Analysis of Ground Fault Relay Coordination at The Jelok Hydroelectric Power Plant Using Electrical Transient Analyzer Program Yoakim Simamora, Agnes Irene Silitonga, Mega Silfia Dewy, Erita Astrid
Universitas Negeri Medan
Abstract
Power system protection refers to the measures and devices designed to protect components and equipment within the power system from disturbances and damage. This includes protection against abnormal conditions such as short circuits, overcurrent, and other disturbances that can threaten the safety of the system, equipment, and operators. The purpose of power system protection includes several important aspects, among others equipment Security, protecting electrical equipment such as generators, transformers, and lines from damage due to disturbances, such as short circuits or overloads. Ground fault relay is a protective device used to detect ground faults (leakage current) in electrical systems. When there is a leakage current flowing to the ground, this device will identify the difference between incoming and outgoing currents. If the difference exceeds the predetermined threshold, the relay will function to cut off the electrical flow, preventing equipment damage and reducing the risk of fire or electric shock. The renewal of the overcurrent relay and phase-to-ground fault relay settings in the protection system at hydroelectric power plants jelok is very necessary because there has been no update to the settings since hydroelectric power plants Jelok was established in 1935. Then the coordination between relays can be analyzed using the current versus time plot curve in the ETAP 12.6 program. The relay setting in this study is considered reliable because the curve lies within the safe limits, specifically to the right of the full load current and transformer inrush lines, and to the left of the damage curve line.
