1.What Is Plate Earthing?

1.What is PLATE EARTHING?

Ans.   For good earth in electric substation, plate earthing is used.

Plate earthing : In plate earthing, the looping earth wire is bolted effectively with the earth plate made up of copper size 60 cm x 60 cm x 3.18 mm (2’ x 2’ x 1/4”) and embedded 3 meters in ground. Copper plates are found to be most effective earth electrodes and are not affected by the soil moisture i.e., these do not get rusted. But on account of its high material cost, galvanized iron platesare preferred and usually used for normal work.

In case the soil resistivity is high, the plate should be placed vertically in ground at a higher depth. A line diagram showing the plate earthing system is shown in Fig.

‘Ans. For good earth in electric substation, plate earthing is used.

Plate earthing : In plate earthing, the looping earth wire is bolted effectively with the earth plate made up of copper size 60 cm x 60 cm x 3.18 mm (2’ x 2’ x 1/4”) and embedded 3 meters in ground. Copper plates are found to be most effective earth electrodes and are not affected by the soil moisture i.e., these do not get rusted. But on account of its high material cost, galvanized iron platesare preferred and usually used for normal work.

In case the soil resistivity is high, the plate should be placed vertically in ground at a higher depth. A line diagram showing the plate earthing system is shown in Fig.
The plate is kept with its face vertical and is so arranged that it is embedded in an alternate layer of coke and salt for a minimum thickness of about 15 cm. The coke salt decreases the earth resistance. It should be remembered that the nuts and bolts must be of copper for copper plate and should be of G.I. for G.I. plates. Usually, the earth wire is drawn through a G.I. pipe fitted with a tunnel on the top through which salty water is poured in the pit of earth plate from time to time in summer season when the moisture of the soil will decrease to a larger extent which will increase the earth resistance.
The conductivity, i.e., earthing efficiency, increases with the increase of plate area and depth of embedding. Its only disadvantage is that discontinuity of earth wire and plate below the earth cannot be observed physically; hence is misleading and sometime results in heavy loss in case of any fault. 

Plate earthing : In plate earthing, the looping earth wire is bolted effectively with the earth plate made up of copper size 60 cm x 60 cm x 3.18 mm (2’ x 2’ x 1/4”) and embedded 3 meters in ground. Copper plates are found to be most effective earth electrodes and are not affected by the soil moisture i.e., these do not get rusted. But on account of its high material cost, galvanized iron platesare preferred and usually used for normal work.

In case the soil resistivity is high, the plate should be placed vertically in ground at a higher depth. A line diagram showing the plate earthing system is shown in Fig.

‘Ans. For good earth in electric substation, plate earthing is used.

Plate earthing : In plate earthing, the looping earth wire is bolted effectively with the earth plate made up of copper size 60 cm x 60 cm x 3.18 mm (2’ x 2’ x 1/4”) and embedded 3 meters in ground. Copper plates are found to be most effective earth electrodes and are not affected by the soil moisture i.e., these do not get rusted. But on account of its high material cost, galvanized iron platesare preferred and usually used for normal work.

In case the soil resistivity is high, the plate should be placed vertically in ground at a higher depth. A line diagram showing the plate earthing system is shown in Fig.
The plate is kept with its face vertical and is so arranged that it is embedded in an alternate layer of coke and salt for a minimum thickness of about 15 cm. The coke salt decreases the earth resistance. It should be remembered that the nuts and bolts must be of copper for copper plate and should be of G.I. for G.I. plates. Usually, the earth wire is drawn through a G.I. pipe fitted with a tunnel on the top through which salty water is poured in the pit of earth plate from time to time in summer season when the moisture of the soil will decrease to a larger extent which will increase the earth resistance.
The conductivity, i.e., earthing efficiency, increases with the increase of plate area and depth of embedding. Its only disadvantage is that discontinuity of earth wire and plate below the earth cannot be observed physically; hence is misleading and sometime results in heavy loss in case of any fault.