Setting Relai Differensial Pada Transformator Daya 150kv Gardu Induk Pondok Indah Menggunakan Protocol Communications Modbus

Abstract

Transformers in power systems require different types of protection.
This protection is provided by various types of relays, both
electromagnetic and static. In general, transformer protection serves
to protect the transformer in the event of a disturbance, so that the
transformer can be avoided from damage. The relay that will be used
to protect the transformer is a differential relay. This relay works
when there is a difference in the current of the Current Transformer
[CT] on the primary and secondary sides. If the fault occurs outside
the protection zone, the relay will not work. The method used in this
research is R&D (Research and Development), namely research and
development methods, research and development methods are
research methods used to produce certain products, and test the
effectiveness of these products. An evaluation of the differential
relay setting on a 150kV power transformer has been carried out at
the Pondok Indah Substation using the Modbus Communications
Protocol, where the settings in the field and from the results of
calculations using the Micom 632 differential relay are obtained: for
the calculation results of Idiff = 0.39 and Idiff max = 8.07 while the
actual setting in the field is Idiff = 0.3 and Idiff max = 8. The
difference in value between the actual setting and the calculation
results is Idiff by 30%, and Idiff max 0.87% is still within the
allowed interval . Setting using the modbus communications
protocol has advantages, including reducing wiring, making
troubleshooting or interference easier, reducing the possibility of
human-error errors in the configuration process, and making it easy
to make changes.