Analysis of Arresters in The 20Kv Distribution Network at PT.PLN (Persero) ULP Bukittinggi

Abstract

On medium voltage overhead lines (SUTM), short circuit faults often occur due to lightning strikes and overload faults.A safety or protective device is a device that functions to protect or secure an electric power distribution system by limiting the overvoltage or overcurrent flowing in the system, and channeling it to the ground. There are 2 methods of placing Lightning Arrester (LA) and Fuse Cut Out (FCO) as protection in distribution substations, namely placing Lightning Arrester (LA) before Fuse Cut Out (FCO) and placing Lightning Arrester after Fuse Cut Out (FCO).Knowing the differences in the construction of installing Lightning Arrester and Fuse Cut Out, and making a comparison with the application of ETAP simulation to get a conclusion about which construction is suitable for use. For distribution substation Portal Lightning Arrester After Fuse Cut Outfor the PLN voltage value will continue to flow, the output will be clean up to the last bus even if there is a disturbance in the increase in voltage such as a lightning strike, then the lightning strike will go directly to the ground or groaning so the disturbance will be directly held by the Grounding. For One Line Diagram of Lightning Arrester Portal Distribution Substation After Fuse Cut Outfor the PLN voltage value will continue to flow, the output will be clean up to the last bus even if there is a disturbance in the increase in voltage such as a lightning strike, then the lightning strike will go directly to the ground or groaning so the disturbance will be directly held by the Grounding.Characteristics of Lightning Arrester rated voltage 24 kV, discharge current, 87 kV, the protective factor contained in the distribution channel is 20% greater than the TID, so this LA has provided a good protective factor.