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Testing procedure before installation of gratings lv rubber gloves must be worn at all times when test leads are connected to the substation earths.
Substation earth mat testing. Earth mat design in 33 11 kv power substation live working substation. Frank wenner of the u s. 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 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.
Equipment frame work and other non current carrying parts of the electrical equipments in the sub station. 1 identify a suitable reference earth connection in the substations e g. 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.
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. Mat ansi astm d178 or equal while operating the test set. Ideally the distance to the current electrode should be ten times the maximum dimension of the earth system. All extraneous metallic frame work not associated with equipment.
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. Introduction to substation earthing grid. A current electrode is required approximately 1 km from the site. Ner earth or obvious earth bar in switch room.
Bureau of standards now nist developed. The neutral point of such system through its own independent earth. Fence if it is within 2 m from earth mat.
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