Interference Analysis of Postpaid kWh Meters According to Standard Operational Procedures at PT. PLN Ulp Helvetia Medan Indonesia: Analisis Gangguan Pada kWh Meter Pasca Bayar Menurut Standar Operasional Prosedur di PT. PLN Ulp Helvetia Medan Indonesia. Prev. J. Multidiscip. Sci. 2023;2(1):49-56. doi:10.58330/prevenire.v2i1.93