Studi Penyetelan Relay Arus Lebih (OCR) Pada Gardu Induk Teluk Lembu Pekanbaru

Abstract

This study aimed to obtain the optimal setting and should be of 60 MVA at bay transformer protection system at the substation/switch yard Teluk Lembu Pekanbaru. This study uses observation, that determines which objects will be studied to evaluate the coordination of the relay in the transformer of 60 MVA substation Teluk Lembu Pekanbaru. With the data obtained as a diagram of the distribution network of the line (SUTM) substation Teluk Lembu Pekanbaru along with CB data, the transformers, relay specification OCR and resetting existing conditions relay, and additional data that support for this thesis as load data and daily etc. From the calculation results with existing data in the field is still in appropriate conditions (the difference is not too much), so it can be concluded that the overall arrangement of OCR in the field is still in good condition. OCR for relay settings in the feeder has about the same value at which the TMS for OCR each 0,2s in calculations and in the field to OCR, , but there relay settings no longer appropriate that the relay settings on the side of the entrance, where TMS = 0,37s in other words if there is a short circuit fault then the relay will take a long time to work. So setting relay OCR incoming side that is in the field must be set back.
Keyword : Setting Protection Relay, OCR (Over Current Relay)