Substation Earth Mat Testing

Bureau of standards now nist developed.

Substation earth mat testing.

Earth mat in 110kv side of a 220 110 kv substation the fence equipment body tanks support structures towers structural steelworks water pipes etc. Earth mat is connected to the following in a substation. 1 identify a suitable reference earth connection in the substations e g. Handle of the operating pipe.

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. Equipment frame work and other non current carrying parts of the electrical equipments in the sub station. For a single 2 m long electrode this is not usually a problem with a remote test spike at 20 m. Earth mat design in 33 11 kv power substation live working substation.

Introduction to substation earthing grid. Testing procedure before installation of gratings lv rubber gloves must be worn at all times when test leads are connected to the substation earths. 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. Mat ansi astm d178 or equal while operating the test set.

The neutral point of such system through its own independent earth. 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. 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. However this may be impractical for a substation with a 100 m square earth mat.

A current electrode is required approximately 1 km from the site. Ner earth or obvious earth bar in switch room. Frank wenner of the u s.