DESIGN THE METHOD OF AUTOMATIC LOCALIZATION AND ISOLATION ON LOAD BREAK SWITCH (LBS) WITHOUT COMMUNICATION DUE TO SINGLE LINE TO GROUND FAULT IN SPINDLE DISTRIBUTION GRID

• Main Author: Subagja Manurung, Andre
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/63996
• Institution: Institut Teknologi Bandung

ABSTRACT Design the Method of Automatic Localization and Isolation on Load Break Switch (LBS) without Communication due to Single Line to Ground Fault in Spindle Distribution Grid Andre Subagja Manurung In spindle network distribution with medium voltage cable line, PLN has integrated GFD (ground fault detection) at every incoming middle-point. To be able to restore the feeder, PLN officers will receive a fault report, the officers is dispatched to search for fault locations, isolation process, which these processes can take 3.5 hours. In the case of a single line ground fault (SLGF), PLN will lose the customer trust and they need pay a fine to the customer. The solution to this problem is that automation needs to be done at the middle-point of feeder by localizing and isolating the SLGF, so that PLN officers can focus on returning power to the upstream and downstream feeder loads. Automatic localization and isolation of SLGF without communication by Upstream LBS is done by using the Current and Voltage Verification method, which based on the study result data. The zero-sequence current parameter is used to determine the possible location and fault resistance, where the voltage parameter ????????????????????/???????????????????? is used to verify the correct location and fault resistance detected by each middle-point. Automatic localization and isolation of SLGF without communication by Downstream LBS utilizes capacitive currents in determining trip time through TOC characteristics, so that the closest middle-point's LBS to the SLGF location will trip first, where the setting time for each middle-point (if LBS must act as Downtream) is 0.005, 0.007, 009, 0.011, 0.013, and 0.015 for GB2, GB3, GB4, GB5, GB6, and GB7, respectively. Keywords–spindle network, capacitive current, fault localization, automatic LBS isolation