Substation Earth Mat Testing

Introduction to substation earthing grid.

Substation earth mat testing.

Frank wenner of the u s. However this may be impractical for a substation with a 100 m square earth mat. For a single 2 m long electrode this is not usually a problem with a remote test spike at 20 m. Earth mat in 110kv side of a 220 110 kv substation the fence equipment body tanks support structures towers structural steelworks water pipes etc.

1 identify a suitable reference earth connection in the substations e g. Mat ansi astm d178 or equal while operating the test set. 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. Ner earth or obvious earth bar in switch room.

A current electrode is required approximately 1 km from the site. The neutral point of such system through its own independent earth. Ideally the distance to the current electrode should be ten times the maximum dimension of the earth system. Bureau of standards now nist developed.

Handle of the operating pipe. Fence if it is within 2 m from earth mat. 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. 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.

Equipment frame work and other non current carrying parts of the electrical equipments in the sub station. Earth mat is connected to the following in a substation. All extraneous metallic frame work not associated with equipment.