Electrical Engineering ⇒ Topic : Methods of Neutral Earthing
Methods of Neutral Earthing
The following methods are employed to earth the neutral of the power system :
Solid earthing. usually confined to systems operating at voltage below 22 kV and above 33 kV.
Resistance earthing. usually employed for the system operating a't voltages between, 22.kV and 33 kV when the power source capacity exceeds 5000 kVA.
Reactance earthing. this system ensures satisfactory relaying partial grading- of the apparatus insulation, reduced interference to neighboring communication circuits as compared with that in solidly earthed system. Its main drawback is very high transient over voltages due to which this system is not in common use.
Arc suppression coil or Peterson coil earthing, usually confined to medium voltage overhead transmission lines which are connected to generating source through intervening power transformers.
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