@thesis{thesis,
		author={Soewono  Soetjipto and THAHAR  MUHAMMAD NOUVAL},
		title ={STUDI SISTEM PERLINDUNGAN PETIR DI GARDU INDUK 150 KV GANDUL DENGAN MENGGUNAKAN METODE BOLA BERGULIR},
		year={2017},
		url={http://156.67.221.169/848/},
		abstract={Lightning protection system on the substation is very important to protect the equipment on the substation area from direct lightning strikes. And if the lightning stroke was ignored it can caused a damage to electrical equipment on the substation area and causing large financial losses. Therefore, to avoid the direct strike on substation was required a shield wire to protect the equipment on the substation of the direct lightning strike, and to determine a places should be installed the shield wire can be used one method is the method of rolling rolling sphere. In this thesis will be evaluated the system of lightning protection (shield wire) on 150 kv substation gandul has been able to protect all the substation equipment from the lightning strike with a rolling sphere methods. And the results obtained in zone B zone D and zone F still have equipment that has not been protected by shield wire system that already exist. While in zone A, zone C, and Zone E the existing lightning protection system (Shieldwire) has been able to provide protection against lightning strikes.}
		}