Voltage drop is the loss of voltage caused by several factors. PLN sets the standard of voltage at +5% -10% of the line voltage. The Utari feeder experiences a voltage drop caused by the length of the network plus the amount of load that is concentrated at the end of a network. This study uses observation method or library research. The source of the data used is secondary data (which already exists) which is then simulated using the ETAP application by utilizing the Load Flow Analysis function so that the results of the power flow in the electrical system are obtained. Based on the results of the study, to increase the voltage by building an underbuild network. The construction of this underbuild network aims to cut the length of the Utari feeder which is then maneuvered into Gunung Madu Plantation feeder. The voltage which was originally 17.217kV to 18.968kV with a difference is 1.751kV, namely there is an increase in voltage of about 7.4% from before. With the breaking of the load, it can shorten length of the feeder, so that by reducing the length of the feeder, the inductive reactance of the line will decrease so that the shrinkage is smaller.

Generator Circuit Breaker (GCB) is a circuit breaker that connects electrical energy between the generator of a generator and the electrical network system. Circuit breaker is an electrical device that functions automatically to prevent damage to the electrical circuit due to ashort circuit,overload, andgrounding. faults. This research method was obtained through direct observation and reading the manual book of PT. PLN (Persero) UPK Sebalang unit 1 which is located at Lintas Sumatera Street Km. 22 Sebalang Hamlet, Tarahan Village, Katibung District, South Lampung Regency. The purpose of this study is to find out the results of the analysis of the performance testing of GCB unit 1 PLTU Sebalang both before and after maintenance. The results of the research and analysis of GCB unit 1 PLTU Sebalang changed after maintenance, so that the performance value of the simultaneous contact for the position open was 50%, theposition closed was 46%, the contact resistance for the R phase was 23.5%, the S phase resistance value was 38.7%, and the value of phase T resistance is 33.8%, as well as insulation resistance changes when theposition is open phase R1.4%, phase S is 1.2%, and phase T is 1.1%, for the close phase R 1.8%, phase S 1.1%, phase T 1.2%. This matter shows that the performance value in good condition.

The medium voltage network of bacan feeders was an air line power network and had a very high potential to experience disruptions impacted on customer outages. The bacan feeder network was divided into sections uisng breaker equipment (Recloser/LSBM) in order to narrow down the area of blackout when a disturbance occurs. The work function of the breaker equipment was not yet optimal, so it can have an impact on the length of time the customer goes out when there was a network disturbance. From the simulation of the existing feeder conditions, the ENS (Energy Not Supplied) results were really high and the duration of the shutdown was every long so we optimize the breaker equipment (LBSM) by resetting the sectionalizer and telesignaling SCADA (Supervisory Control And Data Acquisition) and RTU (Remote Terminal Unit) on LBSM that has not been intergrated with SCADA. Based on the results of the analysis, evaluation and simulation, after the optimization of the SCADA-based sectionalizer function had been applied to the LBSM equipment, the ENS value and the feeder shutdown duration function due to the disturbance of the bacan feeder network could be significantly reduced

Medium Voltage Air Line Conductor (SUTM) has a voltage of 20 kV. The SUTM network should have the criteria for electricity safety techniques, including minimum safety distances between the trees and the environment and the effectiveness of electricity distribution development. There are ten stages in the installation of the new SUTM 20 kV network. The results of the study concluded that the Conductor used in the planning of the 20 kV SUTM new network construction was AAACS - 150 mm2. The safe distance between the conductors and the conditions contained Billboards are 0.5 meters with a minimum height difference of ± 2.5 meters. Whereas the safe distance between the conductor and the tree is ± 0.5 meters, but the Medium Voltage Network Construction Standard for Electric Power must have a height difference of 2.5 meters. The distance between the conductor and billboards is 0.5 meters, which does not complete the standard instructions.