insulated substations ais the electromagnetic field which causes are the static charges of bare cable and conductors and by the atmospheric conditions surges induce voltages at no live parts of the installation that create potential differences between metallic parts and ground and also between different points of. Introduction to substation earthing grid. The proof test of insulating matting are dielectrical resistance tests provided by the mat manufacturer on the total running metre of the product and are used to safeguard a standard conformity of resistance throughout the entire section roll or surface area of the electrical mat the proof test must be applied to the insulating mats for a. Testing procedure before installation of gratings lv rubber gloves must be worn at all times when test leads are connected to the substation earths.

Bureau of standards now nist developed. Frank wenner of the u s. Earth mat is connected to the following in a substation.