gardu distribusi transmisi gardu induk jtr proteksi jtm power operasi swithgear gis substation power station power system electricity subsatation trafo distribusi jaringan tegangan menengah gd gardu induk konvensional grid code sulawesi grid kode indonesia operasi stl operasi sistem suatu unit peralatan listrik subtation operations energy trasmisi circuit breaker menara isolator busbar relay lead generation
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