1.what is surge
2.what is lightning
3.what is switching
4.difference between surge,lightning,switching used in
power system
4.definition of surgearrestor,lightningarrestor
5.adv and disadv of surgearrestor,lightningarrestor
6.uses and purpose of surgearrestorand lightning arrestor
7.block dia of surge arrestor
8.blockdiagram of lightning arrestor
9.operation and working of surge arrestor and lightning
arrestor
10.basic formula of surgearrestor and lightning arrestor
11.basic diagram of surge arrestor and lightning arrestor
Answer / senthilkumar.jaipur
technical question -powersystem and switchgearand protection
| Is This Answer Correct ? | 9 Yes | 3 No |
I find that underground strip-armoiured,4core,LT PVC cables in an earthed power distribution sytem are occasionly found in charred condition-with no trace of it except ash. Is this because of no proper earth connection/continuity (giving rising to high armour resistance)in the joint enroute or because of insufficient capability (again due to high armour resistance)of cable-armour to carry fault current or due to neglected /unprotected overloading of the cable or due to high armour currents caused by power thefts where only phase(s) are unauthorisely tapped & at the point of poer consumption earth terminal is established by burring underground a not so good earthing rod (or using an underground water pipe for the purpose)
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