Study on the electrical equivalent circuit model of lightning fault cause in power grid system by Asman, Saidatul Habsah, Zainul Abidin, Aidil Azwin, Mohd Ngah, Nurul Ainatul Rahmah, Ab Aziz, Nur Fadilah, Ab. Kadir, Mohd Zainal, Ahmad Mustafa, Nur Badariah, Leong, Yeng Weng