UJI BANDING DATA COMMISSIONING DENGAN DATA MAJOR OVERHAUL DIFFERENTIAL RELAY PADA GENERATOR 3 FASA 11KV/35MW UNIT 3 DI PT.PJB UNIT PEMBANGKIT BRANTAS UNIT PLTA SUTAMI

MERANI NOVIANA, Ir. Y. Wahyo Setiyono, M. T.

2017 | Tugas Akhir | D3 TEKNIK ELEKTRO SV

Generator sinkron memerlukan adanya sistem proteksi khususnya dalam proses energi listrik yang diperoleh dari proses induksi elektromagnetik yang terjadi pada kumparan stator dan rotornya. Pada kumparan stator diperlukan sistem proteksi berupa relay, salah satu relay proteksi pada kumparan stator ialah Differential Relay Tipe CBR2D-BT1. Differential Relay Tipe CBR2D-BT1 merupakan proteksi yang digunakan pada generator khususnya terhadap kerusakan internal kumparan stator. Apabila terjadi gangguan di dalam kumparan stator seperti hubung singkat, maka timbul selisih antara arus pada sisi primer dan arus pada sisi sekunder dan selisih arus inilah yang akan mengoperasikan relay. Besar arus selisih (Id) direpresentasikan oleh besar arus gangguan yang terjadi, arus gangguan menyebabkan arus diferensial (arus selisih Id) antara I1 dan I2. Berdasarkan pengujian arus selisih (Id) Differential Relay Tipe CBR2D-BT1 yang dibandingkan dengan data commissioning, terdapat perubahan pada I1, I2, dan Id, namun dalam perubahan tersebut masih dalam batas normal. Dalam perubahan tersebut maka dapat digambarkan ke dalam kurva karakteristik arus kerja Differential Relay.

Synchronous generators require any protection system, especially in the electrical energy obtained from the electromagnetic induction process that occurs in the stator and rotor coils. In the stator coil is required in the form of relay protection systems, one relay protection in the stator coil is Differential Relay Type CBR2D-BT1. Differential Relay Type CBR2D-BT1 is a protection used in the generator, especially against internal damage to the stator coil. In the event of disruption in the stator coils such as short circuit, then the resulting difference between the current on the primary side and secondary side and the current in the current difference is what will operate the relay. Big difference current (Id) are represented by large fault currents occur, the fault current causes differential currents (current difference Id) between I1 and I2. Based on the difference between current testing (Id) Differential Relay Type CBR2D-BT1 mode compared to the commissioning of data, there is a change in I1, I2, and Id, but the changes are still within normal limits. In such changes, it can be drawn into the work flow characteristic curve Differential Relay.

Kata Kunci : Differential Relay, Testing, Work Flow Characteristic Curve.