Adanya gangguan pada penyaluran tenaga listrik akan menghambat aliran listrik bagi pelanggan maupun komponen proteksi pada jaringannya SUTMktipe radial, salah satunya relai proteksi yang bisa rusak akibat adanya gangguan. Gangguan yang terjadi berupa hubung singkat antar fasa di feeder percabangan (F1 dan F2) maupun feeder utama (F3). Dengan timbulnya permasalahan tersebut topik ini diangkat untuk memenuhi tugas akhir yaitu rancang simulator koordinasi proteksi arus lebih dengan 2 pengaman relai yaitu MK1000A dan P124. Pembuatan simulator ini belum ada sebelumnya di Laboraturium Sistem Distribusi Tenaga Listrik Politeknik Negeri Bandung. Agar proteksi jaringan tetap terjaga maka dilakukan koordinasi proteksi arus lebih agar saat gangguan teratasi. Ketika gangguan hubung singkat di titik F1 sisi hilir jaringan maka relai utama akan bekerja seketika saat gangguan hubung singkat 3 fasa dan saat gangguan 2 fasa relai bekerja dengan waktu tunda(0,4 s), namun saat gagal mengamankan akan di amankan oleh pengaman cadangan di feeder utama yaitu bekerja dengan waktu tunda (0,8 s). Pada gangguan di titik F2 sisi dekat hulu feeder cabang relai utama akan bekerja setika saat hubung singkatt 2 fasa ataupun 3 fasa, saat gagal mengamankan maka relai cadangan di feeder A bekerja dengan waktu tunda (0,8 s). Dan pada titik gangguan F3 maka yang akan mengamankan yaitu relai cadangan atau relai di feeder utama, saat gangguan hubung singkat 3 fasa bekerja seketika dan 2 fasa bekerja dengan waktu tunda (0,2 s). Kata kunci: Proteksi, gangguan, koordinasi, SUTM, konsfigurasi radial.

The presence of interference in the distribution of electricity will inhibit the flow of electricity for customers and protective components on the network of radial type SUTM, one of the protection relays that can be damaged due to interference. The disturbance occurs in the form of short circuit between phases in the branching feeder (F1 and F2) as well as the main feeder (F3). With the emergence of these problems the topic was appointed to fulfill the final task of designing the simulator of the coordination of over-current protection with 2 security relays namely MK1000A and P124. This simulator has not been made before in Laboratory of Electricity Distribution System Polytechnic State of Bandung.In order to keep the network protection is maintained then coordinated more current protection so that when the interruption is resolved. When the interconnected connecting noise is at the downstream F1 point of the network, the main relay will work instantaneously during 3 phase short circuit and when the 2 phase relay failure works with delay time, but when failed to secure it will be secured by the backup safeguard in the main feeder that is working with time cancel. At the disturbance at point F2 near the upstream of the main relay feeder branch will work when the 2 phase or 3 phase sing-act link, when it fails to secure the backup relay in feeder A works with time delay. And at the point of interference F3 then that will secure the backup relay or relay in the main feeder, when 3 phase short circuit short circuit works instantly and 2 phase work with time delay. Keywords: Protection, fault , coordination, SUTM, radial configuration.

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