PERANCANGAN SISTEM PENGAMAN BUSBAR 150 KV MENGGUNAKAN RELE DIFERENSIAL DI GARDU INDUK SANUR

Abstract

Sanur substation has an important role to fulfill electricity consumption in the Sanur
area and parts of the city of Denpasar. Bursbar is very important part of the performance of a
substation. failures that occur on the busbar can result in widespread blackouts that disrupt the
continuity of the flow of electric power. A sensitive, selective and fast busbar protection system
is needed to prevent widespread blackouts. This research is designed to design dual 150 kV
busbar protection using differential relays. The power flow and short circuit current in Sanur
substation in this study were analyzed using simulation of load flow and short circuit with
computer software. Current calculation as the basis for designing and setting differential relay
settings as busbar protection is carried out by the Merz price calculating current method, all
currents entering and leaving the secured equipment, compared to each other. The busbar
protection system using differential relays was successfully designed with a pick up current
setting of 0.88 A for busbar A and 1.046 A for busbar B, as well as breakpoints 6 A, slope1;
30%, slope2; 135%, and zero seconds working time for both relays the. The differential relay
designed is able to isolate busbar failures more sensitive, more selective, and faster with a
clearing time of 0.035 seconds compared to the existing condition protection system with a
clearing time of 1.185 seconds.