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The single phase to ground fault on the 150 kV transmission line GIS Pesanggaran –
Nusa Dua Substation has a high fault impedance so that the distance relay as an
auxiliary safety device cannot detect the disturbance. Directional Ground Relay (DGR)
was chosen as an auxiliary protection relay to secure the system from single phase to
ground faults. Installation of auxiliary protection relays requires planning and relay
setting steps to obtain Iset, TMS and trip time. The calculations that have been carried
out get the results of DGR setting with a pickup current range of 0.0522 – 0.0722 A.
DGR will work after 2.297 seconds if the differential relay as the main protection relay
does not work or fails and the distance relay as a backup protection does not succeed in
securing a single phase fault to ground as well.
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